Research On The Analysis And Control Of The Vehicle Cabin Structure-borne Noise

The interior noise level of a vehicle is an important indicator of the evaluationof vehicle performance, the analysis and control of the interior noise has penetratedinto the vehicle development process. A series of studies about test and analysis andcontrol of structure-borne noise of a mining vehicle cabin have been done on thebasis of theoretical analysis of the FE and the BE method.Firstly, structural FE model and acoustic FE and BE models of the miningvehicle cabin have been built, and the structural and acoustic FE modal analysis hasbeen carried out. Also the test of the field sound pressure and the vibrationacceleration of six points on the cabin have been done.Secondly, the load of the cabin has been acquired indirectly by using thesingular value decomposition method. On this basis, the focused frequency wherethe peak sound pressure was has been found by calculating coupled and uncoupledfield point sound pressure and it has been found that the coupled sound pressurewas closer to the test value by contrasting the analysis results to the test result. Thecabin acoustic sensitivity has been considered too large by the acoustic sensitivityanalysis of the cabin. The panels and structural modes which have a largecontribution to the peek sound pressure have been found out by panel contributionanalysis and modal contribution analysis.Finally, the peak sound pressure has been reduced because the stiffness of theroof has been enhanced and the first-order structural mode of the cabin has beenremoved away by topography optimizing the roof which stiffness was poor and hada large contribution to the sound pressure. Then interior sound field frequencyresponse analysis of the cabin which has been optimized has been re-calculated,and then the quadratic optimization has been considered. Two dynamic vibrationabsorbers which quality has been optimized have been installed respectively to theplace where vibrated displacement was the largest on the left and right doors. Thenthe field point sound pressure has ultimately been effective controlled because thevibrations of the left and right doors have been reduced.