Abstract: Aiming at the lightweight design of automobile structures, a design method for automobile structure's reliability with uncertain manufacturing accuracy is proposed. The main design variables are regarded as interval variables, while other design parameters are regarded as probability values. On this basis, the reliability design method with uncertain manufacturing accuracy of automobile structures is established by using the transformation method of interval models and the decoupling strategy of probability models. The optimal solution and the maximum allowable deviation ranges under different reliability requirements are obtained through example analysis, which verifies the effectiveness of the method. The optimized design results show that the optimal variables and the corresponding maximum allowable deviation range can be obtained under acceptable manufacturing conditions. By appropriately increasing the deviation range of design variables, the requirements for manufacturing accuracy can be reduced, thereby reducing manufacturing costs.

Key words: vehicle structure, lightweight design, uncertainty, reliability design