利用附加质量载荷降低薄板声辐射

通过附加质量控制薄板结构声辐射问题。先建立有限元的结构声辐射优化模型,用有限元法和瑞利积分计算薄板结构的声辐射功率。再以不考虑刚度的平板质量单元描述分布质量载荷,以质量单元的厚度为设计变量,研究简谐激励下的薄板结构声辐射优化问题。数值算例表明,优化后的附加质量载荷有效降低了薄板声辐射功率。该方法工艺上教易具有实用工程价值。

Study on Control of the Sound Radiation for Thin Plates with Additive Mass Loading

To control acoustic radiation of the thin plate with the additive mass loading, the optimized finite element model for structural acoustic radiation analysis is built. The structural acoustic radiation power is computed by means of the finite element method and Rayleigh integral. The distributed mass loading is imposed by the plate mass elements with stiffness free. Taking the thicknesses of the mass elements as design parameters, the acoustic radiation optimizing problem of the thin plate under harmonic excitation is studied. Numerical results show that the acoustic radiation power of the plate is effectively reduced by the optimized additive mass loading. This method has an important significance in engineering practice.