Precision analysis and optimization of circumferential moving device
WEI Kai, LUO Luping
（Key Laboratory of E&M （Ministry of Education）, Zhejiang University of Technology, Hangzhou 310014, China）
 

Abstract: 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 multibody 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.
Key words: precision reliability; MonteCarlo method; precision analysis; optimization in precision distribution