發(fā)布時(shí)間：2018-03-09 08:05

  本文選題：雙輥鑄軋　切入點(diǎn)：金屬熔池液位控制　出處：《遼寧科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：雙輥鑄軋是一種先進(jìn)的金屬薄板生產(chǎn)工藝,其特點(diǎn)是在生產(chǎn)過(guò)程中金屬結(jié)晶的同時(shí),完成金屬的軋制和塑形,這與傳統(tǒng)的熱軋工藝相比極大的簡(jiǎn)化了生產(chǎn)過(guò)程,降低了生產(chǎn)所需投資和能耗,同時(shí)提高了產(chǎn)品質(zhì)量,也使雙輥鑄軋技術(shù)在金屬成品制造領(lǐng)域中得到了廣泛的應(yīng)用。雙輥鑄軋技術(shù)生產(chǎn)的金屬薄板質(zhì)量與金屬的凝固點(diǎn)位置有密切的關(guān)系,生產(chǎn)過(guò)程中要求凝固點(diǎn)始終在鑄軋輥輥縫上方較近處形成,而金屬熔池液位對(duì)凝固點(diǎn)的形成產(chǎn)生直接影響。由于在雙輥鑄軋技術(shù)生產(chǎn)金屬薄板的過(guò)程中,熔融金屬凝固的速度極快,所以難以實(shí)現(xiàn)對(duì)輥速、輥縫、塞棒高度等相關(guān)工藝參數(shù)的人工檢測(cè)和控制,同時(shí)熔池液位控制的工藝參數(shù)間存在著強(qiáng)耦合關(guān)系,這些因素使控制過(guò)程產(chǎn)生了很強(qiáng)的非線性、滯后性和時(shí)變性特征。針對(duì)液位控制過(guò)程的局限性,本文提出采用以模糊數(shù)學(xué)和控制理論為基礎(chǔ)的模糊控制方法對(duì)其實(shí)現(xiàn)自動(dòng)化控制。但由于傳統(tǒng)模糊控制控制參數(shù)的確定極大地依賴(lài)于專(zhuān)家經(jīng)驗(yàn),這使得控制過(guò)程具有了主觀性和不確定性。針對(duì)模糊控制存在的問(wèn)題,本文進(jìn)一步提出了基于具有極強(qiáng)全局尋優(yōu)能力的遺傳算法對(duì)模糊控制參數(shù)進(jìn)行同步優(yōu)化,優(yōu)化對(duì)象包括:隸屬度函數(shù)參數(shù)、控制規(guī)則庫(kù)參數(shù)和模糊因子。同時(shí),由于遺傳算法本身存在“早熟”現(xiàn)象,所以在算法設(shè)計(jì)過(guò)程中采用自適應(yīng)策略修正遺傳算子,避免了遺傳算法自身存在的問(wèn)題。本文首先對(duì)雙輥鑄軋工藝原理進(jìn)行了介紹,并分析了熔池液位控制的意義,簡(jiǎn)述了液位控制的發(fā)展;在此基礎(chǔ)上,明確熔池液位基本結(jié)構(gòu),完成其數(shù)學(xué)模型的推導(dǎo),同時(shí)分析了各工藝參數(shù)對(duì)熔池液位的影響;然后對(duì)模糊控制技術(shù)進(jìn)行了研究,探討其優(yōu)點(diǎn)和局限性,結(jié)合實(shí)際液位控制情況確定傳統(tǒng)模糊控制參數(shù);最后詳細(xì)介紹了遺傳算法的基本流程,選擇實(shí)數(shù)編碼方法進(jìn)行編碼染色體,并完成個(gè)體適應(yīng)度函數(shù)和遺傳算子的設(shè)計(jì),同時(shí)實(shí)現(xiàn)了遺傳算子自適應(yīng)修正功能。通過(guò)MATLAB軟件仿真可證明,與傳統(tǒng)的模糊控制相比,基于自適應(yīng)遺傳算法改進(jìn)的模糊控制控制方法,其動(dòng)態(tài)性能有明顯提高,在對(duì)雙輥鑄軋機(jī)金屬熔池進(jìn)行控制具有了更高的精確性和穩(wěn)定性。
[Abstract]:Twin roll casting rolling is an advanced production process of sheet metal, which is characterized by the completion of metal rolling and shaping while the metal is crystallized in the production process, which greatly simplifies the production process compared with the traditional hot rolling process. It reduces the investment and energy consumption required for production and improves the quality of the product. The technology of two-roll casting and rolling has been widely used in the field of metal product manufacture. The quality of metal sheet produced by double-roll casting and rolling technology is closely related to the freezing point of metal. In the process of production, the freezing point should always be formed near the top of the roll gap, and the liquid level of the molten pool has a direct effect on the formation of the freezing point. The solidification speed of molten metal is very fast, so it is difficult to realize the manual detection and control of the relative technological parameters such as roll speed, roll gap, plug rod height and so on. At the same time, there is a strong coupling relationship among the process parameters of molten pool level control. These factors lead to very strong nonlinear, lag and time-varying characteristics of the control process. In this paper, a fuzzy control method based on fuzzy mathematics and control theory is proposed to realize automatic control. However, the determination of traditional fuzzy control parameters depends heavily on expert experience. This makes the control process subjective and uncertain. Aiming at the existing problems of fuzzy control, this paper proposes a genetic algorithm based on strong global optimization ability to synchronously optimize the fuzzy control parameters. The optimization objects include membership function parameter, control rule base parameter and fuzzy factor. At the same time, because genetic algorithm itself has "premature" phenomenon, adaptive strategy is used to modify genetic operator in the process of algorithm design. In this paper, the principle of twin-roll casting rolling process is introduced, and the significance of molten pool level control is analyzed, and the development of liquid level control is briefly described, based on which, the basic structure of molten pool level is clarified. At the same time, the influence of each process parameter on the molten pool level is analyzed, and then the fuzzy control technology is studied, its advantages and limitations are discussed, and the traditional fuzzy control parameters are determined in combination with the actual liquid level control. At last, the basic flow of genetic algorithm is introduced in detail. The real coding method is chosen to code chromosome, and the individual fitness function and genetic operator are designed. At the same time, the adaptive modification function of genetic operator is realized. The simulation of MATLAB software shows that compared with the traditional fuzzy control, the dynamic performance of the improved fuzzy control method based on adaptive genetic algorithm is obviously improved. It has higher accuracy and stability in controlling the molten pool of two-roll casting mill.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG334.9

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