有源结构声传人控制的研究进展

THE DEVELOPMENTS OF ACTIVE STRUCTURAL ACOUSTIC INCIDENCE CONTROL

用有源振动控制板振动,从而对通过板向闭空间传入的声进行控制已有了一些研究,一般是对单频噪声进行前馈控制。但在一些情况下,如对随机振动噪声控制时,前馈控制难应用。在介绍有源结构声传入控制研究进展的基础上,本文用反馈控制方法对无规入射声场通过板向闭空间的传入进行了控制。理论和实验均表明反馈控制方法是有效的。对所研究的板/闭空间耦合系统,在单频情况下调好的反馈控制对其相应的1/30ct内的白噪声亦有控制效果,而在单频情况下调好的前馈控制状态不适用于对宽带噪声控制。

There have been some reseaches on active control of sound transmission through a panel into a cavity by active control of panel vibration. Usually, feedforward control was used to control periodic sound. In some cases such as random incidence, feedforward control is not proper. On the basis of the introduction of developments of active structural acoustic incidence control, feedback control method has been used here to control random incident noise transmission through a panel into a cavity. Both theoretical and experimental studies proved that feedback control method is effective. For the studied panelcavity coupling system, the feedback control method which is effective to pure tone is also effective to broadband random incident noise transmission, while the feedforward control method is only effective to pure tone incident noise transmission.