敷设二维周期块状阻尼结构的薄板声辐射数值计算

Numerical Calculation for Sound Radiation of Thin Plate with Two-dimensional Periodically Distributed Bulk-damping

本文借助有限元和边界元的数值算法,针对特定的薄板结构,探讨敷设二维周期块状阻尼结构对薄板声辐射特性的影响。数值计算结果表明,在特定频段内,敷设二维周期块状阻尼结构的薄板辐射声能量要小于敷设传统等面积的整块自由阻尼结构。同时,适当增加阻尼敷设面积及块状阻尼的结构周期数能有效降低薄板声辐射。

Using FEM and BEM, the sound radiation characteristics of a thin plate with two- dimensional periodicallydistributed bulk-damping are studied. Numerical results show that the sound radiation power of this thin plate is less than thatof the plate with the traditional uniformly coated damping in specific frequency bands. Properly increasing damping laying areaand the period number of the bulk damping can effectively reduce the acoustic radiation of the thin plate.