subject:(structural optimization)

Georgia Tech

1. Noevere, August T. Rapid determination of mass and stiffness distribution on primary skin-stiffener structures.

Degree: PhD, Aerospace Engineering, 2016, Georgia Tech

► In modern conceptual/preliminary design of aerospace vehicles it is common for a large number of concepts and configurations to be rapidly explored. For each configuration,… (more)

Subjects/Keywords: Structural optimization; Stiffened panel optimization; Conceptual design

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APA (6^th Edition):

Noevere, A. T. (2016). Rapid determination of mass and stiffness distribution on primary skin-stiffener structures. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/55638

Chicago Manual of Style (16^th Edition):

Noevere, August T. “Rapid determination of mass and stiffness distribution on primary skin-stiffener structures.” 2016. Doctoral Dissertation, Georgia Tech. Accessed December 14, 2019. http://hdl.handle.net/1853/55638.

MLA Handbook (7^th Edition):

Noevere, August T. “Rapid determination of mass and stiffness distribution on primary skin-stiffener structures.” 2016. Web. 14 Dec 2019.

Vancouver:

Noevere AT. Rapid determination of mass and stiffness distribution on primary skin-stiffener structures. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/1853/55638.

Council of Science Editors:

Noevere AT. Rapid determination of mass and stiffness distribution on primary skin-stiffener structures. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/55638

Montana State University

2. Condori Quispe, Hugo Orlando. Implementation of null steering algorithms in a compact analog array.

Degree: College of Engineering, 2014, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/3344

► In this thesis, the implementation of null steering algorithms in a compact analog array is demonstrated and validated. The performance of the null steering algorithms… (more)

Subjects/Keywords: Algorithms.; Antenna arrays.; Mathematical optimization.; Structural optimization.

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APA (6^th Edition):

Condori Quispe, H. O. (2014). Implementation of null steering algorithms in a compact analog array. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/3344

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Condori Quispe, Hugo Orlando. “Implementation of null steering algorithms in a compact analog array.” 2014. Thesis, Montana State University. Accessed December 14, 2019. https://scholarworks.montana.edu/xmlui/handle/1/3344.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Condori Quispe, Hugo Orlando. “Implementation of null steering algorithms in a compact analog array.” 2014. Web. 14 Dec 2019.

Vancouver:

Condori Quispe HO. Implementation of null steering algorithms in a compact analog array. [Internet] [Thesis]. Montana State University; 2014. [cited 2019 Dec 14]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/3344.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Condori Quispe HO. Implementation of null steering algorithms in a compact analog array. [Thesis]. Montana State University; 2014. Available from: https://scholarworks.montana.edu/xmlui/handle/1/3344

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Ontario Institute of Technology

3. Cook, Adam George Mount. Front underride protection devices: design methodology for heavy vehicle crashworthiness.

Degree: 2016, University of Ontario Institute of Technology

URL: http://hdl.handle.net/10155/644

► North American Heavy Vehicles contribute to a third of all road fatalities in Canada. Head on collisions are one of the most severe, as the… (more)

▼ North American Heavy Vehicles contribute to a third of all road fatalities in Canada. Head on collisions are one of the most severe, as the mismatch of vehicle weight and sizing intensifies when a passenger vehicle is impacted. To improve crash safety, Front Underride Protection Devices (FUPDs) are a proposed solution to establishing a compatible collision between a passenger vehicle and a heavy vehicle. The European Union is among numerous administrations to regulate FUPDs, yet FUPDs are nonexistent in North America. Current regulations conform to European Cab-over Engine Tractors designs. Implementation of current regulations in North American conflicts with the widely driven Conventional Style Tractor due to the different design space for a FUPDs. This study builds on developing regulations for North America, and establishes a design methodology to developing and optimizing FUPDs for the Conventional Style Tractor enlightening the crashworthy importance of front underride protection devices to improving road safety. Advanced two stage optimization methodology was outlined to ensure industry targets are embedded with in the design to develop lightweight and cost effective devices. Recommendations for the modifications of the ECE R93 for Conventional Style Tractor are outlined; P1 load magnitudes requirements for FUPD stiffness should be increased from the regulated 80 kN to 160 kN to improve small overlap collisions. Regulated geometric parameters were recommended to have a minimal frontal contact height of 240mm, with ground clearance set between 350mm to 400mm. Geometric configurations were outlined and restricted to conform to the aerodynamic curvatures of the tractors bumper. After validation of the National Crash Analysis Center (NCAC) Toyota Yaris finite element analysis (FEA) model for side impact, the addition of a FUPD enhanced the survivability of passenger vehicle. The work achieved in enhancing the design methodology for industrial implementation and outlining regulations for North America. Advisors/Committee Members: El-Gindy, Moustafa.

Subjects/Keywords: Crashworthiness; FEA; Design; Structural; Optimization

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APA (6^th Edition):

Cook, A. G. M. (2016). Front underride protection devices: design methodology for heavy vehicle crashworthiness. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/644

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cook, Adam George Mount. “Front underride protection devices: design methodology for heavy vehicle crashworthiness.” 2016. Thesis, University of Ontario Institute of Technology. Accessed December 14, 2019. http://hdl.handle.net/10155/644.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cook, Adam George Mount. “Front underride protection devices: design methodology for heavy vehicle crashworthiness.” 2016. Web. 14 Dec 2019.

Vancouver:

Cook AGM. Front underride protection devices: design methodology for heavy vehicle crashworthiness. [Internet] [Thesis]. University of Ontario Institute of Technology; 2016. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10155/644.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cook AGM. Front underride protection devices: design methodology for heavy vehicle crashworthiness. [Thesis]. University of Ontario Institute of Technology; 2016. Available from: http://hdl.handle.net/10155/644

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Victoria

4. Sedaghati, Ramin. Investigations in structural optimization of nonlinear problems using the finite element method.

Degree: Department of Mechanical Engineering, 2018, University of Victoria

URL: https://dspace.library.uvic.ca//handle/1828/9120

► Structural optimization is an important field in engineering with a strong foundation on continuum mechanics, structural finite element analysis, computational techniques and optimization methods. Research… (more)

Subjects/Keywords: Structural optimization; Nonlinear functional analysis

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APA (6^th Edition):

Sedaghati, R. (2018). Investigations in structural optimization of nonlinear problems using the finite element method. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/9120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sedaghati, Ramin. “Investigations in structural optimization of nonlinear problems using the finite element method.” 2018. Thesis, University of Victoria. Accessed December 14, 2019. https://dspace.library.uvic.ca//handle/1828/9120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sedaghati, Ramin. “Investigations in structural optimization of nonlinear problems using the finite element method.” 2018. Web. 14 Dec 2019.

Vancouver:

Sedaghati R. Investigations in structural optimization of nonlinear problems using the finite element method. [Internet] [Thesis]. University of Victoria; 2018. [cited 2019 Dec 14]. Available from: https://dspace.library.uvic.ca//handle/1828/9120.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sedaghati R. Investigations in structural optimization of nonlinear problems using the finite element method. [Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/9120

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

5. Perez Cordoba, Xavier. Life-Cycle Cost Optimization For Foundation Engineering .

Degree: 2013, Cornell University

URL: http://hdl.handle.net/1813/34381

► The use of reliability-based design (RBD) in foundation engineering offers several advantages over traditional methods. Uncertainties in the load and capacity terms of the design… (more)

▼ The use of reliability-based design (RBD) in foundation engineering offers several advantages over traditional methods. Uncertainties in the load and capacity terms of the design equations can be evaluated rationally using probability theory, and the resultant probability of failure is a comprehensible measure of risk for non-technical people. However, there are a few drawbacks that have not been addressed effectively so far. For example, it is necessary to select target safety levels, typically from the reliability implied in traditional design methods. Also, the resulting reliability is a nominal value that can be significantly different from the true reliability derived from observed failure rates. This issue is rarely mentioned in the literature, but it affects the utility of probability as a communication tool. In addition, costs are not considered explicitly in the design process, and calculations can be excessively complex and timeconsuming for simple projects. A new framework to determine optimum foundation designs that result in minimum life-cycle costs is presented herein. The traditional approach for design optimization is to minimize an objective function, such as the sum of initial costs and expected cost of failure. Existing optimization methods require a number of initial assumptions and use nominal probabilities of failure, leading to inaccurate results. In the proposed framework, the true probability of failure is estimated using Monte Carlo simulation (MCS) or the first order reliability method (FORM). This process considers the variability of input parameters and the probability of "human errors". Although optimum design parameters can be obtained with the proposed framework, it would not be used in practice often, because it requires knowledge of reliability methods. A simplified approach is necessary to avoid complex calculations and facilitate its widespread use in ordinary projects. Therefore, a simplified method for approximate economic optimization is proposed. In an effort to close the gap between research and practice in foundation engineering, all the calculations shown herein can be reproduced in a simple spreadsheet with nonlinear optimization capabilities. Advisors/Committee Members: Grigoriu, Mircea Dan (committeeMember), Stewart, Harry Eaton (committeeMember).

Subjects/Keywords: foundation engineerining; structural optimization; reliability

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APA (6^th Edition):

Perez Cordoba, X. (2013). Life-Cycle Cost Optimization For Foundation Engineering . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/34381

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Perez Cordoba, Xavier. “Life-Cycle Cost Optimization For Foundation Engineering .” 2013. Thesis, Cornell University. Accessed December 14, 2019. http://hdl.handle.net/1813/34381.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Perez Cordoba, Xavier. “Life-Cycle Cost Optimization For Foundation Engineering .” 2013. Web. 14 Dec 2019.

Vancouver:

Perez Cordoba X. Life-Cycle Cost Optimization For Foundation Engineering . [Internet] [Thesis]. Cornell University; 2013. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/1813/34381.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Perez Cordoba X. Life-Cycle Cost Optimization For Foundation Engineering . [Thesis]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/34381

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Muller, Theodorus Ernst. A comparison of structural optimization techniques with extension towards multi-objective problems.

Degree: MEng, Civil Engineering, 2017, Stellenbosch University

URL: http://hdl.handle.net/10019.1/102719

►

ENGLISH ABSTRACT: Structural optimization is becoming an integral part of the modern structural design process in the search to yield more economical structures. The optimization… (more)

▼

ENGLISH ABSTRACT: Structural optimization is becoming an integral part of the modern structural design process in the search to yield more economical structures. The optimization of structures is typically performed with the objective to minimize weight or displacement primarily for cost reasons. Normally only one objective is considered, but methods enabling the consideration of multiple objectives have been developed. With respect to truss and frame structures, there are three well-known aspects which can be considered during the optimization process, namely, member sizing, shape and topology. These aspects refer to the size of the structure's members, the internal member configuration and its nodal positioning respectively. During the optimization, these aspects can be considered individually, simultaneously or sequentially, although typically only member size is considered due to its simplicity. This study aims to quantify the weight reduction in the resulting truss structure by applying a more complex optimization approach such as considering the three aspects simultaneously. Furthermore, this study also aims to determine whether or not a meaningful weight reduction can be achieved by adjusting the prescribed deflection limit of a frame structure whose maximum deflection can be regarded as non-critical, for example a rural warehouse. These aims are achieved by researching both general and structural optimization as well as available algorithms for successfully optimizing a structure. Software is developed to find solutions to both single- and multi-objective optimization problems. The software is used to optimize various truss problems found in literature by considering different combinations of the aforementioned structural aspects. The software is also used to optimize a selection of frame structures in a multi-objective It is concluded that a 22% more economical solution can be found by considering the three aspects simultaneously as opposed to considering only member size. From the frame structures considered in this study, it is concluded that the majority of the structure's weight can be reduced before the deflection limit is reached. Therefore, an increase in the displacement limit is not required.

AFRIKAANSE OPSOMMING: Strukturele optimering vorm 'n belangrike deel van die moderne struktuurontwerp proses om ten einde meer ekonomiese strukture te verkry. Strukture word tipies geoptimeer met die doel om die betrokke struktuur se gewig of verplasing te minimeer. Alhoewel metodes ontwikkel is vir die oorweging van meer as een doel, word normaalweg slegs een oorweeg. Ten opsigte van vakwerk en raam strukture is daar drie aspekte wat oorweeg kan word tydens die optimeringsproses, naamlik elementgrootte, vorm en topologie. Hierdie aspekte verwys respektiewelik na die grootte van elemente, die interne element konfigurasie en die posisionering van knooppunte. Tydens die optimeringsproses kan hierdie aspekte individueel, gelyktydig of agtereenvolgend oorweeg word, alhoewel meestal slegs die…

Advisors/Committee Members: Van der Klashorst, Etienne, Van Rooyen, G. C., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..

Subjects/Keywords: Truss structures; UCTD; Structural optimization; Genetic algorithms; Combinatorial optimization; Structural frames

11 more images…

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APA (6^th Edition):

Muller, T. E. (2017). A comparison of structural optimization techniques with extension towards multi-objective problems. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/102719

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Muller, Theodorus Ernst. “A comparison of structural optimization techniques with extension towards multi-objective problems.” 2017. Thesis, Stellenbosch University. Accessed December 14, 2019. http://hdl.handle.net/10019.1/102719.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Muller, Theodorus Ernst. “A comparison of structural optimization techniques with extension towards multi-objective problems.” 2017. Web. 14 Dec 2019.

Vancouver:

Muller TE. A comparison of structural optimization techniques with extension towards multi-objective problems. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10019.1/102719.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Muller TE. A comparison of structural optimization techniques with extension towards multi-objective problems. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/102719

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

7. Liu, Qiang. EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs.

Degree: PhD, Engineering Science and Mechanics, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/49665

► A global/local framework for multidisciplinary optimization of generalized aircraft wing structure has been developed. The concept of curvilinear stiffening members (spars, ribs and stiffeners) has… (more)

▼ A global/local framework for multidisciplinary optimization of generalized aircraft wing structure has been developed. The concept of curvilinear stiffening members (spars, ribs and stiffeners) has been applied in the optimization of a wing structure. A global wing optimization framework EBF3WingOpt, which integrates the static aeroelastic, flutter and buckling analysis, has been implemented for exploiting the optimal design at the wing level. The wing internal structure is optimized using curvilinear spars and ribs (SpaRibs). A two-step optimization approach, which consists of topology optimization with shape design variables and size optimization with thickness design variables, is implemented in EBF3WingOpt. A local panel optimization EBF3PanelOpt, which includes stress and buckling evaluation criteria, is performed to optimize the local panels bordered by spars and ribs for further structural weight saving. The local panel model is extracted from the global finite element model. The boundary conditions are defined on the edges of local panels using the displacement fields obtained from the global model analysis. The local panels are optimized to satisfy stress and buckling constraints. Stiffened panel with curvilinear stiffeners is implemented in EBF3PanelOpt to improve the buckling resistance of the local panels. The optimization of stiffened panels has been studied and integrated in the local panel optimization. EBF3WingOpt has been applied for the optimization of the wing structure of the Boeing N+2 supersonic transport wing and NASA common research model (CRM). The optimization results have shown the advantage of curvilinear spars and ribs concept. The local panel optimization EBF3PanelOpt is performed for the NASA CRM wing. The global-local optimization framework EBF3GLWingOpt, which incorporates global wing optimization module EBF3WingOpt and local panel optimization module EBF3PanelOpt, is developed using MATLAB and Python programming to integrate several commercial software: MSC.PATRAN for pre and post processing, MSC.NASTRAN for finite element analysis. An approximate optimization method is developed for the stiffened panel optimization so as to reduce the computational cost. The integrated global-local optimization approach has been applied to subsonic NASA common research model (CRM) wing which proves the methodology's application scaling with medium fidelity FEM analysis. Both the global wing design variables and local panel design variables are optimized to minimize the wing weight at an acceptable computational cost. Advisors/Committee Members: Kapania, Rakesh K. (committeechair), Hajj, Muhammad R. (committee member), Cramer, Mark S. (committee member), Case, Scott W. (committee member), Patil, Mayuresh J. (committee member).

Subjects/Keywords: Structural Optimization; Global-local Optimization; Wing Optimization; Multidisciplinary Design Optimization; SpaRibs; Stiffened Panel Optimization

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APA (6^th Edition):

Liu, Q. (2014). EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/49665

Chicago Manual of Style (16^th Edition):

Liu, Qiang. “EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs.” 2014. Doctoral Dissertation, Virginia Tech. Accessed December 14, 2019. http://hdl.handle.net/10919/49665.

MLA Handbook (7^th Edition):

Liu, Qiang. “EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs.” 2014. Web. 14 Dec 2019.

Vancouver:

Liu Q. EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10919/49665.

Council of Science Editors:

Liu Q. EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/49665

Carnegie Mellon University

8. Ulu, Erva. Enhancing the Structural Performance of Additively Manufactured Objects.

Degree: 2018, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/1188

► The ability to accurately quantify the performance an additively manufactured (AM) product is important for a widespread industry adoption of AM as the design is… (more)

Subjects/Keywords: additive manufacturing; computational design; fabrication; shape optimization; structural optimization; topology optimization

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APA (6^th Edition):

Ulu, E. (2018). Enhancing the Structural Performance of Additively Manufactured Objects. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/1188

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ulu, Erva. “Enhancing the Structural Performance of Additively Manufactured Objects.” 2018. Thesis, Carnegie Mellon University. Accessed December 14, 2019. http://repository.cmu.edu/dissertations/1188.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ulu, Erva. “Enhancing the Structural Performance of Additively Manufactured Objects.” 2018. Web. 14 Dec 2019.

Vancouver:

Ulu E. Enhancing the Structural Performance of Additively Manufactured Objects. [Internet] [Thesis]. Carnegie Mellon University; 2018. [cited 2019 Dec 14]. Available from: http://repository.cmu.edu/dissertations/1188.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ulu E. Enhancing the Structural Performance of Additively Manufactured Objects. [Thesis]. Carnegie Mellon University; 2018. Available from: http://repository.cmu.edu/dissertations/1188

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

9. Shin, Hyun. Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices.

Degree: PhD, Civil Engineering, 2010, Virginia Tech

URL: http://hdl.handle.net/10919/40399

► Seismic designs of building structures are currently made based on the design criterion of life-safety and this requires that the structures do not collapse to… (more)

▼ Seismic designs of building structures are currently made based on the design criterion of life-safety and this requires that the structures do not collapse to compromise safety of people in the structure, but they can be designed to experience some damage. However, this design approach has allowed large economic losses primarily due to the damage to the nonstructural components at relatively moderate levels of seismic intensities. This led to a new thinking about design approach called performance-based design approach that satisfies the life-safety objective at the same time, reduces the economic loss to an acceptable level. The performance-based design approaches are multi-level design that addresses several different levels of structural performances under different levels of seismic intensities. In this study, we have investigated the use of energy dissipating damping devices to achieve the performance of a building structure in a desirable manner over all levels of seismic intensity. Since the initial motivation of performance-based design was reducing economic loss, the life-cycle cost-based optimization is considered in this study to obtain the optimal designs with different damping devices. For the optimal design, three types of devices are used in this study: fluid viscous dampers, solid visco-elastic dampers, and yielding metallic dampers. The combinations of two different types of dampers are also examined in this study. The genetic algorithm (GA) approach is adopted as an optimizer that searches for the optimal solution in an iterative manner. Numerical results from the application of the optimal design to the selected model building are presented to demonstrate the iii applicability of the developed approach and to estimate the effectiveness of the obtained optimal design with each device. It is shown in the results that the optimal design with each individual damping devices or the combination of two different types of damping devices are very effective in reducing the expected failure cost as well as the displacement response quantities and fragilities. The results also show that the optimal designs focus relatively more on reducing economic losses for the lower but more frequent excitation intensities as these intensities contribute most to the failure costs. Advisors/Committee Members: Roberts-Wollmann, Carin L. (committee member), Kapania, Rabesh K. (committee member), Charney, Finley A. (committee member), Plaut, Raymond H. (committeecochair), Singh, Mahendra P. (committeecochair).

Subjects/Keywords: Life-Cycle Cost; Structural Optimization; Passive Device

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APA (6^th Edition):

Shin, H. (2010). Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/40399

Chicago Manual of Style (16^th Edition):

Shin, Hyun. “Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices.” 2010. Doctoral Dissertation, Virginia Tech. Accessed December 14, 2019. http://hdl.handle.net/10919/40399.

MLA Handbook (7^th Edition):

Shin, Hyun. “Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices.” 2010. Web. 14 Dec 2019.

Vancouver:

Shin H. Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices. [Internet] [Doctoral dissertation]. Virginia Tech; 2010. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10919/40399.

Council of Science Editors:

Shin H. Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices. [Doctoral Dissertation]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/40399

Delft University of Technology

10. Winklaar, M. Optimization of the structural grid tessellation for multi curved surface :.

Degree: 2012, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:9e3f83f0-1f87-4c1a-8b2b-142d29020a7d

► "Optimization of the structural grid tessellation for multi curved surface" is the graduation thesis that research and develop a design tool that generated different tessellation… (more)

Subjects/Keywords: Tessellation Generator; Dynamic Relaxation; Structural Optimization

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APA (6^th Edition):

Winklaar, M. (2012). Optimization of the structural grid tessellation for multi curved surface :. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9e3f83f0-1f87-4c1a-8b2b-142d29020a7d

Chicago Manual of Style (16^th Edition):

Winklaar, M. “Optimization of the structural grid tessellation for multi curved surface :.” 2012. Masters Thesis, Delft University of Technology. Accessed December 14, 2019. http://resolver.tudelft.nl/uuid:9e3f83f0-1f87-4c1a-8b2b-142d29020a7d.

MLA Handbook (7^th Edition):

Winklaar, M. “Optimization of the structural grid tessellation for multi curved surface :.” 2012. Web. 14 Dec 2019.

Vancouver:

Winklaar M. Optimization of the structural grid tessellation for multi curved surface :. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2019 Dec 14]. Available from: http://resolver.tudelft.nl/uuid:9e3f83f0-1f87-4c1a-8b2b-142d29020a7d.

Council of Science Editors:

Winklaar M. Optimization of the structural grid tessellation for multi curved surface :. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:9e3f83f0-1f87-4c1a-8b2b-142d29020a7d

11. Fuerle, Fabian. Structural optimization in engineering design with a focus on process automation.

Degree: PhD, 2010, Swansea University

URL: https://cronfa.swan.ac.uk/Record/cronfa42567 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678682

► The present work is concerned with the advancement of the knowledge of structural optimization in engineering design while focusing on efficient and easy to use… (more)

Subjects/Keywords: 629.8; Structural optimization; Process control; Engineering design

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APA (6^th Edition):

Fuerle, F. (2010). Structural optimization in engineering design with a focus on process automation. (Doctoral Dissertation). Swansea University. Retrieved from https://cronfa.swan.ac.uk/Record/cronfa42567 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678682

Chicago Manual of Style (16^th Edition):

Fuerle, Fabian. “Structural optimization in engineering design with a focus on process automation.” 2010. Doctoral Dissertation, Swansea University. Accessed December 14, 2019. https://cronfa.swan.ac.uk/Record/cronfa42567 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678682.

MLA Handbook (7^th Edition):

Fuerle, Fabian. “Structural optimization in engineering design with a focus on process automation.” 2010. Web. 14 Dec 2019.

Vancouver:

Fuerle F. Structural optimization in engineering design with a focus on process automation. [Internet] [Doctoral dissertation]. Swansea University; 2010. [cited 2019 Dec 14]. Available from: https://cronfa.swan.ac.uk/Record/cronfa42567 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678682.

Council of Science Editors:

Fuerle F. Structural optimization in engineering design with a focus on process automation. [Doctoral Dissertation]. Swansea University; 2010. Available from: https://cronfa.swan.ac.uk/Record/cronfa42567 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678682

University of Illinois – Urbana-Champaign

12. Vaught, Louis Oren. A preliminary formalization of scale in topology optimization.

Degree: MS, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99425

► Topology Optimization often enforces a minimum feature size, also known as a scale, to avoid instability and inaccuracy in the optimized result. This is usually… (more)

Subjects/Keywords: Topology; Optimization; Structural; Scale; Scale-space

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APA (6^th Edition):

Vaught, L. O. (2017). A preliminary formalization of scale in topology optimization. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99425

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vaught, Louis Oren. “A preliminary formalization of scale in topology optimization.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed December 14, 2019. http://hdl.handle.net/2142/99425.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vaught, Louis Oren. “A preliminary formalization of scale in topology optimization.” 2017. Web. 14 Dec 2019.

Vancouver:

Vaught LO. A preliminary formalization of scale in topology optimization. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/2142/99425.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vaught LO. A preliminary formalization of scale in topology optimization. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99425

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universitat Politècnica de València

13. Sánchez Caballero, Samuel. Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos .

Degree: 2012, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/15409

► La optimización de estructuras ha sido una disciplina muy estudiada por numerosos investigadores durante los últimos cuarenta años. A pesar de que durante los primeros… (more)

▼ La optimización de estructuras ha sido una disciplina muy estudiada por numerosos investigadores durante los últimos cuarenta años. A pesar de que durante los primeros veinte años las técnicas de Programación Matemática fueron la herramienta fundamental en este campo, estas han ido perdiendo fuelle frente a un nuevo conjunto de técnicas metaheurísticas basadas en la Computación Evolutiva. De entre destacan, de manera significativa, los Algoritmos Genéticos. La irrupción de estas nuevas técnicas en el campo de la optimización de estructuras es debida, en gran medida, a las dificultades de la programación matemática para realizar la optimización simultánea de las variables de diseño debido a la elevada alinealidad de estas y sus restricciones El objetivo fundamental del presente trabajo es ir un poco más allá en el proceso de la optimización simultánea de las variables de diseño, definiendo un algoritmo que no parte de una estructura predefinida y que incorpora los parámetros que determinan la geometría. A diferencia de los métodos actuales, el algoritmo desarrollado no requiere de ningún tipo de estructura inicial ni otro tipo de información adicional, aparte de la definición de los puntos de aplicación de las cargas, los puntos de apoyo y el tipo de apoyo. El nuevo algoritmo desarrollado se justifica según la siguiente hipótesis: La definición previa de la forma, geometría, regla o modelo preconcebido en una estructura suponen restricciones del diseño en sí mismas y por lo tanto aquel algoritmo que no se encuentre sujeto a estas deberá poder generar diseños necesariamente mejores, o al menos tan buenos como los existentes. A partir de esta hipótesis se desarrolla un nuevo algoritmo con una codificación mixta, adaptada a cada grupo de variables de diseño, donde los diferentes operadores se definen y actúan de forma independiente para grupo. Advisors/Committee Members: Segui Llinares, Vicente Jesús (advisor), Crespo Amorós, José Enrique (advisor), Sellés Cantó, Miguel Ángel (advisor).

Subjects/Keywords: Genetic; Algorithm; Structural; Simultaneous; Optimization; Artificial; Intelligence

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APA (6^th Edition):

Sánchez Caballero, S. (2012). Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/15409

Chicago Manual of Style (16^th Edition):

Sánchez Caballero, Samuel. “Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos .” 2012. Doctoral Dissertation, Universitat Politècnica de València. Accessed December 14, 2019. http://hdl.handle.net/10251/15409.

MLA Handbook (7^th Edition):

Sánchez Caballero, Samuel. “Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos .” 2012. Web. 14 Dec 2019.

Vancouver:

Sánchez Caballero S. Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2012. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10251/15409.

Council of Science Editors:

Sánchez Caballero S. Optimización estructural y topológica de estructuras morfológicamente no definidas mediante algoritmos genéticos . [Doctoral Dissertation]. Universitat Politècnica de València; 2012. Available from: http://hdl.handle.net/10251/15409

Rutgers University

14. Song, Wei, 1981-. Domain composition method and its applications.

Degree: Mechanical and Aerospace Engineering, 2014, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/42451/

Subjects/Keywords: Structural optimization; Topology

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APA (6^th Edition):

Song, Wei, 1. (2014). Domain composition method and its applications. (Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/42451/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Song, Wei, 1981-. “Domain composition method and its applications.” 2014. Thesis, Rutgers University. Accessed December 14, 2019. https://rucore.libraries.rutgers.edu/rutgers-lib/42451/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Song, Wei, 1981-. “Domain composition method and its applications.” 2014. Web. 14 Dec 2019.

Vancouver:

Song, Wei 1. Domain composition method and its applications. [Internet] [Thesis]. Rutgers University; 2014. [cited 2019 Dec 14]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/42451/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Song, Wei 1. Domain composition method and its applications. [Thesis]. Rutgers University; 2014. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/42451/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Munro, Dirk Pieter. A direct approach to structural topology optimization.

Degree: PhD, Mechanical and Mechatronic Engineering, 2017, Stellenbosch University

URL: http://hdl.handle.net/10019.1/101051

► ENGLISH ABSTRACT: This dissertation addresses various topics that emerge from the unification of conventional structural optimization—based on ‘sequential approximate optimization’ (SAO)—with the alternative ‘direct’—or ‘simultaneous… (more)

▼ ENGLISH ABSTRACT: This dissertation addresses various topics that emerge from the unification of conventional structural optimization—based on ‘sequential approximate optimization’ (SAO)—with the alternative ‘direct’—or ‘simultaneous analysis and design’ (SAND)—formulation of the structural topology design problem. Structural topology optimization—in the form of a ‘material distribution problem’—is a generalisation of structural optimization, encompassing and simultaneously addressing al the aspects of structural design. In structural optimization, SAO techniques are preferred because the number of structural analyses—which are expensive, computationally speaking—are ostensibly minimised. However, particularly in the presence of local state-based constraints—e.g. local stress constraints—the sensitivity analyses which accompany traditional ‘nested analysis an design’ (NAND) methods require a prohibitive number of structural analysis runs per design iteration. In the alternative SAND setting, structural analysis is conducted approximately and sequentially: the finite element (FE) equilibrium equations are retained as a set of nonlinear equality constraints and the state variables—i.e. displacements—form part of the overall set of primal variables. Therefore, the FE equilibrium equations may only be satisfied at convergence of the optimization algorithm, and the complex and expensive sensitivity analyses associated with state-based constraints, simplify to the calculation of partial derivatives. Moreover, the equivalent of a single structural analysis only is required per design iteration, notwithstanding the imposition of a large number of state-based constraints. Based on a dual method in theory, we propose a separable and strictly convex quadratic Lagrange-Newton approximate subproblem for use in SAO of the SAND formulated topology design problem. In classical (simply-constrained) minimum compliance design, the dual statement of the subproblem is equivalent to the ever-popular optimality criteria (OC) approach—a class of NAND methods. This relates, in turn, to the known equivalence between dual SAONAND algorithms based on intervening variables and the OC method. Due to the presence of nonlinear equality constraints, the classical SAO procedure (exclusively geared, traditionally, for inequality constrained problems) is extended to a general, nonlinear and nonconvex, mathematical programming framework. It turns out that conventional techniques of enforced convergence and termination in traditional NAND-based SAO may be transplanted into the SAND setting with only minor complications. It is demonstrated that the compounded issues of existence of solutions, mesh-dependence, local minima, and macro-scale manufacturability, may be addressed in a computationally efficient manner by the imposition of so-called ‘slope constraints’—point-wise bounds on the gradient of the material distribution function. For global optimization, random multistart strategies may be pursued. A specialized version… Advisors/Committee Members: Groenwold, Albert A., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Structural design.; SAO (Sequential approximation optimization); Convex programming; Design services; Structural optimization; UCTD

11 more images…

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APA (6^th Edition):

Munro, D. P. (2017). A direct approach to structural topology optimization. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/101051

Chicago Manual of Style (16^th Edition):

Munro, Dirk Pieter. “A direct approach to structural topology optimization.” 2017. Doctoral Dissertation, Stellenbosch University. Accessed December 14, 2019. http://hdl.handle.net/10019.1/101051.

MLA Handbook (7^th Edition):

Munro, Dirk Pieter. “A direct approach to structural topology optimization.” 2017. Web. 14 Dec 2019.

Vancouver:

Munro DP. A direct approach to structural topology optimization. [Internet] [Doctoral dissertation]. Stellenbosch University; 2017. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10019.1/101051.

Council of Science Editors:

Munro DP. A direct approach to structural topology optimization. [Doctoral Dissertation]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/101051

University of Arizona

16. Trondsen, Torvald, 1933-. Optimum design methods .

Degree: 1969, University of Arizona

URL: http://hdl.handle.net/10150/318774

Subjects/Keywords: Structural optimization.; Structural analysis (Engineering)

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APA (6^th Edition):

Trondsen, Torvald, 1. (1969). Optimum design methods . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/318774

Chicago Manual of Style (16^th Edition):

Trondsen, Torvald, 1933-. “Optimum design methods .” 1969. Masters Thesis, University of Arizona. Accessed December 14, 2019. http://hdl.handle.net/10150/318774.

MLA Handbook (7^th Edition):

Trondsen, Torvald, 1933-. “Optimum design methods .” 1969. Web. 14 Dec 2019.

Vancouver:

Trondsen, Torvald 1. Optimum design methods . [Internet] [Masters thesis]. University of Arizona; 1969. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10150/318774.

Council of Science Editors:

Trondsen, Torvald 1. Optimum design methods . [Masters Thesis]. University of Arizona; 1969. Available from: http://hdl.handle.net/10150/318774

17. Gaynor, Andrew Thomas. Topology Optimization Algorithms for Additive Manufacturing.

Degree: 2015, Johns Hopkins University

URL: http://jhir.library.jhu.edu/handle/1774.2/38009

► Topology optimization is a powerful free-form design tool that couples finite element analysis with mathematical programming to systematically design for any number of engineering problems.… (more)

▼ Topology optimization is a powerful free-form design tool that couples finite element analysis with mathematical programming to systematically design for any number of engineering problems. Additive manufacturing (AM), specifically 3D printing, is a manufacturing process where material is added through deposition or melting in a layer-by-layer fashion. Additively manufactured parts are `built' from the bottom up, allowing production of intricate designs without extra effort on the part of the engineer or technician – complexity is often said to be `free'. This dissertation seeks to leverage the full potential of this burgeoning manufacturing technology by developing several new design algorithms based on topology optimization. These include multi-material projection methods appropriate for multiphase 3D printers, an overhang-prevention projection method capable of designing components that do not need sacrificial anchors in metal AM processes, and models for simultaneously optimizing topology and objects embedded in process. These algorithms are demonstrated on several design examples and shown to produce solutions with capabilities that exceed existing designs and/or that require less post-processing in fabrication. Targeting the capabilities of the Polyjet Stratasys 3D printers, a topology optimization algorithm is developed for the design of multi-material compliant mechanisms in which the algorithm ultimately designs both the topology of the part and the placement of each material – one stiff, one more compliant. Results – obtained through development of a both a new multi-material model and through development of a robust topology optimization technique for the elimination of one-node hinges – show the ability to place both soft and stiff material and lead to dramatic improvements in performance of compliant mechanisms. One of the manufacturing challenges in metal powder-based 3D printing technologies is material curling due to internal stress development from the heating and cooling cycle during the printing process. To counteract this phenomena, sacrificial support material is introduced to anchor the part to the build plate, which must then be removed chemically or mechanically in post-production: a time consuming process. Components requiring no post-printing material removal are achieved through development of a topology optimization algorithm to design components to respect a designer-prescribed maximum overhang angle, such that the optimized part can be manufactured without using sacrificial support anchors. Solutions are shown to satisfy the prescribed overhang constraint, along with minimum feature length scale constraints as needed. Finally, an algorithm is developed considering the ability to embed discrete objects such as stiffeners or actuators within a monolithic printed part. Herein, a hybrid continuum-truss topology optimization algorithm is developed to leverage this potential capability, where the algorithm designs not only the continuum phase, but also places discrete truss members within… Advisors/Committee Members: Guest, James K (advisor).

Subjects/Keywords: Topology Optimization; Structural Optimization; Additive Manufacturing; 3D Printing

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APA (6^th Edition):

Gaynor, A. T. (2015). Topology Optimization Algorithms for Additive Manufacturing. (Thesis). Johns Hopkins University. Retrieved from http://jhir.library.jhu.edu/handle/1774.2/38009

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gaynor, Andrew Thomas. “Topology Optimization Algorithms for Additive Manufacturing.” 2015. Thesis, Johns Hopkins University. Accessed December 14, 2019. http://jhir.library.jhu.edu/handle/1774.2/38009.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gaynor, Andrew Thomas. “Topology Optimization Algorithms for Additive Manufacturing.” 2015. Web. 14 Dec 2019.

Vancouver:

Gaynor AT. Topology Optimization Algorithms for Additive Manufacturing. [Internet] [Thesis]. Johns Hopkins University; 2015. [cited 2019 Dec 14]. Available from: http://jhir.library.jhu.edu/handle/1774.2/38009.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gaynor AT. Topology Optimization Algorithms for Additive Manufacturing. [Thesis]. Johns Hopkins University; 2015. Available from: http://jhir.library.jhu.edu/handle/1774.2/38009

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Notre Dame

18. Patrick Murren. Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>.

Degree: MSin Civil Engineering, Civil Engineering and Geological Sciences, 2011, University of Notre Dame

URL: https://curate.nd.edu/show/sn009w05j0c

► This thesis details the development and implementation of a novel design-driven harmony search (DDHS), derived from the recently introduced harmony search algorithm, in a… (more)

Subjects/Keywords: structural optimization; steel frame optimization; steel design; harmony search

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APA (6^th Edition):

Murren, P. (2011). Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/sn009w05j0c

Chicago Manual of Style (16^th Edition):

Murren, Patrick. “Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>.” 2011. Masters Thesis, University of Notre Dame. Accessed December 14, 2019. https://curate.nd.edu/show/sn009w05j0c.

MLA Handbook (7^th Edition):

Murren, Patrick. “Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>.” 2011. Web. 14 Dec 2019.

Vancouver:

Murren P. Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>. [Internet] [Masters thesis]. University of Notre Dame; 2011. [cited 2019 Dec 14]. Available from: https://curate.nd.edu/show/sn009w05j0c.

Council of Science Editors:

Murren P. Development and Implementation of a Design-Driven Harmony Search Algorithm in Steel Frame Optimization</h1>. [Masters Thesis]. University of Notre Dame; 2011. Available from: https://curate.nd.edu/show/sn009w05j0c

Virginia Tech

19. Locatelli, Davide. Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs.

Degree: PhD, Engineering Science and Mechanics, 2012, Virginia Tech

URL: http://hdl.handle.net/10919/26345

► This dissertation investigates the advantages of using curvilinear spars and ribs, termed SpaRibs, to design supersonic aircraft wing-box in comparison to the use of classic… (more)

▼ This dissertation investigates the advantages of using curvilinear spars and ribs, termed SpaRibs, to design supersonic aircraft wing-box in comparison to the use of classic design concepts that employ straight spars and ribs. The intent is to achieve a more efficient load-bearing mechanism and to passively control aeorelastic behavior of the structure under the flight loads. The use of SpaRibs broadens the design space and allows for the natural frequencies and natural mode shape tailoring. The SpaRibs concept is implemented in a new MATLAB-based optimization framework referred to as EBF3SSWingOpt. This framework interfaces different analysis software to perform the tasks required. VisualDOC is used as optimizer; the generation of the SpaRibs geometry and of the structure Finite Element Model (FEM) is performed by MD.PATRAN; MD.NASTRAN is utilized to compute the weight of the structure, the linear static stress analysis and the linear buckling analysis required for the calculation of the response functions. EBF3SSWingOpt optimization scheme performs both the sizing and the shaping of the internal structural elements. Two methods are compared while optimizing the wing-box; a One-Step method in which sizing and topology optimization are carried out simultaneously and a Two-Step method, in which the sizing and topology optimization are carried out separately but in an iterative way. The optimization problem statements for the One-Step and the Two-Step methodologies are presented. Three methods to define the shape of the SpaRibs parametrically are described: (1) the Bounding Box and Base Curves method defines the shape of the SpaRibs based on the shape of two curves called Base Curves which are positioned into the Bounding Box, a rectangular region defined on the plane z=0 and containing the projection of the wing plan-form onto the same plane; (2) the Linked Shape method defines the shape of a set of SpaRibs in a one by one square domain of the natural space. The set of curves is subsequently transformed in the physical space for creating the wing structure geometry layout. The shape of each curve of each set is unique however, mathematical relations link their curvature in an effort to reduce the number of design variables; and (3) the Independent Shape parameterization is similar to the Linked Shape parameterization however, the shape of each curve is unique. The framework and parameterization methods described are applied to optimize different types of wing structures. Following results are presented and discussed: (1) a rectangular wing-box subjected to a chord-wise linearly varying load, optimized using SpaRibs parameterized with Bounding-Box and Base Curves method; (2) a rectangular wing-box subjected to a chord-wise linearly varying load, optimized using SpaRibs parameterized with Linked Shape method; (3) a generic fighter wing subjected to uniform distributed pressure load, optimized using SpaRibs parameterized with Bounding-Box and Base Curves method; (4) a general business jet wing subjected to pull-up… Advisors/Committee Members: Kapania, Rakesh K. (committeechair), Singh, Mahendra P. (committee member), Patil, Mayuresh J. (committee member), Thangjitham, Surot (committee member), Schetz, Joseph A. (committee member).

Subjects/Keywords: Structural Optimization; Wing Optimization; SpaRibs; Aircraft Design; Particle Swarm Optimization; Supersonic Aircraft Design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Locatelli, D. (2012). Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/26345

Chicago Manual of Style (16^th Edition):

Locatelli, Davide. “Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs.” 2012. Doctoral Dissertation, Virginia Tech. Accessed December 14, 2019. http://hdl.handle.net/10919/26345.

MLA Handbook (7^th Edition):

Locatelli, Davide. “Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs.” 2012. Web. 14 Dec 2019.

Vancouver:

Locatelli D. Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs. [Internet] [Doctoral dissertation]. Virginia Tech; 2012. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10919/26345.

Council of Science Editors:

Locatelli D. Optimization of Supersonic Aircraft Wing-Box using Curvilinear SpaRibs. [Doctoral Dissertation]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/26345

Lehigh University

20. Saydam, Duygu. Reliability and Risk of Structural Systems under Progressive and Sudden Damage.

Degree: PhD, Structural Engineering, 2013, Lehigh University

URL: https://preserve.lehigh.edu/etd/1616

► Structural systems are usually subjected to progressive and/or sudden damage throughout their lifetime. Damage can cause a reduced level of safety and increase the life-cycle… (more)

▼ Structural systems are usually subjected to progressive and/or sudden damage throughout their lifetime. Damage can cause a reduced level of safety and increase the life-cycle cost. In order to keep the safety and proper functionality of structures above prescribed thresholds, maintenance interventions should be well planned. Informed decision making for maintaining the required safety and serviceability levels of structural systems under uncertainty during their lifetime can only be achieved through integrated life-cycle management planning. Structural performance assessment and prediction, optimization of inspection and monitoring activities, updating the performance with information from inspection and monitoring, optimization of maintenance and repair activities and decision making are the main tasks of an integrated life-cycle management framework. Accurate prediction and quantification of life-cycle performance is the most critical task in a life-cycle management framework. Uncertainty is inevitable in all aspects of this framework. Aggressive environmental conditions may cause the strength of a structure to deteriorate progressively in time. The deterioration process is complex and contains high uncertainty. Therefore, probabilistic methods are required for accurate assessment of structural performance. Reliability-based performance measures are the primary tool for structural management optimization frameworks. Extreme events such as floods, earthquakes, and blasts may cause sudden damage to structures. A structure must be able to withstand local damage without experiencing disproportionate consequences. Performance measures such as reliability, redundancy, robustness, vulnerability and damage tolerance should be considered in the life-cycle management of structures. Risk-based approaches provide the means of combining the probability of structural failure with the consequences of this event. There is the need to effectively incorporate the risk-based performance measures into the life-cycle management frameworks by accounting for the probabilities of occurrence of failure events and the associated consequences using scenario-based approaches in a computationally efficient manner. The main objective of this study is to develop means for integrating the reliability-based and risk-based performance indicators in a life-cycle management framework for structures undergoing progressive and sudden damage. An approach for quantifying time-variant reliability, redundancy, vulnerability, and robustness of structural systems in a life-cycle context is developed. A methodology for quantifying lifetime risk associated with the component failure and risk-based robustness of bridge superstructures is proposed. Furthermore, a risk-based maintenance optimization methodology for deteriorating bridges to establish optimum maintenance plans is proposed. A methodology to assess the time-dependent expected losses and risk-based robustness of highway bridge networks consisting of deteriorating bridges is established. In addition, a… Advisors/Committee Members: Frangopol, Dan M..

Subjects/Keywords: life-cycle performance; performance indicators; risk; structural damage; structural optimization; structural reliability; Civil and Environmental Engineering; Engineering; Structural Engineering

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APA (6^th Edition):

Saydam, D. (2013). Reliability and Risk of Structural Systems under Progressive and Sudden Damage. (Doctoral Dissertation). Lehigh University. Retrieved from https://preserve.lehigh.edu/etd/1616

Chicago Manual of Style (16^th Edition):

Saydam, Duygu. “Reliability and Risk of Structural Systems under Progressive and Sudden Damage.” 2013. Doctoral Dissertation, Lehigh University. Accessed December 14, 2019. https://preserve.lehigh.edu/etd/1616.

MLA Handbook (7^th Edition):

Saydam, Duygu. “Reliability and Risk of Structural Systems under Progressive and Sudden Damage.” 2013. Web. 14 Dec 2019.

Vancouver:

Saydam D. Reliability and Risk of Structural Systems under Progressive and Sudden Damage. [Internet] [Doctoral dissertation]. Lehigh University; 2013. [cited 2019 Dec 14]. Available from: https://preserve.lehigh.edu/etd/1616.

Council of Science Editors:

Saydam D. Reliability and Risk of Structural Systems under Progressive and Sudden Damage. [Doctoral Dissertation]. Lehigh University; 2013. Available from: https://preserve.lehigh.edu/etd/1616

21. JoÃo Baptista Cardoso Athayde Lima. ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas.

Degree: Master, 2011, Universidade Federal do Ceará

URL: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8131 ;

►

As grandes questÃes do mundo globalizado tÃm passado, necessariamente, pelos temas ligados Ã sustentabilidade, energia limpa, exploraÃÃo do meio ambiente de forma ecologicamente correta e… (more)

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As grandes questÃes do mundo globalizado tÃm passado, necessariamente, pelos temas ligados Ã sustentabilidade, energia limpa, exploraÃÃo do meio ambiente de forma ecologicamente correta e inovaÃÃo tecnolÃgica para manter o planeta saudÃvel. Nesse contexto, a energia eÃlica vem se destacando, principalmente na regiÃo Nordeste do Brasil, pelo grande potencial dos ventos e as caracterÃsticas de renovabilidade e complementaridade com a energia das hidrelÃtricas. As torres, que representam parcela significativa do custo do sistema, tendem a crescer buscando ventos com maiores velocidade e permitindo a utilizaÃÃo de turbinas eÃlicas de maior capacidade de geraÃÃo, acentuando-se a sua importÃncia como elemento estrutural do sistema. O objetivo geral deste trabalho Ã formular um modelo de otimizaÃÃo de torres tubulares de aÃo, composta de segmentos em tronco de cone. Busca-se a soluÃÃo de peso mÃnimo, tendo como variÃveis de projeto os diÃmetros externos e as espessuras de chapa caracterÃsticas de cada segmento. RestriÃÃes relativas Ã resistÃncia, Ã estabilidade e rigidez sÃo impostas com base em normas brasileiras. RestriÃÃes relativas Ã frequÃncia natural, a limitaÃÃes de transporte e geomÃtricas sÃo tambÃm requeridas. O conjunto nacele/rotor Ã modelado como uma massa rÃgida fixada no topo da torre, sem rotaÃÃo, e o carregamento atuante na estrutura inclui os pesos da torre e do conjunto rotor/nacele, o efeito estÃtico da aÃÃo do vento sobre a torre e as pÃs do rotor. A concepÃÃo de anÃlise adota modelo de viga engastada na base e livre no topo e emprega uma formulaÃÃo nÃo linear geomÃtrica pelo MÃtodo de Elementos finitos usando um programa em C++. O modelo de otimizaÃÃo foi implementado no MATLAB e, devido Ã natureza discreta das variÃveis de projeto e Ãs descontinuidades de funÃÃes de restriÃÃo e de suas derivadas, utilizam-se algoritmos genÃticos na soluÃÃo. Buscas na vizinhanÃa das soluÃÃes discretas sÃo realizadas usando um algoritmo baseado em informaÃÃo de gradiente (fmincon do MATLAB). AplicaÃÃes para vÃrias alturas de torre sÃo feitas, incluindo comparaÃÃes com uma torre cilÃndrica para validaÃÃo do modelo. Os resultados sÃo analisados frente aos de outros modelos da literatura. Os conceitos de projeto de torre rÃgida e flexÃvel sÃo discutidos relaxando-se as restriÃÃes de rigidez e de frequÃncia. SoluÃÃes obtidas sÃo analisadas usando elementos de casca do programa de anÃlise ABAQUS para verificaÃÃo de tensÃes e deslocamentos

The main subjects of the globalized world have passed necessarily by issues related to sustainability, clean energy, environment exploration in an ecologically correct way, and technology innovation to maintain a healthy planet. In this context, the wind has been highlighting, especially in the Northeast of Brazil, because of the large wind potential and the characteristics of renewability and complementarily with hydropower energy. The towers represent significant portion of the cost of the system, tends to grow seeking greatest wind speeds and allowing the use of wind turbines with…

Advisors/Committee Members: AntÃnio MacÃrio Cartaxo de Melo.

Subjects/Keywords: ENGENHARIA CIVIL; Engenharia Estrutural; Estruturas de aÃo; OtimizaÃÃo estrutural; Structural Engineering; Steel Structures; Structural Optimization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lima, J. B. C. A. (2011). ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas. (Masters Thesis). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8131 ;

Chicago Manual of Style (16^th Edition):

Lima, JoÃo Baptista Cardoso Athayde. “ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas.” 2011. Masters Thesis, Universidade Federal do Ceará. Accessed December 14, 2019. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8131 ;.

MLA Handbook (7^th Edition):

Lima, JoÃo Baptista Cardoso Athayde. “ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas.” 2011. Web. 14 Dec 2019.

Vancouver:

Lima JBCA. ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas. [Internet] [Masters thesis]. Universidade Federal do Ceará 2011. [cited 2019 Dec 14]. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8131 ;.

Council of Science Editors:

Lima JBCA. ContribuiÃÃes para otimizaÃÃo estrutural de torres tubulares de aÃo para turbinas eÃlicas. [Masters Thesis]. Universidade Federal do Ceará 2011. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8131 ;

University of Southern California

22. Makris, Michael Patrick. Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses.

Degree: Master of Building Science, Building Science, 2013, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/305175/rec/6113

► This thesis describes the development, testing, and findings of a Rhino-Grasshopper toolset developed to encourage real-time parametric design form experimentation through immediate integrated structural analysis… (more)

Subjects/Keywords: design decision support; Grasshopper; optimization; parametric design; structural analysis; structural design; parametric architecture

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Makris, M. P. (2013). Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses. (Masters Thesis). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/305175/rec/6113

Chicago Manual of Style (16^th Edition):

Makris, Michael Patrick. “Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses.” 2013. Masters Thesis, University of Southern California. Accessed December 14, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/305175/rec/6113.

MLA Handbook (7^th Edition):

Makris, Michael Patrick. “Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses.” 2013. Web. 14 Dec 2019.

Vancouver:

Makris MP. Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses. [Internet] [Masters thesis]. University of Southern California; 2013. [cited 2019 Dec 14]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/305175/rec/6113.

Council of Science Editors:

Makris MP. Structural design tool for performative building elements: a semi-automated Grasshopper plugin for design decision support of complex trusses. [Masters Thesis]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/305175/rec/6113

23. Gomes, Wellison José de Santana. Otimização de riscos sob processos aleatórios de corrosão e fadiga.

Degree: PhD, Estruturas, 2013, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032013-104724/ ;

►

Processos aleatórios de corrosão e fadiga reduzem lentamente a resistência de estruturas e componentes estruturais, provocando um aumento gradual nas probabilidades de falha. A gestão… (more)

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Processos aleatórios de corrosão e fadiga reduzem lentamente a resistência de estruturas e componentes estruturais, provocando um aumento gradual nas probabilidades de falha. A gestão do risco de falha de componentes sujeitos a corrosão e/ou fadiga é feita através de políticas de inspeção, manutenção e substituição, atividades que implicam em custos, mas visam manter a confiabilidade em níveis aceitáveis, enquanto o componente permanecer em operação. Aparentemente, os objetivos economia e segurança competem entre si, no entanto, a redução de recursos para inspeção e manutenção pode levar a maiores e crescentes probabilidades de falha, implicando em maiores custos esperados de falha, ou seja, maior risco. A otimização de risco estrutural é uma formulação que permite equacionar este problema, através do chamado custo esperado total. Nesta Tese, a otimização de risco é utilizada no intuito de encontrar políticas ótimas de inspeção e manutenção, isto é, quantidades de recursos a serem alocadas nestas atividades que levem ao menor custo esperado total possível. Os processos de corrosão e fadiga são representados através de modelos em polinômios de caos, construídos de maneira inédita, com base em dados experimentais ou observados da literatura. Com base nestes modelos, os problemas de otimização de risco envolvendo processos de fadiga e corrosão são resolvidos para diferentes configurações de custos de falha e de inspeções. Verifica-se que as políticas ótimas de inspeção, manutenção e substituição podem ser bastante diferentes para configurações de custo distintas, e que a determinação destas políticas é bastante desafiadora, devido, dentre outros fatores, à grande quantidade de mínimos locais do problema de otimização em questão, causadas por descontinuidades e oscilações da função custo esperado total.

Random corrosion and fatigue processes reduce slowly but gradually the resistance of structures and mechanical components, leading to gradual increase in failure probabilities. Risk management for mechanical components subject to corrosion and fatigue is made by means of policies of inspection, maintenance and substitution. These activities imply costs, but are made to maintain the reliability at acceptable levels, while the component remains in operation. Apparently, economy and safety are competing objectives; however, reduction in inspection and maintenance spending may lead to larger failure probabilities, increasing expected costs of failure (risk). Risk optimization allows one to solve this problem, by means of the so-called total expected cost. In this Thesis, risk optimization is used in order to find the best inspection and maintenance policy, i.e., the proper amount of resources to allocate to such activities in order to obtain minimum total expected cost. Corrosion and fatigue are modeled by means of polynomial chaos expansions, using a novel approach developed herein and experimental or observed data obtained from the literature. These models are employed within two risk optimization problems, solved for…

Advisors/Committee Members: Beck, André Teófilo.

Subjects/Keywords: Confiabilidade estrutural; Otimização de risco; Otimização estrutural; Polinômios de caos; Polynomial chaos; Risk optimization; Structural optimization; Structural reliability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gomes, W. J. d. S. (2013). Otimização de riscos sob processos aleatórios de corrosão e fadiga. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032013-104724/ ;

Chicago Manual of Style (16^th Edition):

Gomes, Wellison José de Santana. “Otimização de riscos sob processos aleatórios de corrosão e fadiga.” 2013. Doctoral Dissertation, University of São Paulo. Accessed December 14, 2019. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032013-104724/ ;.

MLA Handbook (7^th Edition):

Gomes, Wellison José de Santana. “Otimização de riscos sob processos aleatórios de corrosão e fadiga.” 2013. Web. 14 Dec 2019.

Vancouver:

Gomes WJdS. Otimização de riscos sob processos aleatórios de corrosão e fadiga. [Internet] [Doctoral dissertation]. University of São Paulo; 2013. [cited 2019 Dec 14]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032013-104724/ ;.

Council of Science Editors:

Gomes WJdS. Otimização de riscos sob processos aleatórios de corrosão e fadiga. [Doctoral Dissertation]. University of São Paulo; 2013. Available from: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-26032013-104724/ ;

24. Nilsson, Philip. Topology optimization of a swing arm for a track driven vechile.

Degree: Physics, 2018, Umeå University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149608

►

The development in additive manufacturing methods has cleared the path for topology optimizationby making it possible to produce complex geometries, which would not be… (more)

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The development in additive manufacturing methods has cleared the path for topology optimizationby making it possible to produce complex geometries, which would not be possible to produce bytraditional manufacturing methods. Topology optimization uses iterative structural computations tond an optimal material distribution given a maximum optimization domain, load cases and/or otherstructural criteria. The relation between retained mass and structural performance of a swing armfor the vehicle BvS10 was examined for two different materials. The first material was an estimate of an additive manufactured material and the other for a high structural steel. Given the extreme load cases, the geometrical limits of the swing arm and by specifying how much mass was to be retained the stiffness was to be maximized. The optimization was performed using an elastic material model in thecommercial software ANSYS. This elastic material models was based on standard material parameters of steel. Three geometries were generated, namely OG100, OG90 and OG80, which corresponded to 101 %, 87 % and 81 % of the mass of the original swing arm, respectively. The optimization procedurewas combined with geometry modications in SpaceClaim to simplify the obtained geometries. All these geometries consisted of a hollow geometry with a greater width compared to the original geometry. The geometries were then evaluated using multilinear plastic material models based on respective material. Using the additive manufactured material model no generated geometry could perform structurally better than the original swing arm. This indicates that greater material properties must be obtainedin order to be able to reduce the weight of the swing arm. By using the material properties of the highstructural steel, it was found that at least 31.3 kg per vehicle could be reduced by using the optimizedgeometry OG80, and still not perform structurally worse than of the original swing arm.

Utvecklingen inom additiv tillverkning har öppnat vägen för topologioptimering genom att kunna producera komplexa geometrier, som inte skulle vara möjliga att tillverka med hjälp av traditionella tillverkningsmetoder. Topologioptimering använder iterativa hållfasthetsberäkningar för att finna den optimala materialfördelning givet en maximal optimeringsdomän, lastfall och/eller andra strukturella kriterier. Relationen mellan bibehållen massa och strukturella prestationer hos en pendelarm till fordonet BvS10 har undersökts för två olika material. Det ena materialet var en uppskattning av ett additivt tillverkat material och det andra materialet var ett höghållfasthetsstål. Givet dem extrema lastfall, geometriska begränsningar hos pendelarmen och genom specficera hur mycket massa som skulle behållas så skulle styvheten maximeras. Optimeringarna utfördes med en elastisk materialmodell i den kommersiellamjukvaran ANSYS. Denna elastiska materialmodell var baserad på klassiska materialparametrarfor stål. Tre geometrier genererades. Optimeringsproceduren användes i kombination…

Subjects/Keywords: topology optimization; optimization; structural analysis; ANSYS; structural simulations; topologioptimering; optimering; hållfasthetsanalys; ANSYS; hållfasthetssimuleringar; Other Physics Topics; Annan fysik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nilsson, P. (2018). Topology optimization of a swing arm for a track driven vechile. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149608

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nilsson, Philip. “Topology optimization of a swing arm for a track driven vechile.” 2018. Thesis, Umeå University. Accessed December 14, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149608.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nilsson, Philip. “Topology optimization of a swing arm for a track driven vechile.” 2018. Web. 14 Dec 2019.

Vancouver:

Nilsson P. Topology optimization of a swing arm for a track driven vechile. [Internet] [Thesis]. Umeå University; 2018. [cited 2019 Dec 14]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149608.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nilsson P. Topology optimization of a swing arm for a track driven vechile. [Thesis]. Umeå University; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149608

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Durban University of Technology

25. Van Wyk, David. The development of an advanced composite structure using evolutionary design methods.

Degree: 2008, Durban University of Technology

URL: http://hdl.handle.net/10321/497

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Thesis submitted in compliance with the requirements for the Master's Degree in Technology: Department of Mechanical Engineering, Durban University of Technology, 2008.

The development of… (more)

Subjects/Keywords: Composite materials; Structural optimization; Mathematical optimization; Uninhabited combat aerial vehicles – Design and construction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Van Wyk, D. (2008). The development of an advanced composite structure using evolutionary design methods. (Thesis). Durban University of Technology. Retrieved from http://hdl.handle.net/10321/497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Van Wyk, David. “The development of an advanced composite structure using evolutionary design methods.” 2008. Thesis, Durban University of Technology. Accessed December 14, 2019. http://hdl.handle.net/10321/497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Van Wyk, David. “The development of an advanced composite structure using evolutionary design methods.” 2008. Web. 14 Dec 2019.

Vancouver:

Van Wyk D. The development of an advanced composite structure using evolutionary design methods. [Internet] [Thesis]. Durban University of Technology; 2008. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10321/497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Van Wyk D. The development of an advanced composite structure using evolutionary design methods. [Thesis]. Durban University of Technology; 2008. Available from: http://hdl.handle.net/10321/497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

RMIT University

26. Li, Y. Topology optimization of compliant mechanisms based on the BESO method.

Degree: 2014, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:160950

► This dissertation explores topology optimization techniques for designing compliant mechanisms actuated by forces. For a compliant mechanism, it has the potential of reducing part count,… (more)

▼ This dissertation explores topology optimization techniques for designing compliant mechanisms actuated by forces. For a compliant mechanism, it has the potential of reducing part count, mechanical joints, operation noise, and manufacturing and assembly costs over a traditional rigid-link mechanism. Thus the application of compliant mechanisms is becoming increasingly prevalent in medical instruments and mechanical devices. Optimization of compliant mechanisms has drawn intense attention of many researchers. However, this design field has been facing many challenges and shortages in several aspects such as optimization method, optimization algorithm and resulting topology. For example, convergence problems often lead to vague solutions. Optimization algorithms are not very suitable to investigate the real physical significance. Furthermore, designs of compliant mechanisms using topology optimization techniques naturally lead to the introduction of hinges into final topologies. In addition, the previous design also focuses mainly on the optimal design of linear compliant mechanisms. In fact, optimizing nonlinear compliant mechanisms is proving quite necessary in real applications as the simulation is more accurate. Therefore, it is important to devote efforts to the modification of previous optimization techniques for constructing practical compliant mechanism designs. This dissertation proposes a modified bi-directional evolutionary structural optimization (BESO) method for the optimal design of linear and geometrically nonlinear compliant mechanisms. Numerical algorithms based on the BESO method are developed through various objectives and constraints in compliant mechanism design. Firstly, to consider functional behaviours of compliant mechanisms, sets of clear and suitable structural configurations are produced by quantifying various performance characteristics and changing the stiffness of attached springs. This implies that material distribution and hinge formation are demonstrated in this work. To achieve prescribed structural stiffness for optimized mechanisms, a new BESO algorithm is established for solving the proposed optimization problem by gradually updating design variables. The inverter and the gripper optimization problems serve to demonstrate the practicability and effectiveness of the proposed method. Besides this, a new formulation is established by considering desirable deformation and simultaneously precluding the formation of hinges in order to design hinge-free compliant mechanisms, verified by a large number of numerical experiments including rare 3D hinge-free designs. Furthermore, compliant mechanisms often undergo large displacement, in order to provide their functionality. Therefore, the research also addresses the optimal design of compliant mechanism with geometrically nonlinear behaviours. With the aid of the hard-kill BESO method, a new systemic design approach is developed to overcome the convergence difficulty caused by extreme deformation in the nonlinear finite element analysis.…

Subjects/Keywords: Fields of Research; Compliant mechanism; Topology optimization; Sensitivity analysis; Bi-directional evolutionary structural optimization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, Y. (2014). Topology optimization of compliant mechanisms based on the BESO method. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Y. “Topology optimization of compliant mechanisms based on the BESO method.” 2014. Thesis, RMIT University. Accessed December 14, 2019. http://researchbank.rmit.edu.au/view/rmit:160950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Y. “Topology optimization of compliant mechanisms based on the BESO method.” 2014. Web. 14 Dec 2019.

Vancouver:

Li Y. Topology optimization of compliant mechanisms based on the BESO method. [Internet] [Thesis]. RMIT University; 2014. [cited 2019 Dec 14]. Available from: http://researchbank.rmit.edu.au/view/rmit:160950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li Y. Topology optimization of compliant mechanisms based on the BESO method. [Thesis]. RMIT University; 2014. Available from: http://researchbank.rmit.edu.au/view/rmit:160950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Loughborough University

27. Aremu, Adedeji. Topology optimization for additive manufacture.

Degree: PhD, 2013, Loughborough University

URL: https://dspace.lboro.ac.uk/2134/12833 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658245

► Additive manufacturing (AM) offers a way to manufacture highly complex designs with potentially enhanced performance as it is free from many of the constraints associated… (more)

▼ Additive manufacturing (AM) offers a way to manufacture highly complex designs with potentially enhanced performance as it is free from many of the constraints associated with traditional manufacturing. However, current design and optimisation tools, which were developed much earlier than AM, do not allow efficient exploration of AM's design space. Among these tools are a set of numerical methods/algorithms often used in the field of structural optimisation called topology optimisation (TO). These powerful techniques emerged in the 1980s and have since been used to achieve structural solutions with superior performance to those of other types of structural optimisation. However, such solutions are often constrained during optimisation to minimise structural complexities, thereby, ensuring that solutions can be manufactured via traditional manufacturing methods. With the advent of AM, it is necessary to restructure these techniques to maximise AM's capabilities. Such restructuring should involve identification and relaxation of the optimisation constraints within the TO algorithms that restrict design for AM. These constraints include the initial design, optimisation parameters and mesh characteristics of the optimisation problem being solved. A typical TO with certain mesh characteristics would involve the movement of an assumed initial design to another with improved structural performance. It was anticipated that the complexity and performance of a solution would be affected by the optimisation constraints. This work restructured a TO algorithm called the bidirectional evolutionary structural optimisation (BESO) for AM. MATLAB and MSC Nastran were coupled to study and investigate BESO for both two and three dimensional problems. It was observed that certain parametric values promote the realization of complex structures and this could be further enhanced by including an adaptive meshing strategy (AMS) in the TO. Such a strategy reduced the degrees of freedom initially required for this solution quality without the AMS.

Subjects/Keywords: 621.9; Additive manufacturing; Topology optimization; Adaptive meshing; Bi-directional evolutionary structural optimization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aremu, A. (2013). Topology optimization for additive manufacture. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/12833 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658245

Chicago Manual of Style (16^th Edition):

Aremu, Adedeji. “Topology optimization for additive manufacture.” 2013. Doctoral Dissertation, Loughborough University. Accessed December 14, 2019. https://dspace.lboro.ac.uk/2134/12833 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658245.

MLA Handbook (7^th Edition):

Aremu, Adedeji. “Topology optimization for additive manufacture.” 2013. Web. 14 Dec 2019.

Vancouver:

Aremu A. Topology optimization for additive manufacture. [Internet] [Doctoral dissertation]. Loughborough University; 2013. [cited 2019 Dec 14]. Available from: https://dspace.lboro.ac.uk/2134/12833 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658245.

Council of Science Editors:

Aremu A. Topology optimization for additive manufacture. [Doctoral Dissertation]. Loughborough University; 2013. Available from: https://dspace.lboro.ac.uk/2134/12833 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658245

Stellenbosch University

28. De Villiers, Nico-Ben. Optimality in sewer network design.

Degree: PhD, Civil Engineering, 2018, Stellenbosch University

URL: http://hdl.handle.net/10019.1/103463

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ENGLISH ABSTRACT: Sewer networks form a vital part of urban infrastructure and represent a capital intensive expense in the public sector. In South Africa, a… (more)

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ENGLISH ABSTRACT: Sewer networks form a vital part of urban infrastructure and represent a capital intensive expense in the public sector. In South Africa, a recent estimation stated that R44.75 billion is required to provide basic sanitation services to those in need, while the budget allocation for sanitation was approximately R3.2 billion nation wide. This state of affairs is not limited to South Africa alone. It is clear that funds allocated to sanitation have to be spent as effectively as possible. It is within this space that this dissertation makes a contribution, by exploiting modern digital computing power and optimization techniques to find more cost effective solutions to sewer network design and analysis problems. This investigation proposes and evaluates new solutions that address critical shortcomings in existing sewer network optimization algorithms. The distinct lack of adequate benchmark problems to test and compare the performance of new sewer network optimization algorithms is addressed and a thorough investigation into the nature of optimal solutions is made by capturing trial solutions of optimization algorithms at regular intervals. The characteristics of the solutions are quantified through proposed network characteristic parameters. The evolution of trial solution characteristics allow insight and understanding into how the network changed over the course of the algorithm's life cycle. This information is then exploited to propose heuristic influence factors which guide the optimization procedures toward decisions favouring characteristics which have demonstrated good solution fitness. In this way the proposed sewer network optimization algorithms, which are shown to perform better than the algorithms it took inspiration from, are further improved through the use of heuristics. The heuristics, and their formulation, reveal characteristics of optimal sewer network designs which can be used by future researchers as well as design engineers, to improve their solutions.

AFRIKAANSE OPSOMMING: Rioolnetwerke vorm 'n belangrike deel van stedelike infrastruktuur en verteenwoordig 'n kapitale intensiewe koste in die openbare sektor. In Suid-Afrika, verklaar 'n onlangse beraming dat R44.75 miljard nodig is om basiese sanitasiedienste te verskaf aan diegene in nood, terwyl die begrotingstoewysing vir sanitasie nagenoeg R3.2 miljard landwyd was. Hierdie stand van sake is nie net beperk tot Suid-Afrika nie. Dit is duidelik dat fondse toegewys aan sanitasie so effektief as moontlik bestee moet word. Dit is binne hierdie spasie dat hierdie proefskrif 'n bydrae lewer, deur die gebruik van moderne digitale rekenkrag en optimaliseringstegnieke om meer kostee effektiewe oplossings vir rioolnetwerkontwerp en ontledingsprobleme te vind. Hierdie ondersoek stel en evalueer nuwe oplossings wat kritieke tekortkominge aanspreek in bestaande rioolnetwerk optimalisering algoritmes. Die duidelike gebrek aan voldoende maatstafprobleme om die prestasie van nuwe rioolnetwerk optimalisering algoritmes te…

Advisors/Committee Members: Van Rooyen, G. C., Sinske, A. N., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..

Subjects/Keywords: Structural optimization; Sewer Network Design; Graph Theory; Sanitation; Hydraulic Optimization; UCTD; Sewer design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

De Villiers, N. (2018). Optimality in sewer network design. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/103463

Chicago Manual of Style (16^th Edition):

De Villiers, Nico-Ben. “Optimality in sewer network design.” 2018. Doctoral Dissertation, Stellenbosch University. Accessed December 14, 2019. http://hdl.handle.net/10019.1/103463.

MLA Handbook (7^th Edition):

De Villiers, Nico-Ben. “Optimality in sewer network design.” 2018. Web. 14 Dec 2019.

Vancouver:

De Villiers N. Optimality in sewer network design. [Internet] [Doctoral dissertation]. Stellenbosch University; 2018. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10019.1/103463.

Council of Science Editors:

De Villiers N. Optimality in sewer network design. [Doctoral Dissertation]. Stellenbosch University; 2018. Available from: http://hdl.handle.net/10019.1/103463

University of Colorado

29. Lawry, Matthew W. A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena.

Degree: PhD, 2016, University of Colorado

URL: https://scholar.colorado.edu/asen_gradetds/186

► This thesis introduces a comprehensive computational methodology for the topology optimization of contact problems, which is relevant to a broad range of engineering applications. The… (more)

▼ This thesis introduces a comprehensive computational methodology for the topology optimization of contact problems, which is relevant to a broad range of engineering applications. The proposed methodology is capable of handling geometric and material nonlinearities, unilateral and bilateral contact behavior, small and large contact surface sliding, various contact constitutive relations, and the analysis of both two and three dimensional problems. The Level Set Method (LSM) in combination with the eXtended Finite Element Method (XFEM) is used to provide geometry control while maintaining precise definition of the interface. Contact constitutive relations are enforced weakly at the interface using a surface-to-surface integration method. A nonlinear programming scheme is used to solve the optimization problem, and sensitivities are determined using the adjoint method. To demonstrate mechanical model accuracy and explore the defining characteristics of the proposed method, verification and optimization studies were performed on small strain frictionless contact problems in two dimensions, small strain cohesive problems in two and three dimensions, and large strain frictionless contact problems in two dimensions. The proposed method has shown great promise to achieve optimized geometry for a wide variety of contact behavior. Numerical examples demonstrate that in general, optimal geometry for contact problems depends heavily on the interface constitutive behavior. Three dimensional studies reveal design traits that cannot be characterized in two dimensions. Finally, numerical examples with large sliding contact behavior demonstrate that non-intuitive design solutions can be achieved for surfaces which experience contact over a broad range of motion. Mechanical model accuracy and optimization reliability concerns are discussed for a variety of contact behavioral assumptions and stabilization techniques. Advisors/Committee Members: Kurt Maute, Alireza Doostan, Carlos Felippa, John Evans, Jeong-Hoon Song.

Subjects/Keywords: computational contact mechanics; level set methods; structural optimization; topology optimization; XFEM; Aerospace Engineering; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lawry, M. W. (2016). A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/186

Chicago Manual of Style (16^th Edition):

Lawry, Matthew W. “A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena.” 2016. Doctoral Dissertation, University of Colorado. Accessed December 14, 2019. https://scholar.colorado.edu/asen_gradetds/186.

MLA Handbook (7^th Edition):

Lawry, Matthew W. “A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena.” 2016. Web. 14 Dec 2019.

Vancouver:

Lawry MW. A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2019 Dec 14]. Available from: https://scholar.colorado.edu/asen_gradetds/186.

Council of Science Editors:

Lawry MW. A Topology Optimization Method for Structural Designs Reliant on Contact Phenomena. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/asen_gradetds/186

30. Georgios, Bekas. Life cost analysis and optimization for steel and reinforced concrete structures.

Degree: 2017, Technical University of Crete (TUC); Πολυτεχνείο Κρήτης

URL: http://hdl.handle.net/10442/hedi/41812

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The present study seeks to investigate the factors that play a key role in the whole life cost of a new building construction, aiming to… (more)

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The present study seeks to investigate the factors that play a key role in the whole life cost of a new building construction, aiming to its minimization with the use of the optimization theory. An analysis on the notion of the whole life cost, as well as of the subsystems that primarily influence the whole life cost of a typical building, leads to the conclusion that the subsystems related to its massing, its structural components and its energy performance, are the ones whose optimization -at an early stage- has significant importance.The models that will be presented are based on the calculation and optimization of the most critical parameters related to the energy and the structural design of buildings with steel, timber or reinforced concrete frames. The examined variables of the optimization therefore concern all the characteristic structural, envelope, mechanical and energy subsystems throughout their life cycle (building envelope U-values in every possible orientation, area of windows in every possible orientation of the building, window glazing solar gain coefficient, power and performance of the heating and the cooling HVAC systems, cross sections of all the beam and column elements of the building, optimal number of frame bays, optimal lengths of frame bays, spacing among frames). Various life cycle periods with different durations and building plans, are examined. Other parameters that are analyzed, is the effect of the fuzziness of the design temperature inside a building on its life cycle cost, maintenance and potential replacement of the examined subsystems and methods to predict an optimal scenario for the management of the structural frame components at the end of a building's life cycle. The modeling is based on KENAK, the Eurocodes, evolutionary algorithms, statistical, stochastic and machine learning systems. A literature review regarding modern specifications and scientific approaches has also included in the study, about the following topics: life cycle analysis, whole life cost analysis, multivariate statistics and machine learning, stochastic processes and optimization, energy simulation of buildings, sizing of thermal and cooling systems, structural design of steel, RC or timber buildings.

Η παρούσα μελέτη επιχειρεί να διερευνήσει τους παράγοντες που διαδραματίζουν βασικό ρόλο στο κόστος ολικής ζωής μιας νέας κτιριακής κατασκεύης, με στόχο την ελαχιστοποίησή του με τη χρήση της θεωρίας βελτιστοποίησης. H ανάλυση της έννοιας του κόστους ολικής ζωής ενός τυπικού κτιρίου, καθώς και των υποσυστημάτων που το αποτελούν, οδηγεί στο συμπέρασμα ότι τα υποσυστήματα που σχετίζονται με τη μάζα, τα δομικά συστήματα και την ενεργειακή του απόδοση, είναι εκείνα των οποίων η βελτιστοποίηση -σε πρώιμο στάδιο- έχει μεγάλη σημασία.Τα μοντέλα που θα παρουσιαστούν βασίζονται στον υπολογισμό και τη βελτιστοποίηση των πλέον κρίσιμων παραμέτρων, που σχετίζονται με τον ενεργειακό και τον δομοστατικό σχεδιασμό των κτιρίων. Παρουσιάζονται παραδείγματα με κτίρια με σκελετούς από χάλυβα, δομική ξυλεία ή οπλισμένο…

Subjects/Keywords: Κόστος ολικής ζωής; Δομοστατική βελτιστοποίηση; Ενεργειακή βελτιστοποίηση; ΚΕΝΑΚ; Whole life cost; Structural optimization; Energy optimization

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Georgios, B. (2017). Life cost analysis and optimization for steel and reinforced concrete structures. (Thesis). Technical University of Crete (TUC); Πολυτεχνείο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/41812

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Georgios, Bekas. “Life cost analysis and optimization for steel and reinforced concrete structures.” 2017. Thesis, Technical University of Crete (TUC); Πολυτεχνείο Κρήτης. Accessed December 14, 2019. http://hdl.handle.net/10442/hedi/41812.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Georgios, Bekas. “Life cost analysis and optimization for steel and reinforced concrete structures.” 2017. Web. 14 Dec 2019.

Vancouver:

Georgios B. Life cost analysis and optimization for steel and reinforced concrete structures. [Internet] [Thesis]. Technical University of Crete (TUC); Πολυτεχνείο Κρήτης; 2017. [cited 2019 Dec 14]. Available from: http://hdl.handle.net/10442/hedi/41812.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Georgios B. Life cost analysis and optimization for steel and reinforced concrete structures. [Thesis]. Technical University of Crete (TUC); Πολυτεχνείο Κρήτης; 2017. Available from: http://hdl.handle.net/10442/hedi/41812

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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