驾驶室结构噪声优化设计

Optimization design of cab structure noise

文章以某卡车驾驶室为研究对象,分别建立了驾驶室结构、声学以及声固耦合有限元模型,并对模型准确性进行了试验验证;基于建立的声固耦合有限元模型,进行了驾驶室内部场点声压响应计算和峰值频率点面板声学贡献量以及结构模态参与因子的计算;基于计算结果以及模态应变能的叠加来确定需要优化的面板和车身板件进行阻尼处理的位置。通过阻尼优化,驾驶室内150Hz峰值声压降低了5.31dB。

Taking a truck cab as the research object,the finite element models of the cab structure,acoustics and acoustic-structure coupling are established,and the accuracy of the models is verified by experiments.Based on the acoustic-structure coupling finite element model,the acoustic pressure response of the cab internal point is calculated.The acoustic contribution of the panel and the structural modal participation factors for the peak frequency points are calculated.Based on the above calculation results and the superposition of the modal strain energy,the panel that needs to be optimized and the location of damping treatment for body parts are determined.By the damping optimization,the indoor 150 Hz peak pressure is reduced by about 5.31 dB.