Abstract: In order to eliminate the high interior noise of a SUV under WOT case,analyzing the reason to the high interior noise,and the mount bracket has obvious resonance at the corresponding frequency based on the test data,diagnosis and analysis,the design of mount bracket has significant influence on vehicle interior noise.Referring to the test and simulation result of the original transmission bracket,topology optimization technology was applied to optimize it,and the first order modal frequency and stiffness of the transmission bracket have been improved as simulation analysis result show after it is optimized.And the road test result of SUV under WOT case also shows that the interior resonance band and noise significantly reduced after the optimized sample installed.

Key words: interior noise, mount bracket, topology optimization, modal frequency