摘要
为有效抑制工程实践中低频振动,在分析其能带结构及带隙形成机制的基础上,采用有限元方法研究组合周期十字减振沟带隙特性的影响因素,并结合模型试验分析其减振性能。结果表明:组合周期十字减振沟带隙特性主要受周期常数、减振沟深度、土体弹性模量和充填介质等因素影响;随着周期常数的增大,组合周期十字减振沟更易获得低频带隙,但是带宽变窄,而通过增大十字减振沟深度获得较大带宽的低频带隙,且带隙数量增多;随着弹性模量的增加,带隙的边界频率同步向高频迁移,通过填充介质获得更为低频且带隙较宽的带隙。试验结果显示,带隙范围内的加速度最大衰减幅度达到0.00124 m/s^(2),带隙频段内的平均振幅衰减系数为0.2062,且最大衰减程度达到98.45%,组合周期十字减振沟具有显著的减振性能。
In order to effectively control low-frequency vibrations in engineering practice,the structure and the formation mechanism of the band gap were analyzed,and the finite element method was employed to investigate the influencing factor of the band gap in combined periodic cross-isolation trenches.Subsequently,this study analyzed vibration isolation performance using the model experiment.The results show that the band gap characteristics of the combined periodic cross-isolation trenches are mainly influenced by the periodic constant,the depth of the channel,the elastic modulus of soil and the filling medium.With the increase of the period constant,combined periodic cross-isolation trenches are more likely to obtain the low-frequency band gaps,but the bandwidth narrows.By increasing the depth,the low-frequency band gap with a larger bandwidth can be obtained,and the number of band gaps increases.With the increase of elastic modulus,the boundary frequency of the band gap migrates to high frequency synchronously,and a more low-frequency and wider band gap can be obtained by filling the medium.The experimental results show that the maximum attenuation amplitude of acceleration in the band gap range reaches 0.00124 m/s^(2),the average amplitude attenuation ratio in the band gap is 0.2062,and the maximum attenuation degree reaches 98.4%.The combined periodic cross-isolation trenches have remarkable vibration isolation performance.
作者
王海洋
翟春鑫
王珠
冯晋昊
张小毛
WANG Haiyang;ZHAI Chunxin;WANG Zhu;FENG Jinhao;ZHANG Xiaomao(National&Local Joint Engineering Laboratory of Traffic Civil Engineering Materials,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Railway 18 th Bureau Group Co.,Ltd.,Tianjin 300222,China)
出处
《中国安全科学学报》
北大核心
2025年第2期118-126,共9页
China Safety Science Journal
基金
重庆市自然科学基金资助(CSTB2023NSCQ-MSX0180)
重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金资助(LHSYS-2021-006)
安徽省建筑声环境重点实验室开放基金资助(AAE2022KFO2)
重庆交通大学研究生科研创新项目(2023S0026)。
关键词
组合周期
十字减振沟
带隙特性
减振性能
振幅衰减系数
低频带隙
combination period
cross vibration isolation trenches
band gap characteristic
vibration isolation performance
amplitude attenuation ratio
low-frequency band gap
