不同脱层位置下脱层屈曲梁振动实验研究

通过实验对一端固定一端夹支脱层屈曲梁在轴向周期激励作用下的非线性动力响应进行了实验研究.利用位移时间历程图,相图和频谱图,对多组不同脱层位置下脱层屈曲梁的非线性动力响应进行了分析.实验表明脱层梁结构存在倍周期以及混沌运动等非线性动力学行为.同时实验还表明,在相同的脱层长度下,脱层位置对脱层梁的动力学特性有明显影响,即脱层区域中心越靠近梁结构的中心位置,脱层梁的一阶自然频率越低,且越容易在较低的激励频率和激励荷载下发生周期分叉和混沌等行为.

Experimental study on the vibration of delaminated buckled beams with different delamination locations

The nonlinear response of delaminated buckling beams with different delamination locations under axial periodic excitation was examined through experimental investigation. The time history of displacement, phase diagrams and spectrum are described and discussed. The research demonstrates the delaminated buckled beam performs nonlinear dynamic motions, such as period, period doubling as well as chaos. The experimental results show that in the case of the same delamination length, the delaminated location greatly affect the dynamic characteristics of delaminated buckled beam. And when the central of the delamination region is closer the mid span of beam, the first order frequency of delaminated beam is lower. Moreover, the delaminated buckled beam more easily experiences the periodic motion, doubling periodic motion and chaotic motion at lower excited frequency and loads.