Radiation clusters and the active control of sound transmission through symmetric structures into free space
Radiation clusters and the active control of sound transmission through symmetric structures into free space
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DOI：
10.1016/j.jsv.2007.08.025
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发表时间：
2008-03
影响因子：
4.7
通讯作者：
T. Kaizuka;N. Tanaka
中科院分区：
文献类型：
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作者：
T. Kaizuka;N. Tanaka
本文的目的是利用结构振动传感器的误差信号衰减谐波通过对称结构传播到自由空间。众所周知，对称结构的结构模态函数在辐射声场中聚集成偶函数或奇函数，并且每个簇与另一个簇不耦合。这表明，集群是正交的贡献者，即独立的贡献者，相对于辐射声场。在本文中，这些团簇被称为“辐射团簇”，与辐射模式相反，辐射模式是传统的辐射声功率的正交贡献者。提出了一种基于独立测量和控制单个辐射簇的对称结构向自由空间传播谐波的主动控制方法，称为“辐射簇控制”。该方法属于中等权限控制（MAC），介于低权限控制（LAC）：结构模态控制和高权限控制（HAC）：辐射模态控制之间，具有类似LAC的实用性优点，同时具有类似HAC的高控制性能和控制增益分配的灵活性。给出了在无限隔板中简支矩形板的辐射簇控制的具体实例。
The purpose of this paper is attenuating harmonic sound transmission through symmetric structures into free space using error signals derived from structural vibration sensors. It is well known that structural modal functions of symmetric structures are clustered to an even function or an odd function and each of the clusters uncouples with the other cluster in the radiated acoustic field. This indicates that the clusters are orthogonal contributors, i.e., independent contributors, with respect to the radiated acoustic field. In this paper, the clusters are referred to as “radiation clusters” in contrast with radiation modes, which are conventional orthogonal contributors with respect to the radiated acoustic power. The active control of harmonic sound transmission through symmetric structures into free space based upon independently measuring and controlling the individual radiation clusters, termed “radiation cluster control”, is proposed. The approach falls into a category of middle authority control (MAC), which is between low authority control (LAC): structural modal control and high authority control (HAC): radiation modal control, possessing the benefit of practicality similar to LAC, while providing high control performance and some flexibility of control gain assignment similar to HAC. Specific examples relating to radiation cluster control of a simply supported rectangular plate in an infinite baffle are given.