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桥梁结构健康监测系统中安全评价环节的差错控制研究 【作者】胡顺仁 【导师】陈伟民

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作者胡顺仁导师陈伟民
_6CZ4H R'GD%zd|0【作者基本信息】重庆大学,仪器科学与技术,2007年,博士水利论文*B9G ol!Qh] B

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【中文摘要】 桥梁结构的安全问题一直都被学术界和工程界高度重视,而结合信息技术和力学理论的桥梁结构健康监测技术,由于能实时在线诊断桥梁结构的早期故障、及时发现桥梁结构的事故先兆,成为了替代传统的桥梁现场人工荷载试验方法的一个理想手段。迄今为止,桥梁结构健康监测技术都围绕信息获取与安全评价两个关键环节开展研究,并取得了一些进展。但是,由于系统原始数据在采集、传输过程中受诸多因素影响,桥梁的复杂性和桥梁结构健康监测系统的复杂性使得原始数据不可避免地会产生失真与变异,最终将导致系统产生错误的诊断结果,系统原始数据的可靠性就成为桥梁结构健康监测技术发展的一个亟待解决的关键问题。原始数据的可靠性问题由于涉及到信息技术与结构工程两大学科领域,且是两大学科交叉上的薄弱点,因此,它成了当前制约桥梁结构健康监测技术发展的一个瓶颈问题。针对这一问题,本文结合国家科技部863项目(2006AA04Z433)和国家科技攻关计划引导项目(2002BA105C),在深入分析桥梁结构健康监测系统数据失真的表现形式和特点基础上,引入数据通信领域的差错控制思想和概念,完成了以下几方面研究:①以混凝土斜拉桥和连续刚构桥为代表,详尽分析...更多桥梁结构参数的主要影响因素,以此建立桥梁结构数据的响应函数,从而揭示了桥梁结构健康监测系统的数据失真表现形式和基本特点,并形式化描述和说明了单点数据失真和连续数据段失真两种基本数据失真形式,探讨了桥梁结构健康监测系统数据失真问题复杂性的原因;②针对桥梁结构状态健康监测系统中数据失真问题在信息获取环节、安全评价环节孤立处理的现状,引入数据通信领域数据差错控制的基本思想,分析其差错控制的内涵和机制,由此而建立桥梁结构健康监测系统差错控制理论基础,构造差错控制的检错模型和纠错模型,及桥梁结构健康监测系统几个单元的差错控制机制;③数据之间的关联性是桥梁结构状态健康监测系统中差错控制技术研究的基础,从桥梁结构数据出发,分析了桥梁结构测量点之间的关联性,给出了桥梁结构测量点之间关联定义及关联的几种表现形式,并结合数据挖掘理论和信号与系统相关理论,建立了关联度模型来定量描述桥梁结构测量点之间的关联特性;④以桥梁结构测量点之间的关联性为基础,针对桥梁结构健康监测系统安全环节的数据失真的两种表现形式——单点数据失真和连续失真数据段,结合信息学科中数据信号处理在数据失真识别上已经取的成果,根据桥梁结构数据的失真的特点,提出了实现桥梁结构健康监测系统中安全评价环节差错控制的方法:a.基于关联稳态模型方法和数据变化趋势方法来识别单点失真数据,和基于关联度模型来识别连续失真数据段的方法;b.基于RBF神经网络模型和基于趋势曲线来恢复失真数据的方法;最后,根据本课题取得的研究理论成果制定了差错控制软件体系和软件流程,开发了相应的软件系统,并以重庆马桑溪长江大桥桥梁结构健康监测系统等实际系统为对象进行了实验验证,对软件差错控制的效果进行了分析和评价。结果表明:将数据通信领域的差错控制思想引入桥梁结构健康监测系统,从系统高度建立桥梁结构健康监测系统的差错控制理论,有望全面解决系统中的数据失真问题,提高系统数据的可靠性;结合数据挖掘和信号与系统理论建立的关联度模型,为后续差错控制分析奠定了基础;针对桥梁结构健康监测系统安全环节数据失真特点,提出的基于数据变化率、主成分分析、关联度模型、RBF神经网络模型、数据趋势曲线等方法,有效地解决了安全环节的数据失真识别和恢复问题,并在实桥的实验验证中取得了较为成功的实践效果。  还原水利论文9^1wpc `U\c

!DU i$k3I9G0【英文摘要】 Novel health monitoring strategies for highway bridges and transportation infrastructure are of primary significance. A main objective of health monitoring is to detect, locate, and assess the level of structural damage to the civil infrastructure. In this regard, an integrated structural health monitoring framework is being developed to incorporate all tasks from sensor configuration, data acquisition and control, to decision-making and resources allocation. So far, the development history of the bridge structural health monitoring system has carried out research for them. However, it makes the original data reliability badly that the structural complexity of bridge and the complexity of bridge structural health monitoring system, causes the data distortion, results in error diagnosis, so the original data reliability has become bottle-neck to restrict the technology development of the bridge structural health monitoring. Because of the tremendous difference in the professional backgr...更多ound, the researcher have to just make the study on the information acquirement and safety assessment in the health monitoring of bridge in each of their own major area, the problem of data reliability becomes the key point between them, and also challenge of bridge structural health monitoring technology. In this dissertation, combining with the National Hi-Tech Research and. Development Program (863) of China(No.2006AA04Z433), and the National Key Technology and R&D program(2002BA105C), the idea and concept of error control of the data communication field based on analyses carefully the data distortion expressionism is introduced, discussing the scientific and engineer significance, and the researching routine is proposed.The main content is stated in detail as following:①Taking the cable-stayed bridge as an example, the structural main effect of the bridge are researched and analysis deeply, then creating the data generative function of bridge structure, then analyzing the characteristic of the single invalid data and the continuous invalid data for the bridge structural health monitoring system, and formalizes and describes them, discussing the complexity of data distortion, establishing the solid foundation for research of error control of safety assessment for the bridge structural health monitoring system;②According to the actuality of data distortion in field of bridge structural health monitoring system, which had dealt with solely on the information acquirement and the safety assessment, introducing the idea and concept of error control in the data communication field, analyzing its meaning and mechanism, then establishing the basal theory of error control for bridge structural health monitoring system, including checking mode, correcting model, and mechanism, that may resolve the problem of data reliability for bridge structural health monitoring system thoroughly, and these researches has not been reported at all times;③Analyzing the correlation among the bridge checking points according to the bridge structural data, defining the correlation of bridge checking points and describes its several forms, then integrating the correlative theory of data mining and signal system to establish the correlation model to describe the correlation among the bridge checking points quantificationally, and putting forward the error control methods on safety assessment of the bridge structural health monitoring system: (A) based on relation steady equation and data variety rate to identify the identify the single invalid data, and based on correlation model to identify the continuous invalid data;(B) based on the RBF neural networks and trendline method to restore invalid data.Finally, the error control software for the proposed method is developed and applied in the structural safety assessment in Masangxi Yangtze River bridge in Chongqing as a real example. Meanwhile, the software has also applied to Chongqing Gaojiahuayuan bridge, Chongqing Xiangjiapo bridge, Chongqing Shibanpo bridge, and it obtains better application effect in engineer practice.  还原水利论文6`.V{z]'B

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【中文关键词】 桥梁; 数据可靠性; 安全评价; 数据失真; 差错控制; 关联分析; 失真识别; 失真恢复
*yk.l1{^5W0【英文关键词】 bridge structure; safety assessment; data reliability; data distortion; error control; correlation; distortion identifying; distortion restoring水利论文9X}yg Z |$ZU
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TAG: 陈伟民 导师 监测系统 胡顺仁 桥梁结构
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