According to the relation criterion that oil whip happens when the driving frequency is greater than twice the first critical speed of rotor system, the reliability mode and system reliability index are defined. The reliability sensitivity analysis method of avoiding oil whip in rotor system with gyroscopic moment is carried out. The variation regularities of reliability sensitivity are obtained and the effects of design parameters on reliability of rotor system are studied. The presented method in this paper provides a theoretic basis for the reliability-based optimization design of rotor system.
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