针对曲柄群驱动机构运转过程存在较大振动和噪音的问题，根据平面连杆机构动平衡理论中质量矩替代法和动量矩替代法推导出曲柄群驱动机构的动平衡条件。利用 ADAMS软件建立刚性体六曲柄群驱动机构的动力学模型，并对比分析模型配重前后各曲柄固定转动副处的受载曲线，基于刚性体虚拟样机模型仿真结果得到机构刚柔耦合虚拟样机动平衡模型。该刚柔耦合模型仿真结果说明六曲柄群驱动机构摆动力和摆动力矩均得到了较好的平衡，揭示了只靠施加配重质量的曲柄群驱动机构并不能实现理想的动平衡效果。这种刚柔耦合的动平衡方法为进一步研究曲柄群驱动机构的动力学特性提供了新的思路。%Aiming at the problems of serious vibration and noise during the operation of the crank-group driving mechanism,the mass moment substitution method and the momentum moment substitution method in the dynamic balance theory of the planar linkage mechanism were used to derive the dynamic balancing condition of crank-group driving mechanism.Then ADAMS soft-ware package was utilized to establish the dynamic models of rigid six crank-group both before and after adding counterweight and the loading curve of crank’s fixed rotate pair of each model was comparatively analyzed.Based on the former simulation results of rigid virtual prototype model,the rigid-flexible coupling virtual prototype model of mechanism was obtained.The simu-lation results of rigid-flexible coupling dynamic balancing model showed that the unbalanced force and moment of six crank-group mechanism were well balanced.Therefore,the desired dynamic balancing effect can not be achieved by merely imposing counterweight mass so that the applica-tion of rigid-flexible coupling dynamic balancing method provide a new approach for the research of dynamic characteristics of crank-group driving mechanism.
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