Accession Number : ADA310163

Title :   Development of Ball Bearing Dynamic Analysis Methods Including Life Prediction Methods for Ceramic or Metal Bearings.

Descriptive Note : Interim rept. 1 Mar 92-1 Apr 94,

Corporate Author : AVCON ADVANCED CONTROLS TECHNOLOGY INC AGOURA HILLS CA

Personal Author(s) : Meeks, Crawford ; Murphy, Brian ; Tran, Long

PDF Url : ADA310163

Report Date : APR 1994

Pagination or Media Count : 159

Abstract : An analytical ball bearing dynamics model was developed that rigorously models all of the significant kinematics, structural and dynamic effects. The model can analyze bearings of any material combination for the races, ball and ball cage. This model analyzes the stresses and deflections of the loaded elements due to (1) preload, (2) external axial, radial and moment loads, (3) centrifugal and gyroscopic ball loads. A rigorous six-degree-of-freedom model of ball cage motions was developed to analyze ball and cage dynamics. The ball cage equations of motion were written in a rotating coordinate system, which greatly simplifies the equations, resulting in a highly efficient, but rigorous, model of bearing dynamics. A computer program was developed, incorporating the above model and algorithms to solve the multiple simultaneous quasi-static ball-to-race load equations using modified Newton-Raphson methods. The Lawrence Livermore Ode numerical integration package (LSoDA) is also employed for integration of the dynamic equations of motion. This method assures convergence, while controlling the accuracy of the calculations as a function of computer run time and automatically selects the appropriate integration method of stiff and non-stiff of collision contact conditions. The program analyzes ball and cage motions in time domains and predicts wear life, fatigue life, lubricant film effects, ball-to-cage forces, torque noise and many other bearing parameters.

Descriptors :   *METALS, *DYNAMICS, *CERAMIC MATERIALS, *BALL BEARINGS, KINEMATICS, STRESSES, COMPUTER PROGRAMS, ALGORITHMS, COMPUTATIONS, EQUATIONS OF MOTION, FATIGUE LIFE, MODELS, PARAMETERS, STRUCTURAL PROPERTIES, LOADS(FORCES), DEFLECTION, MOMENTS, DEGREES OF FREEDOM, INTEGRATION, NUMERICAL INTEGRATION, NOISE, ROTATION, TIME DOMAIN, TORQUE, COLLISIONS, LUBRICATING FILMS, RADIAL STRESS, BEARING CAGES, BEARING RACES.

Subject Categories : Machinery and Tools
      Inorganic Chemistry
      Ceramics, Refractories and Glass
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE