杆长误差和运动副间隙对平面机构运动可靠性的影响分析  

Influence of rod length error and kinematic pair gap on the motion reliability of plane mechanism

作　　者：杨晓 YANG Xiao

机构地区：[1]四川省广汉市职业中专学校,四川广汉618300

出　　处：《现代机械》2023年第5期73-77,共5页Modern Machinery

摘　　要：在考虑平面机构杆件误差和运动副间隙的基础上,建立了基于概率的平面机构运动模型,通过蒙特卡洛方法对曲柄滑块机构的运动可靠度进行分析,分析表明:在转动过程中,曲柄滑块机构的可靠性呈周期性变化;当仅考虑杆长误差的情况下,曲柄转角为(π/2,π)∪(π,3π/2)范围内出现最高失效概率;当仅考虑运动副间隙的情况下,曲柄转角为π/2和3π/2时失效概率最高;杆件误差和运动副间隙的共同作用将会导致机构可靠性快速降低。In this paper,a probabilistic motion model based on rod length error and kinematic pair gap is established,and the motion reliability of the crank slider mechanism is analyzed by the Monte Carlo method.The analysis shows that the reliability of the crank slider mechanism varies periodically during the rotation process.If only the rod length error is considered,the highest failure probability appears when the crank angle is in the range of(π/2,π)∪(π,3π/2).If only the kinematic pair gap is considered,the highest failure probability appears when the crank angle is atπ/2 or 3π/2.The combined effect of rod length error and kinematic pair gap will lead to a rapid decrease in the reliability of the mechanism.

关 键 词：平面机构 误差模型 运动模型 可靠性 

分 类 号：TH112[机械工程—机械设计及理论]