The equations of motion of rotating machines subjected to seismic motions are quite complex, consisting of asymmetric general matrices with parametric and gyroscopic terms. Fortunately, the parametric and some other terms causing analytical complications can be ignored. This enables one to analyze rotating machines by a generalized modal analysis approach. This approach is used to develop a response spectrum approach for calculating the seismic design response for design inputs defined by response spectrum curves. Applicability of this proposed approach to rotor-bearing systems is verified through a time history ensemble analysis.
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Singh et al. (1992) studied this question.
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