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 62 for “"Lumped parameter model"”.
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A lumped-parameter model of tire-terrain interactions for off-road vehicles
… need for accurate and computationally efficient models has increased to meet the demands of vehicle handling simulations for designing various control units. Tire-terrain model forms the center piece of such vehicle model development. This thesis aims at developing a discrete, lumped-parameter, …
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Development and Analysis of the Lumped Parameter Model of a Piezo-Hydraulic Actuator
… of a piezoelectric stack has been achieved. A lumped parameter model is developed in order to simulate the dynamics of the hydraulic system and of the entire piezohydraulic unit. The model did approximate the response of the piezohydraulic unit under a one-sided operation. Time response …
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A modal analysis method for a lumped parameter model of a dynamic fluid system
A lumped parameter model is developed for the analysis of dynamic fluid systems and the techniques of modal analysis are applied. An introduction to the lumped parameter modeling approach is accomplished by a thorough review of the dynamic mechanical system. This review of mechanical system …
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Lumped Parameter Model for a Self Powered Fontan Palliation of the Hypoplastic Left Heart Syndrome
… is created to identify important physiological parameters caused be the IJS. By numerically approximating the solution using a lumped parameter model (LPM) of a single ventricle cardiovascular system, the physiological parameters can be approximated. Systemic flow, pulmonary flow, caval pressure …
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Nonlinear Lumped-Parameter Model of the Lumbar Intervertebral Disc: A Study on Viscoelastic Deformation and Three-Dimensional Modeling of the Spine
… complexity of current musculoskeletal spine models, there is a need for computationally-efficient models of the intervertebral disc (IVD). The aim of this study is to develop a mathematical model that will adequately describe the motion of the IVD under axial cyclic loading and …
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A Coupled CFD-Lumped Parameter Model of the Human Circulation: Elucidating the Hemodynamics of the Hybrid Norwood Palliative Treatment and Effects of the Reverse Blalock-Taussic Shunt Placement and Diameter
… standard procedure. A computational multiscale model of such HLHS circulation following the HN procedure was used to obtain detailed hemodynamics. Implementation of a reverse-BT shunt (RBTS), a synthetic bypass from the main pulmonary to the innominate artery placed to counteract aortic arch …
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An analytic evaluation of the upper break frequency of the human otolith organ
… two orders of magnitude too small. The accepted lumped parameter model of the otolith organ is approximated to be independent of cupular stiffness for small time. Removal of the stiffness leads to a problem which, when subjected to a change in linear velocity, is analogous to Stokes' impulsive …
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Subjective and objective vehicle handling behaviour
… work was to demonstrate how a relatively simple lumped parameter model, suitable for effective use at the early stages of vehicle design, could be used to predict both the objective responses and subjective feel of the car. The work associated with the project was centred around sixteen …
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A Design Space Exploration Process for Large Scale, Multi-Objective Computer Simulations
… of good partitions for creating partitioned metamodels of large scale systems. The new hierarchically partitioned metamodeling scheme, the lumped parameter model (LPM), was developed to address two primary limitations to the current partitioning methods for large scale metamodeling. First the LPM …
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Optimization of a magnetically saturable interior permanent-magnet synchronous machine drive
… for high-performance IPM machine design is to model the magnetic saturation of the core in a manner that is accurate, flexible, and computationally fast for design optimization. A magnetically-saturable lumped parameter model (LPM) is developed for the optimized design of high-performance IPM …
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Propulsion optimization for ABE, an autonomous underwater vehicle (AUV)
… a matched motor and transmission. A non-linear lumped parameter model of the thruster is developed and experimentally verified. The model is used to predict thruster performance and compare the design thruster with other variants of propeller and motor/transmission combinations. The results …
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Enhancement of crashworthiness in car-truck collisions using damped under-ride guard and composite crush elements
… dissipating under-ride guard is analytically modeled and the performance potentials are investigated under direct and oblique impacts to enhance the crashworthiness of automobiles involved in collisions with heavy freight vehicles. The under-ride guard is analytically modeled incorporating …
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Development, modeling, testing and evaluation of vibration attenuating gloves
… characteristics. A four degree-of-freedom, lumped-parameter model of the vibration response of the human hand and bladder was developed using measured hand and bladder parameters. This model, along with subjective criteria, was used to design and fabricate two prototype bladder-glove units. …
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A model to define hydrologic response units based on characteristics of the soil-vegetative complex within a drainage basin
… and hydrology group classification. A computer model was developed to generate excess precipitation for each hydrologic response unit based on the Mein and Larson and Holtan infiltration equations. Data for several major storms from a natural watershed, located in Virginia, was used to evaluate …
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Incorporating thruster dynamics in the control of an underwater vehicle
… of thruster dynamic behavior. An energy-based lumped parameter model of the nonlinear thruster dynamic response is developed and experimentally verified using static and dynamic thruster relationships. Three controllers to compensate for the nonlinear dynamics are designed including analog lead …
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Design and parametric simulation of radially oriented electromagnetic actuators
… and target formation - is a thirteen value lumped parameter model. The simulation was used heavily in the design and refining of two experimental prototype systems. These prototypes showed excellent model-experiment matching. The experimental prototypes are 2.5" radius, 12" length …
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Multi-scale computational modeling of coronary blood flow: application to fractional flow reserve.
… combined with computational coronary flow modelling may reduce the patient’s burden of undergoing invasive testing. Research statement. The ability to obtain information of the hemodynamic significance of detected lesions would streamline decision making in escalation to invasive …
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An investigation into the thermal modelling of induction motors.
… rise must be limited to safe values. A lumped parameter thermal model has been developed, which allows rapid and accurate estimation of the temperature distribution in a machine. The lumped parameter thermal model depends on the accurate knowledge of the thermal coefficients and more …
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The role of system dynamics on the behavior of elastomeric friction
… critical velocities bounding each regime. System parameters were varied to determine sliding conditions leading to self-induced vibration, to establish how the character of vibration is affected, and to correlate friction torque with system and acoustic vibration for each elastomeric material. A …
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Seismic Fragility Assessment for Reinforced Concrete High -Rise Buildings
… assessments are undertaken using a simplified lumped-parameter model that was derived from highly detailed FE models using genetic algorithms. New definitions for performance limit states are based on the results of detailed pushover analyses of a multi-resolution distributed finite element …
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