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三维有限长声屏障声压简化算法

, PP. 153-158

Keywords: 环境工程,声压简化算法,理论模型预测法,声屏障,声波绕射,快速多级边界元方法

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Abstract:

为了深入研究三维有限长声屏障的声学特性,采用理论模型预测法,基于声波绕射理论,在二维声屏障声压计算的基础上,考虑声屏障侧面绕射声的影响,给出了三维有限长单侧声屏障、平行声屏障的声压简化算法。为了验证简化算法的正确性,在Virtual.lab软件中利用快速多极边界元方法(FastMultipoleBoundaryElementMethod,FMBEM)仿真声屏障的声学性能。通过算例将2种方法进行对比,在20~2000Hz频率范围内,计算结果基本吻合,趋势一致,计算单侧声屏障的声压时,平均绝对误差为1.95dB,平均相对误差为2.98%;计算平行声屏障的声压时,平均绝对误差为2.43dB,平均相对误差为3.75%,证明了该方法的可行性。简化算法公式简单实用、不需积分、便于计算,在设计声屏障时可减少复杂度,可为三维有限长声屏障的设计提供一定的参考,具有一定的工程价值。

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