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Hybrid FE-SEA model and test validation for box-girders radiated low-frequency noise
Author(s): 
Pages: 237-245
Year: Issue:  2
Journal: Journal of Vibration Engineering

Keyword:  box-girderstructure-radiated noiseFE-SEA modeltest validationacoustic contribution;
Abstract: 为了分析铁路混凝土箱梁的低频噪声,建立包含钢轨、无砟轨道结构和箱梁结构的混合FE-SEA预测模型,并采用现场试验数据进行模型验证.在此基础上,探讨了箱梁各板件的声贡献量和振动传递规律.结果表明:混合FE-SEA模型能够准确预测箱梁的振动及声辐射,并且具有极高的计算效率;箱梁底板、翼板和腹板的振动与噪声优势频段为40~63 Hz,并在轮轨相互作用力最大的中心频率50 Hz处达到最大值;顶板、翼板和底板对远场噪声起主要作用,且前两者的声贡献量可达75%以上,应作为主要降噪对象;振动功率传递过程中,频谱特性保持不变,且峰值中心频率始终为50 Hz,应作为减振降噪的主要频段;箱梁各板件振动能量的大小规律与其对远场声贡献量的大小规律一致.
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