轮胎振动辐射声场有限元法与边界元法研究

Study on the vibration and sound field radiated by a tire utilizing finite element method and boundary lernent method

为了探索轮胎振动辐射声场特征,基于实测得到的轮胎几何参数和材料参数,建立了P215/70R14型轮胎的有限元模型.将模态分析结果导入边界元软件,求解了轮胎在径向力激励下的辐射效率、辐射声功率、表面方均根振动速度、激励点法向声强及轮胎声场指向性.结果表明,在yOz平面(x轴为轮胎的对称轴)频率为61 Hz处,轮胎声辐射接近偶极子的辐射声场.在频率为451 Hz处,轮胎声辐射接近四极子的辐射声场.当频率高于451 Hz并继续升高时,声场指向性趋于复杂.该结果为进一步探讨轮胎在真实激励条件下辐射噪声的计算奠定了基础.

In order to investigate the characteristics of the sound field radiated by a vibrating tire,a finite element method(FEM) model of a tire with type P215/70R14 is built on the basis of geometrical and material parameters measured by others.After the modal analysis results is put into BEM code,the radiation efficiency,radiation power,square mean root vibration velocity on surface,normal sound intensity at driving point and sound directivity pattern are computed.The results show that the sound fields on the yOz...