考虑密封结构的球轴承涡轮增压器转子动力学特性研究

【摘要】：针对某型号车用球轴承涡轮增压器，利用密封力与油膜力动力学相似原理，将增压器转子系统中的密封结构视为一种油膜轴承，应用短轴承理论计算得到其刚度和阻尼矩阵并代入模型进行仿真计算，并与临界转速实验结果和未添加密封结构模型的计算结果进行对比，得到了密封结构对增压器转子系统临界转速、稳定性、不平衡响应的影响规律。结果表明：研究分析球轴承涡轮增压器转子动力学特性必须考虑密封结构，且可以应用短轴承理论分析密封结构动力学特性。

Rotor dynamics analysis for ball bearing turbocharger considering the sealed construction

For some type of turbocharger,the sealed construction on the turbocharger rotor can be regarded as a special kind of oil film bearing as the dynamic principles for sealing force and film force are both similar.The stiffness and damping matrixes,of the sealed construction calculated by using short bearing theory,were added to form a simulation model of the complete rotor system.The calculated results of the dynamic characteristics of the rotor system were compared with the experimental ones and also compared with the simulation results of a rotor system without sealed construction.The effects of sealed construction on critical speed,stability and unbalance response were revealed by this way.The conclusion shows:the sealed construction is of essence in the rotor dynamics analysis for ball bearing turbocharger,and here the short bearing theory is still available.