Accession Number : AD0695381

Title :   DYNAMIC ANALYSIS OF A THREE-FOIL ROTOR SUPPORT SYSTEM IN ZERO GRAVITY ENVIRONMENT.

Descriptive Note : Technical rept.,

Corporate Author : AMPEX CORP REDWOOD CITY CALIF RESEARCH AND ADVANCED TECHNOLOGY DIV

Personal Author(s) : Eshel,A.

Report Date : 01 SEP 1969

Pagination or Media Count : 72

Abstract : The dynamic and static behavior of a gas lubricated bearing, consisting of stretched foil sectors, is analyzed. General equations describing the fluid film and valid for shaft excursions of the order of the clearance, are desrived on the basis of planar motion and negligible fluid inertia. The analysis is then specialized to the case of a bearing consisting of three equally spaced foil sectors. For the static equilibrium condition, tensions and gaps are calculated and graphs are presented. For the dynamic case, the basic equations are linearized, and equations for the in- and out-of-phase steady-state response to sinusoidal excitation are derived. This serves as an illustration of foil-bearing dynamic behavior as well as for stability investigation. For the case of zero radial load, the effects of speed, rotor radius, foil thickness, wrap angle and initial tension on the coefficients of damping and stiffness are graphically presented. Within the range of parameters investigated, the following distinct characteristics of the foil bearing were found. (Author)

Descriptors :   (*GAS BEARINGS, IMPELLERS), AERODYNAMIC CHARACTERISTICS, SUPPORTS, GRAVITY, WEIGHTLESSNESS, STABILITY, STATICS, EQUATIONS OF MOTION

Subject Categories : Hydraulic and Pneumatic Equipment
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE