汽车车内声场模态分析的无网格法

汽车车内噪声是评价汽车乘坐舒适性的一个重要指标,以某三厢乘用车为研究对象,采用无网格局部径向基点插值法分析了汽车车身车内声模态问题.首先采用径向基函数作为近似式函数,然后采用强式配点法离散控制方程,对于导数边界条件,采用直接法得到等效的一组方程,综合求解所得出的计算结果与有限元方法相比吻合度很好,且无网格方法模拟简单高效,计算精度高,适用较高的频率范围.

The Meshfree Method for the Modal Analysis of Automotive Interior Sound Field

Evaluation of automotive interior noise is an important indicator of comfort.A sedan passenger car is used for the study.The local radial point interpolation meshfree method is used to analyze the sound modal inside the car body in white.First,radial basis function is used as approximate trial function.Then,strong no-grid collocation method is used to discrete control system equation.A set of equivalent equations is obtained by the direct method on the Derivative Boundary.Comparing the results that are derived by Meshfree with that by the finite element,we found that the matches are extremely close,and that the meshfree method is simple,efficient and accuraty.According to the feature of the Meshfree,it can apply to the higher frequency range.