油膜阻尼器--滑动轴承转子系统优化设计

摘要

挤压油膜阻尼器在一定程度上可以提高旋转机械系统稳定性。运用数值模拟的方法，对SFD―滑动轴承转子系统的灵敏度及动力学优化进行系统研究。研究表明：挤压油膜阻尼器间隙、轴承间隙、转轴刚度及油粘度对前两阶临界转速的影响较大，系统对这些参数的灵敏度相对较高。基于灵敏度分析得到优化的设计变量，采用遗传算法对临界转速进行了优化分析，优化目标是使工作转速尽可能远离临界转速。经过优化后，系统的临界转速得到较大改善。优化设计为提高高速转子系统的动力稳定性提供了理论基础和分析方法，从而为此类转子系统的设计提供参考。%The squeezed film damping (SFD) can improve the stability of rotary mechanical system. Applying numerical simulation method, the sensitivity of the rotor system and the dynamic optimization of the SFD-sliding bearings were studied systematically. The study shows that the SFD clearance, bearing clearance, shaft stiffness and oil viscosity have great effects on the critical speeds of the first two orders, and the system is more sensitive to these parameters than the others. Based on the design variables offered by the sensitivity analysis, genetic algorithm was employed for optimization analysis of the critical speed so that the working speed can keep away from the critical speed as far as possible. After the optimization, the critical speed was greatly ameliorated. This study has supplied a theoretical basis and analysis method for improving the dynamic stability of high-speed rotor systems.