高速铁路简支梁桥声辐射特性研究  

Research on Sound Radiation Characteristics of Simply Supported Beam Bridge of High-Speed Railway

作　　者：焦世旺 瓮子涵 赵鹤轩 林玉森 Jiao Shiwang;Weng Zihan;Zhao Hexuan;Lin Yusen(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第4期40-46,103,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：为研究非标准跨度简支梁耦合振动下声场中的噪声辐射特性,建立了车-线-桥耦合动力学模型,求解出CRH2列车经过桥梁时的竖向轮轨力,将竖向轮轨力作为外部激励加载至简支箱梁声学分析软件中,以桥梁动力响应为声学边界条件,运用边界元法求解频域内桥梁结构声辐射特性。研究表明,结构噪声主要分布于梁体上方和梁体下方,梁体上方声压级大于梁体下方;随着车速增加,各场点声压级表现为增大趋势;在翼缘板下设置肋板对声场部分区域降噪效果明显;在全封闭声屏障振动噪声影响下,各场点声压级均有所增大。在不考虑声屏障振动噪声前提下,直立式声屏障对高频噪声的降噪效果较低频噪声更加明显。In order to study the noise radiation characteristics in the sound field under the coupled vibration of non-standard span simply supported beams,a vehicle-line-bridge coupling dynamic model was established,and the vertical wheel rail force when the CRH2 train passed the bridge was solved.The vertical wheel rail force was loaded into the acoustic analysis software of simply supported box girder as an external stimulus.With the bridge dynamic response as the acoustic boundary condition,the boundary element method was used to solve the acoustic radiation characteristics of the bridge structure in the frequency domain.The research shows that the structural noise is mainly distributed above and below the beam body,and the sound pressure level above the beam body is greater than that below the beam body.With the increase of vehicle speed,the sound pressure level at each site shows an increasing trend.The rib plate under the flange plate has obvious effect on noise reduction in some areas of the sound field.Under the influence of the vibration noise of the fully enclosed sound barrier,the sound pressure level of each field point has increased.Without consideration of the vibration noise of the sound barrier,the noise reduction effect of the vertical sound barrier on the high-frequency noise is more obvious than the lower-frequency noise.

关 键 词：铁路桥梁 动力响应 声压级 降噪 

分 类 号：TB132[理学—物理] U441.3[理学—应用物理]