Effect of geometry and operating conditions on spur gear system power loss [PDF]
The results of an analysis of the effects of spur gear size, pitch, width, and ratio on total mesh power loss for a wide range of speeds, torques, and oil viscosities are presented. The analysis uses simple algebraic expressions to determine gear sliding,
Anderson, N. E., Loewenthal, S. H.
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IEEE AccessGiven the challenges of high loss density and heat dissipation in high-speed switched reluctance motors (HSRMs), this paper proposes a thermal analysis and cooling design method based on electromagnetic-thermal-flow (EM-TF) coupling. A 3 kW, 20,000 r/min
Lukuan Qiao +5 more
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Comparison of spur gear efficiency prediction methods [PDF]
The predictions of five spur-gear efficiency calculation methods were compared with three sets of test data using different gear geometries. The data and the analysis methods were limited to jet lubricated, ground, spur gears. The data covered a range in
Anderson, N. E., Loewenthal, S. H.
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Development of a high-fidelity model for an electrically driven energy storage flywheel suitable for small scale residential applications [PDF]
, 2018 Energy storage systems (ESS) are key elements that can be used to improve electrical system efficiency by contributing to balance of supply and demand. They provide a means for enhancing the power quality and stability of electrical systems.
Boby +26 more
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Cold-air performance of a tip turbine designed to drive a lift fan. 3: Effect of simulated fan leakage on turbine performance [PDF]
Performance data were obtained experimentally for a 0.4 linear scale version of the LF460 lift fan turbine for a range of scroll inlet total to diffuser exit static pressure ratios at design equivalent speed with simulated fan leakage air.
Futral, S. M., Jr. +3 more
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Computational fluid dynamics modelling of an entire synchronous generator for improved thermal management [PDF]
, 2013 This study is the first in a series dedicated to investigating the airflow and thermal management of electrical machines. Owing to the temperature dependent resistive losses in the machine's windings, any improvement in cooling provides a direct ...
Boglietti A. +21 more
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Modelling and Experimental Study of Power Losses in Toothed Wheels. [PDF]
Sensors (Basel), 2023 Giannetti G, Meli E, Rindi A.
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Design of Spur Gears for Improved Efficiency [PDF]
A method to calculate spur gear system loss for a wide range of gear geometries and operating conditions was used to determine design requirements for an efficient gearset.
Anderson, N. E., Loewenthal, S. H.
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Effect of Reynolds number on overall performance of a 6-inch radial bladed centrifugal compressor [PDF]
Overall performance of centrifugal compressor over range of inlet pressures and corresponding Reynolds ...
Ball, C. L. +2 more
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The Effectiveness of Shrouding on Reducing Meshed Spur Gear Power Loss - Test Results [PDF]
Gearbox efficiency is reduced at high rotational speeds due to windage drag and viscous effects on rotating, meshed gear components. A goal of NASA aeronautics rotorcraft research is aimed at propulsion technologies that improve efficiency while ...
Delgado, I. R., Hurrell, M. J.
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