【摘要】 通过在树脂梁上周期贴敷压电片,并连接由被动电阻-电感(RL)谐振分流电路和负电容(NC)电路串联而成的分流电路,构造了压电声子晶体梁结构。采用传递矩阵法计算了该类型压电声子晶体梁结构的带隙特性,并对电阻、电感和负电容对局域共振带隙的影响进行了深入分析,发现分流电路中的LC电磁振荡回路可产生局域共振带隙,而串联的负电容电路则可增强压电片的机电耦合效率,从而增强带隙衰减范围和衰减幅值。采用振动实验方法对理论分析结果进行了验证,证实串联的负电容对局域共振带隙的增强作用,为局域共振声子晶体的设计提供了新的思路。更多还原

【Abstract】 Periodic arrays of piezoelectric patches connected with serial negative capacitive-resistive-inductive( SNCRI)circuits were attached to an epoxy beam so as to construct a piezoelectric phononic beam structure. The band-gap structure of the piezoelectric phononic beam was analysed with the transfer matrix approach. Subsequently,the influences of the resistance,inductance and negative capacitance parameters on local resonance band-gap were discussed. It is found that the LC oscillator circuit can lead to local resonance band-gap,and the negative capacitive circuits can enhance the electromechanical coupling efficiency of piezoelectric patches,i. e. the attenuation in the local resonance band-gap is enlarged thereby. Vibration experiments were conducted to validate the theoretical predictions,and considerable gap enhancements by negative capacitance were observed. The work provides a new way in the design of phononic crystals with tunable band gaps.更多还原