本文關(guān)鍵詞：基于輥系剛?cè)狁詈咸匦缘陌鍘к垯C系統(tǒng)動力學(xué)建模研究　出處：《燕山大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 板帶軋機 軋機輥系 運動板帶 耦合振動模型 剛?cè)狁詈蟿恿W(xué)模型

【摘要】：金屬板帶在國民經(jīng)濟和國防現(xiàn)代化建設(shè)中起著非常重要的作用。軋制過程是一個典型的復(fù)雜非線性動態(tài)過程,其動力學(xué)特性是由軋機輥系和運動板帶的不同物理屬性的運動通過相互耦合作用而決定的。本文以四輥熱連軋機組為研究對象,通過分析軋制過程中輥系、板帶的運動特征及其耦合關(guān)系,揭示基于輥系剛?cè)狁詈咸匦缘陌鍘к垯C系統(tǒng)動力學(xué)機理,建立相應(yīng)動力學(xué)模型,并在此基礎(chǔ)上進行仿真分析。綜合考慮輥系的垂直運動、水平運動、軋輥的轉(zhuǎn)動以及板帶剛性運動和彈性變形,通過動力學(xué)分析,實現(xiàn)柔性多體機械系統(tǒng)中剛體和可變形體位移場的描述,進而確定由于系統(tǒng)構(gòu)件剛性運動與彈性變形同時作用引起的強非線性慣性耦合與剛度耦合作用規(guī)律,建立板帶軋機輥系剛性振動耦合動力學(xué)機理模型,分析耦合作用下輥系的動態(tài)響應(yīng)和軋機工作穩(wěn)定性,為實現(xiàn)軋件厚度動態(tài)控制提供理論依據(jù)。充分考慮軋制過程中軋機系統(tǒng)剛性振動對軋輥彎曲變形動特性的影響。通過運動學(xué)分析,實現(xiàn)柔性多體機械系統(tǒng)中剛體和可變形體的位移場描述,建立板帶軋機輥系剛?cè)狁詈蟿恿W(xué)模型。對軋機輥系進行耦合運動模態(tài)分析,進一步探討軋輥變形運動振動頻率和模態(tài)振型函數(shù)的解析解,并比較不同時刻下,由傳統(tǒng)結(jié)構(gòu)動力學(xué)求得的軋輥固有模態(tài)振型函數(shù)與考慮軋機系統(tǒng)剛性振動時的軋輥模態(tài)振型函數(shù)的區(qū)別�？紤]軋制過程中軋輥運動與軋制變形區(qū)動特性的耦合作用規(guī)律,通過運動學(xué)分析,實現(xiàn)輥系-軋件動力學(xué)系統(tǒng)的位移場描述,建立板帶軋機輥系-軋件多參數(shù)耦合動力學(xué)模型。對軋機輥系進行耦合運動模態(tài)分析,進一步探討軋輥變形模態(tài)振型函數(shù)的解析解,并分析變形區(qū)內(nèi)金屬橫向流動位移的運動特征。建立基于輥系剛?cè)狁詈咸匦缘陌鍘к垯C系統(tǒng)動力學(xué)仿真模型,包括以下幾方面:軋機輥系剛性振動耦合動力學(xué)模型、軋機輥系剛?cè)狁詈蟿恿W(xué)模型、軋制變形區(qū)耦合動力學(xué)模型。同時考慮工作輥沿垂直和水平方向的運動特征,對變形區(qū)軋制力學(xué)模型進行了修正。由于軋輥橫向模態(tài)函數(shù)隨輥系剛性運動而時刻變化,基于模型本身特點,選取了中心差分法對系統(tǒng)進行仿真計算。從而得到基于輥系剛?cè)狁詈咸匦缘陌鍘к垯C系統(tǒng)動力學(xué)模型,并進行了仿真分析。該模型可對軋制過程進行模擬,能反映板形板厚綜合動態(tài)信息,為虛擬軋制提供理論基礎(chǔ),并為先進控制理論應(yīng)用提供平臺。本文從物理、力學(xué)特性的角度出發(fā),結(jié)合軋件-輥系耦合非均勻變形,真實的反映出軋機輥系和金屬板帶動態(tài)特性,揭示了軋制過程中軋制穩(wěn)定性、帶鋼表面振紋、咬鋼拋鋼等動態(tài)過程的產(chǎn)生機理。耦合動力學(xué)機理模型對推動軋機系統(tǒng)動態(tài)建模的發(fā)展,提高軋制過程控制精度具有重要理論和實用價值。
[Abstract]:Metal strip plays a very important role in national economy and national defense modernization. Rolling process is a typical complex nonlinear dynamic process. Its dynamic characteristics are determined by the interaction between the motion of different physical properties of the rolling mill roll system and the moving plate strip. This paper takes the four-high hot strip mill as the research object and analyzes the roll system during the rolling process. The motion characteristics of plate and strip and its coupling relationship reveal the dynamic mechanism of strip rolling mill system based on roll system rigid-flexible coupling characteristics and establish the corresponding dynamic model. On the basis of the simulation analysis, the vertical motion, horizontal movement, roll rotation, rigid motion and elastic deformation of the strip were considered synthetically, and the dynamic analysis was carried out. The displacement field of rigid body and variable body in flexible multi-body mechanical system is described, and the law of strong nonlinear inertial coupling and stiffness coupling caused by the simultaneous action of rigid motion and elastic deformation of the system member is determined. The dynamic mechanism model of rigid vibration coupling of roll system of strip mill is established, and the dynamic response of roll system and the working stability of rolling mill under coupling action are analyzed. This paper provides a theoretical basis for dynamic control of roll thickness and fully considers the influence of the rigid vibration of rolling mill system on the dynamic characteristics of roll bending deformation. The kinematics analysis is carried out. The displacement field of rigid body and variable body in flexible multi-body mechanical system is described, and the rigid-flexible coupling dynamic model of roll system of plate and strip mill is established, and the coupling motion modal analysis of roll system of rolling mill is carried out. The analytical solutions of vibration frequency and modal mode function of roll deformation motion are discussed and compared at different times. The difference between the inherent modal mode function of roller obtained from the traditional structural dynamics and the modal mode function of roll considering the rigid vibration of rolling mill system. The coupling of roll motion and dynamic characteristics of rolling deformation zone during rolling process is considered. Use the pattern. Through kinematics analysis, the displacement field description of roll system and rolling piece dynamics system is realized, and the multi-parameter coupling dynamic model of strip mill roll system is established, and the coupling motion mode analysis of rolling mill roll system is carried out. The dynamic simulation model of strip rolling mill system based on the coupling characteristics of rigid and flexible roll system is established by analyzing the analytical solution of the modal mode mode function of roll deformation and the kinematic characteristics of metal transverse flow in the deformation zone. It includes the following aspects: the dynamic model of rigid vibration coupling of rolling mill roll system, the rigid-flexible coupling dynamic model of rolling mill roll system. The coupled dynamic model of rolling deformation zone is developed, and the motion characteristics of the work roll along the vertical and horizontal directions are taken into account at the same time. The rolling mechanics model in the deformation zone is modified. Because the lateral mode function of roll changes with the rigid movement of the roll system, it is based on the characteristics of the model itself. The central differential method is selected to simulate the system, and then the dynamic model of strip mill system based on the coupling characteristics of rigid and flexible roll system is obtained, and the simulation analysis is carried out. The model can be used to simulate the rolling process. It can reflect the comprehensive dynamic information of plate thickness, provide the theoretical basis for virtual rolling, and provide a platform for the application of advanced control theory. This paper starts from the point of view of physical and mechanical properties. Combined with the coupling non-uniform deformation of workpiece and roll system, the dynamic characteristics of roll system and metal strip are truly reflected, and the rolling stability and strip surface vibration are revealed during the rolling process. The coupling dynamic mechanism model has important theoretical and practical value in promoting the development of dynamic modeling of rolling mill system and improving the control precision of rolling process.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TG333.7

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