多工位薄板装配偏差流传递的状态空间模型

STATE SPACE MODEL OF VARIATIONS STREAM PROPAGATION IN MULTISTATION ASSEMBLY PROCESSES OF SHEET METAL

借鉴控制理论中的状态空间方法,研究多工位薄板装配过程中偏差流传递、变换和累积关系的状态空间模型。以零件偏差为状态矢量,夹具偏差为控制矢量,研究夹具偏差和零件偏差之间的对应关系以及零件在工位间转换过程中的重定位偏差,建立多工位装配过程偏差流传递的状态方程;以零件测量偏差为输出矢量,建立表征测点位置和数量的输出方程。最后通过实际零件的装配过程说明该模型的应用方法。

State space model, which is based on the state space method in control theory, is applied to reveal the propagation, transformation and accumulation of part variations in multistation assembly processes （MAP）. Taking the fixture variations for input vectors and part variations for state vectors, a state function is built to represent the relationships between fixture variations and part variations, also the reorientation variations when assemblies are transformed between different stations. Taking the measurement values of parts for output vectors, an output function is built to represent the number and position of the sensors. Finally, a real MAP case in automotive assembly line is given to illustrate the method presented.