Abstract:

Truck cab structures usually consist of plates, shells and beams. The traditional methods of structural modification of cabs to reduce the noise include adding mass and damping materials to the cabs and changing panel thickness of the cabs etc. These methods are somewhat blind when the optimal improvement positions are not yet known. In this paper, the MATV technique is used to determine the dominant panels, which have large contribution to the noise level, on the side of drivers right ear. Then, the BEM acoustic sensitivity analysis is utilized to search the positions of the structure which have the dominant influence on the specific sound pressure level. Using this method, the structure can be well improved for noise control.

Key words: acoustics, MATV, BEM method, acoustic sensitivity, noise control

摘要：

卡车驾驶室大多属于板梁组合的结构。传统结构修改主要采用在驾驶室相应位置增加质量、附加阻尼材料、改变面板厚度等方法。在最优改进部位未知的情况下，这些方法具有一定的盲目性。本文运用MATV技术确定驾驶员右耳处声压贡献突出的主要板件,利用边界元声学灵敏度分析确定结构中对特定声压级有主要影响的部位，从而可以对结构进行针对性修改，以达到降噪的目的。

关键词: 声学, 模态声传递向量, 边界元法, 声学灵敏度, 噪声控制