凸轮机构两质量动力学模型的运动误差及接触力分析

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The limitation of linear single-degree-of-freedom one-mass model was analyzed, and two-mass dynamic model was built by lumped parameters. The displacement of follower, the out- put error of the cam-follower system and the contact force between the cam and follower were an- alyzed through assuming the displacement function of the cam was cosine. The results of two- mass model were simulated by a design example. The results show that the kinematics error, contact force and relationship between angle velocity of the cam and kinematic error and contact force got by the two-mass model are very useful to the actual design of cam mechanism.针对凸轮机构线性单质量、单自由度动力学模型的局限性，利用集中参数法提出了一种两质量的动力学模型．以凸轮输出为余弦运动形式为例，分析了两质量动力学模型中从动件的输出位移、输出误差及凸轮与从动件间的接触力，并以一个设计实例进行了求解．结果表明：由两质量模型可以得到机构的运动误差、凸轮与从动件间的接触力及凸轮转速对运动误差和接触力的影响．这些结果对凸轮机构的设计具有一定的指导意义．