氢气循环泵的转子动力学特性分析

Dynamic Characteristics Analysis of Rotors in Hydrogen Circulation Pump

摘要:

基于ANSYS构建了用于燃料电池汽车氢气供应系统的氢气循环泵（罗茨泵）转子系统的模型，通过对转子系统的模态分析，得到了独立转子系统和双转子系统的前六阶固有振型和固有频率。在模态分析的基础上分析了转子系统的谐响应特性，获得了齿轮、叶轮边缘两个部位的谐响应特性曲线。结果表明：轴端、转子叶轮等结构振动变形量较大，在接近前三阶固有频率（960Hz左右）时转子系统振动响应幅值最大，双转子耦合系统相对于单独转子系统会出现更加复杂的振型，转子叶轮对不平衡量的响应更显著。研究将为氢气循环泵转子系统的设计制造和振动特性预估提供积极的参考作用，并为氢气循环泵动力学特性的研究奠定基础。

关键词:罗茨泵;转子系统;动力学特性;模态分析;谐响应分析

Abstract:

A rotor system model was built based on ANSYS，which is used in the hydrogen circulation pump for fuel cell vehicles. Through the modal analysis of the rotor system， the first six natural frequencies and vibration modes of the single rotor system and the dual rotor system were obtained. Based on the modal analysis， the harmonic response characteristics of the rotor system were analyzed. The results show that the vibration deformation at the shaft end and rotor is relatively serious， and the vibration response amplitude is the largest when the vibration frequency is near the first three natural frequencies （960Hz）. The coupling effect will cause the rotor system to appear more complex vibration modes， and the rotor response to the unbalance is more significant. The research will provide a positive reference for the design， manufacturing， and vibration characteristic estimation of the hydrogen circulation pump rotor system， and lay the foundation for the study of the dynamic characteristics of the hydrogen circulation pump.

Key words:Roots pump;rotor system;dynamic characteristics;modal analysis;harmonic response analysis