【摘要】：在路面工況中，多物理場耦合現(xiàn)象隨處可見，且耦合類型繁多，可分為強耦合和弱耦合兩種類型。場與場之間是何種耦合取決于實際的需要和現(xiàn)時的研究水平。熱彈耦合是一種典型的耦合現(xiàn)象，一般工況下路面結(jié)構(gòu)的應(yīng)力場與溫度場之間存在耦合關(guān)系，溫度場對應(yīng)力場的作用是強耦合，應(yīng)力場對溫度場的作用是弱耦合，且這種弱耦合可以忽略，二者屬于單向耦合；而特殊工況（熱沖擊）下路面結(jié)構(gòu)的應(yīng)力場對溫度場的弱耦合作用是不可忽略的，二者屬于雙向耦合。因此，針對弱耦合作用，系統(tǒng)地進行熱彈耦合效應(yīng)的預(yù)測、量化和評價是很有必要的。 本文針對熱彈耦合預(yù)測、量化與評價問題，以熱彈耦合效應(yīng)為研究對象，從理論推導(dǎo)和數(shù)值模擬兩個方面出發(fā)，，以熱彈性理論為基石，結(jié)合數(shù)值分析技術(shù)、數(shù)理統(tǒng)計技術(shù)及Matlab編程等方法，構(gòu)建熱彈耦合計算模型，通過Matlab編程實現(xiàn)其可視化，實現(xiàn)真正熱彈耦合效應(yīng)的量化。從理論推導(dǎo)著手，以時間尺度為分類依據(jù)，結(jié)合具體實例分析，提出熱彈耦合效應(yīng)（時刻耦合效應(yīng)及時段耦合效應(yīng)）的預(yù)測和評價方法，即以修正耦合系數(shù)和沖量耦合系數(shù)，作為事前預(yù)測指標，以相對差值百分比和相對沖量差值百分比，作為事后評價指標，并給出了典型工況下相關(guān)指標（沖量耦合系數(shù)及相對沖量差值百分比）的預(yù)測模型及規(guī)律性分析。此外，為了更好的預(yù)測沖量耦合系數(shù)，借鑒費爾哈斯對Malthusian模型修正的思想，并引入粒子群優(yōu)化算法，提出了修正費爾哈斯模型，結(jié)合實例證明了該模型預(yù)測精度得到了提高。 針對路面工況，本文提出了熱彈耦合效應(yīng)計算模型、預(yù)測指標、評價指標及典型工況耦合效應(yīng)預(yù)測模型，首次系統(tǒng)地對熱彈耦合效應(yīng)進行了研究，為路面工程多物理場耦合的深入研究提供了參考。
[Abstract]:In the pavement condition, the coupling phenomenon of multi-physical field can be seen everywhere, and there are many coupling types, which can be divided into two types: strong coupling and weak coupling. What kind of coupling between the field and the field depends on the actual needs and the current level of research. Thermoelastic coupling is a typical coupling phenomenon. There is a coupling relationship between the stress field and the temperature field of the pavement structure under general working conditions. The effect of the temperature field on the stress field is strong coupling, and the effect of the stress field on the temperature field is weak coupling. The weak coupling can be ignored, and the two belong to unidirectional coupling. However, the weak coupling effect of the stress field of the pavement structure on the temperature field under special working conditions (thermal shock) can not be ignored, and the two belong to bidirectional coupling. Therefore, it is necessary to systematically predict, quantify and evaluate the thermoelastic coupling effect for weak coupling. In this paper, aiming at the problems of thermoelastic coupling prediction, quantification and evaluation, taking the thermoelastic coupling effect as the research object, starting from two aspects of theoretical derivation and numerical simulation, taking thermoelastic theory as the cornerstone, combined with numerical analysis technology, By means of mathematical statistics technology and Matlab programming, the thermoelastic coupling calculation model is constructed, and its visualization is realized by Matlab programming, and the real thermoelastic coupling effect is quantified. Starting from the theoretical derivation, based on the classification of time scale and the analysis of concrete examples, the prediction and evaluation method of thermoelastic coupling effect (time coupling effect and time coupling effect) is put forward, that is, the modified coupling coefficient and impulse coupling coefficient are used to predict and evaluate the thermoelastic coupling effect. As an indicator of prior prediction, the percentage of relative difference and the percentage of relative impulse difference are used as the index of ex post facto evaluation. The prediction model and regularity analysis of the related indexes (impulse coupling coefficient and relative impulse difference percentage) under typical working conditions are given. In addition, in order to better predict impulse coupling coefficient, referring to Fairhaus' idea of modifying Malthusian model, and introducing particle swarm optimization algorithm, a modified Fairhaus model is proposed, and an example is given to prove that the prediction accuracy of the model is improved. In this paper, the calculation model, prediction index, evaluation index and typical working condition coupling effect prediction model of thermoelastic coupling effect are put forward, and the thermoelastic coupling effect is studied systematically for the first time. It provides a reference for the further study of multi-physical field coupling in pavement engineering.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.2

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