基于统计能量模型的辐射声功率灵敏度分析

应用统计能量分析原理,推导了基于统计能量模型的子系统模态能量灵敏度表达式,建立了面板结构辐射声功率与设计参数之间的关系,并运用该参数灵敏度方法分析了结构内部损耗因子和耦合损耗因子对子系统响应的影响,揭示了内部损耗因子对辐射噪声的影响规律。结果表明适当提高源子系统的内部损耗因子,可以降低系统的辐射噪声。研究发现子系统的最佳内部损耗因子在0.5%～2%之间,为低噪声设计提供了研究思路。

Radiated Sound Power Sensitivity Analysis Based on Statistical Energy Analysis Model

By applying the Statistical Energy Analysis （SEA） model, the radiated sound power sensitivity expression of panel was derived, the relationship between design parameters and panel radiated noise power level were established, and the effects of structural internal loss factor and coupling loss factor on radiated noise of panel were analyzed. The results show that proper increase of the internal loss factor of the source subsystem can reduce the radiated noise of the source subsystem itself. This paper finds out that the optimization of damping selection is between 0.5% and 2% and thus provides a research approach for low noise design.