In wind tunnel tests, the cantilever sting is usually used to support aircraft models because of its simple structure and low aerodynamic interference. However, in some special conditions, big-amplitude and low-frequency vibration would occur easily on the model not only in the pitch direction but also in the yaw direction, resulting in inaccurate data and even damage of the supporting structure. In this paper, aiming at suppressing the vibration in pitch and yaw plane, a multidimensional system identification and active vibration control system on the basis of piezoelectric actuators is established. A vibration monitoring method based on the strain-displacement transformation (SDT) matrix is proposed, which can transform strain signals into vibration displacements. The system identification based on chirp-Z transform (CZT) is applied to improve the adaptability and precision of the building process for the system model. After that, the hardware platform as well as the software control system based on the classical proportional-derivative (PD) algorithm is built. A series of experiments are carried out, and the results show the exactness of the vibration monitoring method. The system identification process is completed, and the controller is designed. Vibration control experiments verify the effectiveness of the controller, and the results indicate that vibrations in pitch and yaw directions are attenuated apparently. The spectrum power is reduced over 14.8 dB/Hz, which prove that the multidimensional identification and active vibration control system has the capability to decline vibration from different directions.

中文翻译：

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风洞中基于压电的动力系统的多维系统辨识与主动振动控制

在风洞测试中，悬臂式simple架由于其结构简单且空气动力学干扰小而通常用于支撑飞机模型。但是，在某些特殊条件下，不仅在俯仰方向上而且在偏航方向上都容易在模型上发生大振幅和低频振动，从而导致数据不准确，甚至损坏了支撑结构。为了抑制俯仰和偏航平面的振动，建立了基于压电致动器的多维系统辨识和主动振动控制系统。提出了一种基于应变位移变换矩阵的振动监测方法，可以将应变信号转换为振动位移。应用基于线性调频Z变换（CZT）的系统辨识，提高了系统模型构建过程的适应性和准确性。在此基础上，建立了基于经典比例微分算法的硬件平台和软件控制系统。进行了一系列实验，结果表明了该振动监测方法的正确性。系统识别过程完成，并设计了控制器。振动控制实验验证了控制器的有效性，结果表明，俯仰和偏航方向的振动明显减弱。频谱功率降低超过14.8 dB / Hz，