关键词: 空间RSSR机构, 区间分析, 偏差分析, 间隙, 运动仿真

Abstract: Aiming at the assembly deviation analysis problem of spatial Revolute-Spherical-Spherical-Revolute(RSSR) crank-rocker mechanism,the interval models including gap deviation and rod length deviation were established based on interval analysis and triangular fuzzy number.The deviation loop and nonlinear interval parameter equations were constructed,and the equations were solved.The motion simulation of spatial RSSR mechanism was carried out,and the nominal data of output angle was obtained.Compared with the results of nonlinear interval parameter equations,the angular deviation curve and comparison curve of angular deviation under different membership value were drawn.The influence of the joint clearance variation and the rod length deviation on output angular displacement deviation of the mechanism was analyzed,and the analysis results showed that the deviation of clearance and rod length had a significant impact on the output angular displacement near the minimum and maximum points of the output angular displacement curve.The larger the deviations of joint clearance and rod length were,the greater impact on the output angular displacement deviation was.The output angular displacement deviation of the mechanism was significantly decreased by adjusting the membership value to a suitable value.

Key words: spatial RSSR mechanism, interval analysis, deviation analysis, clearance, motion simulation