An experimentally validated piezoelectric nonlinear energy sink for wideband vibration attenuation
An experimentally validated piezoelectric nonlinear energy sink for wideband vibration attenuation
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DOI：
10.1016/j.jsv.2018.08.038
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发表时间：
2018-12
影响因子：
4.7
通讯作者：
T. Silva;M. A. Clementino;C. D. Marqui;A. Erturk
中科院分区：
文献类型：
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作者：
T. Silva;M. A. Clementino;C. D. Marqui;A. Erturk
各种研究人员已经研究了耦合到具有基本刚度非线性的非线性机械附件的线性机械振荡器的行为。在一定条件下，本质上非线性的附件充当非线性能量汇（内斯），并且可以实现从主结构到非线性附件的单向能量传递。本质上非线性附件的重要特性是它不干扰任何优先谐振频率，导致增加的抗失谐鲁棒性，从而实现频率方面的宽带性能。本文提出了一种实验验证的基于压电的内斯宽带振动衰减。电路由负电容分流器（引入用于消除压电电容）与使用运算放大器实现的三次非线性电容串联组合而成。详细讨论了内斯分流电路的设计和实际实现。压电内斯的性能衰减在很宽的频率范围内的振动进行了数值模拟和实验验证的悬臂在没有和存在的尖端质量附件。
Various researchers have investigated the behavior of a linear mechanical oscillator coupled to a nonlinear mechanical attachment that has essential stiffness nonlinearity. Under certain conditions, the essentially nonlinear attachment acts as a nonlinear energy sink (NES) and one-way energy transfer from the main structure to the nonlinear attachment can be achieved. An important characteristic of an essentially nonlinear attachment is that it does not posses any preferential resonance frequency, resulting in increased robustness against detuning, thereby enabling frequency-wise wideband performance. This work presents an experimentally validated piezoelectric-based NES for wideband vibration attenuation. The electrical circuit consists of a negative capacitance shunt (introduced for cancelling the piezoelectric capacitance) combined in series with a nonlinear capacitance of cubic order that is realized using operational amplifiers. Design and practical implementation of the NES shunt circuit are discussed in detail. The performance of the piezoelectric NES to attenuate vibrations over a wide range of frequencies is numerically simulated and experimentally validated for a cantilever in the absence and presence of tip mass attachments.