摘要
桥面轻质吸声铺层材料因其重量轻、成本低以及施工易等特点,具有广阔应用前景。为了评估城市轨道交通桥面板轻质吸声铺层降噪效果,基于统计能量分析法,建立轮轨噪声数值预测模型,在此基础上,从桥面板轻质吸声铺层吸声系数、厚度和铺设位置3个方面,分析桥面板轻质吸声铺层的降噪效果。研究结果表明:桥面板轻质吸声铺层吸声系数取为0.4时,梁体附近降噪量约为8 dB(A),但相较于吸声系数取为0.2时,降噪效果提升幅度并不明显;桥面板轻质吸声铺层厚度取为100和200 mm时,梁体附近降噪量分别约为8、12 dB(A);桥面板轻质吸声铺层铺设位置不同时,梁体附近降噪量约为6~8 dB(A),降噪效果从大到小依次为:桥面全部铺设、内外轨两侧铺设、内外轨中间铺设。
Due to its characteristics of light weight,low cost and easy for construction,the lightweight sound-absorbing bridge deck layer material has broad application prospects.In order to evaluate the noise reduction effect of lightweight sound-absorbing layer on urban rail transit bridge deck,a wheel-rail noise numerical prediction model was established based on statistical energy analysis.On this basis,the noise reduction effect of light sound-absorbing layer on bridge deck was analyzed from three aspects of sound absorption coefficient,thickness and laying position.The results show that when the acoustical absorption coefficient of the lightweight sound absorbing layer on the bridge deck is 0.4,the noise reduction near the beam body is about 8 dB(A),but compared with that when the acoustical absorption coefficient is 0.2,the noise reduction effect is not significantly improved.When the thickness of the lightweight sound-absorbing layer on the bridge deck is 100 mm and 200 mm,the noise around the beam structure is reduced by about 8 dB(A)and 12 dB(A)respectively.When the sound-absorbing layers are laid on both sides of the track,the noise around the beam structure is reduced by 6-8 dB(A).The all deck laying of the lightweight sound absorption layer has the largest noise reduction effect,follow by laying it on both sides of the track,and laying it in the middle of the track.
作者
梁进学
张良涛
朱红丽
王振刚
张艺升
宋立忠
LIANG Jinxue;ZHANG Liangtao;ZHU Hongli;WANG Zhengang;ZHANG Yisheng;SONG Lizhong(Wuhan Metro Group Co.,Ltd.,Wuhan 430033,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)
出处
《噪声与振动控制》
北大核心
2025年第5期247-252,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(52378450)。
关键词
声学
轨道交通
轻质吸声铺层
降噪效果
acoustics
rail transit
lightweight sound-absorbing layer
noise reduction effect
