大型客车车身的阻尼减振降噪技术研究

本文基于边界元法对车室进行声场分析和车身板块贡献度分析，进而找出车内噪声声压峰值处所对应的振动频率及该峰值下的“噪声源”板块，围绕车身减振降噪这一目标和车身设计轻量化的要求，基于响应面法建立阻尼复合结构的声辐射特性、模态频率和损耗因子与结构参数关系的数值模型，并对相应约束条件下的最佳阻尼复合结构参数匹配进行优化设计，综合研究内容对车身结构阻尼处理后取得了较好减振降噪效果。

Vibration and noise damping technique for large bus body

Boundary element method for sound field of car room and the contribution of body segments are used in this paper, then find out the car noise sound pressure peak corresponds to the vibration frequency of the premises and the peak under the noise sources section. To get the goal of bus body vibration-noise reductive and lightweight body design, damping composite structure parameters under corresponding constraints are solved base on sound radiation, modal frequencies and loss factors characteristics of damping composite structures model. It has achieved good results after damping vibration and noise reduction on the bus body.