库内线不同减振扣件刚度组合对双层车辆段上盖建筑振动噪声影响研究  

Influence of different stiffness combinations of damping fasteners on vibration and noise of upper building of double-deck depot excited by garage inner track

作　　者：冯青松[1] 江煊 成功[1] 刘庆杰[1] 陈艳明 徐浩能 涂勤明 FENG Qingsong;JIANG Xuan;CHENG Gong;LIU Qingjie;CHEN Yanming;XU Haoneng;TU Qinming(State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [2]广州地铁设计研究院股份有限公司,广东广州510010

出　　处：《铁道科学与工程学报》2023年第9期3320-3330,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52068029,52178423,51878277);江西省主要学科学术和技术带头人培养计划(20194BCJ22008);江西省重点研发计划(20192BBE50008)。

摘　　要：城市地铁列车在半下沉式车辆段内库内线运行时会引起振动噪声并传递至车辆段上盖建筑,因此,在控制建造成本的前提下如何实现更优的减振降噪效果是建设车辆段上盖建筑时需要考虑的关键问题。基于结构和声学有限元方法,建立车辆−轨道−盖板−建筑物耦合模型并进行振动噪声数值仿真计算,采用3种减振扣件组合进行振动噪声对比分析。研究结果表明:车辆段上层采用中等减振扣件、下层采用高等减振扣件的组合能达到更好的减振降噪效果,Z振级的插入损失为2.05~4.5 dB,等效A声级的插入损失为2.33~3.29 dB。采用减振扣件组合后,扣件刚度降低,振动加速度级的峰值频率由40 Hz降低至25 Hz左右,A计权声压级的峰值频率不变,在50 Hz左右。地铁列车运行引起的上盖建筑客厅和卧室的Z振级与等效A声级之间相关系数分别为0.822和0.599,客厅和卧室的振动加速度级和等效声压级之间相关系数分别为0.832和0.831,说明地铁列车运行引起的上盖高层建筑振动与二次结构噪声之间有一定相关性。在评价实际工程的室内二次结构噪声水平的时候,应根据室内声压分布情况选取合适的控制点进行评价。以墙角为圆心、半径1~1.5 m的1/4圆范围内的测点较能反映室内最大二次结构噪声水平,室内中心测点的二次结构噪声最小。研究成果可为半下沉式车辆段库内线上盖建筑的振动噪声控制提供参考。The operation of urban subway trains in the garage inner line of the semi-submerged depots will cause vibration and noise that transmit to the upper building.Therefore,under the premise of controlling the construction cost,how to achieve better vibration reduction and noise reduction is a key issue to be considered when constructing the upper building.Based on the structural and acoustic finite element method,this paper established a vehicle-track-cover plate-building coupling model,and carried out numerical simulation of vibration and noise.Three kinds of damping fastener combinations were adopted.The vibration and noise were compared and analyzed.The results are drawn as follows.When the upper layer of the metro depot adopts medium damping fasteners,and the lower layer adopted superior damping fasteners can achieve better vibration and noise reduction effects.The insertion loss of Z-weighted vibration level(Z-VL)is 2.05~4.5 dB,and the insertion loss of equivalent A-weighted sound pressure level(A-SPL)is 2.33~3.29 dB.After using the combination of damping fastener,the stiffness of the fastener is reduced,and the peak frequency of the vibration acceleration level is reduced from 40 Hz to about 25 Hz,the peak frequency of the A-SPL remains unchanged,around 50 Hz.The correlation coefficients between the Z-VL and the A-SPL of the living room and bedroom of the upper building caused by the operation of the subway train are 0.822 and 0.599,respectively.The correlation coefficients between the vibration acceleration level and the equivalent sound pressure level of the living room and bedroom are 0.832 and 0.831,respectively.It shows that there is a certain correlation between the vibration and secondary structure noise of the high-rise upper building caused by the operation of subway trains.When evaluating the indoor secondary structure noise level of the actual project,the appropriate control points should be selected for evaluation according to the indoor sound pressure distribution.Selecting the measuring points wit

关 键 词：减振扣件组合 上盖建筑 数值模型 环境振动 二次结构噪声 半下沉式地铁车辆段 

分 类 号：TB535[理学—物理] U231[理学—声学]