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Critical Speed Analysis of a Mixed-Flow Turbine Turbocharger in Hybrid Ceramic Ball Bearing

机译：混合陶瓷球轴承中的混流式涡轮增压器的临界转速分析

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In view of the ball bearings having the advantage over floating bush bearings, that will been used in vehicle turbocharger widely. This paper describes the calculation and analysis methods of the critical speed for vehicle turbocharger. The critical speed is computed by two methods including Riccati transfer matrix and DyRoBeS finite element method for HP60Q Mixed-Flow Turbine turbocharger in Hybrid Ceramic Ball Beating for vehicle. The vibration experiment had been taken to validate the calculating result. The results by two calculation methods, compared with the test results show that the first critical speed discrepancy is 6.47% and 2.87%, the second critical speed is 5.66% and 2.94% separately. The critical speed on different bearing rigidity and different turbine material had been computed and analyzed, so that we have get these factors how to effect on critical speed. And the conclusions will be helpful for the vehicle turbocharger bearing-rotor system design.
机译：鉴于球轴承具有优于浮动衬套轴承的优点，将广泛用于车辆涡轮增压器中。本文介绍了车辆涡轮增压器临界转速的计算和分析方法。通过车辆混合陶瓷球打浆中的HP60Q混流涡轮增压器，采用Riccati传递矩阵和DyRoBeS有限元方法两种方法来计算临界转速。通过振动实验验证了计算结果。两种计算方法的结果，与试验结果相比，第一临界速度差异分别为6.47％和2.87％，第二临界速度分别为5.66％和2.94％。对不同轴承刚度和不同涡轮材料的临界转速进行了计算和分析，从而得到了这些因素如何影响临界转速。结论对汽车涡轮增压器轴承－转子系统的设计将有帮助。

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