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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >MODELING OF PIEZO STACK ACTUATORS AND THEIR APPLICATION IN ACTIVE VIBRATION CONTROL
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MODELING OF PIEZO STACK ACTUATORS AND THEIR APPLICATION IN ACTIVE VIBRATION CONTROL

机译：压电叠片执行器的建模及其在主动振动控制中的应用

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This paper presents the vibration control of a highly simplified two degree of freedom model of a helicopter. The vibration control study has been performed using both active and passive vibration control schemes. In the case of active vibration control, the feedback mechanism affects the stiffness of the system; whereas in passive vibration control, the absorber mass affects the inertia of the system. The active control is achieved using a combination of piezo stack sensor and actuator mechanism. A finite element model for the piezo stack mechanism has been developed to obtain a relation between deformation, applied/induced potential and externally applied mechanical load. The results of this study indicate that inclusion of sensor and actuator units increases the natural frequency of the system due to increase in stiffness of the system. It is observed that in the case of active vibration control, the frequency response of acceleration of the system is highly sensitive to small variations in the magnitude of gain around its optimum value and insensitive to changes in excitation frequency; whereas in passive vibration control, the frequency response does not exhibit any significant change in the characteristics with respect to thevariation in the absorber mass, while it is highly sensitive to changes in operating frequency.
机译：本文提出了一种高度简化的直升机两自由度模型的振动控制。已经使用主动和被动振动控制方案进行了振动控制研究。在主动振动控制的情况下，反馈机制会影响系统的刚度。而在被动振动控制中，吸收器质量会影响系统的惯性。主动控制是结合使用压电堆栈传感器和执行器机构来实现的。已经开发了用于压电叠层机构的有限元模型，以获取变形，施加/感应电势和外部施加的机械载荷之间的关系。这项研究的结果表明，由于增加了系统的刚度，因此包含传感器和执行器单元会增加系统的固有频率。可以看出，在主动振动控制的情况下，系统加速度的频率响应对增益大小在其最佳值附近的微小变化高度敏感，并且对激励频率的变化不敏感。然而，在被动振动控制中，频率响应在吸收体质量变化方面没有表现出任何明显的变化，而对工作频率的变化非常敏感。

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