摘要
在有限元模态分析的基础上,提取了含人工横向以及十字形穿透裂纹的悬臂方薄板各单元的相关参数,并将瑞利积分离散化,进而计算了裂纹悬臂方薄板辐射声场的空间分布.结果表明,穿透裂纹的出现不仅使悬臂板的模态频率有明显的变化(辐射声场频谱变化),而且使声场在空间分布有显著的变化.该方法的有效性通过基于瑞利-里兹方法得到的完整悬臂板辐射声场来验证.该方法可用于求解任意形状穿透裂纹薄板辐射声场的计算.
Based upon the modal analysis by FEM, some relative parameters of every element on a cantilever thin square plate with an artificial through crack parallel to the clamped edge or of a crossshaped are extracted. After the Rayleighs integral is discreted, the pressure spatial distribution of the sound field radiated by the cracked plate is computed. It is shown that the through crack doesnt only make the frequencies of modes quite different from the intact plate (therefore different spectra of the sound field), but also changes the distribution of the sound field obviously. The validation of the method is illustrated by the sound field radiated by the intact cantilever square plate based on RayleighRitz method, and it is suitable for computing sound field radiated by a thin plate with a different kind of through crack.
出处
《纺织高校基础科学学报》
CAS
2003年第3期223-229,共7页
Basic Sciences Journal of Textile Universities
基金
长安大学科技发展基金资助项目(02Q20)
关键词
有限元
人工穿透裂纹
悬臂方板
辐射声场
finite element method (FEM)
artificial through crack
cantilever square plate
radiated sound field
