本文選題：結(jié)構(gòu)損傷檢測 + 相空間重構(gòu)　； 參考：《暨南大學(xué)》2014年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)的快速發(fā)展，各類現(xiàn)代化的大型、復(fù)雜橋梁結(jié)構(gòu)發(fā)展迅速。然而，復(fù)雜的服役環(huán)境使結(jié)構(gòu)的運(yùn)行安全日益遭受潛在的威脅，大型復(fù)雜結(jié)構(gòu)一旦發(fā)生事故，所帶來的損失和影響都是驚人的。因此對結(jié)構(gòu)的健康狀況進(jìn)行適時(shí)的評估變得尤為重要。 傳統(tǒng)的基于模態(tài)的損傷檢測方法存在著許多缺點(diǎn)和不足，如需要較密集的測點(diǎn)，，較低的識別精度等。本文就目前橋梁結(jié)構(gòu)健康監(jiān)測和損傷檢測所面臨的問題和挑戰(zhàn)進(jìn)行討論和研究，對Hilbert-Huang變換（HHT）和相空間重構(gòu)方法單測點(diǎn)損傷識別進(jìn)行深入的研究。通過結(jié)合理論推導(dǎo)和數(shù)值模擬分析，HHT和相空間重構(gòu)方法在橋梁損傷識別中的優(yōu)越性得到證實(shí)。文中主要以下從三方面著手討論： 1.首先介紹了橋梁結(jié)構(gòu)損傷檢測的重要意義。通過介紹該領(lǐng)域的發(fā)展現(xiàn)狀，概括性敘述了傳統(tǒng)方法在應(yīng)用中遇到的問題及不足之處。針對這些不足之處，本文引入移動荷載作用下HHT和相空間重構(gòu)的損傷檢測方法，并詳細(xì)敘述了這兩種方法的發(fā)展?fàn)顩r。 2.理論部分：介紹了HHT方法的計(jì)算過程，并將該過程應(yīng)用于歐拉-貝努利簡支梁模型的振動解析表達(dá)式中，以討論該方法損傷識別原理。同時(shí)也介紹了相空間重構(gòu)方法的參數(shù)（延遲時(shí)間和嵌入維數(shù)）的選取，以及相空間重構(gòu)方法的損傷識別原理。研究表明，這兩種方法通過單測點(diǎn)能夠識別出梁結(jié)構(gòu)的損傷位置。 3.模擬和實(shí)驗(yàn)部分：首先將簡支梁模型用于驗(yàn)證方法的可行性，并給出數(shù)值模擬中各種參數(shù)（荷載速度，損傷位置，程度等）對識別結(jié)果的影響，以初步研究這兩種方法在損傷識別中的應(yīng)用。進(jìn)而通過海珠橋模型進(jìn)行荷載參數(shù)和不同工況的研究，以進(jìn)一步研究文中方法在復(fù)雜結(jié)構(gòu)損傷檢測中的適用性。結(jié)果表明，文中方法在這兩種模型中都能很好的定位損傷，而且對損傷都具有較高的敏感性；兩種方法的定性比較看出，相空間重構(gòu)方法能更高效、更穩(wěn)定的識別損傷狀態(tài)。在海珠橋模型的初步實(shí)驗(yàn)研究表明，兩種方法都能通過指標(biāo)的最大值識別出損傷，同時(shí)對損傷的靈敏度都有所下降；荷載大小、速度等因素對識別結(jié)果的影響規(guī)律和模擬結(jié)果一致。
[Abstract]:With the rapid development of China's economy, various modern large-scale, complex bridge structures are developing rapidly. However, the complex service environment makes the operation safety of the structure suffer the potential threat day by day, once the large-scale complex structure has the accident, the loss and the influence are all astonishing. Therefore, timely assessment of the health status of the structure becomes particularly important. The traditional modal based damage detection method has many shortcomings, such as the need for more dense measuring points, low recognition accuracy and so on. In this paper, the problems and challenges of bridge structure health monitoring and damage detection are discussed and studied. The Hilbert-Huang transform (HHT) and phase space reconstruction method for single point damage identification are deeply studied. The advantages of HHT and phase space reconstruction in bridge damage identification have been proved by theoretical derivation and numerical simulation. The main contents are as follows: 1. At first, the importance of damage detection of bridge structure is introduced. By introducing the development of this field, the problems and shortcomings of traditional methods in application are described. In view of these shortcomings, the damage detection method of HHT and phase space reconstruction under moving load is introduced in this paper, and the development of these two methods is described in detail. 2. Theoretical part: the calculation process of HHT method is introduced and applied to the vibration analytical expression of Euler-Bernoulli simply supported beam model to discuss the damage identification principle of this method. At the same time, the selection of the parameters (delay time and embedding dimension) of the phase space reconstruction method and the damage identification principle of the phase space reconstruction method are also introduced. The results show that the two methods can identify the damage position of the beam structure by a single measuring point. 3. 3. Simulation and experiment: firstly, the simply supported beam model is used to verify the feasibility of the method, and the influence of various parameters (load velocity, damage location, degree, etc.) on the identification results in numerical simulation is given. The application of these two methods in damage identification is studied preliminarily. Then the load parameters and different working conditions of Haizhu Bridge model are studied to further study the applicability of this method in the damage detection of complex structures. The results show that the proposed method can locate the damage well in both models and has a high sensitivity to the damage, and the qualitative comparison of the two methods shows that the phase space reconstruction method can identify the damage state more efficiently and stably. The preliminary experimental study on the Haizhu Bridge model shows that both methods can identify the damage by the maximum value of the index, and the sensitivity of the damage is decreased. The effect of velocity and other factors on the recognition results is consistent with the simulation results.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U446

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