复杂形状封闭空间结构噪声的有源控制数值研究
首发时间:2012-01-18
摘要:弹性结构向封闭空间声辐射的有源控制问题具有重要的工程应用背景。然而,传统的针对三维封闭空间结构声辐射及其有源控制的理论研究中,研究和分析对象多是针对规则的矩形封闭空间,不符合实际舱室空间情况。本文综合运用有限元方法和结构-声耦合理论,建立了复杂形状封闭空间结构声辐射有源消声系统数值模型,以封闭空间的声势能作为有源控制的目标函数进行了有源消声的数值仿真分析研究,并对此控制目标下的控制效果进行了分析。利用这一模型可以对任意复杂形状封闭空间进行有源消声的数值分析,而不受封闭空间形状和结构形状及其边界条件的限制,从而托宽了有源消声技术的研究范围,为复杂舱室空间有源消声的实施奠定了理论基础。
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Numerical Simulation of Active Noise Control within an Irregular Cavity
Abstract:Active noise control in a vibro-acoustic system composed of flexible plates and cavity has been extensively studied. However, most of existing study is restricted to the regular cavity. In engineering application, a vibro-acoustic system with irregular cavity is more ubiquitous as easily observe. This paper deals with the active noise control in an irregular cavity. A numerical model for active noise control in an irregular cavity is modeled. On the basis of the active cotnrol system, active noise control by structural control force is implemented numerically. Total acoustic potential energy inside the cavity is chosed as the control cost function in order to globally control the sound field , active control efects in terms of both the structural kinetic energy and acoustic potential energy are examined.
Keywords: noise control irregular cavity active control structural-acosutic coupling
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