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城市道路交通噪声的混沌特征及其应用

DOI: 10.3969/j.issn.1674-0696.2015.01.25, PP. 116-120

Keywords: 交通工程,城市道路,交通噪声,混沌特征,相空间重构,trafficengineering,urbanroad,trafficnoise,chaoticcharacteristics,phasespacereconstruction

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Abstract:

:?通过采集城市道路特征断面的交通噪声,形成时间序列,采用自相关函数法计算延迟时间,当相关系数衰减为0.4时,计算得到相空间重构的延迟时间为12。利用两组噪声样本的训练集计算关联维数,当嵌入维数为6时,关联维数保持不变,确定系统的嵌入维数为3,从而判定两组交通噪声样本存在混沌特征。根据重构的相空间、状态点及临近点计算拟合参数,分别对两组噪声样本进行混沌预测,并与检验集比对,结果表明:混沌模型可以用于短时城市道路交通噪声预测,两组噪声样本的预测平均相对误差分别为8.56%和9.33%。

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