本文選題：冷連軋 + 過程控制�。� 參考：《東北大學(xué)》2014年博士論文

【摘要】：過程控制系統(tǒng)是冷連軋計算機(jī)控制系統(tǒng)的重要組成部分,是保證冷軋帶鋼產(chǎn)品質(zhì)量和生產(chǎn)效率的主要控制手段。本文以某冷軋薄板科技有限公司1450mm五機(jī)架冷連軋機(jī)組的建設(shè)項目為背景,對冷連軋過程控制系統(tǒng)的結(jié)構(gòu)框架及功能、冷連軋在線數(shù)學(xué)模型、數(shù)學(xué)模型的優(yōu)化算法和軋制規(guī)程的制定等內(nèi)容進(jìn)行了研究,開發(fā)了冷連軋過程控制系統(tǒng)程序并將其應(yīng)用于冷連軋現(xiàn)場,取得了良好的應(yīng)用效果。本文的主要研究內(nèi)容如下：(1)開發(fā)了冷連軋過程控制系統(tǒng)。結(jié)合冷連軋具體控制和工藝要求,設(shè)計了過程控制系統(tǒng)的框架結(jié)構(gòu)、數(shù)據(jù)流程和觸發(fā)邏輯,開發(fā)了過程控制系統(tǒng)的數(shù)據(jù)通訊、數(shù)據(jù)管理、鋼卷跟蹤、模型設(shè)定及模型自適應(yīng)等功能模塊。(2)基于數(shù)值積分的思想,建立了帶鋼塑性變形的微單元離散模型。通過對變形區(qū)微單元的力學(xué)分析,推導(dǎo)了軋制應(yīng)力分布的數(shù)值計算公式,并通過對變形區(qū)各微單元積分求和的方式建立了軋制力、軋制力矩及軋制功率等參數(shù)的計算公式。針對軋制力和軋輥壓扁半徑的耦合現(xiàn)象,給出了軋制力能參數(shù)在線模型的計算流程和迭代算法,分析了變形區(qū)的壓力分布,并驗證了模型的準(zhǔn)確性。為提高在線模型的預(yù)報精度,開發(fā)了一種基于現(xiàn)場測試的電機(jī)機(jī)械功率損耗和軋機(jī)彈跳在線計算模型,并根據(jù)現(xiàn)場實(shí)際測試數(shù)據(jù),回歸得到了電機(jī)機(jī)械功率損耗和軋機(jī)彈跳模型中的系數(shù)。(3)針對模型自適應(yīng)指數(shù)平滑算法中難以用固定增益系數(shù)適應(yīng)軋制狀況變化的問題,提出了一種根據(jù)實(shí)測數(shù)據(jù)動態(tài)調(diào)整增益系數(shù)的方法,并應(yīng)用于軋制力、功率、輥縫設(shè)定和前滑等模型的自適應(yīng)算法中。為提高軋制力模型的預(yù)報精度,提出了種基于同標(biāo)函數(shù)的軋制力模型參數(shù)尋優(yōu)方法,該方法通過建立軋制力模型參數(shù)自適應(yīng)目標(biāo)函數(shù),以變形抗力和摩擦系數(shù)模型中的自適應(yīng)系數(shù)作為尋優(yōu)參數(shù),采削優(yōu)化算法對目標(biāo)函數(shù)進(jìn)行求解從而可獲得滿足軋制力精度的模型自適應(yīng)系數(shù)。(4)基于產(chǎn)量最大化、產(chǎn)品質(zhì)量最優(yōu)等目標(biāo),設(shè)計了一種新的軋制規(guī)程多目標(biāo)優(yōu)化算法,通過在目標(biāo)函數(shù)中引入函數(shù)懲罰項,將多目標(biāo)函數(shù)約束求解問題轉(zhuǎn)化為無約束求解問題。在建立軋制力、板形、電機(jī)功率、壓下率、張力等單目標(biāo)函數(shù)的基礎(chǔ)上,建立了基于罰函數(shù)的綜合多目標(biāo)函數(shù),并采用單純形算法進(jìn)行求解得到最優(yōu)解,即各中間機(jī)架的厚度和張力值�；诙嗄繕�(biāo)的優(yōu)化算法,使軋制規(guī)程的制定擺脫了對冷軋負(fù)荷分配經(jīng)驗值的依賴。(5)根據(jù)現(xiàn)場實(shí)測數(shù)據(jù),分析了過程控制系統(tǒng)中關(guān)鍵工藝模型和軋制規(guī)程優(yōu)化策略的在線使用效果,對控制系統(tǒng)的效果作出了有說服力的評價。本文的研究內(nèi)容,面向冷連軋過程在線控制,具有很強(qiáng)的實(shí)用性。目前,已將開發(fā)的冷連軋過程控制與模型設(shè)定系統(tǒng)成功應(yīng)用于某1450mm冷連軋生產(chǎn)線,這對于開發(fā)我國具有自主知識產(chǎn)權(quán)的冷連軋過程控制系統(tǒng)具有重要意義。
[Abstract]:The process control system is an important part of the cold rolling mill computer control system. It is the main control means to ensure the quality and production efficiency of the cold rolled strip. In this paper, the structure and function of the cold rolling process control system are cooled on the background of the construction project of the cold rolling mill of a cold rolled sheet technology limited company 1450mm five stand cold rolling mill. The on-line mathematical model of continuous rolling, the optimization algorithm of mathematical model and the formulation of rolling regulations have been studied. The program of the control system of cold continuous rolling process is developed and applied to the cold continuous rolling field. The main research contents of this paper are as follows: (1) the control system of cold continuous rolling process is developed and combined with cold continuous rolling. Specific control and process requirements, the framework of the process control system, data flow and trigger logic are designed, and data communication, data management, steel coil tracking, model setting and model adaptive modules are developed. (2) based on the idea of numerical integration, a discrete element model with steel plastic deformation is established. Through the mechanical analysis of the microelement in the deformation zone, the numerical calculation formula of the rolling stress distribution is derived, and the calculation formulas of rolling force, rolling torque and rolling power are established by the method of calculating the integral of each microelement in the deformation zone. The rolling force and the roll squash radius are coupled to give the rolling force energy parameters. The calculation flow and iterative algorithm of the line model are used to analyze the pressure distribution in the deformation zone and verify the accuracy of the model. In order to improve the prediction accuracy of the on-line model, an on-line calculation model of motor power loss and rolling mill jumping is developed based on the field test, and the motor machinery is regressed according to the actual test data on the spot. The coefficients in the power loss and the rolling mill jump model. (3) a method of dynamically adjusting the gain coefficient according to the measured data is proposed to adapt to the change of the rolling condition in the adaptive exponential smoothing algorithm of the model adaptive exponential smoothing algorithm. The method is applied to the adaptive algorithm of rolling force, work rate, roll gap setting and forward slip model. In order to improve the prediction accuracy of the rolling force model, a method of optimizing the parameters of rolling force model based on the same standard function is proposed. By establishing the adaptive target function of the parameters of the rolling force model, the adaptive coefficient in the model of deformation resistance and friction coefficient is used as the optimization parameter, and the optimization algorithm of mining is used to solve the target function. The model adaptive coefficient can be obtained to satisfy the rolling force precision. (4) a new multi-objective optimization algorithm for rolling regulation is designed based on the maximization of production and the best product quality. By introducing the function penalty item in the objective function, the multi objective function constraint solving question is transformed into unconstrained solution problem. The rolling force and plate are established. On the basis of the single objective function such as shape, motor power, compression rate and tension, a comprehensive multi-objective function based on penalty function is established, and the optimal solution is obtained by simplex algorithm, that is, the thickness and tension value of each intermediate frame. Based on the multi-objective optimization algorithm, the rolling regulation is made out of the experience value of the cold rolling load distribution. (5) according to the field measured data, the online use effect of the key process model and the rolling regulation optimization strategy in the process control system is analyzed. The effect of the control system is persuasively evaluated. The research content of this paper is oriented to the cold continuous rolling process on-line control, which is very practical. At present, the cold connection has been developed. Set the system successfully applied to the production line of a 1450mm cold rolling process control and model, which has important significance for the development of cold rolling process in China with independent intellectual property rights of the control system.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TG335.12
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本文編號：2045290