基于工作模态参数的船用龙门.doc
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基于工作模态参数的船用龙门,摘要随着现代技术的飞速发展，现有的工程结构越来越复杂，对于结构的工况分析和结构损伤诊断问题研究显得非常迫切与重要。目前结构损伤诊断问题已经广泛应用于建筑、机械、航空、土木等工程领域。在研究理论的基础上，国内外学者更注重于将理论应用于工程实际，即研究结构在工作状态下，如何得到其结构的损伤情况，并采取相应的应对措施。本文就...
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摘要
随着现代技术的飞速发展，现有的工程结构越来越复杂，对于结构的工况分析和结构损伤诊断问题研究显得非常迫切与重要。目前结构损伤诊断问题已经广泛应用于建筑、机械、航空、土木等工程领域。在研究理论的基础上，国内外学者更注重于将理论应用于工程实际，即研究结构在工作状态下，如何得到其结构的损伤情况，并采取相应的应对措施。
本文就是在研究基于工作模态参数的参数识别基础上，完成了结构损伤诊断问题分析，建立一套可以应用到结构在线诊断和分析的理论体系。在此理论研究的基础上，将应用结构从土木和建筑行业拓展到机械行业，对船用龙门起重机的工作状态进行了分析，并针对起重机的主要承受工作载荷的主梁结构完成了结构损伤诊断研究，在特定的随机工况下，得出了主梁的损伤位置，并对损伤程度进行了判断。最后，以VB软件为平台，应用三维建模软件UG、数学分析软件MATLAB、有限元分析软件ANSYS等建立了基于工作模态参数的结构损伤诊断原型系统。
本文主要完成了以下几个方面的研究：
（1）简要阐述了结构模态分析理论，并分别从结构承受简谐载荷和随机载荷两个方面具体分析了结构模态参数识别的方法；针对具体的承受随机风载荷的桁架结构进行了具体实例分析，对用ITD方法得出的模态参数和有限元软件得出的参数进行对比分析，验证了上述应用于随机载荷的模态参数识别方法是可行的。
（2）系统地分析了结构损伤指标法，并针对结构承受随机载荷的特性，提出了利用结构模型修正方法进行结构损伤诊断；重点研究讨论人工智能方法BP神经网络法和遗传算法在损伤诊断中的应用。
（3）详细分析了结构模态参数、振动响应与损伤的关系，并对具体的模态参数进行了损伤敏感性分析，提出了适用于结构随机载荷工况的随机振动位移方差模型修正损伤诊断方法。
（4）针对具体的实例船用龙门起重机，在完成了其工况分析，载荷组合理论的基础上，分别利用三维软件建模和参数化建模两种方式完成了船用起重机的模型建立，并利用模态参数损伤理论完成了主梁的损伤诊断研究。
（5）以模态参数损伤诊断流程为导向，开发了基于模态参数结构损伤诊断原型系统（SMDD），并应用于船用龙门起重机主梁的结构损伤诊断。
关键词 工作模态；模态参数；结构损伤诊断；船用龙门起重机
Abstract
With the rapid development of modern technology, the existing engineering structures more complex, conditions for the structure analysis, structural damage detection problem is very urgent and important. Structural damage detection problem is now widely used in construction, machinery, aviation, civil and other engineering fields。Based on the theory in the study, domestic and foreign scholars to focus more on the theory used in engineering practice, that structure in working condition, how to get the structure of the damage and take corresponding measures.
This article is based on work in the study of the parameter identification of modal parameters based on the completion of structural damage detection, problem analysis, aims to establish a complete structure which can be applied to the analysis of online diagnosis and comprehensive theory. In theory, based on the application structure from the civil and construction industry expanded to machinery industry, the work on the state of marine gantry cranes were analyzed, and the main crane girder to withstand the work load of the structure completed the diagnosis of structural damage in specific random conditions, come to the main beam of the damage location, damage judgments. Finally, VB software platform, use mathematical analysis software MATLAB, finite element analysis software ANSYS, and three-dimensional modeling software UG，to establish the modal parameters based on the work of the prototype structure damage detection.
In this paper, complete the following aspects:
(1) Briefly describes the theory of modal analysis and harmonic, respectively, from the structure to withstand both random and specific analysis of random loading of structural modal parameter identification method; and for concrete subjected to random wind load of truss structure of a specific case study on the use of ITD-derived modal parameters and software parameters obtained were analyzed to verify the above analysis applies to random loading identification of modal parameters is feasible.
(2) A systematic analysis of the structural damage index method and for the characteristics of the structure subjected to random loading is proposed structural model updating methods using structural damage detection; focus on the discussion of artificial intelligence BP neural network and genetic algorithm in damage detection application.
(3) Detailed analysis of the structural modal parameters of the relationship between vibration and injury, and the specific damage modal parameters sensitivity analysis, the structure proposed for random loading conditions of the variance of random displacement vibration damage detection methods.
(4) Specific examples of ship gantry cranes, completed its work in the situation analysis, portfolio theory based on the load, respectively, using three-dimensional modeling software and the parameters are two ways to complete the crane model and use of modal parameters completion of the main beam damage theory of damage diagnosis.
(5) Modal damage detection process-oriented parameters, the development ..
随着现代技术的飞速发展，现有的工程结构越来越复杂，对于结构的工况分析和结构损伤诊断问题研究显得非常迫切与重要。目前结构损伤诊断问题已经广泛应用于建筑、机械、航空、土木等工程领域。在研究理论的基础上，国内外学者更注重于将理论应用于工程实际，即研究结构在工作状态下，如何得到其结构的损伤情况，并采取相应的应对措施。
本文就是在研究基于工作模态参数的参数识别基础上，完成了结构损伤诊断问题分析，建立一套可以应用到结构在线诊断和分析的理论体系。在此理论研究的基础上，将应用结构从土木和建筑行业拓展到机械行业，对船用龙门起重机的工作状态进行了分析，并针对起重机的主要承受工作载荷的主梁结构完成了结构损伤诊断研究，在特定的随机工况下，得出了主梁的损伤位置，并对损伤程度进行了判断。最后，以VB软件为平台，应用三维建模软件UG、数学分析软件MATLAB、有限元分析软件ANSYS等建立了基于工作模态参数的结构损伤诊断原型系统。
本文主要完成了以下几个方面的研究：
（1）简要阐述了结构模态分析理论，并分别从结构承受简谐载荷和随机载荷两个方面具体分析了结构模态参数识别的方法；针对具体的承受随机风载荷的桁架结构进行了具体实例分析，对用ITD方法得出的模态参数和有限元软件得出的参数进行对比分析，验证了上述应用于随机载荷的模态参数识别方法是可行的。
（2）系统地分析了结构损伤指标法，并针对结构承受随机载荷的特性，提出了利用结构模型修正方法进行结构损伤诊断；重点研究讨论人工智能方法BP神经网络法和遗传算法在损伤诊断中的应用。
（3）详细分析了结构模态参数、振动响应与损伤的关系，并对具体的模态参数进行了损伤敏感性分析，提出了适用于结构随机载荷工况的随机振动位移方差模型修正损伤诊断方法。
（4）针对具体的实例船用龙门起重机，在完成了其工况分析，载荷组合理论的基础上，分别利用三维软件建模和参数化建模两种方式完成了船用起重机的模型建立，并利用模态参数损伤理论完成了主梁的损伤诊断研究。
（5）以模态参数损伤诊断流程为导向，开发了基于模态参数结构损伤诊断原型系统（SMDD），并应用于船用龙门起重机主梁的结构损伤诊断。
关键词 工作模态；模态参数；结构损伤诊断；船用龙门起重机
Abstract
With the rapid development of modern technology, the existing engineering structures more complex, conditions for the structure analysis, structural damage detection problem is very urgent and important. Structural damage detection problem is now widely used in construction, machinery, aviation, civil and other engineering fields。Based on the theory in the study, domestic and foreign scholars to focus more on the theory used in engineering practice, that structure in working condition, how to get the structure of the damage and take corresponding measures.
This article is based on work in the study of the parameter identification of modal parameters based on the completion of structural damage detection, problem analysis, aims to establish a complete structure which can be applied to the analysis of online diagnosis and comprehensive theory. In theory, based on the application structure from the civil and construction industry expanded to machinery industry, the work on the state of marine gantry cranes were analyzed, and the main crane girder to withstand the work load of the structure completed the diagnosis of structural damage in specific random conditions, come to the main beam of the damage location, damage judgments. Finally, VB software platform, use mathematical analysis software MATLAB, finite element analysis software ANSYS, and three-dimensional modeling software UG，to establish the modal parameters based on the work of the prototype structure damage detection.
In this paper, complete the following aspects:
(1) Briefly describes the theory of modal analysis and harmonic, respectively, from the structure to withstand both random and specific analysis of random loading of structural modal parameter identification method; and for concrete subjected to random wind load of truss structure of a specific case study on the use of ITD-derived modal parameters and software parameters obtained were analyzed to verify the above analysis applies to random loading identification of modal parameters is feasible.
(2) A systematic analysis of the structural damage index method and for the characteristics of the structure subjected to random loading is proposed structural model updating methods using structural damage detection; focus on the discussion of artificial intelligence BP neural network and genetic algorithm in damage detection application.
(3) Detailed analysis of the structural modal parameters of the relationship between vibration and injury, and the specific damage modal parameters sensitivity analysis, the structure proposed for random loading conditions of the variance of random displacement vibration damage detection methods.
(4) Specific examples of ship gantry cranes, completed its work in the situation analysis, portfolio theory based on the load, respectively, using three-dimensional modeling software and the parameters are two ways to complete the crane model and use of modal parameters completion of the main beam damage theory of damage diagnosis.
(5) Modal damage detection process-oriented parameters, the development ..
