Variable coefficients reciprocal squared model based on multi-constraints of aircraft assembly tolerance allocation

Abstract

In order to improve product quality and enhance economic returns, the research about tolerance allocation under multi-constraints including assembly and manufacturing accuracy is done. On the basis of cost-tolerance relationship, this paper introduces variable coefficients reciprocal squared model (VCRSM) into tolerance allocation process and thus constructs the tolerance allocation optimization objective model. Aiming at resolving multi-constraints problem within allocation process, the penalty items are added into allocation optimization objective model, and an analytic equation based on multi-constraints is proposed. The equation is solved using the Newton iteration method in consideration of the assembly and manufacturing accuracy constraints. Finally, a tolerance allocation instance about aircraft door component assembly is given. The numerical results show the method can achieve optimal tolerance allocation and the VCRSM is more suitable than other cost-tolerance models in multi-constraints tolerance allocation.