Experimental Validation of a Suspension Rig for Analyzing Road- Induced Noise

As an interest of road-induced noise within a vehicle increases, the operational deflection shape (ODS) analysis has been used to identify a suspension dynamic behavior in the actual operational condition and to establish countermeasures to the problem. In this study, analyzing a suspension road-induced noise performance was conducted in the baseline vehicle and the suspension rig by comparing each ODS. Before the ODS measurement, the major contribution path of structure-borne road noise transmitted through a suspension was verified by using the Transfer Path Analysis (TPA) method. In order to evaluate the effect of the major motion of a suspension on the target point, sensitivity analysis was also performed to the target by using the measured response data of ODS. Furthermore, the comparison of the evaluation in between the baseline vehicle and the suspension rig was verified on the basis of the TPA and sensitivity analysis results. Through the comparison results, the usefulness and validity of using the suspension rig were investigated in analyzing operational dynamic behavior for road-induced noise.