【作者】 周海仑；

【导师】 陈果；

【作者基本信息】 南京航空航天大学 ， 载运工具运用工程， 2013， 博士

【摘要】 针对传统挤压油膜阻尼器(Traditional Squeeze Film Damper，简称TSFD)挤压油膜高度非线性等带来的一系列问题，本文开展了新型浮环式挤压油膜阻尼器（Floating-ring Squeeze FilmDamper，简称FSFD）及其转子系统动力学特性的研究，本文主要的研究工作和成果如下：（1）分别从广义雷诺方程和挤压油膜阻尼器雷诺方程出发，建立了两种FSFD模型，进行了两种模型理论分析，结果表明两个模型所得到的系统响应误差小于4%；利用双向激励试验器，对FSFD特性进行了试验研究与验证，验证两了种模型的正确性。另外，借助于单自由度系统的幅频响应特性，研究了FSFD的减振机理。研究结果为FSFD动力特性分析与应用提供了理论基础。（2）不考虑和考虑非线性滚动轴承力，分别建立了含FSFD的转子系统动力学模型，仿真计算表明，与TSFD相比，FSFD能更好地抑制双稳态、非协调进动和突加不平衡响应；并详细地研究了FSFD、滚动轴承、转子参数对含FSFD转子系统双稳态响应、非协调进动响应和突加不平衡响应的影响。通过对转子系统幅频响应特性分析表明：浮环质量越大，滑油黏度越大，FSFD的减振性能越好，反之则越差。通过试验研究表明，与TSFD相比，FSFD能更好地抑制转子系统的双稳态响应。（3）研究了浮动环带弹性支承时两种FSFD的动力学特性：只有一层油膜时，该型阻尼器在抑制转子系统的非协调进动和突加不平衡响应的性能均优于TSFD；通过调节浮动环弹性支承刚度和浮动环外加阻尼的方式可抑制转子系统双稳态响应，但转子系统在临界转速时的位移响应增大；在抑制双稳态、非协调进动和突加不平衡响应的性能均比FSFD差。有两层油膜时，它在抑制双稳态、非协调进动和突加不平衡响应方面的性能均优于一层油膜的FSFD和TSFD；在抑制双稳态、非协调进动和突加不平衡响应的瞬态振幅性能都弱于FSFD。因此，FSFD具有良好的工程应用前景。（4）基于非线性FSFD、TSFD和滚动轴承模型，建立了含FSFD/TSFD-滚动轴承-双转子系统的动力学模型，研究表明：中介轴承和高压转子支承轴承间隙对双转子系统的响应频谱特性影响明显；FSFD在双转子系统中能更好地抑制非协调进动响应；同时双转子系统碰摩故障响应频谱更为丰富。这为含FSFD/TSFD-滚动轴承-双转子系统的动力特性分析和故障诊断提供了参考。本文的研究内容为FSFD的研究以及含FSFD单/双转子系统的研究，提供了理论模型和研究基础，为FSFD的工程应用提供了理论参考。更多还原

【Abstract】 To prevent a series of problems caused by nonlinear stiffness and damper of traditional squeezefilm damper (TSFD), dynamic responses of a rotor supported on floating-ring squeeze film dampers(FSFD) are studied in this paper. The main work and results of this paper are briefly summarized asfollows:(1) Two dynamic models of FSFD are established. One model is based on the general Reynoldsequation, and the other model is based on the Reynolds equation of squeeze film damper. The mosterror value of system response with two different models is less than4%. To validate the two models,a non-rotating test rig excited by two orthogonally placed shakers is established. Good consistency isachieved between the experiment and simulation results with two different models. Two models arevalidated. In addition, the vibration attenuation mechanism of FSFD is studied by means ofamplitude-frequency response characteristic of single degree of freedom system. The results provideresearch foundation for further analyzing and applying FSFD.(2) Two dynamic models of a rotor supported on FSFD are established respectively with orwithout nonlinear force of ball bearings. Numerical results show that the performances of FSFD inpreventing bistable, non-synchronous and suddenly applied unbalance response are better than TSFDon the same computation conditions. The effects of parameters of FSFD, ball bearing and rotor havealso been numerically investigated in preventing bistable, non-synchronous and suddenly appliedunbalance response. According to the amplitude-frequency response of the rotor system, it shows thatthe greater mass of floating-ring and viscosity of lubrication oil, the greater is the damping property,vice versa. Comparing to TSFD, FSFD has a better performance in preventing bistable response in theexperiment.(3)Two different FSFD are studied, one has single layer film, which is named as FSFDS; and theother has double layers film, which is named as FSFDD, and each floating-ring has an elastic support.The performances of FSFDS in preventing non-synchronous and suddenly applied unbalance responseare better than TSFD; FSFDS is effective in preventing bistable response at the cost of increasedvibration at the first critical speed. The performances of FSFDS in preventing bistable,non-synchronous and suddenly applied unbalance response are worse than FSFD. The performancesof FSFDD in preventing bistable, non-synchronous and suddenly applied unbalance response arebetter than TSFD and FSFDS. But the performances of FSFDD in preventing bistable,non-synchronous and transient amplitude of suddenly applied unbalance response are worse thanFSFD. Therefore, the FSFD possesses a good prospect of engineering application.(4) Based on the models of nonlinear FSFD, TSFD and ball bearing, a dynamic model of a dualrotor supported on ball bearings with FSFD/TSFD is established, the main conclusions are brieflysummarized as follows: the clearance of intershaft bearing and support bearing have significantinfluence on the response frequency of dual rotor system. FSFD can more effectively in preventingnon-synchronous response of dual rotor system than TSFD. More frequency component will appear inthe response of dual rotor system including rubbing fault. It provided theory reference for dynamic characteristic analysis and Fault Diagnosis of FSFD/TSFD-ball bearing-dual rotor system.The research of this paper provided theoretical model and research foundation for furtherresearching FSFD and dynamic responses of a rotor supported on FSFD. It also provided theoryreference for engineering application of FSFD.更多还原