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随着城市轻轨建设的发展,交通噪声污染逐渐引起人们重视。在轻轨桥架两侧设置声屏障是控制轨道噪声的重要措施之一。声屏障的高昂成本往往是由不合理的设计参数造成的,通过对目前声屏障设计方法进行分析,提出了轻轨桥架声屏障优化设计方法。该方法以声屏障建造成本为目标函数,以降噪要求为声学约束,综合考虑设置位置、高度和长度等设计变量的影响;由列车噪声1/3倍频程频谱计算插入损失,提高了优化过程中插入损失的计算精度。该优化设计法与目前设计方法对比,验证了声屏障优化设计在改善降噪性能和经济性能方面的优越性。讨论了设计参数对成本和降噪性能的影响,并且对轨边矮墙的降噪性能进行了分析,所获的结论对声屏障和轨边矮墙设计参数与形状的选择具有指导意义。
With the development of urban light rail transit, traffic noise pollution gradually attracts people’s attention. Setting sound barriers on both sides of the LRT is one of the important measures to control orbital noise. The high cost of acoustic barrier is often caused by unreasonable design parameters. Based on the analysis of the current design of acoustic barrier, the optimization design method of acoustic barrier for light rail bridge is proposed. The method takes the sound barrier construction cost as the objective function, takes the noise reduction requirement as the acoustic constraint, and considers the influence of design variables such as setting position, height and length. The insertion loss is calculated by 1/3 octave spectrum of train noise to improve the optimization Insertion loss calculation accuracy in the process. Compared with the current design method, the optimized design method verifies the superiority of the sound barrier optimization design in improving the noise reduction performance and the economic performance. The influence of design parameters on the cost and noise reduction performance is discussed. The noise reduction performance of the low profile rail wall is analyzed. The conclusions obtained are of guiding significance for the selection of the design parameters and shape of the acoustic barrier and the low profile rail wall.