车身乘坐室声振耦合的动态子结构修改方法

在声振耦合有限元分析的基础上 ,提出了一种以车内降噪为目的的车身结构动态修改的新方法。该方法将对车身乘坐室壁结构的局部修改等效地视为在其上附加一子结构 ,并给出了车内声压变化与车身壁结构修改间的直接定量关系。最后 ,以SH76 0A型轿车乘坐室为对象给出了算例 ,并将计算结果与测量结果加以对比 ,二者十分接近 ,从而验证了所提方法的正确性。

A new dynamic substructure modification method for structure-acoustic coupling analysis of an automobiles passenger compartment

A new dynamic modification method for noise depressing in an automobile body is put forward based on the finite element analysis on the structure acoustic coupling of the passenger compartment,which regards the local modification of the body wallboard as appending an equivalent substructure on it,and givens an explicit formula about the quantitative relationship between the variety of the interior sound pressure and the modification of the automobile body structure.In order to validate the correctness of the method given here,an example for the passenger compartment of saloon car type SH760A is solved.The calculated result compares well with that obtained experimentally.