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首页> 外文会议>ASME Turbo Expo 2006: Power for Land, Sea, and Air vol.5 pt.B: Structures and Dynamics: Mechanics and Vibration; Unsteady Aerodynamics; Rotor Dynamics and Magnetic Bearings >A VIRTUAL TOOL FOR PREDICTION OF TURBOCHARGER NONLINEAR DYNAMIC RESPONSE: VALIDATION AGAINST TEST DATA
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A VIRTUAL TOOL FOR PREDICTION OF TURBOCHARGER NONLINEAR DYNAMIC RESPONSE: VALIDATION AGAINST TEST DATA

机译：一种用于预测涡轮增压器非线性动力响应的虚拟工具：针对测试数据的验证

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摘要

Advances on the modeling of nonlinear rotor-bearing models for prediction of the dynamic shaft response of automotive turbochargers (TCs) supported on floating ring bearings (FRBs) are presented. Comprehensive test data for a TC unit operating to a top speed of 65 krpm serves to validate the model predictions. The static forced performance of the support FRBs considers lubricant thermal effects, thermal expansion of the shaft and bearings, and entrance pressure losses due to centrifugal flow effects. The bearing analysis also yields linearized rotordynamic force coefficients for the inner and outer lubricant films. These coefficients are used with the rotor model to predict the synchronous response to imbalance and the system natural frequencies and stability. A method renders an accurate estimation of the test rotor imbalance by using the actual vibration measurements and influence coefficients derived from predictions using linearized bearing force coefficients. Predicted ring rotational speeds, operating radial clearances and lubricant viscosities for the inner and outer films are the main input to the nonlinear time transient analysis. The nonlinear response model predicts the total shaft motion, with FFTs showing the synchronous response, and amplitudes and whirl frequencies of subsynchronous motions. The predicted synchronous amplitudes are in good agreement with the measurements, in particular at high shaft speeds. The nonlinear analysis predicts multiple frequency subsynchronous motions for speeds ranging from 10 krpm to 55 krpm (maximum speed 70 krpm), with amplitudes and frequencies that correlate well with the test data. The comparisons validate the comprehensive rotor-bearings model whose ultimate aim is to save TC design time and accelerate product development.
机译：提出了非线性轴承模型的建模进展，以预测浮动环轴承（FRB）上支撑的汽车涡轮增压器（TC）的动态轴响应。最高运行速度为65 krpm的TC装置的综合测试数据可用于验证模型预测。支架FRB的静态强制性能考虑了润滑剂的热效应，轴和轴承的热膨胀以及由于离心流动效应而引起的入口压力损失。轴承分析还得出了内部和外部润滑膜的线性转子动力系数。这些系数与转子模型一起用于预测对不平衡的同步响应以及系统的固有频率和稳定性。一种方法通过使用实际的振动测量值和从使用线性轴承力系数的预测得出的影响系数来准确估算测试转子的不平衡。内，外膜的预测环转速，工作径向间隙和润滑剂粘度是非线性时间瞬态分析的主要输入。非线性响应模型可预测整个轴的运动，其中的FFT表示同步响应，以及次同步运动的振幅和旋转频率。预测的同步振幅与测量值非常吻合，尤其是在高轴转速下。非线性分析预测速度在10 krpm至55 krpm（最大速度70 krpm）范围内的多频率次同步运动，其幅度和频率与测试数据紧密相关。这些比较验证了完整的转子轴承模型，其最终目的是节省TC设计时间并加快产品开发。

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