Accuracy evaluation of experimentally derived dynamic coefficients of fluid film bearings. I: Development of method

The goal of many experimental studies of fluid film bearings is the determination of the eight linearized stiffnes and damping coefficients. These coefficients cannot be measured directly; they are derived from a series of other measurements. In many cases, the coefficients are found by applying known steady-state sinusoidal loads to excite a journal on a rigid rotor and measuring the resulting displacement, velocity, and acceleration orbits. This paper relates how uncertainties in these measurements affect the accuracy of the derived coefficients. The analysis can also be used for the proper selection of test procedures and transducers to measure the primary variables and estimate results beforehand

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