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首页> 外文期刊>The Journal of the Acoustical Society of America >New modeling method and mechanism analyses for active control of interior noise in an irregular encloure using piezoelectric actuators
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New modeling method and mechanism analyses for active control of interior noise in an irregular encloure using piezoelectric actuators

机译：利用压电致动器主动控制不规则外壳内的内部噪声的新建模方法和机理分析

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摘要

A new modeling method is developed in this paper for the active minimization of noise within a three-dimensional irregular enclosure using distributed lead zirconate titanate piezoelectric (PZT) actuators, and the control mechanisms for irregular enclosure are analyze. The irregular enclosure is modeled with four rigid walls and two simply supported flexible panels, and PZT actuators are bound to one of the flexible panels. The process of the new modeling method is as follows. First, the modal coupling method is used to establish the motion equations, which contain important coefficients such as modal masses and modal coupling coefficients, etc., of acoustic-structural-piezoelectric coupling system. Then, the acoustic modes and the modal masses of irregular enclosure are calculated by numerical methods. Last, the modal coupling coefficients in motion equations are calculated according to the numerical results of the acoustic modes of irregular enclosure and the modes of two panels. The validity of this modeling method is verified by a regular hexahedron enclosure. Two cost functions are applied to this model. With the two cost functions, good results are obtained in minimizing the sound-pressure level (SPL) within irregular enclosure according to numerical investigations. By comparing the results obtained under controlled and uncontrolled states, the control mechanisms of the system are discussed. It is found that the control mechanisms vary with disturbance frequencies. At most disturbance frequencies, the SPL within enclosure is reduced by restructuring the modes of two panels simultaneously. When the disturbance frequency comes close to one of the natural frequencies of panel a, the dominant mode of panel a is suppressed, while the modes of panel b are reconstructed. While the disturbance frequency is near one of the natural frequencies of panel b, the modes of two panels are restructured at the same time.
机译：本文提出了一种新的建模方法，该方法使用分布式锆钛酸铅压电压电致动器主动地最小化三维不规则外壳内的噪声，并分析了不规则外壳的控制机制。不规则的外壳具有四个刚性壁和两个简单​​支撑的柔性面板的模型，PZT执行器绑定到其中一个柔性面板。新的建模方法的过程如下。首先，使用模态耦合方法建立运动方程，该方程包含声-结构-压电耦合系统的重要系数，例如模态质量和模态耦合系数等。然后，通过数值方法计算出不规则包络的声模和模态质量。最后，根据不规则封闭声模式和两个面板模式的数值结果，计算了运动方程中的模态耦合系数。通过常规六面体外壳验证了此建模方法的有效性。此模型应用了两个成本函数。通过两个成本函数，根据数值研究，在最小化不规则外壳内的声压级（SPL）方面可获得良好的结果。通过比较在受控状态和非受控状态下获得的结果，讨论了系统的控制机制。发现控制机制随干扰频率而变化。在大多数干扰频率下，通过同时重组两个面板的模式来降低机柜内的SPL。当干扰频率接近面板a的固有频率之一时，面板a的主导模式被抑制，而面板b的模式被重构。当干扰频率接近面板b的固有频率之一时，两个面板的模式会同时重构。

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