车用球轴承涡轮增压器临界转速分析

阐述了增压器轴承—转子系统临界转速的计算分析方法,以某车用球轴承涡轮增压器为例,分别采用Riccati传递矩阵法和DyRoBeS有限元法计算了临界转速,并进行了试验验证。由两种计算方法所得到的1阶和2阶临界转速值与试验值比较,1阶相差5.59%与1.42%,2阶相差2.53%与8.40%。同时,计算分析了轴承刚度、轴承结构尺寸、涡轮材质等参数对增压器临界转速的影响,得到了相关曲线。

Critical Speed Analysis on Vehicle Turbocharger with Ball Bearings

The calculation and analysis methods of the critical speed for vehicle turbocharger were described. The critical speed was computed with two methods like Riccati transfer matrix and DyRoBeS finite element method for a vehicle turbocharger with ball bearings and was validated by the experiment. It was found by comparing the calculated results and the experimented results that the first critical speed differences between them were 5.59% and 1.42% and that the second critical speed differences between them were 2.53% and 8.4%. Besides these, The effects of bearing rigidity, bearing structure and turbine material on the critical speed were analyzed and the relative curves were acquired.