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Vibration tests and modal analysis method were used to recognize cause of steering wheel's idle shaking, it was found that the steering wheel's operating modal was close to engine's second order excitation frequency, which caused steering wheel's idle shaking. Five improvements were presented to relief this problem, including structural optimization, lightweight design of steering wheel, Installation of dynamic vibration absorber, matching of power train mount and reduction of engine idle speed, the effectiveness and rationality of the improvements was verified through experiments.

In order to improve ride comfort and reduce interior noise of commercial vehicles, modal sensitivity analysis and optimization design of a commercial vehicle cab was carried out, which increased the first natural frequency of the optimized cab by 23.96%. The result of cab modal test verified the correctness of the finite element model and the effectiveness of the improving method. The structure-acoustic coupling model of the cab was established, and the acoustic response of the coupled sound field was predicted. The sound pressure level of the optimized cab was reduced. In comparison of the optimized cab with the original one, the optimization scheme was confirmed to be effective and reasonable.