摘要
以简支矩形板为例 ,通过声辐射模态研究结构声辐射问题。从物理和数学意义上对声辐射模态进行了解释 ,并对声辐射模态的自由度进行讨论。由于声辐射模态形状是频率的函数 ,这限制了声辐射模态在噪声控制中的应用。本文提出对声辐射模态算法进行改进 ,使声辐射模态形状在中、低频时与频率无关。最后进行了数值计算研究 ,结果表明 。
With an example of simply supported rectangular panel, this paper presents a new method for analysis of structure borne sound by radiation mode method. First, the physical characteristics and mathematical meaning of the radiation modes are analyzed. Then the degrees of freedom for radiation modes are discussed. It is shown that radiation mode shapes are frequency dependent. This makes the application of the radiation modes very difficult for active noise control. A new technique to improve the radiation mode is developed, by which radiation mode shapes are frequency independent at middle and low frequencies. The numerical results show that this technique is useful.
出处
《振动工程学报》
EI
CSCD
北大核心
2002年第3期262-266,共5页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目 (编号:5 0 0 75 0 36 )
南京大学博士后科研启动基金资助项目
江苏省汽车工程重点实验室开放基金资助 (KJS0 10 88)
关键词
声辐射
噪声控制
声功率
自由度
特征频率
结构振动
noise control
radiation mode
sound power
degree of freedom
fixed frequency
