轴向载荷周期结构梁的弯曲振动带隙特性

Flexural vibration band gaps in axially loaded periodic beam structure

各种载荷广泛存在于结构振动中,影响结构的振动特性。利用传递矩阵法,建立了轴向载荷周期结构梁弯曲振动特性理论模型,能够计算轴向载荷周期结构梁弯曲振动的能带结构和传输特性。研究表明,轴向载荷周期结构梁弯曲振动存在带隙,并分析了轴向载荷对带隙频率范围和衰减的影响。通过调节载荷条件,可以实现了超低频带隙特性。通过调节轴向载荷的大小和方向可以提高带隙的适应性。

Axial loads applied on structure influence the structural vibration properties.Using the transfer matrix method,the flexural vibration band gaps in axially loaded periodic composite beam were studied.The energy band structure and transmission coefficient were calculated.The results show that the flexural vibration band gaps do exist in the axially loaded periodic beam structure.The load can influence the gap frequency ranges and the vibration attenuation.The existence of the extra low frequency band gap can also be found under appropriate load.By tuning the amplitude and direction of the axial load,the adaptability of the band gap can be improved