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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Nonlinear Rotordynamics of Automotive Turbochargers: Predictions and Comparisons to Test Data
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Nonlinear Rotordynamics of Automotive Turbochargers: Predictions and Comparisons to Test Data

机译：汽车涡轮增压器的非线性转子动力学：测试数据的预测和比较

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摘要

Passenger vehicle turbochargers (TCs) offer increased engine power and efficiency in an ever-competitive marketplace. Turbochargers operate at high rotational speeds and use engine oil to lubricate fluid-film-bearing supports (radial and axial). However, TCs are prone to large amplitudes of subsynchronous shaft motion over wide ranges of their operating speed. Linear rotordynamic tools cannot predict the amplitudes and multiple frequency shaft motions. A comprehensive nonlinear rotordynamics model coupled to a complete fluid-film-bearing model solves in real time the dynamics of automotive turbo-chargers. The computational design tool predicts the limit cycle response for several inner and outer film clearances and operating conditions including rotor speed and lubricant feed pressure. Substantial savings in product development and prototype testing are the benefits of the present development. The paper presents predictions of the linear and nonlinear shaft motion of an automotive turbocharger supported on a semi-floating ring bearing. The shaft motion predictions are compared to measurements of shaft motion at the compressor nose for speeds up to 240 krpm, and for lubricant inlet pressure of 4 bar at 150℃. Linear and nonlinear rotordynamic models reproduce very well the test data for synchronous response to imbalance. The nonlinear results show two subsynchronous whirl frequencies whose large magnitudes agree well with the measurements. A large side load predicted for this turbocharger must be considered for accurate prediction of the rotordynamic response.
机译：乘用车涡轮增压器（TC）在竞争激烈的市场中提供了更高的发动机功率和效率。涡轮增压器在高转速下运行，并使用发动机油润滑带液膜的轴承座（径向和轴向）。但是，TC在很宽的运行速度范围内易于出现较大的次同步轴运动幅度。线性转子动力工具无法预测振幅和多频轴运动。全面的非线性转子动力学模型与完整的液膜轴承模型相结合，可以实时解决汽车涡轮增压器的动力学问题。该计算设计工具可预测几种内部和外部薄膜间隙以及包括转子速度和润滑剂进料压力在内的运行条件的极限循环响应。产品开发和原型测试的大量节省是当前开发的好处。本文介绍了半浮动环形轴承上支撑的汽车涡轮增压器的线性和非线性轴运动的预测。将轴运动预测与压缩机机头处的轴运动测量值进行比较，以获取最高240 krpm的转速以及在150℃下4 bar的润滑剂入口压力。线性和非线性转子动力学模型可以很好地重现测试数据，以对不平衡现象进行同步响应。非线性结果显示两个次同步旋转频率，其大幅度与测量值非常吻合。为了准确预测转子动力响应，必须考虑为该涡轮增压器预测的较大的侧向载荷。

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