You searched for subject:(Applied Mechanics).
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The University of Alabama
1.
Cao, Zhiyi.
Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens.
Degree: 2010, The University of Alabama
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1482083 
► In this thesis, high strain rate properties of isotropic material (a copper alloy) and anisotropic material (2195-T8 aluminum-lithium alloy) are investigated using Taylor impact…
(more)
▼ In this thesis, high strain rate properties of isotropic material (a copper alloy) and anisotropic material (2195-T8 aluminum-lithium alloy) are investigated using Taylor impact tests. Coordinate measuring machines (CMMs) are used to measure the shape of specimens after the deformation. The geometrical data enables us to determine the plastic distributions and the dynamic yield stresses of specimens. A raise in yield strength is found in the copper alloy during the impact. It means that material properties of the copper alloy are sensitive to high strain rate. Yet such phenomenon is not found in the 2195-T8 aluminum-lithium alloy. Based on the uniaxial compression strain state in the barreling regions of the specimens, the dynamic yield stresses in the rolling, transverse and short transverse directions are obtained for the 2195-T8 aluminum-lithium alloy. This enables us to determine the anisotropic coefficients in Hill’s criterion and carry out the finite element analysis. The dependencies of fracture are also investigated. It is found that the fracture is sensitive to maximum shear stress, equivalent plastic strain and stress triaxiality.
Subjects/Keywords: Applied Mechanics
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APA (6th Edition):
Cao, Z. (2010). Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens. (Thesis). The University of Alabama. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1482083
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):
Cao, Zhiyi. “Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens.” 2010. Thesis, The University of Alabama. Accessed February 26, 2020.
http://pqdtopen.proquest.com/#viewpdf?dispub=1482083.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cao, Zhiyi. “Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens.” 2010. Web. 26 Feb 2020.
Vancouver:
Cao Z. Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens. [Internet] [Thesis]. The University of Alabama; 2010. [cited 2020 Feb 26].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1482083.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cao Z. Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens. [Thesis]. The University of Alabama; 2010. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1482083
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The Ohio State University
2.
Mokashi, Prasad Shrikant.
Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws.
Degree: PhD, Mechanical Engineering, 2007, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1180621217
► This dissertation investigates problems that involve the cohesive response at a crack tip in a homogeneous material, at a crack tip in a bimaterial interface,…
(more)
▼ This dissertation investigates problems that involve
the cohesive response at a crack tip in a homogeneous material, at
a crack tip in a bimaterial interface, and an investigation of the
cohesive response of an interface. The first investigation outlines
a methodology for computing the non-linear generalized
load-displacement response of an edge-cracked beam shaped element
with a softening crack-plane cohesive zone intended for use in
various possible techniques of nondestructive characterization of
cohesive material properties using the vibration properties. The
cracked beam shaped geometry is divided into two bodies which
interact across the crack plane through appropriate boundary
conditions and each body is loaded by a bending couple away from
the crack plane. The direct boundary element method (BEM) is
applied to each body and an iterative scheme is used to determine
the extent of the cohesive zone. The J-integral associated with the
single crack tip is then calculated from the BEM crack plane
tractions and displacements and is used to numerically evaluate the
generalized non-linear load-displacement relations. The second
investigation outlines a novel approach to numerically model a
Dugdale-Barenblatt cohesive zone at an interface crack between two
dissimilar materials. The direct BEM approach is once again used
here to appropriately apply the constraints in the cohesive zone
and obtain a physically meaningful solution for tractions and
displacements in the crack plane. This approach provides a
heretofore unavailable convenient method for calculating the local
crack tip mode mixity, the total energy release rate, and its
decomposition into the separate mode contributions as a function of
the
applied mode mixity and material mismatch. The third
investigation concerns the dispersion relations for time-harmonic
guided waves in a layer connected to a rigid substrate by a very
thin interface layer of material with nonlinear and softening
behavior. The interfacial spring stiffness which, is directly
included in the dynamic layer boundary conditions, may be
interpreted as the local slope of the cohesive law at the static
pre-load level. The spring stiffnesses inferred from the dispersion
relations from a series of measurements taken at multiple pre-load
levels could then be integrated to obtain the cohesive
law.
Advisors/Committee Members: Mendelsohn, Daniel (Advisor).
Subjects/Keywords: Applied Mechanics
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APA (6th Edition):
Mokashi, P. S. (2007). Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1180621217
Chicago Manual of Style (16th Edition):
Mokashi, Prasad Shrikant. “Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws.” 2007. Doctoral Dissertation, The Ohio State University. Accessed February 26, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1180621217.
MLA Handbook (7th Edition):
Mokashi, Prasad Shrikant. “Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws.” 2007. Web. 26 Feb 2020.
Vancouver:
Mokashi PS. Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws. [Internet] [Doctoral dissertation]. The Ohio State University; 2007. [cited 2020 Feb 26].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1180621217.
Council of Science Editors:
Mokashi PS. Numerical modeling of homogeneous and bimaterial crack tip
and interfacial cohesive zones with various traction-displacement
laws. [Doctoral Dissertation]. The Ohio State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1180621217
Harvard University
3.
Connolly, Fionnuala Patricia.
Mathematical Models for Guiding Pneumatic Soft Actuator Design.
Degree: PhD, 2018, Harvard University
URL: http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050116
► Soft actuators are the components responsible for producing motion in soft robots. Although soft actuators have facilitated a variety of innovative applications of soft robots,…
(more)
▼ Soft actuators are the components responsible for producing motion in soft robots. Although soft actuators have facilitated a variety of innovative applications of soft robots, there is a need for design tools that can help to efficiently and systematically design actuators for particular functions. Mathematical modeling can provide quantitative insights into the response of soft actuators. These insights can be used to guide actuator design, thus accelerating the design process.
By performing finite element simulations of fiber-reinforced soft actuators, I quantify the relationship between the fiber angle of the actuators and their deformation as a function of inflation pressure. I then verify the simulation results by experimentally characterizing the actuators. By combining actuator segments in series, combinations of motions tailored to specific tasks can be achieved. I demonstrate this by using the results of simulations of separate actuators to design a segmented wormlike soft device, capable of propelling itself through a tube and performing an orientation-specific peg insertion task at the end of the tube.
Following on from this work, I then use nonlinear elasticity theory to develop analytical models of fiber-reinforced soft actuators. I present a design strategy that takes a kinematic trajectory as its input and uses the analytical models, together with optimization, to identify the optimal design parameters for an actuator that will follow this trajectory upon pressurization. I experimentally verify my modeling approach and demonstrate how the strategy works, by designing actuators that replicate the motion of the index finger and thumb.
Finally, I study a newer type of pneumatic soft actuator, made from textiles. Textiles are promising materials for soft actuators, as they are lightweight, conformable, stretchable, and intrinsically anisotropic. I perform mechanical characterization to identify textiles which have the properties necessary to produce a bending actuator. I then describe a layered lamination manufacturing approach, which allows us to quickly and easily coat textiles to make them air-impermeable, and seal them together to form an airtight pocket. I present a mathematical model of the actuators and use this model to design actuators for an assistive glove.
Engineering and Applied Sciences - Applied Math
soft actuators, fiber-reinforced, textiles, modeling
Advisors/Committee Members: Walsh, Conor (advisor), Howe, Robert (committee member), Kuindersma, Scott (committee member).
Subjects/Keywords: Applied Mechanics
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APA (6th Edition):
Connolly, F. P. (2018). Mathematical Models for Guiding Pneumatic Soft Actuator Design. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050116
Chicago Manual of Style (16th Edition):
Connolly, Fionnuala Patricia. “Mathematical Models for Guiding Pneumatic Soft Actuator Design.” 2018. Doctoral Dissertation, Harvard University. Accessed February 26, 2020.
http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050116.
MLA Handbook (7th Edition):
Connolly, Fionnuala Patricia. “Mathematical Models for Guiding Pneumatic Soft Actuator Design.” 2018. Web. 26 Feb 2020.
Vancouver:
Connolly FP. Mathematical Models for Guiding Pneumatic Soft Actuator Design. [Internet] [Doctoral dissertation]. Harvard University; 2018. [cited 2020 Feb 26].
Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050116.
Council of Science Editors:
Connolly FP. Mathematical Models for Guiding Pneumatic Soft Actuator Design. [Doctoral Dissertation]. Harvard University; 2018. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:40050116
McGill University
4.
Baig, Zubair.
Functional mechanical assessment of foot and ankle stiffness and work production in ice hockey skate boots.
Degree: MS, Department of Kinesiology and Physical Education, 2011, McGill University
URL: http://digitool.library.mcgill.ca/thesisfile97258.pdf
► Ice hockey is a sport characterized by high speeds, sharp turns and abrupt stops. As a result of these explosive and agile movements, the interaction…
(more)
▼ Ice hockey is a sport characterized by high speeds, sharp turns and abrupt stops. As a result of these explosive and agile movements, the interaction of the foot and ankle with the skate boot is fundamental for optimal stability and propulsion. The purpose of this study was to determine the nature of this mechanical coupling in both a conventional and prototype skate models. In phase one, a Biodex System 4 Pro dynamometer was used to isolate the foot and ankle / boot dynamics in sagittal and frontal plane movements. Three footwear conditions were evaluated (control shoe, a skate boot in production and a modified skate boot prototype). In phase two, lower body kinematics were assessed using 3D motion capture to determine if the above skate models would yield different joint movement coordination during skating push-offs using the two skate boot models. When comparing the three foot conditions, there was a significantly greater range of motion observed in the shoe control and modified skate boot than the regular skate boot (65.2 deg vs. 52.4 deg vs. 35.7 deg, p < 0.05). The total work done was only significant in the shoe control over the regular skate boot (16 kJ vs. 8.9 kJ, p < 0.05). In phase two, only the maximum plantar flexion was greater with the modified skate (11.3 deg vs. 1.3 deg, p < 0.05). The biodex dynamometer was able to discern differences between the three types of footwear using the dependent variables selected. Using a combination of the active and passive modes, this system has provided a valuable measurement of quantifying boot stiffness characteristics.
Une vitesse de jeu rapide, les virages brusques ainsi que les arrêts soudains sont des caractéristiques bien particulières au hockey sur glace. Considérant ces mouvements explosifs et agiles, l'interaction entre le pied, la cheville ainsi que la botte du patin devient fondamentale pour obtenir une propulsion et une stabilité optimale. Le but de cette études était de déterminer la nature cette interaction mécanique pour un modèle de patin a glace conventionnel ainsi que pour un prototype. Dans un premier temps, un dynamomètre Biodex System 4 a été utilisé pour isoler de façon dynamique le pied et la cheville/patin dans les plans sagittal et frontal. Trois conditions expérimentales ont été évaluées (soulier contrôle, patin commercialisé ainsi qu'un patin modifié). Par la suite, la cinématique des membres inférieurs fut mesurée en utilisant une système de capture du mouvement pour déterminer si les différentes botte de patin affecteraient la coordination motrice lors d'un départ.En comparant les trois conditions de botte, une différence significative a été observée pour l'amplitude de mouvement entre le soulier et le patin modifié et le patin commercial (65.2° vs. 52.4° vs. 35.7°, p < 0.05). Le travail total était seulement significatif entre le soulier et le patin commercial (16 kJ vs 8.9 kJ, p < 0.05). Pour la deuxième phase, seulement la flexion plantaire maximale était plus grande avec le patin modifié 11.3° vs. 1.3°, p < 0.05).Le…
Advisors/Committee Members: David J Pearsall (Internal/Supervisor).
Subjects/Keywords: Applied Sciences - Applied Mechanics
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McGill University
5.
Fortier, Antoine.
Skating mechanics of change of direction maneuvers in hockey players.
Degree: MS, Department of Kinesiology and Physical Education, 2011, McGill University
URL: http://digitool.library.mcgill.ca/thesisfile97042.pdf
► Ice hockey is a popular winter sport that involves many skating skills improved by coaching instruction and numerous hours of practice. Once the basic mechanics…
(more)
▼ Ice hockey is a popular winter sport that involves many skating skills improved by coaching instruction and numerous hours of practice. Once the basic mechanics of skating have been honed, the open game context requires rapid skating transitions between skating skills so as to effectively navigate about the ice surface to evade opponents and move in strategic tandem with teammates. Consequently, a player's performance relates in large part to effective change of direction maneuvers. The purpose of this study was to observe the kinetics of change of direction maneuvers in hockey players while wearing one of two skate models: a conventional skate and a skate with enhanced ankle mobility. Eight subjects with competitive ice hockey playing experience performed 90º change of direction tasks both to their left and then right sides for both skate models. Kinetic data were collected using a portable acquisition device connected to force strain gauge transducers on the blade holder. During a change of direction maneuver, a significant difference in the force applied by the inside and outside skates was noted (p < 0.05). No significant differences were observed as a main effect for skate model and turn direction. Significant differences were noted when leg side (inside/outside) was compared with skate model or turn direction (p< 0.05). This can provide insight to ice hockey coaches for training and skill development purposes but also to ice hockey skate manufacturers for future directions related to injury prevention and skating performance.
Étant un sport d'hiver populaire, l'hockey sur glace englobe plusieurs tâches de patinage qui sont améliorées par l'enseignement des entraîneurs accompagné de plusieurs heures de pratique. Une fois que les bases du patinage sont maîtrisées, le contexte du jeu ouvert requière des habilitées de transition rapide à travers les aptitudes de patinage pour naviguer effectivement sur la surface glacée afin d'évader les adversaires et se déplacer de manière stratégique avec les coéquipiers. Par conséquence, la performance d'un joueur est largement reliée aux mouvements de changement de direction. L'objectif de cette étude est d'observer la kinétique des mouvements de changement de direction de joueurs d'hockey en portant soit un patin conventionnel ou un patin avec une plus grande mobilité à la cheville. Huit sujets avec de l'expérience compétitive d'hockey on performés des mouvements de changement de direction de 90º à gauche et a droite pour les deux type de patins utilises. Des données kinétiques on été collectées en utilisant un système portable d'acquisition de données connecté à des jauges de déformation situés entre la lame et la botte du patin. Durant un mouvement de changement de direction, une différence significative a été observée au niveau de la distribution du poids entre la jambe extérieure et intérieure (p > 0.05). Aucune différence significative n'a été notée pour les deux modèles de patin ou par rapport à la direction du virage. Des différences significatives ont été…
Advisors/Committee Members: David Pearsall (Internal/Supervisor).
Subjects/Keywords: Applied Sciences - Applied Mechanics
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McGill University
6.
Ouckama, Ryan.
Time series measurement of force distribution in ice hockey helmets during varying impact conditions.
Degree: PhD, Department of Kinesiology and Physical Education, 2013, McGill University
URL: http://digitool.library.mcgill.ca/thesisfile119435.pdf
► Modern sport helmets have been effective in reducing catastrophic head injuries such as skull fracture and subdural hematoma; yet, the high prevalence of minor traumatic…
(more)
▼ Modern sport helmets have been effective in reducing catastrophic head injuries such as skull fracture and subdural hematoma; yet, the high prevalence of minor traumatic brain injuries (mTBI) is an unresolved public health concern. Consequently, there is a need for greater scrutiny in a helmet's ability to mitigate collision forces that may correspond to mTBI risk. Current safety standards primarily assess a helmet's ability to minimize the whole head's peak acceleration during blunt impacts. Absent are dynamic measures local to the impact site itself due to the technical challenge to spatial map high impact force magnitudes with high temporal resolution. Inclusion of the latter measures may enhance the functional assessment of helmets. Thus, the aim of this research was to develop a localized impact mapping system (LIMS) for placement between the helmet and head interface and then to utilize the LIMS to evaluate the mechanical behaviour of various padding foams and helmets during controlled headform drop and projectile collision tests. Interposed between the helmet shell/padding and head surface, this LIMS consists of an array of discrete, thin force sensors connected to a compact signal conditioner and high speed data acquisition digital recorder. A first study demonstrated the feasibility of the LIMS to accurately capture impact events in terms of both force magnitude and temporal response. The results of this initial study demonstrated that the system could capture impact forces with acceptable error (~5%) and high correlation (0.97) between measures of global force and the sensor array. Furthermore, the LIMS demonstrated the ability to capture impact "footprints" that functionally differentiated material properties of density and temperature. A second study incorporated the LIMS as part of a standard controlled surrogate headform drop test for blunt impacts. The LIMS performed equally well on the curved cranial surface geometry of the headform and was able to differentiate unique impact contact distribution patterns based on the ice hockey helmet model's shell and padding configurations, including identification of high focal force concentrations (>16 MPa) during side impact. Of note, global head impact acceleration measures did not correspond to the magnitude of localized contact forces (R-square=0.22), but did correspond to net global contact force (R-square=0.98). A third study used the LIMS between a Hybrid III surrogate headform and an ice hockey helmet during controlled puck projectile collisions. The LIMS was effective at capturing local force distributions dynamics for short impact events lasting 2-4 ms, and again was able to distinguish between varied helmet model's padding materials and installed configurations. Five helmet models were
subject to highly localized puck impact at two different velocities (V1=24.2 m/s, V2=33.3 m/s). At V2, peak contact pressures, averaged across all helmet models, were nearly double (393 N/cm
2) those recorded at the same location during vertical drop testing (201…
Advisors/Committee Members: David J Pearsall (Supervisor).
Subjects/Keywords: Applied Sciences - Applied Mechanics
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The University of Arizona
7.
Jenkins, Robert M.
Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data.
Degree: 2009, The University of Arizona
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3369202
► The small dispersion limit of the focusing nonlinear Schroödinger equation (fNLS) exhibits a rich structure with rapid oscillations at microscopic scales. Due to the…
(more)
▼ The small dispersion limit of the focusing nonlinear Schroödinger equation (fNLS) exhibits a rich structure with rapid oscillations at microscopic scales. Due to the non self-adjoint scattering problem associated to fNLS, very few rigorous results exist in the semiclassical limit. The asymptotics for reflectionless WKB-like initial data was worked out in [KMM03] and for the family <i>q</i>(<i>x,</i> 0) = [special characters omitted] in [TVZ04]. In both studies the authors observed sharp breaking curves in the space-time separating regions with disparate asymptotic behaviors. In this paper we consider another exactly solvable family of initial data, specifically the family of centered square pulses, <i>q</i>(<i> x,</i> 0) = <i>q</i>χ<sub>[−</sub><i>L,L </i>] for real amplitudes <i>q.</i> Using Riemann-Hilbert techniques we obtain rigorous pointwise asymptotics for the semiclassical limit of fNLS globally in space and up to an [special characters omitted](1) maximal time. In particular, we find breaking curves emerging in accord with the previous studies. Finally, we show that the discontinuities in our initial data regularize by the immediate generation of genus one oscillations emitted into the support of the initial data. This is the first case in which the genus structure of the semiclassical asymptotics for fNLS have been calculated for non-analytic initial data.
Subjects/Keywords: Applied Mechanics; Mathematics
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Jenkins, R. M. (2009). Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data. (Thesis). The University of Arizona. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3369202
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):
Jenkins, Robert M. “Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data.” 2009. Thesis, The University of Arizona. Accessed February 26, 2020.
http://pqdtopen.proquest.com/#viewpdf?dispub=3369202.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jenkins, Robert M. “Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data.” 2009. Web. 26 Feb 2020.
Vancouver:
Jenkins RM. Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data. [Internet] [Thesis]. The University of Arizona; 2009. [cited 2020 Feb 26].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3369202.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jenkins RM. Semiclassical asymptotics of the focusing nonlinear Schrodinger equation for square barrier initial data. [Thesis]. The University of Arizona; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3369202
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Smith, Bryan G.
The eXtended Finite Element Method for special problems with moving interfaces.
Degree: 2009, Northwestern University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3331158
► Problems involving irregularly shaped domains or embedded interfaces occur in a wide range of mathematical models. These include models in computational biology, fluid mechanics,…
(more)
▼ Problems involving irregularly shaped domains or embedded interfaces occur in a wide range of mathematical models. These include models in computational biology, fluid mechanics, and solidification. Numerical solutions for this type of problem can be difficult to obtain, and therefore a variety of methods have been devised to solve them. One method that has been shown to perform well in comparison with other methods is the eXtended Finite Element Method (X-FEM). In this thesis, a variety of modifications are made to the X-FEM in order to apply it to problems with special interfacial features. First, a custom enrichment function is shown to increase the accuracy of the X-FEM for a problem containing a boundary layer at an internal interface. This technique is then applied to the problem of biofilm growth in order to explore the relationship between the shape of a biofilm colony and the profile of its growth. Next, the X-FEM is applied to film thinning in foam dynamics, and we present a method for solving the Stokes equations while accounting for surface tension along a free surface. Finally, we extend the model for film thinning to include a solidification front. The process of foam solidification is challenging to model computationally due to the presence of a triple junction where the solidification front intersects the gas-liquid interface. We propose two procedures for determining the subgrid location of the triple junction and demonstrate how to properly prescribe boundary conditions along each interface. This method is then applied to a simplified model for foam solidification in order to generate some preliminary results.
Subjects/Keywords: Applied Mechanics; Mathematics
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APA ·
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MLA ·
Vancouver ·
CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smith, B. G. (2009). The eXtended Finite Element Method for special problems with moving interfaces. (Thesis). Northwestern University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3331158
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):
Smith, Bryan G. “The eXtended Finite Element Method for special problems with moving interfaces.” 2009. Thesis, Northwestern University. Accessed February 26, 2020.
http://pqdtopen.proquest.com/#viewpdf?dispub=3331158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Bryan G. “The eXtended Finite Element Method for special problems with moving interfaces.” 2009. Web. 26 Feb 2020.
Vancouver:
Smith BG. The eXtended Finite Element Method for special problems with moving interfaces. [Internet] [Thesis]. Northwestern University; 2009. [cited 2020 Feb 26].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3331158.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith BG. The eXtended Finite Element Method for special problems with moving interfaces. [Thesis]. Northwestern University; 2009. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3331158
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
9.
Salleh, Mariam.
Comparison of rhombic type micromixer to improve mixing efficiency in biomems application.
Degree: Fakulti Kejuruteraan Elektrik dan Elektronik, 2013, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/4702/
► The term lab on chip and micro total analysis system stand synonymous for devices that require handling and processing of small amount of fluid to…
(more)
▼ The term lab on chip and micro total analysis system stand synonymous for devices that require handling and processing of small amount of fluid to perform function such as sample preparation, separation, biosensing and detection. Constraint due to the long mixing channel and miniaturized in size but efficiently mixed between fluids. In this project, the three types of rhombic geometry design were studied to characterize mixing performance between the blood sample and reagents. Pure rhombic, branch rhombic and slanted groove rhombic glass based micromixer were proposed to study the mixing performance. The simulation was obtained using CoventorWare 2010. The laminar mixing between blood sample and reagent was simulated at low Reynolds number flow (Re <<1). Reagents used are toluene-low viscosity reagent and carbolic acid- higher viscosity reagent in comparison to blood. The mixing characterization will be optimized based on visualization result of the distribution field in term of viscosity. Image standard deviation (σ) is used to characterize fluid mixing; the lower σ, the better in fluids mixing properties. From this study, it was found that slanted groove rhombic gained the highest mixing efficiency followed by pure rhombic and branch rhombic. This is because grooves structure can improve surface contact area thus stretch and folds the laminar flows.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Salleh, M. (2013). Comparison of rhombic type micromixer to improve mixing efficiency in biomems application. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/4702/
Chicago Manual of Style (16th Edition):
Salleh, Mariam. “Comparison of rhombic type micromixer to improve mixing efficiency in biomems application.” 2013. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/4702/.
MLA Handbook (7th Edition):
Salleh, Mariam. “Comparison of rhombic type micromixer to improve mixing efficiency in biomems application.” 2013. Web. 26 Feb 2020.
Vancouver:
Salleh M. Comparison of rhombic type micromixer to improve mixing efficiency in biomems application. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2013. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/4702/.
Council of Science Editors:
Salleh M. Comparison of rhombic type micromixer to improve mixing efficiency in biomems application. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2013. Available from: http://eprints.uthm.edu.my/4702/
10.
Abdul Rahim, Suraya.
Design and development of groove micromixer for laminar blood-reagent mixing.
Degree: Fakulti Kejuruteraan Elektrik dan Elektronik, 2013, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/4746/
► Mixing of two fluids is an essential process for most of microfluidic device for Biomedical Micro-Electro-Mechanical System (Bio-MEMS) application. Mixing also important in Lab-On-Chip (LOC)…
(more)
▼ Mixing of two fluids is an essential process for most of microfluidic device
for Biomedical Micro-Electro-Mechanical System (Bio-MEMS) application. Mixing
also important in Lab-On-Chip (LOC) system because the chemical reaction carried
out in this system requires on-chip mixing. Mixing performance in this system relies
mainly on effective and rapid mixing of sample and reagent. Therefore, development
of groove micromixer for application of blood and reagent mixing carried out in this
project. In this study, two fluids involve in the mixing, which is the blood and
reagent (two type of reagent with lower and higher viscosity compared to blood).
Two pattern of the groove namely oblique groove and herringbone groove were
designed and simulated using CoventorWare2010 software at low Reynolds number.
The design of groove micromixer obtained by analyzing the geometries effect of
groove pattern on mixing performance of blood and reagent with the visualization of
simulation and evaluation of mixing performance for difference geometry parameter
of groove micromixer. In this study, it has been demonstrated that the Y-Shape mixer
with the groove structure located at the floor of the mixing channel increased the
mixing performance. Thus, the simulation result in this study shows that mixing
performance can be enhanced when depth and width of groove is 40% of the channel
width with the angle of an oblique groove is 45º. Whereas for the herringbone mixer,
enhancement of mixing performance occured when the depth and width of
herringbone groove is 25% of the channel width with the approximation of
asymmetric index is quarter of the width of mixing channel.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Abdul Rahim, S. (2013). Design and development of groove micromixer for laminar blood-reagent mixing. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/4746/
Chicago Manual of Style (16th Edition):
Abdul Rahim, Suraya. “Design and development of groove micromixer for laminar blood-reagent mixing.” 2013. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/4746/.
MLA Handbook (7th Edition):
Abdul Rahim, Suraya. “Design and development of groove micromixer for laminar blood-reagent mixing.” 2013. Web. 26 Feb 2020.
Vancouver:
Abdul Rahim S. Design and development of groove micromixer for laminar blood-reagent mixing. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2013. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/4746/.
Council of Science Editors:
Abdul Rahim S. Design and development of groove micromixer for laminar blood-reagent mixing. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2013. Available from: http://eprints.uthm.edu.my/4746/
11.
Zaman @ Bujang, Izzuddin; Ali, Yaacub Zaki.
Vibration control of structure using multiple passive vibration absorbers.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2012, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/6900/
► Vibrations are undesired phenomenon in mechanical structures. It can cause damage, discomfort, destruction and disturbance of the system or the structure. In this study, the…
(more)
▼ Vibrations are undesired phenomenon in mechanical structures. It can cause damage,
discomfort, destruction and disturbance of the system or the structure. In this study,
the application of passive vibration absorber is investigated and its effectiveness are
further researched by comparing the use of single and multiple absorber for the structural
vibration control. The vibration absorber system is designed to minimize the
vibration amplitude of a simply-supported beam and a simply-supported plate. The
beam and plate's vibration characteristic, such as natural frequency and mode shape
are determined using three approaches: experimental testing, analytical equations and
finite element analysis. In the initial stage, a finite element simulation study is conducted
using Ansysm to validate the analytical equations of Matlab and experimental
results of a simply-supported beam and a simply-supported plate. The preliminary result
indicates that the first four natural frequencies of a simply-supported beam and a
simply-supported plate are well-correlated between finite element, analytical and experiment
results. Later the research works are further performed with attached single
and multiple vibration absorbers. The result shows that multiple vibration absorber
produced better results compare to single vibration absorber attachment in reducing
the structural's resonance amplitude. The outcomes of overall global vibration reduction
for multiple absorber is 9 times while single absorber is only 6 times. In the end,
we can conclude that multiple vibration absorber is more effective and shows better
result in reducing the resonance vibration of the structure.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Zaman @ Bujang, Izzuddin; Ali, Y. Z. (2012). Vibration control of structure using multiple passive vibration absorbers. (Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/6900/
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):
Zaman @ Bujang, Izzuddin; Ali, Yaacub Zaki. “Vibration control of structure using multiple passive vibration absorbers.” 2012. Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/6900/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zaman @ Bujang, Izzuddin; Ali, Yaacub Zaki. “Vibration control of structure using multiple passive vibration absorbers.” 2012. Web. 26 Feb 2020.
Vancouver:
Zaman @ Bujang, Izzuddin; Ali YZ. Vibration control of structure using multiple passive vibration absorbers. [Internet] [Thesis]. Universiti Tun Hussein Onn Malaysia; 2012. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/6900/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zaman @ Bujang, Izzuddin; Ali YZ. Vibration control of structure using multiple passive vibration absorbers. [Thesis]. Universiti Tun Hussein Onn Malaysia; 2012. Available from: http://eprints.uthm.edu.my/6900/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Idris, Mohd Azli.
Vibration simulation of a simply-supported beam with attached multiple absorbers.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7544/
► In general, the standard solutions to reduce the vibration and noise problems are to redesign and modify the system such as adding the thickness of…
(more)
▼ In general, the standard solutions to reduce the vibration and noise problems are to
redesign and modify the system such as adding the thickness of wall panels, enhancing
the elasticity of the structure and increase the damping mechanism of the structure. In
this study, the concept of dynamic vibration absorber is used on a beam structure to reduce
the vibration or amplitude. The methods employed in this study were analytical
equations and finite element analysis. MATLAB® was used to transform analytical
equations into graphs and at the same time to verify the finite element simulation of
ANSYS®. Result shows that analytical equation and finite element simulation of a
simply supported beam produce a similar outcome, which indicates a good agreement.
The frequency range was studied between 5 Hz to 1000 Hz and there are four modes
resulting shape. Further study was conducted by placing the absorber at different locations
configuration. This was followed by adding a single absorber and multiple
absorbers to see the average percentage reduction in vibration’s amplitude. The overall
reduction achieved for multiple absorbers is 88.6% compared to a single absorber
which only achieved 8.21% reduction. Finally, it can be concluded that multiple vibration
absorber can be reduce the global vibration of structure compared to a single
vibration absorber. However, for the structures that concern about weight, adding more
dynamic vibration absorber needs to be considered properly since excess weight will
result in less fuel efficiency of vehicles, aerospace, automotive and machine systems.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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MLA ·
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CSE |
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Manager
APA (6th Edition):
Idris, M. A. (2015). Vibration simulation of a simply-supported beam with attached multiple absorbers. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7544/
Chicago Manual of Style (16th Edition):
Idris, Mohd Azli. “Vibration simulation of a simply-supported beam with attached multiple absorbers.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7544/.
MLA Handbook (7th Edition):
Idris, Mohd Azli. “Vibration simulation of a simply-supported beam with attached multiple absorbers.” 2015. Web. 26 Feb 2020.
Vancouver:
Idris MA. Vibration simulation of a simply-supported beam with attached multiple absorbers. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7544/.
Council of Science Editors:
Idris MA. Vibration simulation of a simply-supported beam with attached multiple absorbers. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7544/
13.
Mohd Noh, Mohd Firdaus.
Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7547/
► Generally, solutions to improve the vibration and noise problems are to redesign or modify the system such as increasing the thickness of the wall panels,…
(more)
▼ Generally, solutions to improve the vibration and noise problems are to redesign or
modify the system such as increasing the thickness of the wall panels, enhancing the
elasticity of the structure, and increase the damping mechanism of the structure. In
this study, the application of vibroacoustic modelling of enclosure coupled to a flexible
wall was investigated and its effectiveness was further researched by attaching
single and multiple spring-mass-damper (SMD) system for the structural vibration
control and sound pressure attenuation. The SMD system is designed to minimize
the sound pressure amplitude of a flexible wall of a rigid walled enclosure. The sound
pressure characteristics of rigid walled enclosure, such as natural frequency and mode
shape were determined using two approaches which are simulation (ANSYS®) and
theoretical (MATLAB®). In the preliminary study, the theoretical equation derived in
MATLAB® such as rigid walled enclosure coupled to flexible wall and rigid walled
enclosure with attached SMD were used to validate finite element analysis (FEA) conducted
using ANSYS®. The result indicates that the theory and FEA showed in a good
agreement. Thus, proved that the FE model was accurate and can be applied in the
subsequent analysis. As the mass and damping of the SMD were changed, the sound
pressure of enclosure was also affected. The study showed that with attached SMD to
a flexible wall, the sound pressure of enclosure was dropped significantly. From these
result, single SMD with mass of 20 kg and damping coefficient of 10Ns/m provides the
best option. As the study extended to multiple SMDs attachment at different location
and configuration, the outcomes showed that the center point attachment on flexible
wall at coordinate (1,0.25,0.15) and the combination between location one, two, three
and four produce the highest reduction. Finally, it can be concluded that multiple
SMDs were able to reduce the sound pressure compared to single SMD. However, for
the structures that take weight into consideration, such as in aerospace, automotive and
machine system, adding numbers of SMDs will result excess weight to the structure,
thus reduce fuel efficiency.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohd Noh, M. F. (2015). Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7547/
Chicago Manual of Style (16th Edition):
Mohd Noh, Mohd Firdaus. “Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7547/.
MLA Handbook (7th Edition):
Mohd Noh, Mohd Firdaus. “Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system.” 2015. Web. 26 Feb 2020.
Vancouver:
Mohd Noh MF. Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7547/.
Council of Science Editors:
Mohd Noh MF. Vibroacoustic modelling of enclosure coupled to a flexible wall with attached spring-mass-damper system. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7547/
14.
Mat Jusoh, Noor Aslamiah.
Finite element analysis of a beam structure attached with tuned vibration absorbers.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7554/
► In this study, the concept of vibration dynamic absorbers used to analyze vibration of a beam structure where simulation has been done by ANSYS APDL.…
(more)
▼ In this study, the concept of vibration dynamic absorbers used to analyze vibration of a beam structure where simulation has been done by ANSYS APDL. The dynamic vibration absorbers were attached to the fixed-fixed end beam with four different conditions according to its location of placement. The beam modelled by ANSYS was divided into twenty elements. There are twenty one nodes on the beam and distance between nodes is 0.04m. The length of beam, L is 0.8m. The DVA was mounted at node 3 (side of the beam) and node 12 (center of the beam). This research is about the vibration characteristics of the fixed-fixed end beam and dynamic vibration absorbers when placed together and harmonic force,F0 exerted on the beam. The vibration amplitude of the beam structure without DVA and with attached DVAs were compared. The simulation results show amplitude at the natural frequency of beam was decrease close to zero and at the same time amplitude of DVAs were increased. The amplitude of the fixed-fixed end bean and DVAs can be observed significantly at graph were constructed. It is proved that the DVAs absorb vibration at the beam structure. The percentage of reduction for the beam amplitude based on location of DVAs that was placed at the beam.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mat Jusoh, N. A. (2015). Finite element analysis of a beam structure attached with tuned vibration absorbers. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7554/
Chicago Manual of Style (16th Edition):
Mat Jusoh, Noor Aslamiah. “Finite element analysis of a beam structure attached with tuned vibration absorbers.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7554/.
MLA Handbook (7th Edition):
Mat Jusoh, Noor Aslamiah. “Finite element analysis of a beam structure attached with tuned vibration absorbers.” 2015. Web. 26 Feb 2020.
Vancouver:
Mat Jusoh NA. Finite element analysis of a beam structure attached with tuned vibration absorbers. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7554/.
Council of Science Editors:
Mat Jusoh NA. Finite element analysis of a beam structure attached with tuned vibration absorbers. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7554/
15.
Abdul Rahman, Abdul Halim.
CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7694/
► Vortex-induced vibration is a vibration phenomenon which occurred to the bluff body structure either on the ground or sea underneath. The investigations of the effect…
(more)
▼ Vortex-induced vibration is a vibration phenomenon which occurred to the bluff
body structure either on the ground or sea underneath. The investigations of
the effect of flow velocity on the transverse vibration of bluff body were done
to determine the vortex shedding frequency for each of the analyses. Besides it
was also to investigate the flow velocity and pressure loss in the time response.
Despite the investigation made by other researchers, a study on a very high
turbulence Reynolds number, were still blurred unknown. In response to this
problem, this study is purposely to investigate at a very high Reynolds number
and simulated through ANSYS Fluent software’s which started from a minimum
of 70 000 Reynolds number and increased to the maximum of 350 000 Reynolds
number. A one meter in diameter of cylindrical aluminium was used for the
study where the velocity was in cross-flow direction. From the simulated results,
it could be seen the fluid flow after the boundary layer was an asymmetric flow.
The Strouhal number seems to be decreased by the increase of Reynolds number
while the frequencies were increased with the increased of Reynolds number.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Abdul Rahman, A. H. (2015). CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7694/
Chicago Manual of Style (16th Edition):
Abdul Rahman, Abdul Halim. “CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7694/.
MLA Handbook (7th Edition):
Abdul Rahman, Abdul Halim. “CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent.” 2015. Web. 26 Feb 2020.
Vancouver:
Abdul Rahman AH. CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7694/.
Council of Science Editors:
Abdul Rahman AH. CFD simulation of vortex-induced vibration of a bluff body structure by ANSYS fluent. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7694/
16.
Ghazali, Mohd Hafiz.
New design of tuned vibration absorber for wide frequency range application.
Degree: Faculty of Mechanical and Manufacturing Engineering, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7750/
► Vibrations are undesirable in machines and structures because they increased stresses, energy losses, cause added wear, increase bearing loads, induce fatigue, create passenger discomfort in…
(more)
▼ Vibrations are undesirable in machines and structures because they increased stresses, energy losses, cause added wear, increase bearing loads, induce fatigue, create passenger discomfort in vehicles. Uncontrolled vibrations can leave a bad impression to the machine, structure, and human. Vibration on machine can damage the equipment, decrease the machine lifetime and also causing the safety factor problems. In this research, a tuned vibration absorber (TVA) was chosen to be studied where the amount of vibration reduced was determined through finite element analysis (FEA) and validated with the experimental result. A actual scale of tuned vibration absorber was developed and applied on the structure to reduce the vibration. It is expected that by using the new design of tuned vibration absorber, the vibration of the structure can be reduced extensively. The objective of this project is to design and fabricate a newly tuned vibration absorber (TVA) that address a broad frequency range of application, light in weight, small-scale and suitable for mobile purposes. In order to achieve this aim, the preliminary design analysis was performed using finite element analysis before validated by experimental test. There are two design proposed in this study which is design 1 and design 2. The design concept was designed by using SolidWorks® and simulation test was done in this phase as well. From these two design, only one design was selected to be manufactured and tested. Design 1 was selected to be manufactured due to its performance in finite element analysis. DEWEsoft-201 were used as an equipment in experimental phase where the equipment will measure and generate graph data based on vibration performance. This experiment done several times according to the mass distance which is from 0 to 40 sequently. All the data were validated to ensure that the data from the finite element analysis and experimental are matched or even better. The data obtained shows good matched where the data gained are almost the same. The new vibration absorber has a weight of 620.6 kg and it is suitable for mobile purposes.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ghazali, M. H. (2015). New design of tuned vibration absorber for wide frequency range application. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7750/
Chicago Manual of Style (16th Edition):
Ghazali, Mohd Hafiz. “New design of tuned vibration absorber for wide frequency range application.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7750/.
MLA Handbook (7th Edition):
Ghazali, Mohd Hafiz. “New design of tuned vibration absorber for wide frequency range application.” 2015. Web. 26 Feb 2020.
Vancouver:
Ghazali MH. New design of tuned vibration absorber for wide frequency range application. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7750/.
Council of Science Editors:
Ghazali MH. New design of tuned vibration absorber for wide frequency range application. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7750/
17.
Mohd Noor, Nazihah.
Analysis of vortex shedding in a various body shapes.
Degree: Faculty of Mechanical and Manufacturing Engineering, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7790/
► The study of various bluff body shapes is important in order to identify the suitable shape of bluff body that can be used for vortex…
(more)
▼ The study of various bluff body shapes is important in order to identify the suitable
shape of bluff body that can be used for vortex flow meter applications. Numerical
simulations of bluff body shapes such as circular, rectangular and equilateral
triangular have been carried out to understand the phenomenon of vortex shedding.
The simulation applied
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mohd Noor, . N. (2015). Analysis of vortex shedding in a various body shapes. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7790/
Chicago Manual of Style (16th Edition):
Mohd Noor, Nazihah. “Analysis of vortex shedding in a various body shapes.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7790/.
MLA Handbook (7th Edition):
Mohd Noor, Nazihah. “Analysis of vortex shedding in a various body shapes.” 2015. Web. 26 Feb 2020.
Vancouver:
Mohd Noor N. Analysis of vortex shedding in a various body shapes. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7790/.
Council of Science Editors:
Mohd Noor N. Analysis of vortex shedding in a various body shapes. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7790/
18.
Kamardan, Muhamad Ghazali.
A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes.
Degree: PhD, Center for Graduate Studies, 2014, Universiti Pertahanan Nasional Malaysia
URL: http://eprints.uthm.edu.my/7797/
► The purpose of this research is to develop a general predictive mathematical model of the deformation behaviours for various symmetric geometrical tubes under lateral compression…
(more)
▼ The purpose of this research is to develop a general predictive mathematical model
of the deformation behaviours for various symmetric geometrical tubes under lateral
compression between two flat rigid plates. The mathematical model has been
proposed based on rigid, perfectly plastic model and the energy balance method. The
mathematical models are divided into two cases i.e. 'Case 1' and 'Case 2' based on the
geometrical shapes of the tubes. ‘Case 1’ is for shapes with number of sides 6, 10, 14
and so on such as hexagonal, decagonal and tetra-decagonal tubes. Whereas, ‘Case 2’
is for shapes with number of sides 4, 8, 12 and so on such as square, octagonal and
dodecagonal tubes. The prediction or assumption used in this mathematical model
was that the tubes would deform in phase by phase during plastic deformation. In
order to achieve this purpose, the deformation behaviour and the energy-absorption
performance of various geometrical tube shapes need to be determined. The
geometrical tubes shapes which were studied include square, hexagonal, octagonal,
decagonal, dodecagonal and tetra-decagonal tubes. For that, experimental tests and
finite element analysis (FEA) simulation were conducted to determine the collapse
behaviour of these various symmetrical geometric tubes. First, the quasi-static lateral
compression test was conducted on square and cylindrical tubes experimentally and
by FEA simulation method by using INSTRON Universal Testing Machine and
ABAQUS software respectively. Both results were compared to validate the FEA
simulation results. Then, the validated FEA simulation method was performed for
these various symmetrical geometric tubes to determine their deformation behaviour
iii
and energy-absorption performance and then to validate the newly mathematical model. The comparison between the experiment and FEA simulation had shown good agreement. The simulation study showed that square and symmetric hexagonal tubes deformed with 1 phase of plastic deformation, symmetric octagonal and decagonal tubes deformed with 2 phases of plastic deformation, symmetric dodecagonal and tetra-decagonal tubes deformed with 3 phases of plastic deformation. It was determined that, the general mathematical model had succeeded to predict the deformation behaviour of various symmetric geometrical shapes for both cases but discrepancy occurred for certain specimens due to sudden high peak at the last phase and small angle difference for neighbouring sides. The energy – absorption performance analyses for different types of symmetric geometrical tubes had shown that symmetric hexagonal tube produced the best energy-absorption with high total energy absorption, low yield stress and long stroke without any sudden jump force.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Kamardan, M. G. (2014). A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes. (Doctoral Dissertation). Universiti Pertahanan Nasional Malaysia. Retrieved from http://eprints.uthm.edu.my/7797/
Chicago Manual of Style (16th Edition):
Kamardan, Muhamad Ghazali. “A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes.” 2014. Doctoral Dissertation, Universiti Pertahanan Nasional Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7797/.
MLA Handbook (7th Edition):
Kamardan, Muhamad Ghazali. “A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes.” 2014. Web. 26 Feb 2020.
Vancouver:
Kamardan MG. A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes. [Internet] [Doctoral dissertation]. Universiti Pertahanan Nasional Malaysia; 2014. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7797/.
Council of Science Editors:
Kamardan MG. A mathematical model development for the quasi-static lateral collapse of the generalised geometric hollow shapes. [Doctoral Dissertation]. Universiti Pertahanan Nasional Malaysia; 2014. Available from: http://eprints.uthm.edu.my/7797/
19.
Md Hasan, Sazali.
Cfd simulation of the dynamic flow behavior in a bubble column reactor.
Degree: Faculty of Mechanical and Manufacturing Engineering, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/7839/
► In this project report an Eulerian two-phase Computational Fluid Dynamics (CFD) model for modelling bubble columns is presented. This model is able to predict the…
(more)
▼ In this project report an Eulerian two-phase Computational Fluid Dynamics (CFD) model for modelling bubble columns is presented. This model is able to predict the bubbly flow parameter such as gas holdup, contact surface area, air volume fraction, pressure drop, and velocity magnitude to understanding the hydrodynamic flow behaviors. Three types of gas distributor design are tested on the 1.5 m height and 0.15 m diameter bubble column cylinder. Five different velocities are used on the each gas distributor design in order to produces a variety flow pattern in the bubble column. The ANSYS Fluent Workbench 15.0 was used as the numerical solution to make the simulation analysis on the bubble column problems. In this simulation, gas (air) is dispersed through the gas distributor into liquid (water) in the bubble column to produces the bubbles rising along the cylinder. The graphically simulation result of gas holdup and velocity profile are compare to the previous simulation result similarly tendency in shape. Quite good agreement is obtained. It observed that by increasing the superficial gas velocity, gas holdup also increases and magnitude velocity will decreases when approached the wall. From the simulation result obtained, design “c” with larger holes diameter and open area ratio mostly given the highest value of gas holdup, contact surface area, air volume fraction and magnitude velocity compare to other design. The gas distributor holes sizing will be determined the size of bubble produces. The large bubble having more buoyancy force and rise velocity compare to small bubble.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Md Hasan, S. (2015). Cfd simulation of the dynamic flow behavior in a bubble column reactor. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/7839/
Chicago Manual of Style (16th Edition):
Md Hasan, Sazali. “Cfd simulation of the dynamic flow behavior in a bubble column reactor.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/7839/.
MLA Handbook (7th Edition):
Md Hasan, Sazali. “Cfd simulation of the dynamic flow behavior in a bubble column reactor.” 2015. Web. 26 Feb 2020.
Vancouver:
Md Hasan S. Cfd simulation of the dynamic flow behavior in a bubble column reactor. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/7839/.
Council of Science Editors:
Md Hasan S. Cfd simulation of the dynamic flow behavior in a bubble column reactor. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/7839/
20.
Mohamed Salleh, Mohammad.
Vibration control of thin plate structure with attached dynamic vibration absorbers.
Degree: Faculty of Mechanical and Manufacturing Engineering, 2016, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/8989/
► Vibration of a thin plate structure is one of a major concern in most engineering branches since it is the most widely used structural component…
(more)
▼ Vibration of a thin plate structure is one of a major concern in most engineering branches since it is the most widely used structural component in industrial applications, such as mechanical, electronic and civil structures. Thin plate structure exposed to vibration can lead to excessive deflections and eventually failure of the structure. The aim of this research is to investigate the effectiveness of using multiple dynamic vibration absorber for vibration control of a fixed-fixed thin plate. The vibration characteristics of thin plate are determined in the initial stage by using free vibration analysis. Two approaches are employed in the study: finite element analysis and experimental modal analysis. The preliminary results of finite element analysis demonstrate that the first five natural frequency of plate are 43Hz, 162Hz, 281Hz, 387Hz and 519Hz. These results are found corroborated well with the experiment, although there is a slight discrepancy in the first mode due to noise generated from inconsistent tapping during the impact hammer test. As it is planned to investigate the effectiveness of vibration absorber, a force vibration analysis of plate is carried out by using finite element method running in parallel with the experimental. Again, the simulation results of force vibration analysis are well validated with the experiment. Result shows that the average percentage reduction of plate attached with single vibration absorber is 84%. While when plate attached with dual dynamic vibration absorber, it provide a larger surpression of vibration amplitude which is about 94% at all frequency modes. From these results, it can be concluded that multiple vibration absorber can reduce the overall global structural vibration compared to a single absorber attachment. Nevertheless, the research reveals that the vibration absorber which designed in this study is significant in reducing the vibration. Both result free and force vibration responses of simulation were found corroborated with the experimental.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Mohamed Salleh, M. (2016). Vibration control of thin plate structure with attached dynamic vibration absorbers. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/8989/
Chicago Manual of Style (16th Edition):
Mohamed Salleh, Mohammad. “Vibration control of thin plate structure with attached dynamic vibration absorbers.” 2016. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/8989/.
MLA Handbook (7th Edition):
Mohamed Salleh, Mohammad. “Vibration control of thin plate structure with attached dynamic vibration absorbers.” 2016. Web. 26 Feb 2020.
Vancouver:
Mohamed Salleh M. Vibration control of thin plate structure with attached dynamic vibration absorbers. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2016. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/8989/.
Council of Science Editors:
Mohamed Salleh M. Vibration control of thin plate structure with attached dynamic vibration absorbers. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2016. Available from: http://eprints.uthm.edu.my/8989/
21.
Soo , Poey Lam.
Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2012, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/2662/
► Rifled tube which is one of the rough surface tube has been getting attention from researchers due to its ability to enhance the heat transfer.…
(more)
▼ Rifled tube which is one of the rough surface tube has been getting attention from
researchers due to its ability to enhance the heat transfer. Previous researches on
rifled tube has been done through experimental work. Therefore, numerical analysis
by using commercial Computational Fluid Dynamics (CFD), Fluent® has been
carried out to investigate the flow characteristic of the single phase flow in 2 meters
long of horizontally rifled tube and smooth tube under heating condition and without
heating condition at the outer wall. The rifled tube or also known as spiral internally
ribbed tube that is used in this investigation has an outside diameter 45.0 mm and
inside equivalent diameter of 33.1 mm while the smooth tube has an outside diameter
45 mm and inside diameter 34.1 mm. The working fluid that is used in this
investigation is water. In this numerical analysis, realizable k-epsilon model has been
chosen to solve the fully developed turbulence flow in the rifled tube and smooth
tube. The result of the numerical analysis showed that there was swirling effect at the
near-wall-region for both the case of the rifled tube under heating condition and
without heating condition at the wall. The flow characteristic of the rifled tube in
terms of pressure drop when there is no heat flux condition at the outer wall shows
that the pressure drop in rifled tube is 1.69 – 1.77 folds than in the smooth tube.
Meanwhile, when there is heating at the wall of the tubes, the pressure drop and heat
transfer coefficient in rifled tube are about 1.67-2.0 times and 0.97-1.27 times
respectively, than in smooth tube. The high pressure drop and Nusselt number in
rifled tube is due to the helical rib in the rifled tube which not only has disturbed the
flow but also causes swirling effect near the wall. As a result, the heat transfers from
the wall to the flow near the wall region is enhanced. The present study also has
proved that although the rifled tube produces high pressure drop but it is good in heat
transfer enhancement through the ratio of heat flux to the pumping power.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Soo , P. L. (2012). Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/2662/
Chicago Manual of Style (16th Edition):
Soo , Poey Lam. “Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube.” 2012. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/2662/.
MLA Handbook (7th Edition):
Soo , Poey Lam. “Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube.” 2012. Web. 26 Feb 2020.
Vancouver:
Soo PL. Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2012. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/2662/.
Council of Science Editors:
Soo PL. Analysis of the flow characteristic inside a heated and unheated horizontal rifled tube. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2012. Available from: http://eprints.uthm.edu.my/2662/
22.
Aman, Fazlina.
Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan.
Degree: PhD, Universiti Kebangsaan Malaysia, 2013, Fakulti Sains dan Teknologi
URL: http://eprints.uthm.edu.my/4634/
► Fenomenon kesan gelinciran pada permukaan boleh berlaku pada permukaan bendalir-pepejal dan pada permukaan lapisan bendalir-bendalir, terutama bagi sesetengah bendalir berskala kecil dalam mikroaliran. Dalam kebanyakan…
(more)
▼ Fenomenon kesan gelinciran pada permukaan boleh berlaku pada permukaan bendalir-pepejal dan pada permukaan lapisan bendalir-bendalir, terutama bagi sesetengah bendalir berskala kecil dalam mikroaliran. Dalam kebanyakan kajian aliran lapisan sempadan yang telah dilakukan oleh para penyelidik, didapati kesan gelinciran adalah baik bagi meningkatkan kadar pemindahan haba pada permukaan yang diperlukan dalam suatu proses penyejukan. Bagi aliran tanpa gelinciran, ciri-ciri pemindahan haba bergantung pada masalah aliran yang dikaji. Dalam tesis ini, model matematik dibina untuk mengkaji ciri-ciri aliran dan pemindahan haba bagi lima masalah aliran lapisan sempadan yang dihadkan kepada aliran mantap dua matra dalam bendalir likat tak mampat. Masalah pertama dan kedua masing-masing mempertimbangkan aliran berdekatan titik genangan dan aliran hidromagnet, kedua-duanya pada helaian tegak meregang. Masalah ketiga dan keempat mempertimbangkan syarat sempadan gelinciran, masing-masing bagi aliran terhadap titik genangan pada permukaan tegak dan aliran terhadap helaian telap mengecut. Sementara itu, masalah kelima melibatkan aliran pada permukaan meregang/mengecut di bawah aliran ricih luar dengan syarat sempadan permukaan olakan. Formulasi model matematik diperoleh dengan menurunkan persamaan pembezaan separa tak linear kepada persamaan pembezaan biasa menggunakan penjelmaan keserupaan. Analisis kepada sistem persamaan yang terhasil dimulakan dengan menyelesaikan masalah secara berangka menggunakan kaedah kotak Keller atau kaedah tembakan. Kaedah kotak Keller diatur cara menggunakan perisian MATLAB 7, manakala kaedah tembakan menggunakan atur cara “bina dalam” dalam perisian Maple 12. Seterusnya, nilai-nilai berangka bagi pekali geseran kulit dan nombor Nusselt setempat serta profil-profil halaju dan suhu diperoleh untuk pelbagai nilai parameter menakluk seperti parameter nisbah halaju, parameter keapungan, parameter magnet, parameter gelinciran halaju dan terma, nombor Prandtl, parameter olakan, parameter sedutan/semburan dan parameter regangan/kecutan. Keputusan berangka yang diperoleh dipersembahkan dalam bentuk jadual dan graf. Didapati gelinciran halaju mengurangkan pekali geseran kulit tetapi meningkatkan kadar pemindahan haba pada permukaan, manakala kesan gelinciran terma adalah sebaliknya. Suhu permukaan pula didapati bertambah dengan kehadiran medan magnet dan dengan syarat sempadan permukaan olakan. Selain itu, parameter-parameter menakluk yang lain turut mempengaruhi pekali geseran kulit dan nombor Nusselt setempat, di samping kewujudan penyelesaian dual atau unik, bagi masalah-masalah yang dikaji.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Aman, F. (2013). Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan. (Doctoral Dissertation). Fakulti Sains dan Teknologi. Retrieved from http://eprints.uthm.edu.my/4634/
Chicago Manual of Style (16th Edition):
Aman, Fazlina. “Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan.” 2013. Doctoral Dissertation, Fakulti Sains dan Teknologi. Accessed February 26, 2020.
http://eprints.uthm.edu.my/4634/.
MLA Handbook (7th Edition):
Aman, Fazlina. “Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan.” 2013. Web. 26 Feb 2020.
Vancouver:
Aman F. Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan. [Internet] [Doctoral dissertation]. Fakulti Sains dan Teknologi; 2013. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/4634/.
Council of Science Editors:
Aman F. Beberapa masalah aliran lapisan sempadan olakan dengan kesan gelinciran dan tanpa gelinciran pada permukaan. [Doctoral Dissertation]. Fakulti Sains dan Teknologi; 2013. Available from: http://eprints.uthm.edu.my/4634/
23.
Zulkarnain, Maizul Haffin.
Design and simulation study of obstacle based passive micromixer.
Degree: Fakulti Kejuruteraan Elektrik dan Elektronik, 2013, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/5497/
► Micromixer can be dividing by two categories which are active micromixer and passive micromixer. Due to simple fabrication technology and the easy implementation in a…
(more)
▼ Micromixer can be dividing by two categories which are active micromixer and passive micromixer. Due to simple fabrication technology and the easy implementation in a complex microfluidic system, obstacle based passive micromixers will be the focus of this project. Due to laminar flow (Reynold Number < 1) passive micromixer is the best method in fluids mixing. Passive micromixers also depend on the channel geometry for mixing effectiveness. In this study, seven different micromixers were evaluated based on the baseline control Y micromixer. The micromixers are Y shape with obstacle as proposed in PS 1 micromixer, Y shape with internal rib micromixer, Y shape with obstacle design 2, Y shape with obstacle design 3, Y shape with obstacle design 4, and Y shape with obstacle design 5. These micromixers has 237μm channel length, 30μm inlet length, 900 between inlets ports, width and depth are 30μm each. The fluids used for mixing were blood which has 3.0 × 10-3 kg/μms of viscosity and glycerin which has high viscosity than blood (1.49 × 10-3 kg/μms). The fluids used to evaluate the differences in term of their visual performance based image’s standard deviation by plotting the graph and mixing efficiency by calculation. Based on these evaluations, the Y shape with obstacle design 5 micromixers is the best micromixer design with the highest mixing efficiency of 100% at the outlet of the channel.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Zulkarnain, M. H. (2013). Design and simulation study of obstacle based passive micromixer. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/5497/
Chicago Manual of Style (16th Edition):
Zulkarnain, Maizul Haffin. “Design and simulation study of obstacle based passive micromixer.” 2013. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/5497/.
MLA Handbook (7th Edition):
Zulkarnain, Maizul Haffin. “Design and simulation study of obstacle based passive micromixer.” 2013. Web. 26 Feb 2020.
Vancouver:
Zulkarnain MH. Design and simulation study of obstacle based passive micromixer. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2013. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/5497/.
Council of Science Editors:
Zulkarnain MH. Design and simulation study of obstacle based passive micromixer. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2013. Available from: http://eprints.uthm.edu.my/5497/
24.
Yang Ghazali, Zalika.
Feasibility study of polysiloxane filled silica as a heat insulator application.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2014, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/5554/
► Polysiloxane or so called polymerized siloxane is basically silicones which are mixed of inorganic-organic polymers. Based on the previous study referred, there were limitation of…
(more)
▼ Polysiloxane or so called polymerized siloxane is basically silicones which are mixed of inorganic-organic polymers. Based on the previous study referred, there were limitation of the study on the elastomer as heat insulator, because researches more interested in investigation of the application of electrical insulator. The main objective of this study is to investigate and compare the performance of heat insulator produced by rice husk and synthetic silica as the filler. In this study, silica was used as the matrix filler of polysiloxane as the application of heat insulation. Polysiloxane were mixed with different percentage of both types of silica powder, which ranges of silica weight percentage from 0 wt% to 12 wt%. Casting process was conducted for the preparation of polysiloxane mixed with silica. The silica powder itself was evaluated based on its physical property and crystal structure by XRD analysis. As for the polysiloxane filled with silica, several testing were done such as density test, tensile test, thermogravimeric analysis and also heat insulation test. As for XRD analysis, phase identification was achieved by comparing the diffraction patterns of silica powder with JCPDS 46-1045 as for standard synthetic silica. Density test show that rice husk amorphous silica filler shown higher density than the synthetic silica filler. For tensile strength, both silica filler show different pattern of highest tensile strength, as rice husk filler shown at 10 wt%, while synthetic at 2 wt%. These percentages provide highest stress before it breaks at some point. TGA testing and heat insulation testing are the thermal testing which undergo to know the capability and how the polymers react with heat. Higher percentages of silica prove to be better heat insulator than without addition of silica.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Yang Ghazali, Z. (2014). Feasibility study of polysiloxane filled silica as a heat insulator application. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/5554/
Chicago Manual of Style (16th Edition):
Yang Ghazali, Zalika. “Feasibility study of polysiloxane filled silica as a heat insulator application.” 2014. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/5554/.
MLA Handbook (7th Edition):
Yang Ghazali, Zalika. “Feasibility study of polysiloxane filled silica as a heat insulator application.” 2014. Web. 26 Feb 2020.
Vancouver:
Yang Ghazali Z. Feasibility study of polysiloxane filled silica as a heat insulator application. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2014. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/5554/.
Council of Science Editors:
Yang Ghazali Z. Feasibility study of polysiloxane filled silica as a heat insulator application. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2014. Available from: http://eprints.uthm.edu.my/5554/
25.
Nalathambi, Deenesh Kumar.
Air flow profile evaluation around moving vehicle.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2014, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/5647/
► Highway lighting at night does increase the electricity costing because despite using solar energy to generate the electric for the lighting, mostly still uses direct…
(more)
▼ Highway lighting at night does increase the electricity costing because despite using solar energy to generate the electric for the lighting, mostly still uses direct current to work. The purpose of this study is to evaluate the air flow dispersed around moving vehicles and the wind turbine selection in harnessing electricity from the air flow dispersed. Solidworks and ANSYS software were used in modeling the vehicles and to analyze the flow characteristic, respectively. Analyses were done by the selection of 3 different vehicles which are a sedan car, a MPV and a bus by considering 3 different velocities i.e. 80km/h, 100km/h and 120km/h at 2 different environments which are the open road highway and road tunnel. Simulation computed the velocity field of the flow around the vehicles and also the turbine. The maximum wind speed dispersed obtained were used to calculate the wind power and mechanical power of the turbine analytically. It proves that the increment of vehicle’s speed increases the wind speed dispersed thus increasing the power generated by the selected wind turbine, Savonius Vertical Axis Wind Turbine with Two Semicircular blades.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Nalathambi, D. K. (2014). Air flow profile evaluation around moving vehicle. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/5647/
Chicago Manual of Style (16th Edition):
Nalathambi, Deenesh Kumar. “Air flow profile evaluation around moving vehicle.” 2014. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/5647/.
MLA Handbook (7th Edition):
Nalathambi, Deenesh Kumar. “Air flow profile evaluation around moving vehicle.” 2014. Web. 26 Feb 2020.
Vancouver:
Nalathambi DK. Air flow profile evaluation around moving vehicle. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2014. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/5647/.
Council of Science Editors:
Nalathambi DK. Air flow profile evaluation around moving vehicle. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2014. Available from: http://eprints.uthm.edu.my/5647/
26.
Jaini, Norhaslina.
Vibration analysis of a beam structure attached with two dynamic vibration absorbers.
Degree: Fakulti Kejuruteraan Mekanikal dan Pembuatan, 2014, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/6328/
► A fixed end beam is a structural element supported at both sides which carries load primarily in flexure that may experience vibration as it does…
(more)
▼ A fixed end beam is a structural element supported at both sides which carries load primarily in flexure that may experience vibration as it does carry vertical loads and gravitational forces. Its exposure to vibration can lead to excessive deflections and failure of to the structure. The aim of this research is to develop the application of dynamic vibration absorber on a fixed end beam structure. A classical mathematical model based on dynamic vibration absorber theory is improved by an analytical derivation until two degree of freedoms. The theoretical model is verified by experimental works. In experimental, two vibration absorbers was fabricated to be installed to the beam in four different conditions; and subjected to a force vibration frequency loading using an exciter. The resonance frequencies of interest were 11.23Hz and 35.45Hz. The vibration level that occurred on the beam is measured by comparing the effect of absorber presence to see the reduction in its amplitudes. Based on the experimental and theoretical analysis, both shows reduction in the beam amplitudes. From those results can be concluded that the dynamic vibration absorber has an ability to reduce and suppresses the beam vibration whereas the third condition has been chosen as the best arrangement where the persistent reduction results recorded 95 and 99 percents reduction of first and second DVA respectively. The knowledge gained from this research can be used to minimize the vibration amplitude of a structures and machines, increasing their life-span simultaneously. The other benefit comes from this research in specific or potential application aspect is it could control vibration in building or bridge structure and airplane wing flutter control.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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APA (6th Edition):
Jaini, N. (2014). Vibration analysis of a beam structure attached with two dynamic vibration absorbers. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/6328/
Chicago Manual of Style (16th Edition):
Jaini, Norhaslina. “Vibration analysis of a beam structure attached with two dynamic vibration absorbers.” 2014. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/6328/.
MLA Handbook (7th Edition):
Jaini, Norhaslina. “Vibration analysis of a beam structure attached with two dynamic vibration absorbers.” 2014. Web. 26 Feb 2020.
Vancouver:
Jaini N. Vibration analysis of a beam structure attached with two dynamic vibration absorbers. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2014. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/6328/.
Council of Science Editors:
Jaini N. Vibration analysis of a beam structure attached with two dynamic vibration absorbers. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2014. Available from: http://eprints.uthm.edu.my/6328/
27.
Tumiran, Mohamad Taufik.
Analysis on vibration monitoring at mrt infrastructure construction site.
Degree: Pusat Pengajian Siswazah, 2015, Universiti Tun Hussein Onn Malaysia
URL: http://eprints.uthm.edu.my/8019/
► The study focused on monitoring the level of Peak Vertical Vibration Velocity, mmls at one axis, and was conducted at the Bukit Bintang MRT Station…
(more)
▼ The study focused on monitoring the level of Peak Vertical Vibration Velocity,
mmls at one axis, and was conducted at the Bukit Bintang MRT Station and Kajang
MRT construction. Polytec Laser Doppler Vibrometer (LDV) was used to measure
the level of vibration during construction operation. The collaboration with the
government local authority such as Land Public Transportation Commission (SPAD)
and the project owner MRT Corp itself has helped the studies conducted
successfully. Data obtained were analyzed on different sources of vibration which is
from ambient, normal excavation, deep excavation and boring works and all data
was taken within 25m away from the sources of the vibration. The result from the
field measurement by different type of machines have been compared Eurocode 3
and DOE Malaysia. According to recommended limit for structural damage based on
Eurocode 3, the safety distances for Bauer BG 28, Komatsu PC200, Liebherr HS 855
HD Litronic, and Sumitomo SH120-3 with TB220 attachment in residential area are
177 m, 15 m, 7 m, and 19.7 m away from the source or receiver. While in
commercial land use, it is predicted to be 25 m, 5.3 my 1 m, and 3.4 m respectively.
However, DOE guidelines have lower structural damage criterion if compared with
Eurocode 3 whereas the recommended limits for damage risk in buildings from
steady state vibration only gave the range of frequency and the safety parameters.
For human response and annoyance criterion, it seems the use of Bauer BG 28
generates the highest vibration which could discomfort the environment. Based on
DOE guideline, the limit for residential area was between 1.2 mm/s to 2.2 mmls,
while for commercial use was between 2.2 mmls to 2.9 mm/s respectively. The
predicted safety distance from the finding was between 342 m to 2.1 km away from
the receiver. While the assessment based on Eurocode 3 found that the use of Bauer
BG 28 must be at least separated at 1.2 km away for the construction period less than
6 days.
Subjects/Keywords: TA349-359 Mechanics of engineering. Applied mechanics
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MLA ·
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CSE |
Export
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APA (6th Edition):
Tumiran, M. T. (2015). Analysis on vibration monitoring at mrt infrastructure construction site. (Masters Thesis). Universiti Tun Hussein Onn Malaysia. Retrieved from http://eprints.uthm.edu.my/8019/
Chicago Manual of Style (16th Edition):
Tumiran, Mohamad Taufik. “Analysis on vibration monitoring at mrt infrastructure construction site.” 2015. Masters Thesis, Universiti Tun Hussein Onn Malaysia. Accessed February 26, 2020.
http://eprints.uthm.edu.my/8019/.
MLA Handbook (7th Edition):
Tumiran, Mohamad Taufik. “Analysis on vibration monitoring at mrt infrastructure construction site.” 2015. Web. 26 Feb 2020.
Vancouver:
Tumiran MT. Analysis on vibration monitoring at mrt infrastructure construction site. [Internet] [Masters thesis]. Universiti Tun Hussein Onn Malaysia; 2015. [cited 2020 Feb 26].
Available from: http://eprints.uthm.edu.my/8019/.
Council of Science Editors:
Tumiran MT. Analysis on vibration monitoring at mrt infrastructure construction site. [Masters Thesis]. Universiti Tun Hussein Onn Malaysia; 2015. Available from: http://eprints.uthm.edu.my/8019/
28.
Li, Nan.
Development of real-time cellular impedance analysis system.
Degree: PhD, 2014, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/49706/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618910
► The cell impedance analysis technique is a label-free, non-invasive method, which simplifies sample preparation and allows applications requiring unmodified cell retrieval. However, traditional impedance measurement…
(more)
▼ The cell impedance analysis technique is a label-free, non-invasive method, which simplifies sample preparation and allows applications requiring unmodified cell retrieval. However, traditional impedance measurement methods suffer from various problems (speed, bandwidth, accuracy) for extracting the cellular impedance information. This thesis proposes an improved system for extracting precise cellular impedance in real-time, with a wide bandwidth and satisfactory accuracy. The system hardware consists of five main parts: a microelectrode array (MEA), a stimulation circuit, a sensing circuit, a multi-function card and a computer. The development of system hardware is explored. Accordingly, a novel bioimpedance measurement method coined digital auto balancing bridge method, which is improved from the traditional analogue auto balancing bridge circuitry, is realized for real-time cellular impedance measurement. Two different digital bridge balancing algorithms are proposed and realized, which are based on least mean squares (LMS) algorithm and fast block LMS (FBLMS) algorithm for single- and multi-frequency measurements respectively. Details on their implementation in FPGA are discussed. The test results prove that the LMS-based algorithm is suitable for accelerating the measurement speed in single-frequency situation, whilst the FBLMS-based algorithm has advantages in stable convergence in multi-frequency applications. A novel algorithm, called the All Phase Fast Fourier Transform (APFFT), is applied for post-processing of bioimpedance measurement results. Compared with the classical FFT algorithm, the APFFT significantly reduces spectral leakage caused by truncation error. Compared to the traditional FFT and Digital Quadrature Demodulation (DQD) methods, the APFFT shows excellent performance for extracting accurate phase and amplitude in the frequency spectrum. Additionally, testing and evaluation of the realized system has been performed. The results show that our system achieved a satisfactory accuracy within a wide bandwidth, a fast measurement speed and a good repeatability. Furthermore, our system is compared with a commercial impedance analyzer (Agilent 4294A) in biological experiments. The results reveal that our system achieved a comparable accuracy to the commercial instrument in the biological experiments. Finally, conclusions are given and the future work is proposed.
Subjects/Keywords: 620; TA0349 Mechanics of engineering. Applied mechanics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, N. (2014). Development of real-time cellular impedance analysis system. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/49706/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618910
Chicago Manual of Style (16th Edition):
Li, Nan. “Development of real-time cellular impedance analysis system.” 2014. Doctoral Dissertation, University of Sussex. Accessed February 26, 2020.
http://sro.sussex.ac.uk/id/eprint/49706/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618910.
MLA Handbook (7th Edition):
Li, Nan. “Development of real-time cellular impedance analysis system.” 2014. Web. 26 Feb 2020.
Vancouver:
Li N. Development of real-time cellular impedance analysis system. [Internet] [Doctoral dissertation]. University of Sussex; 2014. [cited 2020 Feb 26].
Available from: http://sro.sussex.ac.uk/id/eprint/49706/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618910.
Council of Science Editors:
Li N. Development of real-time cellular impedance analysis system. [Doctoral Dissertation]. University of Sussex; 2014. Available from: http://sro.sussex.ac.uk/id/eprint/49706/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618910
Iowa State University
29.
Waked, Adnan Mohammad.
Experimental investigation of flow between rotating spheres.
Degree: 1977, Iowa State University
URL: https://lib.dr.iastate.edu/rtd/5851
Subjects/Keywords: Mechanics; Applied Mechanics
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APA ·
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MLA ·
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APA (6th Edition):
Waked, A. M. (1977). Experimental investigation of flow between rotating spheres. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/rtd/5851
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):
Waked, Adnan Mohammad. “Experimental investigation of flow between rotating spheres.” 1977. Thesis, Iowa State University. Accessed February 26, 2020.
https://lib.dr.iastate.edu/rtd/5851.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Waked, Adnan Mohammad. “Experimental investigation of flow between rotating spheres.” 1977. Web. 26 Feb 2020.
Vancouver:
Waked AM. Experimental investigation of flow between rotating spheres. [Internet] [Thesis]. Iowa State University; 1977. [cited 2020 Feb 26].
Available from: https://lib.dr.iastate.edu/rtd/5851.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Waked AM. Experimental investigation of flow between rotating spheres. [Thesis]. Iowa State University; 1977. Available from: https://lib.dr.iastate.edu/rtd/5851
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
30.
Sistani, Ehsan.
PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
.
Degree: Chalmers University of Technology / Department of Applied Mechanics, 2010, Chalmers University of Technology
URL: http://hdl.handle.net/20.500.12380/128553
► This study concerns fluid dynamics of the flow around a rotating single gear wheel which is partially submerged in oil within a modelled SAAB gearbox.…
(more)
▼ This study concerns fluid dynamics of the flow around a rotating single gear wheel which is partially submerged in oil within a modelled SAAB gearbox. A literature survey shows a very limited amount of studies on this topic which are publicly available at the moment. The experimental measurements were carried out by means of Particle Image Velocimetry (PIV) on this very highly complex flow. For the purpose of experimental study a test rig representing a simplfied model of a gearbox was built. The rig is specially designed for using PIV which means the optical access to the flow is maximized. The flow similarity with respect to a real gearbox is maintained and the working fluid is a transparent mineral oil. The wheel model is made interchangeable and the wheel rotation speed can be varied to investigate different operation conditions. Two different wheel models with a diameter of 220mm were considered in the measurement, one of them is smooth and the other one has spur teeth. At a very low rotational speed, (50rpm), the flow is mostly in one-phase below the oil level. As the rotational speed increases (400rpm), the flow pattern around the wheel become chaotic and two different two-phase flows with rotation, free-surface effects, and liquid splashing effects are involved. As the wheel rotates and splashing lead to the creation of oil droplets in the top part of the box and air bubbles are generated in the bottom part within the oil. At this stage the optical access become limited by partly from bubbles and oil splashing on the window. These bubbles cause problems due to optical refraction and distortion when laser light is illuminated on them. This issue was partly resolved by performing the experimental measurement in a "transient" mode. The transient mode was applied in such a way that a trigger signal was provided from the wheel to the PIV processor in order to allow immediate measurements suddenly after the rotation was started.
Subjects/Keywords: Teknisk mekanik;
Strömningsmekanik;
Applied Mechanics;
Fluid mechanics
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sistani, E. (2010). PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
. (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/128553
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):
Sistani, Ehsan. “PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
.” 2010. Thesis, Chalmers University of Technology. Accessed February 26, 2020.
http://hdl.handle.net/20.500.12380/128553.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sistani, Ehsan. “PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
.” 2010. Web. 26 Feb 2020.
Vancouver:
Sistani E. PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
. [Internet] [Thesis]. Chalmers University of Technology; 2010. [cited 2020 Feb 26].
Available from: http://hdl.handle.net/20.500.12380/128553.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sistani E. PIV Measurements Around A Rotating Single Gear Partially Submerged In Oil Within Modelled SAAB Gearbox
. [Thesis]. Chalmers University of Technology; 2010. Available from: http://hdl.handle.net/20.500.12380/128553
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations