基于间隙连接件和多维矢量环的机构装配精度预测

Kinematic assembly precision prediction based on gap connectors and multidimensional vector loop

为了准确有效地实现机构装配的精度预测,提出一种基于间隙连接件和多维矢量环的精度预测方法。根据机构装配的特点,将其偏差源分为零件几何位置偏差、几何形状偏差和装配位置偏差三类;建立了装配间隙连接件模型,用间隙连接件的定向角描述零件的配合位置;定义了零件的基准参考结构,并基于装配约束建立了零件的基准路径和偏差传递路径、装配体多维矢量环和矢量方程;利用一阶泰勒展开和矩阵变换方法求解偏差源敏感度矩阵,进而用极值法得到了机构装配精度预测值。以某飞机内襟翼机构装配精度预测为例,验证了所提方法的有效性。

To achieve kinematic assembly precision prediction effectively and accurately, a precision prediction method was proposed based on gap connectors and multidimensional vector loop. According to characteristics of kinematic assembly, deviation source was divided into three types： geometric location deviation, geometric form variation and assembly part location deviation. The gap connections model was set up for kinematic assembly and parts fitting po- sition is described by the orientation angle of gap connections. Part＇s datum reference frame was defined, and datum path and deviation transfer path as well as assembly multidimensional vector loop and vector equations were estab- lished based on assembly constraints. The first order Taylor expansion and matrix transformation method were used to solve the assembly deviation source sensitivity and precision prediction value of kinematic assembly. The effec- tiveness and efficiency of the proposed method was verified by taking wing flap rocker as a research example.