文档介绍：河北工业大学
硕士学位论文
小波变换在旧桥实时监测系统中应用研究
姓名:刘海亮
申请学位级别:硕士
专业:结构工程
指导教师:周建宾
20071101
河北工业大学硕士学位论文
小波变换在旧桥实时监测系统中应用研究
摘要
车辆的超载、超限运行,桥梁养护经费的不足,使桥梁长期处在病态的工作状态。既
有旧桥的安全运营一直是人们较为关注的热点问题,国内、外桥梁不断发生的坍塌事故,
给人们敲响了警钟。近年来,桥梁的实时监测成为比较活跃的研究领域,它涉及多门学科,
多项技术,是一项非常实用的在线监测系统。使人们对桥梁结构的工作状态、健康情况有
了一个明确地认识。
小波变换理论是近年来迅速发展起来的新兴学科,已成为众多领域的研究热点。本文
首先对国内外桥梁的监测研究现状进行了全面、系统的评述,介绍了桥梁实时监测系统的
构成及工作过程,然后详细介绍了小波变换的概念和它具有良好时频局部与多分辨率分析
特性,及在桥梁实时监测系统中应用的可行性,并利用 Matlab 和 ANSYS 仿真试验验证了
小波变换在信号去噪和小波的奇异性检测原理分析突变信号的能力。最后,结合三座既有
桥梁的现场试验,对结构的动力信号进行实时监测,通过对信号的小波分析,观察不同尺
度下信号图像,来判断结构损伤的存在。由于多尺度分析方法具有较高的计算效率,能够
通过预警阀值的设置,来进行实时监测的在线预警。
关键词:小波变换,旧桥,实时监测
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小波变换在旧桥实时监测系统中应用研究
APPLICATION STUDY OF WAVELET TRANSFORM USED IN
OLD BRIDGE ON-TIME MONITORING SYSTEM
ABSTRACT
Bridge was always under morbid state because of overload and overrun.,and lack of
driving on the old bridge is especially paid close attention to,lots of bridges collspse
both at home and abroad,sound the alarm for ,Bridge on-time monitoring is a
useful on line monitor system , which ing the most lively field of research and involved
many subjects and also can help people realize the state of health clearly when the
bridge is under using.
Wavelet theory is a very fast developing subject,it is a hot spots of many research
mentate the present research situation of the bridge monitoring both at home
and abroad overall and systematic in the first,and provide ponent part and procedure of
work of the bridge on-time monitoring system,and then detailed introduce the concept of the
wavelet and its many satisfying characteristics of time-frequency localization and
multi-resolving power and the fessibility of apply on the bridge on-time monitoring
provides the ability of the wavelet in reject noise and analyse sudden change signal by
singularity detection with Matlab and Ansys emulate scene test of three
bridges,analyse the signals of