弹性环阻尼器对涡轮增压器转子动力性能影响研究

摘要

以高速涡轮增压器滚珠轴承转子系统弹性环阻尼器(ERSFD)为研究对象,采用有限元分析以及挤压油膜理论对弹性环支承刚度、油膜压力场分布、油膜刚度阻尼以及滚珠轴承转子系统动力学特性等进行了分析研究,并与挤压油膜阻尼器(S F D)进行对比分析.研究发现,弹性环阻尼器的交叉刚度和阻尼很小,有效地改善了挤压油膜阻尼器刚度阻尼自由度耦合问题,刚度阻尼的非线性得到明显的抑制.采用六凸台弹性环阻尼器与滚珠轴承串联组合的增压器进行了台架试验,并与动力学计算结果进行了对比分析.%An elastic ring squeeze film damper (ERSFD) used in the ball bearing rotor system of a high speed turbocharger was studied .Based on the finite element analysis(FEA) and oil film squeezing theory ,the support rigidity of elastic ring ,the pressure field distribution of oil film ,the rigidity damping of oil film and the rotor dynamic characteristic of ball-bearing rotor system for ERSFD were analyzed and compared with the squeeze film damper (SFD) .It was found that the cross rigidity and cross damping of ERSFD were very small ,which could solve the coupling problem of SFD rigidity damping effectively so as to improve its nonlinear property obviously .The vibration of bearing housing on a ball bearing turbocharger with six convex sta-ges ERSFD was measured on a test bench and compared with the rotor dynamics computation results .