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DEVELOPMENT OF GAS-FOIL BEARINGS FOR MINIATURIZED RTB CRYOCOOLERS – PHASE III

DEVELOPMENT OF GAS-FOIL BEARINGS FOR MINIATURIZED RTB CRYOCOOLERS – PHASE III. MINIATURE ENGINEERING SYSTEMS GROUP. MATHEMATICAL MODELING AND ANALYSIS – I Presented by  K.V.Krishna Murty MMAE. ISSUES TO BE CONSIDERED FOR ANALYSIS IN PHASE III. Thermodynamic and Heat Transfer issues,

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DEVELOPMENT OF GAS-FOIL BEARINGS FOR MINIATURIZED RTB CRYOCOOLERS – PHASE III

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  1. DEVELOPMENT OF GAS-FOIL BEARINGS FOR MINIATURIZED RTB CRYOCOOLERS –PHASE III MINIATURE ENGINEERING SYSTEMS GROUP MATHEMATICAL MODELING AND ANALYSIS – I Presented by  K.V.Krishna Murty MMAE

  2. ISSUES TO BE CONSIDERED FOR ANALYSIS IN PHASE III • Thermodynamic and Heat Transfer issues, • Fluid flow issues, • Mechanical issues.

  3. Thermodynamic and Heat Transfer Issues • Heat dissipation and consequent thermal expansion in foils because of friction. • Heat transfer to outer and inner journals from foils. • Heat transfer between the fluid (gas) and the foils. • Present status: • The Tribological Coatings Groupis looking into the coatings to be deposited on foils to provide lubrication. • The foils are being thermally analyzed for Heat Transfer and dissipation effects in software IDEAS.

  4. Fluid Flow Issues • Dynamic behavior of gas/fluid in the annular space between the shaft and the foils. • Present Status: Not being dealt presently.

  5. Mechanical Issues • Effect of shaft ‘Vibrations’ and ‘Critical Speed’ on the fluid dynamics and the foil geometry. • ‘Stiffness’ and ‘Damping’ in foils. • Present Status: • The ‘Vibrations’ and ‘Critical Speed’ issue is integrated with shaft/rotor design for motor and is being analyzed. Some results were already presented. • Mathematical modeling to analyze ‘Shaft Whirl’ using some ‘Finite Element’ methods is being done and the corresponding algorithms are being computer coded using ‘MATLAB’.

  6. Future Work • To continue ‘Mechanical-Thermal Analysis’ in IDEAS. • To do the ‘Fluid Flow Analysis’ using CFD software. • Mathematical modeling of foil ‘Stiffness’ and ‘Damping’.

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