泡沫混凝土声屏障吸声特性研究

发布时间：2018-03-21 18:56

本文选题：环境工程　切入点：声屏障吸声特性　出处：《公路交通科技》2017年03期 　论文类型：期刊论文

【摘要】：为研究泡沫混凝土声屏障的吸声特性,针对复合型声屏障的结构形式及声屏障的顶端结构类型建立优化模型。基于声屏障的吸声基本理论和环境声学的边界元理论,利用交通噪音的频谱特性,分析不同声屏障高度及不同受声点高度时声屏障插入损失分布规律的影响,研究了复合型声屏障的结构形式及声屏障的顶端结构类型对声屏障插入损失分布规律的影响。研究结果表明:泡沫混凝土吸声型声屏障在近声源侧,声屏障插入损失为零;在远声源侧,声屏障插入损失的分布分为干涉、衰减及稳定3个阶段。声屏障的高度和受声点高度仅能影响近距离的声场分布,在远声源侧稳定阶段各高度的声屏障插入损失相差不超过0.2 d B;复合型声屏障在近声源侧声屏障插入损失存在负值,吸-隔-吸组合形式的复合型声屏障降噪效果最优;顶端结构为圆弧形声屏障的降噪效果优于30°折壁型和直壁型。
[Abstract]:In order to study the sound absorption characteristics of foam concrete sound barrier, an optimized model is established for the structural form of compound sound barrier and the top structure type of sound barrier. The basic theory of sound absorption based on sound barrier and the boundary element theory of environmental acoustics are presented. Based on the spectral characteristics of traffic noise, the influence of different height of sound barrier and different height of sound point on the distribution of insertion loss of sound barrier is analyzed. The influence of the structure form of the compound type sound barrier and the top structure type of the sound barrier on the distribution of the insertion loss of the sound barrier is studied. The results show that the insertion loss of the sound barrier is zero near the sound source side of the foam concrete sound absorption type sound barrier. On the far side of the sound source, the distribution of the insertion loss of the sound barrier is divided into three stages: interference, attenuation and stabilization. The height of the sound barrier and the height of the sound point can only affect the distribution of the sound field at close range. The insertion loss of each height of sound barrier is not more than 0.2 dB at the stable stage of distant sound source, the insertion loss of compound type sound barrier is negative in the near side of sound source, and the noise reduction effect of compound type sound barrier is the best in the form of combination of absorption-isolating-suction. The noise reduction effect of circular arc noise barrier with top structure is better than that of 30 掳fold wall and straight wall type.
【作者单位】：湖北工业大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(51378182) 湖北工业大学博士科研启动基金项目(BSQD12053)
【分类号】：U491.91

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