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 178 for “"dynamic performance"”.
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Dynamic performance of magnetically levitated rotors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Dynamic performance of small diameter tunnel thrusters.
The transient response of a small tunnel thruster is studied for step changes in applied voltage to the thruster motor. Previous work on positioning Remotely Operated Vehicles with a ducted propeller had shown that lags in the thruster response caused limit cycling in the vehicle's behavior. These …
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Dynamic Performance of Turbocharger Rotor-Bearing Systems
… speed turbocharger test rig (TTR) to measure dynamics of differing turbocharger rotor bearing systems and to develop a coupled rotor-cartridge model for the ball bearing rotor system to corroborate the experimental and analytical results. The ball bearing rotor is supported by an angular …
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Control of Dynamic Performance in Step Motor Systems
The step motor is an electromagnetic incremental motion control actuator. Step motors of both linear and rotary types have been constructed. When energized by direct currents in a programmed manner the step motor indexes in fixed linear or angular increments. In general, the motor does not follow …
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Modeling robot dynamic performance for endpoint force control
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Static and dynamic performance during precision fine motor tracking
Studies of static and dynamic motor control have a long research history. In most cases, studies have focused on one condition or the other. However, it is important to determine whether differences exist between the two types of task, especially when used in conjunction with task performance. …
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Investigation of the Dynamic Performance of a Cable-Stayed Footbridge
… phenomena like cable nonlinearities, deck dynamic instability and deck lateral oscillations due to pedestrian walking. These phenomena, if intertwined, may bring these structures out of service or to failure. In view of a better performance, additional damping can be provided by passive …
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Static and Dynamic Performance of Biochar Enhanced Cement Stabilised Peat
… investigation are to evaluate the static and dynamic performance of biochar enhanced cement stabilised peat. The results of the static tests show that biochar crushed to a size smaller than 75 µm performs significantly better than sand as a filler. Samples with 10% cement and 40% biochar …
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Enhanced Modulation Dynamic Performance of Optically-Injected Widely-Tunable Semiconductor Lasers
… comprehensive theoretical and modelling study of dynamic modulation characteristics of semiconductor wide-wavelength tunable laser diodes (TLDs). The two major goals were to investigate how modulation properties of a TLD depend on the wavelength tuning, and how the modulation performance of a TLD …
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Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters
… used in today's power supplies. However, the dynamic performance of these current sharing control schemes are not yet clearly explored. In this work, the dynamic current sharing performance is evaluated for paralleling systems with the output impedance approach. As the representative of the …
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Design and shape control of lightweight mirrors for dynamic performance and athermalization
… mirror for an advanced space telescope for both dynamic performance and shape control. A parametric model of a rib-stiffened mirror is created in order to quickly analyze many different mirror geometries. This model is used to examine the homogeneous dynamics of the mirror to determine what …
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FAULT DIAGNOSIS OF ELECTRONIC FUEL CONTROL (EFC) VALVES VIA DYNAMIC PERFORMANCE TEST METHOD
… of the valve but does not adequately capture its dynamic response. A dynamic test procedure is developed in order to evaluate the performance of the EFC valves. The test itself helps to understand the effects that proposed design changes will have on the stability of the overall engine system. A …
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Dynamic performance of control loops and their interactions in a VAV HVAC system
… analyzed in this thesis. The steady state and dynamic characteristics of a VAV-HVAC control system has been studied. The interaction between control loops of a VAV system operating under (i) open-loop, (ii) closed-loop control modes were evaluated. Also six local loops were tuned and optimal …
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Dynamic performance of pre-cast prestressed beams – cast in-situ slab composite bridges
… zone. These limitations can be overcome by using dynamics-based techniques. The main objective of this work is to investigate experimentally the effectiveness of dynamics-based techniques in assessing the condition of shear connectors in concrete composite bridges consisting of pre-cast …
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Dynamic exoskeleton : mechanical design of a human exoskeleton to enhance maximum dynamic performance
… with the primary goal of enhancing the maximum dynamic capability of a human, thus allowing the user to run faster, jump higher, or traverse challenging terrain. This paper presents the mechanical design of an alpha prototype with a focus on increasing the maximum vertical jump height of a …
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Position-specific isometric strength tests and their relationship with dynamic performance in collegiate athletes
Dynamic performance is an essential part of many sports and its correlation with isometric strength tests has garnered substantial attention considering the practical utility of isometric testing. Practitioners have assessed maximal isometric strength in athletic populations predominantly using …
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Forecasting product returns and their impact on dynamic performance in closed-loop supply chains
… product returns, and exploring the CLSC dynamic performance. The research contributes to both current study on RL/CLSC and practitioners within the relevant areas as: (1) it explores various RL options and their practices in a CLSC system through a comprehensive literature review, which …
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Influence of road roughness and directional maneuvers on the dynamic performance of heavy vehicles
… preservation of the roadways. The directional dynamics of articulated heavy vehicles is investigated to study the influence of road roughness on the directional performance measures and the road damage potentials of the vehicle undergoing a directional maneuver. The directional performance …
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The steady-state and dynamic performance of gas lubricated uniform film porous thrust bearings
… with methods of predicting the steady-state and dynamic performance characteristics of a uniform film porous thrust bearing. Analytic predictions are made, based on the laminar flow through the bearing of a perfect gas. A series solution of the pressure distribution throughout the porous pad and …
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Dynamic exoskeleton : design and analysis of a human exoskeleton to enhance maximum dynamic performance
… Therefore, they are not suitable for highly dynamic motions. This thesis describes the first attempt to develop a powered exoskeleton suit that improves the maximum dynamic capability of a human. This Dynamic Exoskeleton is intended to enable to the user to run faster, jump higher, or …
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