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 95 for “"body model"”.
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A three-dimensional whole body model for dynamic motion analysis
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1992
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Evaluation of a displacement-body model for hypersonic shock-wave/boundary-layer interaction
In this thesis, a displacement-body model for strong-interaction shock-wave/boundary-layer interaction (SBLI) is presented and evaluated. The model considers 2-D flow over a flat plate with an adiabatic wall. The separation bubble is modeled as a displacement body with constant surface pressure, …
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The Pseudo-Rigid-Body Model for Dynamic Predictions of Macro and Micro Compliant Mechanisms
… of compliant mechanisms using the Pseudo-Rigid-Body model (PRBM). In order to improve the number of mechanisms that can be modeled, this research develops and identifies several key concepts in the behavior of beam segments where both ends are fixed to a rigid body (fixed-fixed flexible …
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MOBILITY ANALYSIS AND TOPOLOGY SYNTHESIS OF COMPLIANT MECHANISM USING COMPLIANCE NUMBER AND PSEUDO-RIGID-BODY MODEL (PRBM)
… The compliance number (C) and the pseudo-rigid-body model (PRBM) concepts are then used to determine the degrees of freedom and the possible mode shapes for a given compliant mechanism. Furthermore, research is conducted for better characterization of the kinematic behavior of a compliant …
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A Closed-Form Dynamic Model of the Compliant Constant-Force Mechanism Using the Pseudo-Rigid-Body Model
A mathematical dynamic model is derived for the compliant constant-force mechanism, based on the pseudo-rigid-body model simplification of the device. The compliant constant-force mechanism is a slider mechanism incorporating large-deflection beams, which outputs near-constant-force across the …
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Injury Metrics, Real World Crash Reconstruction, and Robust Injury Prediction for a Human Body Model in Side Impact
… crash reconstructions using vehicle and human body finite element models (HBM) have the potential to elucidate injury mechanism, predict injury risk, and evaluate injury mitigation system effectiveness. The purpose of the work presented herein was to create a novel paradigm in finite element …
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Contribution of Lsh to DNA methylation reprogramming in embryonic stem cell, epiblast stem cell and embryoid body model systems
… specific helicase), a putative chromatin remodelling helicase, has been implicated in facilitating de novo methylation, as Lsh knockout embryos and derived somatic cell lines display substantial but specific DNA methylation losses at repetitive elements and single copy genes. This study aims …
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Investigating the impact of interacting with real world objects in virtual environments.
… difference in the PFOS while subjects had a full body model instead of a feet only model, with 6.6% less with the full body model in the forest and 5.0% in the room. Overall, incorporating physical objects in VR shows promise as a tool for clinical and training purposes.
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Design and modeling of carbon nanotube-based compliant mechanisms
… ability of a conventional compliant mechanism modeling approach, the pseudo-rigid-body model, to predict the region I behavior of a nano-scale parallel guiding mechanism that uses single-walled (5,5) carbon nanotubes as the flexural elements. Van der Waals forces were found to affect the …
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A study of aircraft agility
Two mathematical models are applied to the study of a flight performance problem for an air-superiority fighter aircraft. The first model considers the body axes angular rates as control variables and is accordingly referred to as the body rate model. The second model is a rigid body model …
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Development of a Small Unmanned Aerial Vehicle Longitudinal Model for Future Flutter Testing
… with limited knowledge about the dynamic model. The first task in obtaining a model for flutter testing is determining the rigid body model. Specifically, this thesis will focus in the development of the aircraft and obtaining the longitudinal rigid body model. This involves the assembly …
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Exact Diagonalization Studies of Strongly Correlated Systems
… systems, ranging from the Fermi-Hubbard model to the fractional quantum Hall effect (FQHE). The discussion starts with an overview of strongly correlated systems and what is meant by strongly correlated. Then, we extend cluster perturbation theory (CPT), an economic method for computing …
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Computational Modeling of the Helical Axis in the Human Knee--Detecting Changes in the Transverse Plane
… algorithm was designed and tested using three models: a multiplanar rigid body model, a mathematical model, and a cylinder model. The multiplanar rigid body model closely mimics knee movement without supporting ligamentous structures, thus the movement was unconstrained. In this model kinematic …
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Design and ESD Protection of Wideband, Radio Frequency Integrated Circuits in CMOS Technologies
… fully ESD-protected with an expected 2-kV human body model failure threshold.
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Design Automation for Reliable CMOS Chip Input/output Circuits
… prevalent failure mechanism during the Human Body Model (HBM) ESD stress. Previous circuit thermal model (integrator circuit) in iETSIM only applies for constant current stress. A general thermal model using convolution is developed. New techniques are proposed to implement a thermal …
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Molecular dynamics simulation : an investigation into the short range structure of metaphosphate glasses
… of the magnesium or zinc ions. Finally, a three body Born-Mayer-Huggins potential model was used to simulate the structure of P$\sb2$O$\sb5.$ This was achieved by developing the pair potential parameters for the P-O and P-P pair and comparing the structure of the simulated crystal to that of the …
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Advanced tuning of a trans-tibial prosthesis using motion capture and visualisation
… gait analysis protocols: Strathclyde Cluster Model (SCM), Human Body Model (HBM), Human Body Model 2 (HBM2) and Plug-in Gait (PiG) were investigated, and their reliability were explored in able-bodied and trans-tibial amputee (TTA) subjects. The SCM demonstrated good correlation, good …
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Hierarchical Control of Constrained Multi-Agent Legged Locomotion: A Data-Driven Approach
… control, we consider emulating the Single Rigid Body model through the use of Behavioral Systems Theory, resulting in a data-driven model that adequately describes a quadruped at the reduced-order level. Still, due to the complexity and a considerable number of variables in the problem, the model …
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On-Chip Actuation of Compliant Bistable Micro-Mechanisms
… of compliant segments. The pseudo-rigid-body model was used for the compliant mechanism design, and for analysis of the large-deflection flexible segments. To achieve on-chip actuation, the mechanism designs were optimized to reduce their required rotation, allow them to be switched using …
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