Analysis And Optimization Of Automotive Interior Mid-frequency Noise Based On Hybrid FE-SEA Method

The noise in the vehicle is one of the most important indices which have a great impact on the comfort of the automobile. Mid-frequency noise is one of the most important parts in the automobile. Thus, it is of great significance to research and improve the automotive interior mid-frequency noise. Reaching and improving the interior mid-frequency noise at the early stage of product development will reduce the development cost and cycle. Automotive hybrid FE-SEA model was built based on the hybrid FE-SEA method. This article obtained the relevant parameter through experiment and calculation. The influence of the sealing system and the parameters of porous materials were studied on the automotive interior mid-frequency noise. The content in detail is listed as follows:The hybrid FE-SEA conception and basic theory was introduced in this research based on amounts of papers. The transmission of energy in the theory of hybrid FE-SEA method was analyzed in this article.The hybrid FE-SEA model of the automobile was built based on the finite element model of a passenger automobile. The relevant parameters were obtained through experiment and calculation. The excitations and interior sound pressure level responses were measured in semi-anechoic room at three different conditions of idle, 60 km/h and 100 km/h.Mid-frequency noise was predicted through the hybrid FE-SEA model under three different conditions, including idling, uniform velocity at 60 km/h and 100 km/h. The validity of the hybrid FE-SEA model was performed through making a comparison of the experiment results and prediction results. The influence of the simplified sealing system on the simple case was researched, and the impact of the sealing system on the automobile was also studied in this article. Thus, the impact of sealing system on the automotive interior mid-frequency noise was analyzed from easy to difficult.The influence of the parameters of porous materials on automotive interior mid-frequency noise was researched through the hybrid FE-SEA.model. The plates which contribute most to the interior mid-frequency noise were found by making an analysis of the contribution to acoustic cavity subsystems. Then, the interior mid-frequency noise of the automobile was optimized through multi-island GA based on Latin hypercube design after the Kriging model was created.