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以膨胀机子系统为研究对象,考虑静态传递误差,建立了斜齿轮啮合副动力学模型,同时考虑转子系统的影响,建立了三平行轴系齿轮转子系统有限元模型;对齿轮弯-扭耦合膨胀机子系统进行了不平衡响应分析,同时考虑轴承刚度、齿轮螺旋角对齿轮动态啮合力的影响。研究表明,膨胀机子系统因为齿轮的耦合振动而明显加剧,齿轮耦合使系统振型表现为耦合振型,因此必须以耦合的方式分析系统的振动特性;轴承处刚度及螺旋角对相对应的齿轮啮合处的动态啮合力影响很大,甚至使动态啮合力峰值发生了偏移,为转子系统轴承刚度的确定以及齿轮的设计都提供了较好的理论基础。
Taking the expander-machine system as the research object, the static transmission error was considered and the meshing kinetic model of helical gear was established. At the same time, considering the influence of the rotor system, the finite element model of gear system with three parallel shafts was established. The unbalanced response analysis of the machine system is carried out, taking into account the influence of bearing stiffness and helix angle on the dynamic meshing force of gears. The research shows that the expander subsystem is obviously aggravated by the coupling vibration of the gear, and the coupling of the gear causes the system vibration mode to be the coupling mode. Therefore, the vibration characteristics of the system must be analyzed by the coupling method. The dynamic meshing force at the meshing point is greatly affected, even the peak value of the dynamic meshing force is offset, which provides a good theoretical foundation for the determination of the bearing stiffness of the rotor system and the design of the gear.