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 13 of 13 for “"windage"”.
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High-speed video observation and on-line measurements of oil aeration in an internal combustion engine
… velocity, pass through drainage gaps in the windage tray, and strike the free surface of the oil. The rhythmic pulsation of oil droplets on the free surface caused the surface to slosh at the frequency of the crankshaft's rotation. Foam was observed to form above a threshold speed and a …
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Engine lubrication oil aeration
… design. Specifically, multiple designs of the windage tray, an engine component that separates the oil sump from the rotating crankshaft, were tested. Testing revealed that within the tolerance of the Air-X machine, the extent of the windage tray open area has no significant affect on the …
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Development of a high power density rotor
… a small geometry, and the difficulty of estimating windage losses because of the high speed and large diameter, are two. These challenges have been addressed through analytical design and a hardware prototype has been validated through testing. Through this analysis and testing it has been …
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A methodology for evaluating and reducing rotor losses, heating, and operational limitations of high-speed flywheel batteries
… losses, and a low pressure environment to reduce windage losses. With the flywheel rotor suspended on magnetic bearings and operating in a partial vacuum, radiation becomes the primary heat transfer mode for removing losses incurred on the rotor. Radiative heat transfer from the rotor to the …
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Understanding the source and distribution of marine macro-plastics in coastal environments
… physical forces arising from ocean currents, and windage, and coupled with particle tracking models, can predict the trajectories and fate of simulated particles over space and time. The aim of this PhD was to understand the spatial distribution and origins of beached plastic litter to provide …
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Induction machine stray loss from inter-bar currents
… copper loss, no load core loss, or friction and windage loss. Harmonic rotor bar currents from the non-sinusoidal distribution of the slotted stator winding contribute significant stray load loss. Rotor bars, especially on cast rotors for machines under fifty horsepower (37.3 kW), can be skewed, …
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Study of drag torque in a two-speed dual clutch transmission electric vehicle powertrain system
… aligned shafts, gear mesh friction and windage, oil churning, and bearing losses. Then experimental works are carried out on UTS electric vehicle powertrain system test rig. Outcomes of experimentation on drag torque confirm that simulation results agree well with the test data. Then, …
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Technology Demonstration of a Megawatt-Class Integrated Motor Drive for Aircraft Propulsion
… of this concept include the elimination of windage loss on the generator’s outer rotor surface, which is now used as the LPC hub, a reduction in overall number of bearings required, and an improvement in system volumetric power density by housing the generator inside the LPC. The lower …
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Numerical Investigations of Air Flow and Heat Transfer in Axial Flux Permanent Magnet Electrical Machines
… AFPM electrical machines without increasing the windage losses and contribute in this way to the enhancement of the overall efficiency of this type of machines.
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Development of a converter for grid-tied and isolated operation of an interior permanent magnet synchronous generator, coupled to a twin-shaft gas turbine
… control strategy minimises mechanical, core, windage and conduction losses. It also results in near unity power factor and near maximum developed torque. A nonconventional control structure that involves control of the DC-link from the generatorside converter is presented. This frees the …
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Little Buoys, Big Ocean: Observations of Wave-Driven Transport of Buoyant Objects in the Nearshore and Marginal Ice Zone
… stress gradient-driven currents, direct windage on the drifters, and Ekman transport accounts for their observed drift speeds. These results suggest that wave-driven transport mechanisms cause a significant portion of the observed drift at the outer edges of the ice pack. Wave-driven …
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Development of new methods for nonintrusive induction motor energy efficiency estimation
… is presented for estimating the friction and windage loss using the airgap torque and motor nameplate data. The proposed Nonintrusive Field Efficiency Estimation (NFEE) technique was validated experimentally on four different induction motors for both balanced and unbalanced voltage supply …
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An Experimental Investigation of Churning Power Losses of a Gearbox
In this study, load-independent (spin) power losses of a gearbox operating under dip-lubrication conditions are investigated experimentally. A family of final drive helical gear pairs from an automotive transmission is considered as the example for this investigation. A dedicated gearbox is …