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Comparison of low frequency piezoceramic shunt techniques for structural damping

机译:低频压电陶瓷分流技术对结构阻尼的比较

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In this paper, the performances of two novel low frequency piezoceramic shunt techniques for structural damping are compared to the traditional passive tuned resonant shunt circuit technique. The first novel technique, state switching, is a semi-active variable stiffness technique in which bonded piezoceramic actuators are switched from the short circuit to open circuit states. This technique changes the stiffness of the structure for two quarters of its vibration period, thus dissipating energy. The second novel technique, synchronized switching, is a semi-active continuous switching technique in which a resistor/inductor shunt circuit is periodically connected to the bonded piezoceramic actuators. This technique applies charges to the piezoceramic actuators in a manner similar to the Direct Velocity Feedback and Bang-Bang time optimal control techniques. A brief description of each of the damping techniques is given. Numerical simulations of the switching techniques are shown and compared to the resonant shunt damping technique. Finally, preliminary experimental results are presented for the resonant shunt, and synchronized switching techniques on a simply supported beam.
机译:本文将两种新型低频压电类分流技术的性能与结构阻尼进行了比较,与传统的被动调谐谐振分流电路技术进行了比较。第一新颖的技术,状态切换是一种半主动可变刚度技术,其中粘合压电杂种致动器从短路切换到打开电路状态。该技术改变了结构的刚度,使其振动周期的两个季度,从而耗散能量。第二新颖技术同步开关是一种半主动连续开关技术,其中电阻/电感器分流电路周期性地连接到粘合的压电陶瓷致动器。该技术以类似于直接速度反馈和BANG-BANG时间最佳控制技术的方式对压电陶瓷致动器施加电荷。给出了每个阻尼技术的简要描述。与谐振分流阻尼技术相比,示出了切换技术的数值模拟。最后,初步实验结果用于谐振分流器,并在简单地支撑梁上的同步切换技术。

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