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Modeling of Rolling Element Bearing Mechanics: Computer Program UpdatesThe Rolling Element Bearing Analysis System (REBANS) extends the capability available with traditional quasi-static bearing analysis programs by including the effects of bearing race and support flexibility. This tool was developed under contract for NASA-MSFC. The initial version delivered at the close of the contract contained several errors and exhibited numerous convergence difficulties. The program has been modified in-house at MSFC to correct the errors and greatly improve the convergence. The modifications consist of significant changes in the problem formulation and nonlinear convergence procedures. The original approach utilized sequential convergence for nested loops to achieve final convergence. This approach proved to be seriously deficient in robustness. Convergence was more the exception than the rule. The approach was changed to iterate all variables simultaneously. This approach has the advantage of using knowledge of the effect of each variable on each other variable (via the system Jacobian) when determining the incremental changes. This method has proved to be quite robust in its convergence. This technical memorandum documents the changes required for the original Theoretical Manual and User's Manual due to the new approach.
Document ID
19970015006
Acquisition Source
Marshall Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Ryan, S. G. (NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1997
Subject Category
Mechanical Engineering
Report/Patent Number
NAS 1.15:108532
NASA-TM-108532
Accession Number
97N18159
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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