Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 57 for “"contact model"”.
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A mechanically-derived contact model for adhesive elastic-perfectly plastic particles
A contact model able to capture the response of interacting adhesive elastic-perfectly plastic particles under a variety of loadings is presented. The contact model is valid through each of the three major contact regimes: elastic, fully-plastic, and bulk elastic---all with and without adhesion. In …
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Discrete Element Method (DEM) Contact Models Applied to Pavement Simulation
… introduction and comparison between various contact models. This paper will give a detail exploration on the contact models that can be potentially used in DEM pavement simulation; in the analysis, it includes both a theoretical part, simulation results and computational time cost, which can …
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Fundamental Modeling and Experimental Investigation of Dynamic Friction at the Meso and Micro Scales
In this work, a basic dynamic friction model without any empirical parameters has been developed and used to predict and explain important dynamic friction phenomena. The validation of the proposed dynamic friction model has also been confirmed via experimental measurements. Moreover, adhesion …
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Modeling of contact between liner finish and piston ring in internal combustion engines based on 3D measured surface
… when piston is at low speed and there is direct contact between rings and liners. This work focuses on prediction of contact between piston ring and liner finish based on 3D measured surface and different methods are compared. In previous twin-land oil control ring (TLOCR) deterministic model, …
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The development of rail-head acoustic roughness
A model of the development of rail-head acoustic roughness on tangent track has been formulated. The model consists of a two-dimensional time domain wheel-rail interaction force calculation, with the normal force used as the input to a two-dimensional rolling contact and wear model. The possibility …
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Pneumatic Tire Performance on Ice
… essential to have in depth understanding of the contact phenomena at the tire-ice interface, to improve vehicle safety on icy roads. This study has led to understanding of the contact phenomena at the tire-ice contact through experimental studies and a semi-empirical based tire-ice contact model. …
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Rough Surface Interactions of Micro/nano-Scale Contact Systems
… major issues of miniature systems in regards to contact behavior have been studied. First, nanomechanical properties of ultra-thin carbon films such as hardness and elastic modulus have been investigated using a newly developed nanoindentation technique and custom-built high-resolution …
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Appropriately complex biomechanical modelling of distance running
Mathematical models of human movement have the potential to provide information about how and why humans move the way they do. However, due to the existing gap between the current simple and complex models of running, it is unclear as to the level of complexity required to model normal distance …
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Resin percolation and intimate contact in fast processing of thermoplastic composites
… composites (TPCs) requires intimate contact before polymer interdiffusion and solidification can establish an interlaminar bond. The lack of such intimate contact results in voids or disbonds. This study showed through cross-sectional imaging and scaling analysis that percolation …
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A GPGPU implementation of the discrete element method applied to modeling the dynamic particulate environment inside a tumbling mill
… the advent of better computing, discrete element modeling (DEM) has taken on the challenge to model the dynamic particulate environment inside these devices in the search for understanding and hence improving the process of the size reduction of ore. This process represents a large percentage of …
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Mixed-domain performance model of the piezoelectric traveling-wave motor and the development of a two-sided device
… parallel objectives: (1) to develop an advanced modeling approach for the accurate prediction of steady-state performance of piezoelectric traveling-wave motors, and (2) to improve upon the typical piezoelectric traveling-wave motor configuration by investigating the novel implementation of …
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Analysis of novel flexure-based joint
… or much larger. Here, pseudo-rigid-body modeling is used in conjunction with the geometry of the joint mechanism in order to create analytic models of the forces at play in the joint, so as to better enable their design and use. Two mechanisms are analyzed: one in which the flexure is …
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Binder Film Thickness Effect on Aggregate Contact Behavior
… on the binder film thickness effect on aggregate contact behavior. As a three-phase material composed of aggregates, asphalt binder and air voids, asphalt mixture could be considered as a visco-elastic material in the low stress level. Since the behavior of the mixture depends largely on the …
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The vibration of rolling discs
… due to rotation of the disc and the effect of contact on the disc which in the first instance is modelled as a simple pinning constraint. Further in depth analysis is described for a more realistic model of the rolling contact including the effect of the contact stiffness and the creepage …
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Modular engineering of neuromuscular gait simulators
… the computer simulation of forward dynamic gait models and the optimization of parameters that must be tuned for such models. This methodology is not limited to gait simulation, and could be useful for any situation in which a complex Simulink model requires variables to be tuned via machine …
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Probability based models for the power draw and energy spectra of a tumbling mill
… (DEM) are used to develop probability based models for the power draw and collision energy spectra of a tumbling mill. Experiments are conducted using dry spherical glass bead charge in a laboratory scale tumbling mill, which is mounted with a torque transducer and tachometer to measure mill …
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A Wave Propagation Approach for Prediction of Tire-Pavement Interaction Noise
… available. Current methods rely on structural modeling of the complete tire using finite elements and modal expansion approaches that are accurate only at low frequencies. Therefore, alternative physically-based models need to be developed. This work proposes a new approach that incorporates …
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A comprehensive analytical model for pneumatic tires
… study presents a comprehensive analytical tire model for both vehicle dynamic simulation and tire design. The model is composed of two parts--modeling of the contact mechanism and determination of the tire forces/moments. A static circular beam model is introduced for the contact mechanism, in …
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Discrete Element Modeling of Railway Ballast for Studying Railroad Tamping Operation
… operation is studied by developing a simulation model using the Discrete Element Model (DEM), with the aim of optimizing the railroad tamping operation. A comprehensive literature review is presented showcasing the applicability of DEM techniques in modeling ballast behavior and its feasibility …
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Guided Wave Actuation for Enhanced Damage Identification in Carbon Fiber Reinforced Polymer Material Using Electrical Resistance Tomography
… of the method is verified using surrogate model based optimization for damage identification. The physical contact of embedded crack faces leads to current paths through the crack that limits the accuracy and resolution of ERT damage identification. To overcome this limitation, a new hybrid …
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