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不同压电分流电路对声子晶体梁带隙的影响
Influences of different types of piezoelectric shunting circuits on band gaps of phononic beam
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摘要: 通过在匀质基体梁上周期性对贴连有分流电路的压电片,可以形成一维声子晶体结构.不同分流电路将决定梁的带隙特性.电阻分流电路能够对梁的模态共振有一定的抑制作用,而且可以通过改变压电效应的强弱使Bragg带隙结构发生变化.LC分流电路会使梁产生局域共振带隙,其带隙是由压电片激励LC电路产生电磁振荡形成.引入电阻后会使LC电路的共振作用变弱,使得带隙衰减幅值变小,但可以扩宽带隙频率范围.Abstract: Piezoelectric patches connected with shunting circuits are periodically placed along a base beam, forming a one-dimensional phononic crystal. Different types of shunting circuits will determine the band structure of the beam. Resistive shunting circuits can restrain the beam' s modal vibrations to some extent and the band gaps of the beam can be changed by weakening the piezoelectric effect. LC shunting circuits can produce locally resonant gaps induced by LC circuits' electromagnetic oscillations excited by piezoelectric patches. When resistors are added to the LC circuits, the LC circuits' oscillation will be weakened and the attenuation amplitude in the band gaps will be lowered, but the scope of band gaps are widened.
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