基于子结构法的车内噪声快速修改预测

Fast Modification Prediction for Car Interior Noise Based on Sub-structuring Method

车内噪声是汽车NVH性能的一个主要内容,快速预测结构修改对车内噪声的影响对汽车设计具有重要意义。基于传统的子结构方法,提出了一种波形基函数子结构方法,其利用选定的基函数来描述不同子结构接合面之间的耦合行为。由于基函数的数目远小于接合面的自由度数目,因此快速预测所用的仿真模型的尺寸将大大缩减,从而可实现快速修改预测。通过某型汽车车内噪声快速修改预测的算例,阐述和验证了这种方法。

Interior noise is mainly concerned for car NVH performance. It＇s important to fast predict the effects of the structure modification for interior noise. A type of wave function based substructuring method is prompted based on the traditional method for solving this problem. It＇s different with the traditional method. The interface displacements in the assembled system are written as linear combination of the wave functions. Due to the number of basisfunctions is much lower than the number of the interface DOFs, the system matrices are also reduced. So, a faster modification prediction can be realized than the traditional method. This method is also applied and verified by an example of vehicle interior noise simulation.