多源谐波诱发CSP轧机主传动耦合振动研究

发布时间：2018-06-11 12:25

本文选题：CSP轧机 + 电能谐波　；参考：《北京科技大学》2015年博士论文

【摘要】：几十年来,轧机振动问题一直是影响轧钢生产稳定和产品质量的难题,随着现代连轧机装备技术的发展,轧机振动现象及特性表现得更加复杂。本文重点以某厂交-交变频驱动的CSP热连轧机F3主传动系统扭振问题为研究对象,通过现场测试发现轧机在轧制过程中表现出多态耦合振动现象。通过理论分析、数值仿真及实验验证等多种手段对该热连轧机耦合振动机理进行了深入研究并提出了抑振措施。本文的主要工作及研究成果如下： (1)利用自制的轧机耦合振动在线监测系统对CSP轧机振动进行了综合测试,得到在不同工况下的振动行为及特征,实验证明了该热连轧机在轧制薄带钢时存在复杂性耦合振动行为并伴随着复杂的谐波现象,为理论研究轧机耦合振动机理提供了科学依据。 (2)以该热连轧机为研究对象,建立了交交变频一同步电机*轧机主传动*辊系负载的解析模型,得到各单元相互耦合的关联变量,获得了电能谐波与轧机辊系通过传动及轧制变形区相耦合的理论模型。 (3)利用Matlab/Simulink及ANSYS等计算软件,分别研究了电能驱动变频谐波和轧制负载谐波与轧机传动机械的耦合机制。认为轧机传动系统扭振是受驱动能量源、负载扰动源及机械传动(能量传递源)综合影响下的耦合振动行为,其研究结果得到了实验验证。 (4)考虑轧机传动在电能谐波源与负载谐波源双重激励下,分别以稳态加载条件下的多自由度线性模型和非线性刚度、阻尼的双重非线性等效模型,对轧机传动系统扭振特性进行了理论求解及仿真研究。结果表明轧机传动系统在多源谐波激励下呈现多态耦合振动特征。 (5)依据现场测试、理论研究和仿真分析,提出该热连轧机振动抑振措施,从抑制电能质量谐波和轧制负载力矩扰动以及改变传动结构参数等角度进行了理论仿真和现场应用实验,取得了良好效果。
[Abstract]:In recent decades, rolling mill vibration has been a difficult problem affecting the stability of rolling mill production and product quality. With the development of equipment technology of modern tandem rolling mill, the vibration phenomenon and characteristics of rolling mill are more complicated. In this paper, the torsional vibration of F3 main drive system of CSP hot strip mill driven by AC-AC frequency conversion is taken as the research object. Through field test, it is found that the rolling mill exhibits the phenomenon of polymorphic coupling vibration. Through theoretical analysis, numerical simulation and experimental verification, the coupled vibration mechanism of the hot strip mill was studied and the vibration suppression measures were put forward. The main work and results of this paper are as follows: 1) the vibration of CSP rolling mill is comprehensively tested by the self-made on-line monitoring system of rolling mill coupling vibration, and the vibration behavior and characteristics of CSP mill under different working conditions are obtained. The experimental results show that the hot strip rolling mill has complex coupled vibration behavior and complicated harmonic phenomenon, which provides a scientific basis for the theoretical study of the coupled vibration mechanism of rolling mill. The analytical model of the main drive * roll system load of AC-AC frequency conversion synchronous motor * mill is established, and the relative variables of each unit coupling with each other are obtained. A theoretical model of coupling of electric energy harmonics with rolling deformation zone is obtained. The coupling mechanism of power drive harmonic with rolling load harmonics and rolling load harmonics is studied by Matlab / Simulink and ANSYS respectively. It is considered that torsional vibration of rolling mill transmission system is coupled vibration behavior under the combined influence of driving energy source, load disturbance source and mechanical transmission (energy transfer source). The experimental results are verified by experiments. Considering the dual excitation of power harmonic source and load harmonic source, the rolling mill drive is modeled by the linear model of multiple degrees of freedom and the double nonlinear equivalent model of nonlinear stiffness and damping under steady loading condition, respectively. The torsional vibration characteristics of rolling mill transmission system are theoretically solved and simulated. The results show that the transmission system of rolling mill presents the characteristic of polymorphic coupling vibration under multi-source harmonic excitation. Based on the field test, theoretical research and simulation analysis, the vibration suppression measures of the hot strip mill are put forward. Theoretical simulation and field application experiments are carried out from the aspects of suppressing harmonic of power quality and disturbance of rolling load torque and changing transmission structural parameters. Good results are obtained.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TG333

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