Application of Dynamic Vibration Absorber in Noise Control of Whole Vehicle

Abstract

As cars become quieter the sound quality of components becomes more critical in the customer perception of car quality. Considering that middle frequency noise plays an important roll for internal noise, the noise signals in the range from200Hz to 500Hz are specially emphasized. Then the acoustic evaluation parameters, such as Sound Pressure Level, Acceleration have been evaluated. Judged from experiences and measuring results, an abnormal noise comes from engine mounts, through the use of dynamic vibration absorber on engine mounts, Vibration on engine mounts and Sound Pressure Level in interior vehicle were greatly improved. At the same time, subjective evaluation also indicated that there was no complaint any more in passenger compartment. Dynamic vibration absorber can properly solve the abnormal noise.

Vibration and sound pressure reduction over a wide frequency range with an optimal dynamic vibration absorber

“…[25][26][27][28] A DVA is a practical device for suppressing vibration and noise at a specific frequency by splitting and shifting the eigenfrequencies of a structure. 29,30 Relevant research has been conducted using DVAs to investigate the vibration and noise control of fuselage 31,32 and distributed absorbers that attenuate passive wide-band frequency vibrations. 33 Despite several contributions of DVAs, numerous limitations still exist; several sound absorbers have been designed to only reduce pressure at a single frequency value.…”