基于工作模態(tài)參數(shù)的船用龍門.doc
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基于工作模態(tài)參數(shù)的船用龍門,摘要隨著現(xiàn)代技術(shù)的飛速發(fā)展，現(xiàn)有的工程結(jié)構(gòu)越來越復(fù)雜，對于結(jié)構(gòu)的工況分析和結(jié)構(gòu)損傷診斷問題研究顯得非常迫切與重要。目前結(jié)構(gòu)損傷診斷問題已經(jīng)廣泛應(yīng)用于建筑、機(jī)械、航空、土木等工程領(lǐng)域。在研究理論的基礎(chǔ)上，國內(nèi)外學(xué)者更注重于將理論應(yīng)用于工程實(shí)際，即研究結(jié)構(gòu)在工作狀態(tài)下，如何得到其結(jié)構(gòu)的損傷情況，并采取相應(yīng)的應(yīng)對措施。本文就...
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摘要
隨著現(xiàn)代技術(shù)的飛速發(fā)展，現(xiàn)有的工程結(jié)構(gòu)越來越復(fù)雜，對于結(jié)構(gòu)的工況分析和結(jié)構(gòu)損傷診斷問題研究顯得非常迫切與重要。目前結(jié)構(gòu)損傷診斷問題已經(jīng)廣泛應(yīng)用于建筑、機(jī)械、航空、土木等工程領(lǐng)域。在研究理論的基礎(chǔ)上，國內(nèi)外學(xué)者更注重于將理論應(yīng)用于工程實(shí)際，即研究結(jié)構(gòu)在工作狀態(tài)下，如何得到其結(jié)構(gòu)的損傷情況，并采取相應(yīng)的應(yīng)對措施。
本文就是在研究基于工作模態(tài)參數(shù)的參數(shù)識別基礎(chǔ)上，完成了結(jié)構(gòu)損傷診斷問題分析，建立一套可以應(yīng)用到結(jié)構(gòu)在線診斷和分析的理論體系。在此理論研究的基礎(chǔ)上，將應(yīng)用結(jié)構(gòu)從土木和建筑行業(yè)拓展到機(jī)械行業(yè)，對船用龍門起重機(jī)的工作狀態(tài)進(jìn)行了分析，并針對起重機(jī)的主要承受工作載荷的主梁結(jié)構(gòu)完成了結(jié)構(gòu)損傷診斷研究，在特定的隨機(jī)工況下，得出了主梁的損傷位置，并對損傷程度進(jìn)行了判斷。最后，以VB軟件為平臺，應(yīng)用三維建模軟件UG、數(shù)學(xué)分析軟件MATLAB、有限元分析軟件ANSYS等建立了基于工作模態(tài)參數(shù)的結(jié)構(gòu)損傷診斷原型系統(tǒng)。
本文主要完成了以下幾個方面的研究：
（1）簡要闡述了結(jié)構(gòu)模態(tài)分析理論，并分別從結(jié)構(gòu)承受簡諧載荷和隨機(jī)載荷兩個方面具體分析了結(jié)構(gòu)模態(tài)參數(shù)識別的方法；針對具體的承受隨機(jī)風(fēng)載荷的桁架結(jié)構(gòu)進(jìn)行了具體實(shí)例分析，對用ITD方法得出的模態(tài)參數(shù)和有限元軟件得出的參數(shù)進(jìn)行對比分析，驗(yàn)證了上述應(yīng)用于隨機(jī)載荷的模態(tài)參數(shù)識別方法是可行的。
（2）系統(tǒng)地分析了結(jié)構(gòu)損傷指標(biāo)法，并針對結(jié)構(gòu)承受隨機(jī)載荷的特性，提出了利用結(jié)構(gòu)模型修正方法進(jìn)行結(jié)構(gòu)損傷診斷；重點(diǎn)研究討論人工智能方法BP神經(jīng)網(wǎng)絡(luò)法和遺傳算法在損傷診斷中的應(yīng)用。
（3）詳細(xì)分析了結(jié)構(gòu)模態(tài)參數(shù)、振動響應(yīng)與損傷的關(guān)系，并對具體的模態(tài)參數(shù)進(jìn)行了損傷敏感性分析，提出了適用于結(jié)構(gòu)隨機(jī)載荷工況的隨機(jī)振動位移方差模型修正損傷診斷方法。
（4）針對具體的實(shí)例船用龍門起重機(jī)，在完成了其工況分析，載荷組合理論的基礎(chǔ)上，分別利用三維軟件建模和參數(shù)化建模兩種方式完成了船用起重機(jī)的模型建立，并利用模態(tài)參數(shù)損傷理論完成了主梁的損傷診斷研究。
（5）以模態(tài)參數(shù)損傷診斷流程為導(dǎo)向，開發(fā)了基于模態(tài)參數(shù)結(jié)構(gòu)損傷診斷原型系統(tǒng)（SMDD），并應(yīng)用于船用龍門起重機(jī)主梁的結(jié)構(gòu)損傷診斷。
關(guān)鍵詞 工作模態(tài)；模態(tài)參數(shù)；結(jié)構(gòu)損傷診斷；船用龍門起重機(jī)
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 ..
隨著現(xiàn)代技術(shù)的飛速發(fā)展，現(xiàn)有的工程結(jié)構(gòu)越來越復(fù)雜，對于結(jié)構(gòu)的工況分析和結(jié)構(gòu)損傷診斷問題研究顯得非常迫切與重要。目前結(jié)構(gòu)損傷診斷問題已經(jīng)廣泛應(yīng)用于建筑、機(jī)械、航空、土木等工程領(lǐng)域。在研究理論的基礎(chǔ)上，國內(nèi)外學(xué)者更注重于將理論應(yīng)用于工程實(shí)際，即研究結(jié)構(gòu)在工作狀態(tài)下，如何得到其結(jié)構(gòu)的損傷情況，并采取相應(yīng)的應(yīng)對措施。
本文就是在研究基于工作模態(tài)參數(shù)的參數(shù)識別基礎(chǔ)上，完成了結(jié)構(gòu)損傷診斷問題分析，建立一套可以應(yīng)用到結(jié)構(gòu)在線診斷和分析的理論體系。在此理論研究的基礎(chǔ)上，將應(yīng)用結(jié)構(gòu)從土木和建筑行業(yè)拓展到機(jī)械行業(yè)，對船用龍門起重機(jī)的工作狀態(tài)進(jìn)行了分析，并針對起重機(jī)的主要承受工作載荷的主梁結(jié)構(gòu)完成了結(jié)構(gòu)損傷診斷研究，在特定的隨機(jī)工況下，得出了主梁的損傷位置，并對損傷程度進(jìn)行了判斷。最后，以VB軟件為平臺，應(yīng)用三維建模軟件UG、數(shù)學(xué)分析軟件MATLAB、有限元分析軟件ANSYS等建立了基于工作模態(tài)參數(shù)的結(jié)構(gòu)損傷診斷原型系統(tǒng)。
本文主要完成了以下幾個方面的研究：
（1）簡要闡述了結(jié)構(gòu)模態(tài)分析理論，并分別從結(jié)構(gòu)承受簡諧載荷和隨機(jī)載荷兩個方面具體分析了結(jié)構(gòu)模態(tài)參數(shù)識別的方法；針對具體的承受隨機(jī)風(fēng)載荷的桁架結(jié)構(gòu)進(jìn)行了具體實(shí)例分析，對用ITD方法得出的模態(tài)參數(shù)和有限元軟件得出的參數(shù)進(jìn)行對比分析，驗(yàn)證了上述應(yīng)用于隨機(jī)載荷的模態(tài)參數(shù)識別方法是可行的。
（2）系統(tǒng)地分析了結(jié)構(gòu)損傷指標(biāo)法，并針對結(jié)構(gòu)承受隨機(jī)載荷的特性，提出了利用結(jié)構(gòu)模型修正方法進(jìn)行結(jié)構(gòu)損傷診斷；重點(diǎn)研究討論人工智能方法BP神經(jīng)網(wǎng)絡(luò)法和遺傳算法在損傷診斷中的應(yīng)用。
（3）詳細(xì)分析了結(jié)構(gòu)模態(tài)參數(shù)、振動響應(yīng)與損傷的關(guān)系，并對具體的模態(tài)參數(shù)進(jìn)行了損傷敏感性分析，提出了適用于結(jié)構(gòu)隨機(jī)載荷工況的隨機(jī)振動位移方差模型修正損傷診斷方法。
（4）針對具體的實(shí)例船用龍門起重機(jī)，在完成了其工況分析，載荷組合理論的基礎(chǔ)上，分別利用三維軟件建模和參數(shù)化建模兩種方式完成了船用起重機(jī)的模型建立，并利用模態(tài)參數(shù)損傷理論完成了主梁的損傷診斷研究。
（5）以模態(tài)參數(shù)損傷診斷流程為導(dǎo)向，開發(fā)了基于模態(tài)參數(shù)結(jié)構(gòu)損傷診斷原型系統(tǒng)（SMDD），并應(yīng)用于船用龍門起重機(jī)主梁的結(jié)構(gòu)損傷診斷。
關(guān)鍵詞 工作模態(tài)；模態(tài)參數(shù)；結(jié)構(gòu)損傷診斷；船用龍門起重機(jī)
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 ..
