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 81 for “"constant speed"”.
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Optimal-efficiency constant-speed control of nonlinear variable reluctance motor drives
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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A Proposed Numerical Method for the 3D Wave Equation with Constant Speed
… a new numerical scheme to solve the (classical) constant speed wave equation in the three dimensional space, currently existing methods (even if more restrictive) rely on time iterations and observe the accumulation of error at each time step iteration, the new method is iteration free ! Making …
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Design and tests of a six-stage axial-flow compressor having a tip speed of 550 feet per second and a flat operating characteristic at constant speed
… compressor with a 550 feet per second tip speed and a flat operating characteristic (constant stagnation-pressure ratio at constant speed over the operating range of the compressor) was designed and tested. The design theory and test results are presented in this thesis. It was designed for …
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Economic comparison of the constant and variable speed motor-driven boiler feed pumps in today's steam electric power station
… justifiable boiler feed pumping arrangement with constant speed drive or variable speed drive through hydraulic couplings would vastly improve power plant economy and operation. This study compares the costs and operating characteristics of two constant-speed boiler feed pumps operating in …
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Acceleration and fatigue in soccer
… systems (GPS) for measuring instantaneous speed during the acceleration, deceleration and constant speed phase of straight-line running. The criterion measure used to assess GPS validity was instantaneous speed recorded using a tripod-mounted laser. Ten Hz GPS devices were 2-3 times more …
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Platoon modal operations under vehicle autonomous adaptive cruise control model
… Control Systems (AVeS). Three control modes, constant speed, emergency and vehicle-following, are defined based on the minimum safe stopping distance, and applied to the platoon operations. Desired acceleration model is built for the different cruise control mode by considering the relative …
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The development and optimization of a hydrogen-fueled internal combustion engine
… fuel injection. Because the application is for constant speed application, tuned intake and exhaust is used.
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Condensation and Freezing Front Propagation on Surfaces With Topographic and Chemical Modifications
… in a 200mum-to-400mum-thick water layer. The speed of a freezing front oscillates locally over the grooves, with propagation retarded in troughs and accelerated on crests. When the water freezing point moves at a constant speed, the speed of a freezing front on crests can be more than 8 times …
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An electro-mechanical acoustic imaging scanner assembly.
… an acoustic lens. The line array is rotated at a constant speed of 400 RPM. Acoustic signals at 250 KHZ of approximately 26 db re 1 ubar at the transducers were sufficient to produce satisfactory detection.
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Instrumentos de queda livre para medição de parâmetros oceanográficos
… oceanographic instruments. The stability and constant speed during the fall are guaranteed by the action of rotary wings attached to a cilindric body. Signals from the sensors are brought aboard by electrical cable where they feed graphic or magnetic recorders. One can get profiles from the …
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A test platform for measuring the energy efficiency of AC induction motors under various loading conditions and control schemes/
… loading conditions while operating in both a constant speed mode and while performing speed to speed transitions. The details of the construction are provided. The motor under test is fully characterized and modeled in order to establish theoretical bounds for maximum efficiency operation. In …
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Research on the Performance of JP-8, Single Fuel Concept, in Diesel Engine Application for Airport Ground Support Equipment
… and overall efficiencies increased with bmep at constant speed but were minimally influenced by the fuel blend. Soot showed an increase at higher loads ranging between 0.09- 0.8 g/kWh while carbon dioxide (CO2) emissions showed a decrease in value by increasing bmep at constant speed. NOx …
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The Effect of Suspension on Parametric Stability and Bifurcation of Geared Systems in Permanent Contact Regime
… gears with rigid mountings, specifically under constant speed operational conditions. These studies show that for these models, the separation of the teeth and rattling occur in the vicinity of the unstable tongues. Under these conditions, the clearance between the teeth in mesh is the main …
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Asymptotic Analysis of Perturbations to Travelling Wave Solutions of Nonlinear Advection-Reaction-Diffusion Equations of Fisher Type
… the thesis is to investigate the case where the constant speed of the background medium is perturbed by a small-amplitude spatially and temporally localized perturbation.
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Optimal evasion against a proportionally guided pursuer
… The analysis is done for planar motions at constant speed. The kinematics are first linearized around a nominal collision course. The dynamics of the opponents are modeled by first order systems and their accelerations may be bounded. Three cases are studied: unconstrained optimal evasion …
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A contact-implicit direct trajectory optimization scheme for the study of legged maneuverability
… been the subject of little research compared to constant-speed gait. They are difficult to study for two reasons: firstly, the way they are executed is highly sensitive to factors such as morphology and traction, and secondly, they can potentially be dangerous, especially when executed rapidly, …
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Differences in Aerobic Response to Wheelchair Locomotion
… were recorded using a Vmax ST system during the constant speed test. There was no significant difference in HR or VO2 between the two groups during rest. Both HR and VO2 were higher for WC during exercise. The mean METS during exercise for WC and AB were 3.589 ± 0.516 and 2.726 ± 0.164, …
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Evaluation of an acoustic detection algorithm for reactive collision avoidance in underwater applications
… the acoustic source was moving at approximately constant speed, providing validation of the model at the proof-of-concept level.
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An Investigation of Distortion Indices for Prediction of Stalling Behavior in Aircraft Gas Turbine Engines
… were tested for correlation capability with constant speed loss in stall pressure ratio, constant mass loss in stall pressure ratio, and engine speed where appropriate. Predictive indices/models were compared directly with experimental data. In addition, the concept of including the effects …
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Variability of peak shoulder force during wheelchair propulsion as a function of shoulder pain
… were recorded for three minutes maintaining a constant speed at three distinct propulsion speeds (fast speed of 1.1m/s, a self-selected speed, and a slow speed of 0.7m/s). Peak resultant shoulder forces in push phase were calculated using inverse dynamics. There was no difference in mean …
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