| With the development of economy and the development of society,people are demanding more and more comfortable.Two important indicators affecting the ride comfort are interior vibration and noise.When the powertrain works,the excitation passed through the mounting system is transmitted to the car,which causing interior vibration and noise.In order to research the influence of powertrain mounting system for interior vibration and noise,a vibration and noise test of a certain domestic vehicle was carried out using LMS test equipment.Mounting vibration,interior vibration and noise signal were acquired by layout of vibration acceleration sensor on the powertrain mounting place,seat and steering wheel,layout of noise sensor on seats under idle condition and accelerated conditions.Using spectrum analysis for signal processing,the frequency domain data of vibration and noise signal was obtained,and the vibration of the mount point was analyzed.The vibration isolation ratio was calculated and the effect of the mounting vibration isolation was analyzed.The results show that vibration isolation effect of the left mounting x direction,z direction and the rear mounting y direction is poor.The interior key vibration and noise was analyzed under idle condition.The results show that interior vibration of the steering wheel is more obvious than that of the seat and the front noise is bigger than the rear noise.Using the partial correlation analysis method,the influence of the mounting to interior vibration and noise was analyzed,it is concluded that rear mounting vibration is the main cause of the interior vibration.Using the order analysis method,the influence of the mounting to interior vibration and noise was analyzed under accelerating conditions.It is concluded that seat vibration gets bigger,the seat vibration is mainly caused by the powertrain mounting left and right mount vibration,and interior noise is mainly caused by the rear mounting vibration. |
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