基于冲击模型的含间隙高速凸轮机构动力学分析  

Dynamic analysis of high speed cam mechanism with clearance based on impact model

作　　者：何雪明 何楷 武美萍 纪小刚 HE Xue-ming;HE Kai;WU Mei-ping;JI Xiao-gang(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi,Jiangsu 214122, China)

机构地区：[1]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122

出　　处：《食品与机械》2017年第9期84-89,93,共7页Food and Machinery

摘　　要：为了提高含间隙高速凸轮机构动态性能。采用二状态冲击副模型模拟凸轮和从动件间的间隙,构建考虑阻尼的含间隙凸轮机构动力学模型。以摆线凸轮曲线为激振函数,采用有限差分法求解动力学方程。对含间隙动力学模型进行时域和频域分析,绘制相应的加速度时域和频域响应图谱,得出了阻尼比、周期比对动态响应的影响,并对常用的几种高速凸轮曲线进行动力学分析。得出:间隙存在会导致系统响应精度变差;间隙对从动件升程加速段的影响较小;对减速段和休止期影响较大;传统理论在间隙动力学中的应用存在局限性。In order to improve the dynamic performance of cam mechanism with high clearance.The two-state impact sub-model is used to simulate the gap between the cam and the follower to construct the dynamic model of the gripping cam mechanism considering the damping.The finite difference method is used to solve the dynamic equation with the cycloidal cam curve as the excitation function.The time domain and frequency domain analysis of the gap dynamics model are carried out,and the corresponding acceleration time domain and frequency domain response map are drawn.The influence of the damping ratio and the cycle ratio on the dynamic response is obtained.Then,several high speed cam curves are kinetics analysis.It is concluded that the existence of the gap will lead to the deterioration of the response accuracy of the system.The effect of the gap on the accelerating section of the follower is small,which has a great influence on the deceleration and deceleration period.The application of traditional theory in gap dynamics is limited.

关 键 词：含间隙高速凸轮机构 动力学模型 时域分析 频域分析 

分 类 号：TH112.2[机械工程—机械设计及理论]