發(fā)布時間：2018-05-24 05:46

  本文選題：軋機(jī)主傳動系統(tǒng) + 非線性振動　； 參考：《燕山大學(xué)》2015年博士論文

【摘要】：軋機(jī)振動問題是困擾鋼鐵行業(yè)多年并給生產(chǎn)帶來嚴(yán)重影響與危害的技術(shù)難題,其現(xiàn)象異常復(fù)雜。主傳動系統(tǒng)扭轉(zhuǎn)振動(扭振)是影響產(chǎn)品質(zhì)量的重要因素,也是軋機(jī)振動的主要形式之一。在軋機(jī)主傳動系統(tǒng)扭振分析中,由于設(shè)計、安裝和磨損等原因造成的間隙對扭振影響是不可忽視的。另外,帶鋼振動在板帶軋機(jī)軋制過程中不可避免,帶鋼對主傳動系統(tǒng)扭振的影響也鮮有人重視。本文主要針對考慮各部位間隙的軋機(jī)主傳動系統(tǒng)扭振,帶鋼振動以及帶鋼對主傳動系統(tǒng)扭振的影響進(jìn)行分析和研究。主要研究工作如下:采用集中質(zhì)量法建立軋機(jī)主傳動系統(tǒng)5自由度離散型扭振模型,基于實測數(shù)據(jù)確定模型參數(shù)及外力載荷形式,并對扭振系統(tǒng)進(jìn)行固有特性分析。再根據(jù)系統(tǒng)中間隙存在的實際位置及電動機(jī)拖動特性,將已建立的扭振模型優(yōu)化為4自由含間隙的非線性扭振動力學(xué)模型�；诤g隙扭振系統(tǒng)動力學(xué)模型,分別在打滑和咬鋼沖擊狀態(tài)下考慮間隙對扭振系統(tǒng)的影響。采用龍格-庫塔方法進(jìn)行數(shù)值計算,得到間隙影響的扭振系統(tǒng)動態(tài)響應(yīng)數(shù)值結(jié)果。比較分析不同間隙簡化形式對系統(tǒng)動態(tài)響應(yīng)及各軸段扭矩放大系數(shù)(TAF)的影響,以及不同間隙位置和尺寸對扭振系統(tǒng)各軸段TAF的影響。根據(jù)軋輥與帶鋼的運動機(jī)理,建立軋輥與帶鋼耦合的非線性動力學(xué)模型。將連軋過程中的帶鋼等效為軸向運動Euler梁,軋輥等效為定軸轉(zhuǎn)動的慣性元件,基于哈密頓原理,建立慣性邊界下軸向運動Euler梁的非線性振動方程,利用Kantorovich時間平均法簡化運動方程和邊界條件,并采用修正迭代法求解振動方程。通過數(shù)值計算獲得帶鋼非線性振動的幅頻響應(yīng)曲線,并討論慣性邊界下的帶鋼軸向速度、帶鋼張力、機(jī)架間距以及軋輥轉(zhuǎn)動慣量等參數(shù)對帶鋼振動特性的影響。針對帶鋼對軋機(jī)主傳動系統(tǒng)扭振的影響,建立帶鋼與雙機(jī)架傳動系統(tǒng)耦合扭振模型,并進(jìn)行模態(tài)分析,獲得系統(tǒng)的固有頻率和固有振型。然后對帶鋼橫斷面施加激振力進(jìn)行諧響應(yīng)分析,通過對比模態(tài)分析結(jié)果,進(jìn)一步研究帶鋼與軋機(jī)主傳動系統(tǒng)扭振之間的固有屬性關(guān)系。綜上所述,軋機(jī)主傳動系統(tǒng)扭振的工程控制和優(yōu)化設(shè)計依賴于對系統(tǒng)復(fù)雜運動特性的深入了解和研究。在對軋機(jī)主傳動系統(tǒng)扭振進(jìn)行分析時,將間隙實際位置、實際尺寸及帶鋼振動等因素加以考慮,建立具體的符合實際的動力學(xué)模型和數(shù)學(xué)模型,這樣才能得到更合理、更準(zhǔn)確的分析結(jié)果,為軋機(jī)系統(tǒng)的設(shè)計分析和主傳動系統(tǒng)扭振的工程分析提供重要的參考價值和理論依據(jù)。
[Abstract]:The vibration problem of rolling mill is a technical problem which has troubled the iron and steel industry for many years and has brought serious influence and harm to the production. Torsional vibration (torsional vibration) of main transmission system is an important factor affecting product quality and one of the main forms of rolling mill vibration. In the analysis of torsional vibration of main drive system of rolling mill, the influence of gap caused by design, installation and wear on torsional vibration can not be ignored. In addition, the vibration of strip is inevitable in the rolling process of strip mill, and the influence of strip steel on torsional vibration of main transmission system is seldom paid attention to. In this paper, the torsional vibration of main transmission system of rolling mill, the vibration of strip steel and the influence of strip steel on torsional vibration of main transmission system are analyzed and studied. The main research work is as follows: a 5-DOF discrete torsional vibration model of main drive system of rolling mill is established by means of concentrated mass method. Based on the measured data, the parameters of the model and the form of external force load are determined, and the inherent characteristics of torsional vibration system are analyzed. According to the actual position of gap and the characteristics of motor drag, the established torsional vibration model is optimized to a nonlinear torsional vibration dynamic model with 4 free clearances. Based on the dynamic model of torsional vibration system with clearance, the effect of clearance on torsional vibration system is considered under sliding and steel bite impact respectively. By using Runge-Kutta method, the numerical results of dynamic response of torsional vibration system affected by clearance are obtained. The effects of different clearance simplified forms on the dynamic response of the system and torque magnification factor of each shaft segment are compared and analyzed, as well as the effects of different clearance positions and sizes on the TAF of each shaft segment of the torsional vibration system. According to the motion mechanism of roll and strip, a nonlinear dynamic model of roll and strip coupling is established. The strip in continuous rolling process is equivalent to an axially moving Euler beam, and the roll is equivalent to an inertial element with a fixed axis rotation. Based on the Hamiltonian principle, the nonlinear vibration equation of an axially moving Euler beam with inertial boundary is established. The equations of motion and boundary conditions are simplified by Kantorovich time averaging method, and the vibration equations are solved by modified iterative method. The amplitude-frequency response curves of nonlinear vibration of strip are obtained by numerical calculation, and the effects of axial velocity, tension, stand spacing and roll moment of inertia on the vibration characteristics of strip are discussed. In view of the influence of strip steel on torsional vibration of main drive system of rolling mill, the coupled torsional vibration model of strip and double frame transmission system is established, and modal analysis is carried out to obtain the natural frequency and mode shape of the system. Then the harmonic response analysis of the excited force applied on the cross section of the strip is carried out, and the relationship between the torsional vibration of the strip steel and the main drive system of the rolling mill is further studied by comparing the results of the modal analysis. In conclusion, the engineering control and optimal design of torsional vibration of the main drive system of rolling mill depend on the deep understanding and research on the complex motion characteristics of the system. In the analysis of torsional vibration of main drive system of rolling mill, the actual position of clearance, actual size and vibration of strip steel are considered, and concrete dynamic and mathematical models are established to get more reasonable results. More accurate analysis results provide an important reference value and theoretical basis for the design and analysis of rolling mill system and the engineering analysis of torsional vibration of main drive system.
【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】：2015
【分類號】：TG333

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本文編號：1927905