1.天津工业大学 机械工程学院, 天津 300387
2.天津工业大学 天津市现代机电装备技术重点实验室, 天津 300387
金国光(1963— ),男,辽宁葫芦岛人,教授,博士研究生导师;研究方向为机构学、系统动力学、柔性机构动力学。
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金国光,侯旭睿,魏展等.考虑运动副间隙的平面连杆机构动力学分析[J].机械传动,2022,46(09):59-66.
Jin Guoguang,Hou Xurui,Wei Zhan,et al.Dynamic Analysis of Planar Linkage Mechanism Considering the Clearance of Kinematic Pair[J].Journal of Mechanical Transmission,2022,46(09):59-66.
金国光,侯旭睿,魏展等.考虑运动副间隙的平面连杆机构动力学分析[J].机械传动,2022,46(09):59-66. DOI: 10.16578/j.issn.1004.2539.2022.09.008.
Jin Guoguang,Hou Xurui,Wei Zhan,et al.Dynamic Analysis of Planar Linkage Mechanism Considering the Clearance of Kinematic Pair[J].Journal of Mechanical Transmission,2022,46(09):59-66. DOI: 10.16578/j.issn.1004.2539.2022.09.008.
为了准确分析运动副间隙对机构动力学特性的影响,在Gonthier接触力模型基础上引入非线性刚度系数,得到改进的Gonthier模型,可以更加精确地描述运动副内的弹性力。基于平面四连杆机构并应用牛顿–欧拉方程,建立了含二状态间隙系统动力学方程;利用Adams软件仿真验证了间隙模型的正确性;分析不同间隙、转速、摩擦因数对机构摇杆加速度的影响,并研究了运动副内轴的接触、自由两种状态。结果表明,在一定条件下,轴在运动副内具有碰撞、接触、自由3种状态;系统稳定后,轴在运动副内始终处于接触状态,说明轴在运动副内的运动并不是随机碰撞;机构主要通过接触点变形产生的接触力而不是轴与轴承的碰撞力来传递动力。计算结果可以很好地预测间隙发生位置,对抑制间隙导致的机构振动、磨损等具有重要的理论价值。
In order to accurately analyze the influence of the kinematic pair clearance on the mechanism dynamic characteristics, a nonlinear stiffness coefficient is introduced based on the Gonthier contact force model, and an improved Gonthier model is obtained, which can more accurately describe the elastic force in the kinematic pair. The system dynamic equation of planar four-bar linkage with two-state clearance is established using Newton Euler equation, and the correctness of the clearance model is verified by Adams. The influence of different clearance, rotation speed and friction coefficient on the acceleration of the rocker is analyzed, and the contact and free states of the inner shaft of the kinematic pair are studied. The results show that the shaft has three states of collision, contact and freedom under certain conditions. After the system becomes stable, the shaft is always in contact with the kinematic pair, which indicates that the motion of the shaft in the kinematic pair is not random collision. The driving force of the mechanism is mainly transmitted by the contact force generated by the deformation of the contact point, rather than the collision force between the shaft and the bearing. The results can predict the position of the clearance, and have important theoretical value for restraining the vibration and wear of the mechanism caused by the clearance.
接触力模型运动副间隙碰撞动力学
Contact force modelClearance of kinematic pairCollisionDynamics
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