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You searched for subject:(impulse excitation technique). Showing records 1 – 3 of 3 total matches.

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Purdue University

1. Sundaram, Vaidyanadan. Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses.

Degree: MS, Mechanical Engineering, 2014, Purdue University

Flexible polyurethane foam is the main cushioning element used in car seats. Optimization of an occupied seat's static and dynamic behavior requires models of foam that are accurate over a wide range of excitation and pre-compression conditions. Experiments were conducted to measure the response of foam over a wide range of excitation which include slowly varying uniaxial compression tests on a 3 inch cube foam sample, base excitation and impulse excitation test on a foam-mass system. The foam used was the same in all of the experiments, thus obtaining all the responses on the same foam sample which helps eliminate the sample to sample variation. Similar efforts were taken to conduct impulse and base excitation tests on CONFOR(TM) foam to help in future modeling efforts of CONFOR(TM) foam. All the experimental protocols and data pre-processing protocols along with results are presented. Previous researcher developed a linear model for a single-degree of freedom foam-mass system subjected to an impulsive excitation. Free response data from impulse tests on a foam-mass system with different masses was used to identify model parameters at various pre-compression levels (settling points). The free response of the system was modeled as a Prony series (sum of exponentials) whose parameters can be related to the parameters in the foam-mass system model. Models identified from tests at one settling point performed poorly when used to predict the response at other settling points. In this research, a method is described to estimate the parameters of a global model of the foam behavior from data gathered in a series of impulse tests at different settling points. The global model structure includes a nonlinear elastic term and a hereditary viscoelastic term. The model can be used to predict the settling point for each mass used and, by expanding the model about that settling point, local linear models of the response to impulsive excitation can be derived. From this analysis the relationship between the local linear model parameters and the global model parameters was defined. A series of experiments were conducted using different sized masses on the foam block. For each mass, the settling point was measured and the free response after an impulsive excitation was modeled as a Prony series whose parameters can be related to the parameters in the local linear dynamic model. By using the relationship between the local and global model parameters and estimates of the local models' parameters, the parameters of the global model were estimated. The estimation method was first applied to simulation data and then used to identify models of the uniaxial dynamic behavior of polyurethane foam blocks. Advisors/Committee Members: Patricia Davies, Anil K. Bajaj, Eric A. Nauman, J.S. Bolton.

Subjects/Keywords: Applied sciences; Confor and polyurethane foam; Data processing protocol; Impulse; Base excitation experiments; System identification technique; Testing guidelines for repeatability; Materials Science and Engineering; Mechanical Engineering

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

APA (6th Edition):

Sundaram, V. (2014). Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses. (Thesis). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_theses/384

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

Chicago Manual of Style (16th Edition):

Sundaram, Vaidyanadan. “Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses.” 2014. Thesis, Purdue University. Accessed November 23, 2020. http://docs.lib.purdue.edu/open_access_theses/384.

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

MLA Handbook (7th Edition):

Sundaram, Vaidyanadan. “Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses.” 2014. Web. 23 Nov 2020.

Vancouver:

Sundaram V. Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses. [Internet] [Thesis]. Purdue University; 2014. [cited 2020 Nov 23]. Available from: http://docs.lib.purdue.edu/open_access_theses/384.

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

Council of Science Editors:

Sundaram V. Measurement Of The Responses Of Polyurethane And Confortm Foams And The Development Of A System Identification Technique To Estimate Polyurethane Foam Parameters From Experimental Impulse Responses. [Thesis]. Purdue University; 2014. Available from: http://docs.lib.purdue.edu/open_access_theses/384

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


Brno University of Technology

2. Fodor, Ján. Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis.

Degree: 2018, Brno University of Technology

Thesis deals with determination of layerwise mechanical properties of composite ceramics by indirect method, namely Youngs modulus. Based on literature review, it was found that a method to determine elastic properties of one or more components of multi layered composites based on experimental modal analysis and finite element modal analysis, or analytical approach exists. Method based on FE modal analysis was applied to ceramic laminate, where it was attempt to determine youngs modulus of one component. Beyond that, it was attempt to determine Youngs moduli of both components using first two bending resonant frequencies. Results were unsatisfying. Sensitivity analysis showed that layers with unknown Youngs modulus were overly sensitive to small changes in input parameters due to their small relative thickness with respect to thickness of laminate and due to location in laminate. Based on this conclusion, recommendations were made with respect to suitable geometry of test specimens. Advisors/Committee Members: Ševeček, Oldřich (advisor), Lošák, Petr (referee).

Subjects/Keywords: AMZ; ATZ; experimentálna modálna analýza; keramický laminát; MKP; modálna analýza; metóda postupných lineárnych aproximácií; zvuková rezonancia; AMZ; ATZ; ceramic laminate; experimental modal analysis; FEA; finite element model updating; modal analysis; sonic resonance; impulse excitation technique

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

APA (6th Edition):

Fodor, J. (2018). Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/65979

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

Chicago Manual of Style (16th Edition):

Fodor, Ján. “Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis.” 2018. Thesis, Brno University of Technology. Accessed November 23, 2020. http://hdl.handle.net/11012/65979.

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

MLA Handbook (7th Edition):

Fodor, Ján. “Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis.” 2018. Web. 23 Nov 2020.

Vancouver:

Fodor J. Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2020 Nov 23]. Available from: http://hdl.handle.net/11012/65979.

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

Council of Science Editors:

Fodor J. Určování mechanických charakteristik materiálů vícevrstvých struktur s využitím metody zvukové rezonance a modální MKP analýzy: Determination of the mechanical properties of the multilayer structure materials with utilization of the sonic resonance method and modal FE analysis. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/65979

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


Brno University of Technology

3. Rozsypalová, Iva. Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete.

Degree: 2018, Brno University of Technology

The thesis deals with a comparison of the selected strength tension properties of the hardened concrete and finding relationships between them. This is essentially a simple tensile strength, tensile flexural strength and tensile splitting strength. The text describe the testing procedures to determine the tensile strength of concrete. Furthermore, there are presented the results of testing on different types of concrete (plain concrete, lightweight concrete, steel-fiber concrete, polymer-fibre concrete and high strength concrete). The conclusion deals with the derivation of dependancy between concrete strengths and comparing the values obtained from the available relations with the results of the tests. Advisors/Committee Members: Daněk, Petr (advisor), Žítt, Petr (referee).

Subjects/Keywords: beton; tah; pevnost v prostém tahu; pevnost v příčném tahu; pevnost v tahu za ohybu; pevnost v tlaku; zkoušení betonu; vlastnosti betonu; modul pružnosti; modul přetvárnosti; ultrazvuková impulzová metoda; rezonanční metoda; porovnání pevností; závislost pevností; concrete; tension; tensile strenght; tensile splitting strength; flexural strength; compressive strength; concrete testing; characteristics of concrete; elastic modulus; staticYoung'smodulus; impulse excitation technique; rezonance method; tension comparing; tension relations

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Rozsypalová, I. (2018). Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/28690

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

Chicago Manual of Style (16th Edition):

Rozsypalová, Iva. “Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete.” 2018. Thesis, Brno University of Technology. Accessed November 23, 2020. http://hdl.handle.net/11012/28690.

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

MLA Handbook (7th Edition):

Rozsypalová, Iva. “Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete.” 2018. Web. 23 Nov 2020.

Vancouver:

Rozsypalová I. Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2020 Nov 23]. Available from: http://hdl.handle.net/11012/28690.

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

Council of Science Editors:

Rozsypalová I. Srovnání vybraných pevnostních tahových parametrů betonů: Comparison of selected parameters of tensile strength of concrete. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/28690

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

.