为有效解决轨道交通振动对环境的影响,提出一种准零刚度局域共振超材料(quasi zero stiffness-locally resonant metamaterial,简称QZS-LRM)隔振结构,结构由钢及热塑性聚氨酯橡胶组成。采用有限元软件,通过施加预压的方法使结构在水平与竖直方向呈现出准零刚度特性,分析带隙产生的机制,探讨预压量对带隙的影响,结合透射谱证明带隙范围的准确性。展开结构水平和竖直布置的隔振性能对比,基于实测高铁振动数据,验证QZS-LRM的隔振效果。研究结果表明:预压量越大,带隙起始频率越低,带宽增加;透射谱验证了带隙范围,水平布置的隔振效果明显优于竖直布置。基于沪昆高铁实测加速度数据,开展频域与时域分析,两种情况最大加速度幅值衰减均超过90%,证实了QZS-LRM具有良好的隔振性能。
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