模式识别在工程结构振动损伤识别中的应用
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摘要
工程结构与人类的生活息息相关,工程结构的质量问题不仅关系到人民的生命财产
    安全,而且还会带来社会财富的巨大损失。但事实上,工程结构往往存在各种各样的缺
    陷和损伤。进行结构损伤诊断,可以提高结构的可靠性与安全性,避免重大事故的发生,
    减少事故危害性,可以获得潜在的巨大的经济效益和社会效益。
    结构损伤检测的方法很多,振动测试技术由于易于实现诊断系统的自动化、小型化,
    且理论基础雄厚、分析测试设备完善、诊断结果准确可靠,加上振动诊断具有实时性、
    在线性、遥测性、可控性和提取信号的方便性等诸多优点而在工程诊断技术中占主导地
    位,在结构损伤诊断中具有广阔的应用前景。
    振动诊断的方法很多,常用的有三种:直接分析法,时序分析法和参数识别法。其
    中参数识别法直接从测量的输入输出信号识别模态参数或物理参数的变化情况,具有很
    大的方便性。基于模态分析的振动诊断技术自 20 世纪 60 年代兴起至今,已在工程领域
    得到了广泛的应用。从目前来看,单一模态参数的诊断方法比较常见。而基于模态参数
    识别的振动诊断属于动力学的反问题,从数学上看,反问题往往不唯一和不确定,从而
    使识别结果可能不唯一,出现误判。所以目前多参量的综合诊断技术已经兴起,模式识
    别,人工智能,专家系统等的研究成果为损伤诊断注入了新的活力。其中模式识别是人
    工智能的一个重要分支,将模式识别或人工智能的理论和方法应用于结构损伤诊断,发
    展智能化的损伤诊断技术已成为当今故障诊断技术的发展的主流。
    本文选取悬臂梁作为典型构件,将模式识别理论和方法应用到基于模态分析的振动
    诊断技术中,利用由模态参数构造的损伤信息特征量建立损伤模式,对结构损伤的位置
    和程度进行分步识别,从而提高了损伤诊断的精度。
Engineering structure is closely linked with human Beings’ life; its
    quality problem not only connects to the safety of the people’s life and wealth,
    but also causes great loss of social wealth. But engineering structure sometimes
    exists many types defects and damage in fact. The reliability and security of
    structure can be improved by structural damage detection, the occurrence of
    momentous accident can be avoided, the harm degree of accident can be minished,
    and the great potential economy benefit and social benefit can be obtained.
     There are many kinds of structural damage detection method, but dynamic
    damage detection technology is prone to realize automatization and
    miniaturization of system, the foundation of its theory is abundant, the
    equipment to analyze and test is perfect, the detection result is nicety and
    credibility, and dynamic damage detection technology have many abilities, for
    example, real time, on line, remote test, controllability and convenience of
    picking up signal, so it is in dominant in engineering structural damage
    detection technology, it has wide use foreground in structural damage
    identification.
     There are many kinds of dynamic damage detection methods, there are three
    
    
    types of methods in common use: direct analytic method, time order analytic
    method and parameter recognition method. In these three methods, parameter
    recognition method recognizes the changes of modal parameter or physical
    parameter from metrical input and output signal directly, so it is convenient.
    From 1960s to this day, the dynamic damage detection technology based on modal
    analysis has been used widely. Detection method based on single modal parameter
    is relative common at present. But the dynamic damage detection based on
    recognition of modal parameter belongs to “inverse problem” in dynamics,
    “inverse problem” sometimes is not single and certain, so the detection result
    is likely to be not single, and the wrong detection occurs. So the synthetically
    detection technology based on multi-parameter rises, the research production
    of pattern recognition, artificial intelligence and expert system etc. infuses
    damage detection with fresh energy. In these methods, pattern recognition is
    an important embranchment of artificial intelligence, it is a leading direction
    in today’s development of damage detection technology to develop
    intelligentized technology by appliance of theory and technique of pattern
    recognition or artificial intelligence to structural damage detection.
     In this paper, cantilever is chosen as typical component, the theory and
    technique of pattern recognition is used to the dynamic detection technology
    based on modal analysis, damage pattern is established by damage information
    eigenvector from modal parameter, the structural damage position and extension
    are recognized respectively, consequently precision of detection is improved.
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