扣件刚度与阻尼对铁路箱梁车致振动噪声的影响研究

发布时间：2018-03-22 03:18

本文选题：铁路箱梁　切入点：结构噪声　出处：《振动与冲击》2015年15期 　论文类型：期刊论文

【摘要】：为了探明扣件刚度和阻尼对箱梁结构噪声的影响,基于车-线-桥耦合振动理论和声学边界元理论,建立了箱梁结构噪声预测的混合有限元-边界元法,并进行现场试验验证。在此基础上,分析了扣件刚度与阻尼对32 m简支箱梁结构噪声的声场分布规律与频谱特性、轮轨相互作用力的影响规律。结果表明:混合有限元-边界元法能较好地预测箱梁结构噪声,结构噪声的峰值频段为40~80 Hz,噪声峰值频率主要受扣件刚度的影响;距地面1.2 m高,近轨侧10~40 m和40~100 m范围内的声压级衰减率为0.29 d B(Lin)/m和0.067 d B(Lin)/m;扣件刚度增加将显著降低梁侧声场的指向角,扣件刚度自10 MN/m增加到100 MN/m时,近轨侧30 m纵断面的声压级平均增加12.5 d B(Lin),结构噪声和轮轨力的峰值频率均从30 Hz同步增大到67 Hz;扣件阻尼比对梁侧声场的指向性影响较小,扣件阻尼比从0.062 5增加到0.5时,近轨侧30 m纵断面的声压级平均降低5.0 d B(Lin),结构噪声和轮轨力的峰值频率均保持不变。
[Abstract]:In order to investigate the effects of fastener stiffness and damping of the box girder structure noise, vehicle track bridge coupling vibration theory and acoustic boundary element is established based on the theory of the finite element prediction of box girder structure noise boundary element method, and in-situ test. On this basis, analysis of the fastener stiffness and damping the noise of 32 m simply supported box girder structure of the acoustic field distribution and spectrum characteristics, influence of wheel rail interaction force. The results show that the hybrid finite element boundary element method can better predict the box girder structure noise, peak band structure noise is 40~80 Hz, the noise peak frequency is mainly affected by the fastener stiffness effect; distance 1.2 m above the ground, near the rail side of 10~40 m and 40~100 sound pressure level within the range of M decay rate is 0.29 D B (Lin) /m and 0.067 D B (Lin) /m; the fastener stiffness increase will be significantly reduced to beam side field angle, fastener stiffness from 10 MN/m to 100 MN/m, The sound pressure level near the rail side of the vertical section of the 30 m increased by an average of 12.5 D B (Lin), the peak frequency of the structure noise and wheel rail force from 30 Hz increased to 67 Hz; the fastener damping ratio on the side beam directivity is less affected, the fastener damping ratio increased from 0.0625 to 0.5, the sound pressure level near the rail side 30 m the vertical section of the average reduction of 5 d B (Lin), the peak frequency of the structure noise and wheel / rail forces remain unchanged.

【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金(51378429;51308469) 中央高校基本科研业务费专项资金(2682014BR053)
【分类号】：U211.3;U441.3;TB53

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