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RISEffect of Side Feed Pressurization on the Dynamic Performance of Gas Foil Bearings: A Model Anchored to Test Data
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Comprehensive modeling of gas foil bearings (GFBs) anchored to reliable test data will enable the widespread usage of these bearings into novel high speed turbomachinery applications. GFBs often ...
Thermohydrodynamic Model Predictions and Performance Measurements of Bump-Type Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An engineered thermal management is fundamental to the application of gas foil bearings (GFBs) as turboshaft supports in rotorcraft propulsion systems. The paper presents a model for the thermal ...
Limits for High-Speed Operation of Gas Foil Bearings
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Commercial oil-free microturbomachinery implements gas foil bearings (GFBs) for reliable performance with improved efficiency. However, GFB modeling is still largely empirical, lacking experimental ...
Performance of a Conduction Cooling Module
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A piston-type conduction cooling module for PCB-mounted IC’s has been developed and tested. Analysis of performance has been made using a finite difference scheme for the conduction piston. The ...
Thermohydrodynamic Analysis of Bump Type Gas Foil Bearings: A Model Anchored to Test Data
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The paper introduces a thermohydrodynamic (THD) model for prediction of gas foil bearing (GFB) performance. The model includes thermal energy transport in the gas film region and with cooling ...
Heavily Loaded Gas Foil Bearings: A Model Anchored to Test Data
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Widespread usage of gas foil bearings (FBs) into microturbomachinery to midsize gas turbine engines requires accurate performance predictions anchored to reliable test data. This paper presents a ...
Measurement of Total Hemispherical Emissivity Using Vacuum Guarded Hot Plate
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a new measurement method for the total hemispherical emissivity of surfaces is introduced. A vacuum guarded hot plate apparatus is developed and it is employed for the emissivity ...
Characteristics of Nuclear Spacecraft in Nano-Gravity for the Deep Space Explorer
Publisher: American Society of Civil Engineers
Abstract: Nuclear power is investigated for its use in space travel beyond Mars' orbit. Considered from the aspects of economy and safety, two kinds of spacecraft are compared: radioisotope thermoelectric generator (RTG)-powered and ...
Characterization of a Foil Bearing Structure at Increasing Temperatures: Static Load and Dynamic Force Performance
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Oil-free turbomachinery relies on gas bearing supports for reduced power losses and enhanced rotordynamic stability. Gas foil bearings (GFBs) with bump-strip compliant layers can sustain large ...
Rolling Stream Trails: An Alternative Cavitation Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The rolling stream trail (RST) model introduces a new formulation of cavitation analysis of an eccentric journal bearing; it is presented as a preferred foundation for cavitation analysis of a ...