弹性板/矩形腔耦合声场的响度分析  

Loudness analysis for coupled sound field of a flexible plate/rectangular cavity system

作　　者：贺岩松[1,2] 沈旺[1] 徐中明[1,2] 李耀光[1] 李传兵 

机构地区：[1]重庆大学机械工程学院,重庆400030 [2]汽车噪声振动和安全国家重点实验室,重庆400039

出　　处：《振动与冲击》2012年第19期104-108,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(50975296);汽车噪声振动和安全技术国家重点实验室2010年度开放基金(NVHSKL-201010)

摘　　要：利用有限元结合间接边界元的方法分析弹性板/矩形腔耦合系统的内声场,通过与实验对比,验证了这种结构-声耦合法在预估板-空腔耦合系统声振特性的可行性。运用ISO532B响度计算标准的算法,分析封闭腔内不同位置测点处的特征响度变化规律,讨论参与耦合的弹性板厚度及边界条件对闭腔内声响度的影响。最后,以响度作为声品质的评价指标,通过参数化滤波的方法对闭腔内不同位置的测点的各特征频带进行处理,找出对人耳主观感觉影响较大的频率范围,从而为进行闭腔噪声控制和声品质改善提供参考。Vibration and noise tests of an aluminum plate/rectangular cavity coupling system were designed to validate an integrated FEM/IBEM was satisfactory to vibro-acoustic analysis of a flexible plate/enclosure coupling system. The law of special loudness for points at variant locations in the enclosed cavity was studied based on the algorithm of ISO532B loudness calculation standard. The effects of thickness and boundary condition of the plate on the special loudness of the enclosure were also investigated. Finally, taking the loudness as an evaluation index of sound quality, the critical frequency bands of 3 different points in the enclosure affecting human ear＇s subjective sensation were processed with the parametric filtering method, so as to provide a reference for noise control and sound quality improvement of an enclosure cavity structure.

关 键 词：结构-声耦合法 弹性板/矩形腔 特征响度 边界条件 参数化滤波 

分 类 号：TB53[理学—物理]