Pseudo-Random Binary Sequence Forcing in Journal and Squeeze-Film Bearings

The need is established for the experimental determination of linearized bearing oil-film coefficients. General methods of dynamic testing are discussed and previous attempts to measure bearing coefficients are reviewed. Three criteria for assessing the suitability of any test procedure for estimating linear bearing coefficients are formulated and used to show that improved techniques are still required. A new test procedure using pseudo-random binary sequence forcing is described and is shown to possess several attractive advantages compared with more traditional methods of dynamic testing. The method is applied to determine the linear characteristics of a prototype squeeze-film bearing and some experimental results are presented. Presented at the 33rd Annual Meeting in Dearborn, Michigan, April 17–20, 1978

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