环形移动装置的精度分析与优化研究

Precision analysis and optimization of circumferential moving device

针对环形焊缝自动焊接装置中移动装置存在的低精度、高成本等问题,将精度可靠性的评价方法应用到移动装置的精度分析与优化中。基于多体系统理论建立了移动装置的误差模型,采用蒙特卡洛法对移动装置的运动误差进行了精度分析。以精度分析中误差敏感度的分析结果为基础,建立了以移动装置制造成本最低为优化目标、以满足精度可靠性设计要求为性能约束的移动装置精度分配优化模型,利用多岛遗传算法与蒙特卡洛法相结合对移动装置的误差源进行了精度分配优化设计。研究结果表明,移动装置经过优化后,精度可靠性达到设计要求,且与经验设计相比,制造成本降低19.1%,为环形移动装置的加工制造提供了依据。

Aiming at the low precision and high cost of the moving device of automatic welding device for circumferential weld,precision reliability index was used in precision analysis and optimization. An error model of moving device was established through utilize of the multibody system theory,and the motion error was simulated by using Monte-Carlo method. With the minimum manufacture cost of moving device set to be design object and the precision reliability set to be performance constraint,an optimization model for distribution of the error parameters for the moving device was established based on the simulation of the error sensibility. Then,the optimization was carried out by combining the multi-island genetic algorithm with Monte Carlo method. The results indicate that the precision reliability of moving device satisfies the design requirement and the cost decreases by 19. 1% compares with experience design after optimization. Therefore,this optimization can provide basis for the manufacture of the circumferential moving device.