自适应声学结构声压误差传感策略

在自适应声学结构的实现中，误差传感策略是关键的一环，现有研究表明：利用结构表面声压构造目标函数是可行的方法，但实际中只能测量近场声压，由此将带来一系列差异，文中研究这种差异的大小及克服的办法。结果表明：在与次级结构表面平行、面积相等的测量面上，如果测量面距振动结构的距离远小于声波波长，则测量面上离散点的声压平方和作为有源控制的目标函数即可取得良好的降噪效果。

Error Sensing Strategies for Adaptive Acoustic Structures

Adaptive acoustic structure (AAS) is a special example of a smart structure applied to noise control, which make it possible to employ active structural acoustic control as a practical control technique because of its easy-to-installation and versatile. Error sensing strategy is a key step in implementing an AAS. However, in practice only nearfield pressure sensing can be obtained, which results in degradation of noise reduction. In this paper, based on nearfield pressure error sensing strategies for AAS are investigated theoretically. It is concluded that if the measuring plane, which has the same area with and parallel to the vibrating structure surface, is much less than the acoustic wavelength, considerable noise reduction can be obtained using squared pressures on the measuring plane as the cost function for AAS.