函数生成机构运动误差的随机特性分析

本资料包含pdf文件1个，下载需要1积分

函数生成机构的运动误差是机构构件尺寸和输入运动（时间）的函数,同时构件尺寸公差具有随机性;因此机构运动误差在其运动行程内某时间点上为随机变量,在整个运动行程上为随机过程。基于平面四杆函数生成机构的运动误差模型,推导了误差过程的均值、标准差、自相关函数、自协方差函数的解析表达。数值分析表明,含结构误差和随机误差的机构运动误差为一普遍随机过程。 The motion error of function generation mechanisms is the function of dimension parameters and input motion（or time）.Considering randomness of tolerance,the motion error function is a random variable at a time point of the motion range of mechanisms.But it is a stochastic process over the all of motion range.Based on motion error model of planar four-bar function generator,the analytic equations of mean value function,standard deviation function,autocorrelation function and autocovariance function are derived.The numerical results show that the motion error,which includes structure error and random error,is a general stochastic process.