挤压油膜阻尼器-滑动轴承转子系统动力学分析与优化设计  

The dynamic analysis and optimization design to squeeze film damper-sliding bearing flexible rotor system

作　　者：冯武卫[1] 赵玉成[2] 王明[2] 

机构地区：[1]浙江海洋学院船舶与海洋工程学院,舟山316000 [2]中国矿业大学力学与建筑工程学院,徐州221116

出　　处：《应用力学学报》2014年第1期80-84,7,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金重点项目(50834004);浙江省科技厅重大科技专项社会发展项目(2013C13SAA10007)

摘　　要：为了对挤压油膜阻尼器-转子系统中挤压油膜阻尼器(SFD)的各项参数进行优化设计,使转子系统的动力学性能达到最佳状态,本文综合运用转子动力学和油膜润滑基本理论以及数值分析方法,对SFD-滑动轴承转子系统的灵敏度及动力学优化进行了系统研究。灵敏度分析结果表明:轴承间隙c1、SFD间隙c2、油粘度η对转子系统的一阶临界转速的影响较大;SFD间隙c2、轴承间隙c1、转轴刚度K2对二阶临界转速的影响较大。据此得到优化的设计变量为c1、c2、η、K2,并采用遗传算法对临界转速进行了优化分析;经过优化后,系统的一阶、二阶临界转速差值由原来的510rad/s变为860rad/s,系统动力学性能得到较大改善。本文的优化设计结果可为此类转子系统的设计提供参考。The parameters of squeeze film damper(SFD) rotor system have definite influences on the dynamic characteristics, however, not any arbitrary SFD can increase rotor system stability and vibration damping,therefore, Therefore, improving the dynamical characteristics of rotor system through optimization design of the parameters of the SFD within a reasonable range is very important. In this paper, comprehensively applying the basic theory of rotor dynamics and film lubrication and numerical analysis to sensitivity of SFD-sliding bearing rotor system and dynamic optimization are studied. The results show that: bearing clearance c1,SFD clearance c2and oil viscosity η have great effects on the first critical speeds and bearing clearance c1,SFD clearance c2oil viscosity and shaft stiffness K2have great effects on the??second critical speeds(possessing greater sensitivity coefficient). Based on design variables of sensitivity analysis, to genetic algorithm is adopted to give an optimization analysis on critical speed. After optimization, the 1st, 2nd order critical speeds change from510rad/s to 860rad/s, the system dynamic performance is greatly improved. The critical speed ameliorates after the optimization. It provides a reference for the design of such rotor system.

关 键 词：SFD 转子系统 临界转速 灵敏度 优化 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]