基于稳健性的乘用车前下控制臂设计优化

Design optimization of front lower control arm for passenger car on the basis of robustness

本文对汽车前下控制臂的屈曲强度进行CAE分析及试验验证,并基于失效模式进行设计评审(DRBFM),发现球头球心相对于控制臂本体的垂向位置对屈曲变形的失效模式较为敏感。基于QFD和田口方法,通过设计优化,使产品性能足够抵抗制造公差的干扰,按照功能要求实现一种稳健的失效模式,并完成有效性试验验证。通过应用六西格玛设计理念,实现产品质量的先期策划。

CAE analysis and test verification have been performed to buckling strength of the automobile front lower control arm. The DRBFM has been conducted on the basis of failure mode. It is found out that the vertical position of ball joint center relative to control arm body is sensitive to the buckling failure mode. The design has been optimized to minimize the effect of manufacture tolerance to achieve an expected and robust failure mode as per functional demands on the basis of QFD and Taguchi method. The effectiveness has been tested and verified. The advanced planning of product quality has been performed by applying the DFSS.