A generalized analysis for spiral-grooved thrust bearings is presented. The effects of local radius are considered. For the same grooving geometry and the same inside-to-outside radius ratio, the inflow design is shown to be superior in both stiffness and load capacity. The analysis also treats a relative, transverse, oscillatory motion of the bearing surfaces. Both the magnitude and phase angle (in the temporal sense) of the bearing reaction are dependent on the frequency of the motion. The results for the oscillating motion reveal the possibility of a self-excited, rotor-bearing instability. The criterion for determining the onset of this type of instability is given.
Capillary, orifice, and flow control valve compensation of hydrostatic thrust bearings is investigated theoretically with regard to the effect of these three methods of compensation on the stiffness of the lubricant film. Equations are derived which permit rapid determination of bearing stiffness at any given load and film thickness. When a hydrostatic bearing is made to operate at any given film thickness and load, it is found that at this load and film thickness no adjustment of the compensating element or supply pressure will alter the fact that ψvalve > ψorifice > ψcapillary where ψ equals the absolute value of stiffness. Furthermore, with fixed supply pressure and compensation, this stiffness relationship will remain the same for all practical values of load above and below the initial film thickness-load point.
The importance of temperature and elasticity effects in bearings have been demonstrated by several authors. This paper offers an efficient method for the simultaneous solution of the Reynolds and energy equations and their coupling with elastic deformation results obtained by variational techniques. Results are presented for centrally pivoted, tilting-pad, sector, thrust bearings.
Approved Prepared underC o n t r a c t N o n r -3 7 3 0 ( 0 0 ) Task NR 061-131
t h e o r e t i c a l l y t h a t t h i s p o s s i b i l i t y i s p a r t i c u l a r l y advantageous f o runloaded j o u r n a l b e a r i n g s .
This paper d e s c r i b e s c o r r o b o r a t i n g experiments. The experiments i n c l u d e d t h erunning of an unloaded b e a r i n g up t o speeds of 60,000 rpm and t h e c o l l e c t i o n of s t e a d y s t a t e load-displacement a t t i t u d e a n g l e d a t a a t i n t e r m e d i a t e speeds up t o and i n c l u d i n g 60,000 rpm. No s i g n of b e a r i n g w h i r l i n s t a b i l i t y w a s det e c t e d . There w a s good c o r r e l a t i o n between t h e o r e t i c a l and e x p e r i m e n t a l d a t a .Design d a t a i s i n c l u d e d as a guide f o r f u t u r e d e s i g n s .
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