廊道悬浮声屏障噪声预测及控制方案研究

Study on Noise Prediction and Control Scheme of Corridor Suspension Noise Barrier

廊道作为燃煤输送的主要通道,其噪声对附近居民影响较大。布置声屏障是目前主要的治理方案,但工程噪声预测软件不能准确模拟计算廊道带下方挑檐悬浮声屏障的噪声,从而无法综合评估各常用类型声屏障在廊道噪声控制方案中的治理效果。以Cadna/A预测软件几何建模为基础,利用几何位置关系将声屏障下挑檐绕射转化成可计算的上挑檐绕射,并通过理论计算验证该方法的可行性。应用该方法对某电厂廊道进行噪声预测建模,对上下挑檐声屏障、更换低噪声托辊、低噪声托辊配合上下挑檐声屏障三种噪声控制方案进行模拟计算,结果表明:三种方案均可在不同工程量情况下达到声环境质量2类标准。进一步通过经济性分析,更换低噪声托辊性价比最佳。采用的噪声预测建模策略可实现各类悬浮声屏障的噪声预测,各控制方案对比分析也可为同类型廊道噪声治理提供科学依据,具有较大的应用价值。

The corridor is the main channel for coal transportation,but the noise generated has a large impact on nearby residents.Deploying noise barriers is the main scheme at present,but noise prediction softwares cannot accurately simulate and calculate the noise of the corridor with lower eave suspension noise barriers,thus cannot comprehensively evaluate common used noise barriers in corridor noise control schemes.Based on the geometric modeling of Cadna/A prediction software,the geometric position relationship was used to transform the lower eave bypass of the noise barrier into a calculable upper eave bypass,and the feasibility of the method was verified by theoretical calculation.This method was applied to establish a noise prediction model of a power plant corridor,and three noise control schemes were simulated:upper and lower eave noise barriers,replacement of low-noise rollers,and low-noise rollers with upper and lower eave noise barriers.The results showed that all three schemes can achieve class II environmental quality standard for noise with different workloads.Further economic analysis showed that the replacement of low-noise rollers was the most cost-effective.The noise prediction modeling strategy adopted in this paper can predict the noise of various types of suspension noise barriers,and the comparative analysis of each control scheme provides a scientific basis for the noise control of the same type of corridors,presenting a high application value.