摘要
针对地铁列车引起的环境振动问题,该研究基于局域共振机理提出了一种具有拉压-扭转特性的手性超结构隔振器,并建立振动传递特性有限元模型与车辆—轨道—基底耦合动力学数值模型,从频响特征与动力响应的角度研究了使用手性超结构隔振器浮置板轨道系统的减振性能,进而研究浮置板垂向位移减小情况。结果表明:手性超结构隔振器的等效垂向刚度主要受支撑杆控制;衰减域的起始频率受软材料包覆层的影响;手性超结构隔振器浮置板轨道在保留钢弹簧浮置板轨道原有减振效果的同时,还增加了对特定频段振动传递的衰减效果,但在衰减域外产生了一个共振峰,通过在结构中设置阻尼可以减小共振峰的影响;手性超结构隔振器浮置板轨道系统可以更有效地控制地铁列车荷载激励所引起的浮置板垂向位移,其对位移的减小效果可达11.5%。
To address the environmental vibration problem caused by subway trains,this paper proposes a chiral superstructure vibration isolator structure with tensile-torsional characteristics was proposed based on the local resonance mechanism.A finite element model was established for analyzing the vibration transmission characteristics,a mathematical dynamics model was built for examining the vehicle-track-substrate coupling effect,and the vibration reduction performance of the chiral superstructure vibration isolator floating slab track system was investigated from the perspective of frequency response characteristics and dynamic response.Then,the reduction of the vertical displacement of the floating slab was studied.The results show that:the equivalent vertical stiffness of the chiral superstructure vibration isolator is mainly controlled by the support rod;the onset frequency of the decay domain is influenced by the soft material cladding;the chiral superstructure vibration isolator floating slab track retains the original damping effect of the steel spring floating slab track while increasing the attenuation effect on the vibration transmission in specific frequency bands,but a resonance peak being generated outside the decay domain,the effect of which can be reduced by setting damping in the structure.The chiral superstructure vibration isolator floating slab track system can more effectively control the vertical displacement of the floating slab caused by the subway train load excitation,compared with the steel spring floating slab.Its effect on the displacement reduction can reach 11.5%.
作者
贺利工
赵才友
刘文武
孔晓钰
罗信伟
HE Ligong;ZHAO Caiyou;LIU Wenwu;KONG Xiaoyu;LUO Xinwei(Guangzhou Metro Design and Research Institute Corporation Ltd.,Guangzhou 510010,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第22期248-255,共8页
Journal of Vibration and Shock
基金
高速铁路基础研究联合基金(U1734207)
国家自然科学基金面上项目(51978585)
四川省应用基础研究项目(2020YJ0214)。
关键词
手性超结构隔振器
环境振动
局域共振
浮置板轨道
振动衰减
chiral superstructure isolator
environmental vibration
local resonance
floating slab track
vibration reduction
