Sensitivity Test of the Influence of the Performance Parameters of the Main Suspension Components of a Certain MPV on the Interior Noise of the Vehicle

Abstract

In the process of a domestic MPV development, it is found that there is a large noise in the vehicle at a constant speed. Through TPA analysis, it is found that road excitation is primary, and the frequency is distributed between 75-400Hz. In response to solve the question, the influence sensitivity of the performance parameters of the suspension system on the interior noise of the vehicle is studied after the modal of the chassis structure is analyzed, such as leaf spring stiffness, shock absorber damping force, tire pressure. Test results found that in the low-speed rough road several factors affect the sensitivity of driver’s right ear, from large to small in order that is tire pressure, leaf spring stiffness, front damper damping force, rear shock absorber damping force. Ultimately through the combination of these parameters the noise of the driver’s right ear was reduced further and reached the target value. The results of this study have some reference value for similar NVH problem to other vehicles.