Abstract: To improve NVH performance and to reduce noise of cars,plate thickness optimization of cars′ body structure should be taken.Developed a valid meta-model of the car,and chose thickness of head cover,floor,glass of rear door,glass of left back door and left rear door,which are with high body module contribution degree,as our optimization variable.Have designed and developed response model of target basing on optimal Latin experiment,and have verified the reliability.Have made optimized analysis on response model with MIGA.Inside noise is reduced after that,which proves that the method is with high veracity and validity.

Key words: vehicle interior noise, optimization, contribution of acoustics, response surfaces, MIGA