Research and Application of Reinforcement Beams Supporting Body Panel on Attenuation of Low Frequency Vibration and Sound Radiation

Due to the tendency of vehicle lightweight, the body panel becomes thinner. So the panel is much easily excited by engine and road excitations and radiates noise into the passenger compartment, which is frequently complained by the customers. The paper studies the combined structures including a body panel and different reinforcement beams and analyzes the characteristics of the panel vibration and sound radiation. The theoretical analysis and numerical calculation show that the combined structures are benefit to increase the panel’s stiffness and reduce its surface velocity, and further attenuate the panel’s sound radiation power and sound radiation efficiency. The paper analyzes the mechanism of generating the interior booming and provides the control method by tuning the structures of the reinforcement beams and the supporting ways to the panel. The analysis results are consistent with the testing ones, and the vehicle booming is attenuated. The control method is practicable, which provides help for vehicle body development.