耦合故障转子系统SFD参数多目标优化

Multi-Objective Optimization of SFD Operational Parameters for Rotor System with Coupling Faults

对于高速旋转的转子部件,振动的影响极其重要,而故障一旦发生,将破坏转子系统正常工作条件,产生噪音并引起振动加剧,如不加以控制,则会因振动过大造成机器损伤或严重破坏事故。工作参数合理的挤压油膜阻尼器(Squeeze film damper,简称SFD)通过提供适当粘性阻尼可有效抑制转子的振动幅值和故障所产生的非线性振动特征,若工作参数选择不当,其振动状态将比不加阻尼器情况更差。选取转子典型工况(转速ω=1000rad/s),以无故障、不对中故障及不对中-碰摩耦合故障转子系统振动特征幅值为优化目标,对SFD工作参数进行多目标优化。结果表明:不同故障状态下的转子系统,优化参数结果不同且对参数的敏感度不同;优化后的SFD能有效减小系统的振动幅值,无故障时1倍频幅值降低23%;不对中故障时1倍频幅值减小约43.4%,二倍频幅值减小约27.5%,三倍频幅值减小约66.7%;不对中-碰摩耦合故障时1倍频幅值减小约7.4%,2倍频幅值小约51.5%,3倍频幅值小约16.8%,验证了针对故障状态转子可变结构SFD工作参数优化方法的可行性。

The vibration of high speed rotating parts has great effect on the rotating machinery performance.The rotor faults will lead the rotor system into abnormal operation and produce noise and abnormal vibration.More seriously,the excessive vibration will lead the machinery damage without control.The Squeeze Film Damper(SFD)can provide viscous damping effectively and restrain the vibration amplitude of the rotor and nonlinear generated by fault,however,the SFD may lead the machinery into worse condition for the inappropriate parameters.Typical working conditions of the rotor whichω=1000rad/s is selected to optimize the vibration amplitude of rotor system with normal condition,the misalignment faults and misalignment-rubbing coupling faults,the multi-objective optimization method is used to optimize SFD structure.The results showed that when rotor system at different state,the value of optimization parameters is different and the sensitivity to parameters was also different.With no faults,the amplitude of one time frequency decrease 23%.With the misalignment faults,the amplitude of the one time frequency decrease 43.4%,the amplitude of two times frequency reduces 27.5%,the amplitude of three times frequency reduces 66.7%.With the misalignment rubbing coupling faults,the amplitude of one time frequency reduced 7.4%,the amplitude of two timed dropped 51.5%,the amplitude of three times frequency dropped 16.8%.The feasibility of the optimization method of the SFD operational parameters for the faulted rotor system with variable structure is verified.