基于声辐射模态的振动体积速度测量  

Measurement of volume velocity of vibration structure based on radiation modes

作　　者：吴锦武[1] 王云[1] 

机构地区：[1]南昌航空大学航空与机械工程学院,南昌330063

出　　处：《仪器仪表学报》2008年第2期309-313,共5页Chinese Journal of Scientific Instrument

基　　金：航空科技创新基金(07A56001)项目资助

摘　　要：在低频时,控制振动结构体积速度可以有效控制总声功率。体积速度与第一阶声辐射模态伴随系数近似成正比。通过在振动平板上测量少数点振动速度分布,求解得振动结构第一阶声辐射模态伴随系数近似值,从而获得体积速度,这就形成了一种基于声辐射模态的速度误差传感策略。增加测量点数,并不影响控制器的输入,控制系统实时性能够得到保证,重要的是这种误差传感策略适用任意边界条件的振动结构。以工程常见的四边位移为0的振动板为例,数值计算和实验结果分析表明,利用这种误差传感策略获取体积速度是可行的。Controlling the volume velocity of a plate can reduce efficiently its total sound radiation at low frequency. The shape of the first radiation mode corresponds to the volume velocity of the plate at the low frequency. By measuring the vibration velocity distributions at a few points of the vibrating plate surface, the approximate amplitude values of the first order radiation modes are obtained and then the volume velocity can be derived. Increasing the number of measurement points does not increase the controller inputs and does not affect the operation ability of the controller, and thus this method has good real-time capability. It is important that the sensing strategy is independent of boundary condition of the vibrating plate. With a shown example of the pinned-pinned plate, the analysis and comparison of the numerical calculation result and experimental data show that the proposed new sensing strategy is feasible.

关 键 词：噪声控制 误差传感器策略 声辐射模态 

分 类 号：TB535[理学—物理]