基于加筋板振动力学理论的车身阻尼材料设计

Design of Body Damping Material Based on Vibration Mechanics Theory of Stiffened Plate

首先根据加筋板振动力学理论,以及基板应变能分布特点,研究了车身壁板阻尼材料设计方法。接着,采用声固耦合仿真技术,获知某车型顶盖振动对车内低频噪声性能影响明显。然后,运用车身壁板阻尼材料设计方法设计了顶盖阻尼材料空间布局。最后,通过车内仿真分析计算结果表明,该方法可使车内低频噪声峰值下降10dBA以上,车内噪声问题得到有效改善。上述研究采用理论分析与实际运用相结合的方法,为车身钣金件阻尼材料设计和NVH性能优化提供了理论参考和方案借鉴。

Firstly,according to the vibration mechanics theory of stiffened plates and the distribution characteristics of strain energy of the bottom plate,proposed the design method of damping material for body panels. Secondly,using the acoustic-solid coupling simulation technology,it is known that the vibration of the roof has a significant impact on the low-frequency noise performance of the vehicle. Then,the spatial layout of the roof damping material is designed by using the body panel damping material design method. Finally,the calculation results of simulation analysis show that this method can reduce the peak value of low-frequency noise in the car by more than 10dBA,and the problem of interior noise is effectively improved. The above research uses the combination of theoretical analysis and practical application,and can provide theoretical reference and program reference for the design of body damping material and NVH performance optimization.