移动交通荷载作用下桥梁振动信号分离与去噪的移动窗函数方法  

Moving Window Method for Separation and Noise Reduction of Bridge Vibration Signals under Moving Traffic Load

作　　者：刘添俊[1] 安关峰[1] 张蓉[1] LIU Tian-jun;AN Guan-feng;ZHANG Rong(Guangzhou Municipal Group Co., Ltd., Guangzhou 510000)

机构地区：[1]广州市市政集团有限公司,广州510000

出　　处：《广州建筑》2017年第5期27-30,共4页GUANGZHOU ARCHITECTURE

摘　　要：在移动交通荷载作用下桥梁的振动特性是桥梁安全监测的研究重点。本文提出在移动交通荷载作用下桥梁振动信号的一种基于移动窗函数的信号分离与去噪方法,首先定义移动窗函数,对实际响应信号进行FFT变换,确定实际响应信号中各分量信息对应的频率及移动窗函数的参数k,利用确定的参数定义各移动窗函数,对实际响应信号进行依次扫描,逐次分离出各频段的分量信息和噪声。本方法操作简单,分离信号和降噪效果明显,为工程人员提供了一种快捷有效的信号分离方法。Within the service life, the bridge is subjected to the moving traffic load. In this paper, a specific method of signal separation and denoising based on moving window function is presented for the vibration signal of bridge subjected to a moving traffic load. Firstly, a moving window function is defined and the the parameter of window span k is determined by Fast Fourier transformation （FFT） of the measured response, which also gives its components and corresponding frequencies. Then, the moving window function with definite parameter is employed to scan the actual response signal so that the component information and noise with each band are successively separated. This method is efficient with simple operation for engineers to carry out signal separation.

关 键 词：桥梁 移动交通荷载 信号分离与去噪 移动窗函数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U446[交通运输工程—道路与铁道工程]