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 73 for “"Force model"”.
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Distributed force model for arbitrarily shaped IMPC actuators
A model that describes the relationship of an arbitrarily shaped artificial muscle to the force it produces does not currently exist for actuators made of ionic polymer-metal composites (IPMC), a type of electroactive smart material. The model in this thesis couples a finite element force …
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Development of a body force model for centrifugal compressors
This project is focused on modeling the internal ow in centrifugal compressors for the purpose of assessing the onset of rotating stall and surge. The current methods to determine centrifugal compressor stability limits are based on empirical data and often, experiments. Unsteady full wheel …
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A Mechanistic Force Model and Stability Analysis for Contour Turning
… the cutting stiffness variations. A mechanistic model based force-feedback scheme for disturbance rejection and tracking control in radial contour turning is proposed. The stability issues for the force-feedback design are addressed and the relative tracking performance of acceleration and force …
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A body force model for cavitating inducers in rocket engine turbopumps
… This thesis presents the development of a body force model for cavitating inducers with the goal of enabling interrogation of the onset of rotating cavitation and higher order cavitation instabilities and characterization of the governing uid dynamic mechanisms. Building on body force models of …
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Identification of Depth -of -Cut Variations and Their Effects on the Process Monitoring for the End Milling Process
… a fully-flexible mechanistic end milling force model is proposed to generate simulated force profiles for the DOC variation estimation. The end mill cutter is discretized as a series of elliptical disc elements. Effective cutter geometries, viz., effective helix angle and effective normal …
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Body Force Modeling for Engine Inlet Fan System
… nacelle/fan systems. The method adopts the body force concept using source terms to model the effects of fan blades. The method is designed to capture interaction effects between bypass fan and nacelle at off-design conditions, especially for circumferential inlet distortions. The unique feature …
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An investigation of the electromagnetic coupling problem by means of a rational framework and selected experiments
… interactions, electromagnetic coupling models are required. Identifying a suitable electromagnetic coupling model for a given application is a challenging task since there exists a multitude of different models in the literature and not all of these models are equivalent. This thesis …
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Milling cutter software architecture for force and surface finish modeling
… software platform that enables academic modeling research to be easily incorporated into industrial practice. The most significant contribution is creation of numeric structures that enable utilization of any milling cutting force model with any type of milling cutting tool in a …
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Traveling waves in mode superposition
… it was necessary to develop an excitation force model which has traveling wave characteristics. This idea has been implemented earlier using a Green's function approach. This work presents the idea of using mode superposition along with an excitation force model which has traveling wave …
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Hydrodynamic analysis and computer simulation applied to ship interaction during maneuvering in shallow channels
A generalized hydrodynamic interaction force model is combined with a ship maneuvering simulator to provide a free-running, closed loop ship simulation capable of trajectory predictions of ships operating in close proximity in a shallow, asymmetric canal. The interaction force model is based on the …
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An examination of the relative predictive accuracy of three versions of the Vroom model of motivational force using within-subject and across-subject analysis
Three valence versions of the model of work motivation described in 1964 by Victor Vroom in Work and Motivation were examined with respect to their relative abilities to predict work effort. The examination was carried out under both the across-subjects and within-subject theoretical assumptions. …
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Perceptions on Police Use of Force: A General Strain Theory Approach to Explicate Use of Force Incidents
… and its influence on police officers’ use of force. As a theoretical frame, Agnew’s General Strain Theory (GST) was applied to measure police officers’ decision making process in use of force, and the evaluation was compared to the college population. Data derived from law enforcement officers …
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A generalized approach for mechanics of chip formation in steady-state and dynamic orthogonal metal cutting using a new model of shear zone with parallel boundaries and its validation to cutting-forces prediction in self-piloting machining
… of chip formation based on a shear zone model with parallel boundaries that has been developed by applying the continuum mechanics to the analysis of the chip formation process. Such a model is formulated without imposing the assumptions commonly made in the single shear or parallel-sided …
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Compliant Meso-Scale Grinding of Silicon
… compliant grinding apparatus, a normal grinding force model and a depth of cut model were developed to account for the large compliance in the grinding system. Numerical simulation was performed to predict actual depths of cut and the results were within 6% of the measured/actual depths.
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Force and effort analysis of unfastening actions in disassembly processes
… of this dissertation is to develop an analytical model, which enables unfastening analysis during the design of new products. Specifically, (i) a standard nomenclature for defining unfastening related parameters and variables is introduced, (ii) the U-Effort model for deriving the unfastening …
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The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
… accuracy and to reduce the fluctuation of force, either interpolation or additional momenta have been introduced to the collision step of lattice Boltzmann equation.</p> <p>In this dissertation, a new boundary scheme based on diffuse geometry is proposed for lattice Boltzmann method. The …
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Mathematical modeling of lead climbing falls
<p>This thesis presents a force-based mathematical model for simulating dynamic falls in lead sport climbing, with an emphasis on physical realism and empirical validation. The system is modeled as a mass–spring–damper, incorporating gravity, nonlinear rope stiffness, internal damping, and …
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A Variable-Step Double-Integration Multi-Step Integrator
… accuracy requirements are desired. The force model used for earth-orbiting objects is quite complex and computationally expensive, so methods that minimize the force model evaluations are needed. The new method is compared to the fixed-step Gauss-Jackson method, as well as a method of …
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Construction and characterization of removable and reusable piezoelectric actuators
… well suited for actuator performance testing and model verification since attaching the actuator is time-consuming, removing the actuator is difficult, and the actuator is destroyed when it is removed. We present three alternate techniques for bonding flat piezoelectric patch-type actuators to …
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