高速铁路减振CRTS-Ⅲ型无砟轨道桥梁振动噪声研究
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摘要
以减振CRTS-Ⅲ型轨道系统为研究对象,基于车辆、轨道、桥梁系统二维模型,利用动柔度法分别计算车辆和轨道系统的动柔度,建立频率域的车辆-轨道耦合模型,计算桥梁振动加速度并与常规CRTS-Ⅲ型轨道系统相比较。采用有限元法计算桥梁结构近场点和远场点噪声,探讨桥梁各子结构板对近场点和远场点噪声的声贡献率。计算结果表明:与常规CRTS-Ⅲ型轨道系统相比,铺设减振CRTS-Ⅲ型轨道系统的桥梁的振动峰值加速度减小69.9%,加速度平均值降低60.4%;近场和远场噪声计算点声压级分别降低8.4 dB、8.5 dB;桥梁顶板声贡献率分别达65.28%、68.30%。采用减振CRTS-Ⅲ型轨道系统能够有效降低桥梁结构噪声。声贡献率计算表明顶板振动是导致桥梁产生噪声的主要噪声源。
The vibration-damped CRTS-III type track system is taken as the research object. Based on the twodimensional model of vehicle, track and bridge system, the dynamic compliance of the vehicle and track system is calculated. The frequency-domain vehicle-track coupling model is established. The bridge vibration acceleration is calculated and compared with that of the conventional CRTS-III type track system. The near-field and far-field noises of the bridge structure are calculated using the finite element method, and the acoustic contribution rates of the sub-structures of the bridge to the near-field and far-field noise are discussed. The calculation results show that compared with the conventional CRTS-III type track system, the vibration peak acceleration of the bridge is reduced by 69.9 %; the average acceleration is reduced by 60.4 %; the sound pressure levels at the near-field and far-field noise measurement points are decreased by 8.4 dB and 8.5 dB, respectively; the acoustic contribution ratios of the bridge roof reach 65.28 % and 68.30 % respectively. It is concluded that the use of vibration-reduction CRTS-III rail system can effectively reduce the noise of the bridge structure.The calculation of the acoustic contribution ratio shows that the roof vibration is the major noise source that causes the bridge noise.
The vibration-damped CRTS-III type track system is taken as the research object. Based on the twodimensional model of vehicle, track and bridge system, the dynamic compliance of the vehicle and track system is calculated. The frequency-domain vehicle-track coupling model is established. The bridge vibration acceleration is calculated and compared with that of the conventional CRTS-III type track system. The near-field and far-field noises of the bridge structure are calculated using the finite element method, and the acoustic contribution rates of the sub-structures of the bridge to the near-field and far-field noise are discussed. The calculation results show that compared with the conventional CRTS-III type track system, the vibration peak acceleration of the bridge is reduced by 69.9 %; the average acceleration is reduced by 60.4 %; the sound pressure levels at the near-field and far-field noise measurement points are decreased by 8.4 dB and 8.5 dB, respectively; the acoustic contribution ratios of the bridge roof reach 65.28 % and 68.30 % respectively. It is concluded that the use of vibration-reduction CRTS-III rail system can effectively reduce the noise of the bridge structure.The calculation of the acoustic contribution ratio shows that the roof vibration is the major noise source that causes the bridge noise.
引文
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[2]辛涛,张琦,高亮,等.高速铁路CRTSⅢ型板式无砟轨道减振垫层动力影响及结构优化[J].中国铁道科学,2016,37(5):1-7.
[3]任娟娟,赵华卫,李潇,等.减振CRTSⅢ型板式无砟轨道结构谐响应分析[J].铁道工程学报,2016,210(3):44-50.
[4]周毅.CRTS-Ⅲ型板式轨道减振特性研究[D].成都:西南交通大学,2009.
[5]石广田,张小安,杨新文,等.CRTSⅢ型板式无砟轨道桥梁区段动力学分析[J].噪声与振动控制,2016,36(1):109-113.
[6]WANG A,COX S J,GOSLING D,et al.Railway bridge noise control with resilient baseplates[J].Journal of Sound and Vibration,2000,231(3):907-911.
[7]易强,王平,赵才友,等.高架铁路环境噪声空间分布特性及控制措施效果研究[J].铁道学报,2017,39(3):120-127.
[8]WATANABE T,SOGABE M,ASANUMA K,et al.Development of silent steel railway bridge equipped with floating ladder track and floating reinforced concrete deck[J].Journal of Mechanical Systems for Transportation&Logistics,2010,3(1):83-91.
[9]ZHAO CAI YOU,WANG PING.Effect of elastic rubber mats on the reduction of vibration and noise in high-speed[C].Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit,2018,232(6):095440971775220.
[10]李小珍,张迅,李亚东.高速铁路简支箱梁结构噪声的边界元方法[J].土木工程学报,2011(44):95-101.
[11]张迅,李小珍,刘全民,等.混凝土箱梁的结构噪声及其影响因素[J].西南交通大学学报,2013,48(3):409-414.
[12]K W NGAI,NG C F.Structure-borne noise and vibration of concrete box structure and rail viaduct[J].Journal of Sound and Vibration,2002,255(2):281-297.
[13]石广田,杨建近,杨新文,等.基于动柔度法的车-线-桥垂向耦合振动分析[J].中南大学学报中南大学学报(自然科学版),2017,48(4):1119-1126.
[14]雷晓燕.高速铁路轨道动力学-模型、算法与应用[M].北京:科学出版社,2015:229.
[15]刘林芽,付奇川,邵文杰,等.箱型桥梁结构的面板声学贡献分析[J].铁道科学与工程学报,2015,12(4):743-748.