An Analysis of Road Impact Booming on a FR Vehicle using Transfer Path Analysis and Experimental Test Models

When a vehicle passes rough road and bump at low speed, impact booming below 100Hz usually happens. Especially a FR(Front engine-Rear drive) large sedan shows large impact booming noise due to large body and chassis parts(cross- member, shock-absorber). The study tried to figure out the contribution of input force at chassis points and body dynamic characteristics by TPA(transfer path analysis) for low frequency booming noise. Through the TPA model, the sensitivity of impact booming by chassis force change was done and body characteristics which affects ATF(Acoustic Transfer Function) were investigated. The ASQ(Airborne Sound Quantification) model which consists of body frames and panels was made and we predicted impact booming by change of body using the model in order to improve booming problem. Finally, the contribution of each chassis and body part was defined through the sensitivity of each part and comparisons between ours and competitor car.