本文選題：二十輥軋機(jī)　切入點(diǎn)：振痕振動激勵機(jī)理　出處：《重慶大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：不銹鋼廣泛應(yīng)用于航空航天、通信、汽車工業(yè)以及生活的各個方面。隨著我國制造業(yè)的飛速發(fā)展,其對鋼鐵產(chǎn)品需求量持續(xù)增加,同時其制造精度的需要對不銹鋼性能和質(zhì)量的要求越來越高。然而,帶鋼在軋制過程中,表面會產(chǎn)生明暗交替的振痕,嚴(yán)重影響帶鋼表面質(zhì)量,嚴(yán)重時必須進(jìn)行重新加工或切除,大幅度地增加了企業(yè)生產(chǎn)成本,造成巨大的經(jīng)濟(jì)損失。因此,深入研究軋機(jī)振痕振動特征和激勵機(jī)理,研究有效識別振痕振動的方法,提出減少振痕產(chǎn)生的控制措施,對提高帶鋼表面質(zhì)量,具有重要的理論意義和工程價值。為有效地識別和監(jiān)測振痕振動,本文針對誘發(fā)森吉米爾二十輥軋機(jī)振痕振動的激勵機(jī)理和振痕振動特征進(jìn)行了研究,基于軋機(jī)扭振打滑模型,分析了不同工況時軋輥扭矩變化特征,揭示了軋機(jī)扭振激勵與振痕振動特征的關(guān)系;在分析前后滑區(qū)軋制力變化特征及不同軋制參數(shù)加載方式對軋機(jī)振痕振動特征影響的基礎(chǔ)上,究明了軋制參數(shù)變化激勵與振痕振動特征的關(guān)系;建立了軋輥缺陷時變接觸剛度模型和軋機(jī)有限元模型,解明了軋輥和軸承局部缺陷誘發(fā)軋機(jī)振痕振動的激勵機(jī)理和振動特征的問題�；陟�、自適應(yīng)小波和小波包分解能量分布信號處理方法,提出了振痕振動識別方法,并以Labview軟件為平臺開發(fā)了軋機(jī)振痕振動實(shí)時在線監(jiān)測系統(tǒng)。現(xiàn)場試驗數(shù)據(jù)分析結(jié)果與理論分析結(jié)果的一致性,驗證了理論分析的正確性和合理性。論文的主要研究工作如下:①基于軋機(jī)傳動系統(tǒng)扭振動力學(xué)模型,將軋輥之間打滑引入到軋機(jī)傳動系統(tǒng)扭振模型中,分析了軋機(jī)傳動系統(tǒng)扭振激勵與振痕振動特征的關(guān)系;通過對不同軋制速度,不同軋輥之間摩擦系數(shù)對軋機(jī)扭振特性影響的分析,揭示了軋制速度,摩擦系數(shù)對軋輥扭矩的影響特征,并研究了軋機(jī)扭振的控制方法。試驗結(jié)果與仿真結(jié)果的一致性,不僅驗證了理論分析軋機(jī)振痕振動特征的正確性,而且為軋機(jī)機(jī)扭振誘發(fā)軋機(jī)振痕振動特征的有效識別提供了理論與實(shí)踐依據(jù)。②針對軋制參數(shù)變化激勵與軋機(jī)振痕振動特征關(guān)系的問題,分析了軋制過程中前滑區(qū)和后滑區(qū)變化對軋制力的影響和軋制力變化規(guī)律;基于森吉米爾二十輥軋機(jī)垂向橫向耦合的動力學(xué)模型,研究了軋制力和軋機(jī)速度對軋機(jī)振痕振動特征的影響,揭示了軋制參數(shù)變化激勵與軋機(jī)振痕振動特征的關(guān)系。同時通過試驗驗證了軋制力變化規(guī)律和森吉米爾軋機(jī)動力學(xué)模型的正確性和有效性,為分析和識別振痕振動提供了理論與實(shí)踐依據(jù)。③針對軋輥和軸承局部缺陷誘發(fā)振痕振動的激勵機(jī)理和振動特征的問題,在考慮軋輥局部缺陷時軋輥之間的邊緣接觸效應(yīng)基礎(chǔ)上,分析了軋輥之間接觸剛度變化過程,揭示了軋輥局部缺陷誘發(fā)軋機(jī)振痕振動的激勵機(jī)理和振動特征;建立了軋機(jī)三維有限元模型,分析了軸承局部缺陷時軋機(jī)振痕振動特征。通過試驗數(shù)據(jù)驗證了仿真結(jié)果的正確性和模型的有效性,為研究軋機(jī)局部缺陷誘發(fā)振痕振動的激勵機(jī)理和振痕振動特征識別方法奠定了基礎(chǔ)。④針對軋機(jī)振動信號非平穩(wěn)特征和軋機(jī)振痕振動特征識別問題,引入了包絡(luò)譜信息熵和排列熵方法,分析了振痕振動時軋機(jī)加速度信號及扭矩信號的特征;基于自適應(yīng)小波方法,分析了軋輥表面缺陷尺寸大小對軋機(jī)振痕振動特征的影響;提出了小波包分解能量分布的方法,研究了振痕特征頻率分布特征。通過試驗結(jié)果與仿真結(jié)果的對比,驗證了包絡(luò)譜信息熵和排列熵,自適應(yīng)小波方法,以及小波包分解能量分布對振痕識別的有效性。⑤通過對軋機(jī)傳動系統(tǒng)扭振、軋制參數(shù)變化、軋輥表面局部缺陷和軸承局部缺陷誘發(fā)軋機(jī)振痕振動激勵機(jī)理與振痕振動特征關(guān)系的研究,揭示了不同激勵機(jī)理時振痕振動特征的表現(xiàn)形式;另外,證實(shí)了采用振動加速度信號獲得振痕振動特征的有效性,在結(jié)合最佳監(jiān)測測點(diǎn)選擇研究的基礎(chǔ)上,利用Labview軟件開發(fā)了一套森吉米爾二十輥軋機(jī)振痕振動實(shí)時在線監(jiān)測系統(tǒng),該系統(tǒng)具有無線與有線發(fā)射信號,信號采集與信號分析,以及數(shù)據(jù)回放等功能。通過對森吉米爾二十輥軋機(jī)長期監(jiān)測,取得了較為滿意的報警監(jiān)測效果,為實(shí)時在線監(jiān)測,及時發(fā)現(xiàn)振痕振動提供了切實(shí)可行的工具。
[Abstract]:Stainless steel is widely used in aerospace, communication, automobile industry and all aspects of life. With the rapid development of China's manufacturing industry, the demand for steel products continued to increase, while the manufacturing precision of the need for stainless steel performance and quality have become increasingly demanding. However, the strip in the rolling process, the surface will produce light and shade alternate oscillation marks seriously affect the surface quality of the strip, which must be reworked or removed, greatly increased production costs, resulting in huge economic losses. Therefore, in-depth study of rolling mill vibration mark vibration characteristics and incentive mechanism, method of effective identification of oscillation mark vibration, puts forward the control measures to reduce vibration. To produce, to improve the surface quality of the strip, which has important theoretical significance and engineering value. In order to effectively identify and monitor the vibration mark vibration, this paper induced by Jimmy, Sen twenty roller rolling mill vibration Mark vibration mechanism and vibration characteristics of vibration marks were studied. The torsional vibration of rolling mill based on slip model, analyzed the change characteristics of roll torque in different working conditions, reveals the relationship between the vibration excitation and vibration characteristics of the vibration mark; based on the analysis of characteristics of rolling force variation before and after sliding and effects of different loading modes on the rolling parameters the vibration characteristics of the rolling mill vibration mark, the relationship between rolling parameters and study to understand the vibration characteristics of the excitation vibration mark; a roll defect time-varying contact stiffness model and finite element model of rolling mill, including the roll and bearing defects induced by rolling mill vibration mark vibration mechanism and vibration characteristics of the problem. Based on adaptive wavelet entropy. And the energy distribution of the wavelet packet signal processing method, put forward the vibration mark vibration method, and Labview software as a platform to develop the online real-time monitoring system of rolling mill vibration. The vibration mark The consistency of data analysis results of the test results and theoretical analysis, verify the correctness of the theoretical analysis and rationality. The main works of this paper are as follows: the torsional vibration of rolling mill drive system based on the model, will roll into slipping between the torsional vibration model of rolling mill drive system, analyzes the relationship between torsional vibration and vibration excitation mark the vibration characteristics of different rolling speed; through the analysis of the influence of different roll, the coefficient of friction between the torsional vibration characteristics of rolling mill, reveals the influence on the rolling speed, roll torque characteristics of friction coefficient, and the control method of torsional vibration of the rolling mill. The consistency of test results and simulation results verify the correctness of the theory, not only analysis of vibration characteristics of rolling mill vibration mark, and provides the theoretical and practical basis for the effective recognition of rolling mill torsional vibration of rolling mill vibration induced vibration mark characteristics. The rolling parameters The relationship between excitation and vibration characteristics of rolling mill vibration mark problem, analysis of the rolling process before the slide change zone and backward slip zone influence on rolling force and rolling force; Sendzimir twenty roller mill vertical dynamics model based on transverse coupling, the rolling force and rolling speed influence on the vibration characteristics of rolling mill vibration mark and reveals the relationship between rolling parameters change excitation and vibration characteristics of rolling mill vibration mark. At the same time to verify the correctness and effectiveness of the rolling force variation and dynamics model of Sendzimir mill through experiment, provides the theoretical and practical basis for the analysis and identification of oscillation mark. The vibration of roller and bearing defects induced by local vibration vibration mark mechanism and vibration characteristics of the problem, considering the effect of roll edge contact based local defects between the rolls and rolls are analyzed between contact stiffness change process, revealing The roller mill vibration mark induced local defects of vibration mechanism and vibration characteristics of rolling mill; established a three-dimensional finite element model, analyzes the local defects of rolling mill vibration mark bearing vibration characteristics. Through the test data to verify the correctness and validity of the simulation results, which laid the foundation for the research of local defects induced by vibration mark mill vibration mechanism and vibration characteristics of vibration mark recognition method. According to the non-stationary characteristics and vibration characteristics of rolling mill vibration mark recognition of rolling mill vibration signal, introduces the envelope spectrum entropy and permutation entropy method, analyzes the characteristics of mill acceleration signal and the torque signal when oscillation vibration; adaptive wavelet method based on the analysis of the impact of roller surface defect size on the vibration characteristics of rolling mill vibration mark; put forward the wavelet packet decomposition energy distribution method, studied the vibration mark characteristic frequency distribution. Through the test Comparison of test results and simulation results, verify the envelope spectrum entropy and permutation entropy, adaptive wavelet method, and wavelet packet decomposition energy distribution on the effectiveness of the identification marks. Through the vibration of drive system torsional vibration of rolling mill, rolling parameters, study the local defects of roll surface and bearing vibration mechanism and vibration mark relationship mark the vibration characteristics of the local defect induced by vibration mill, reveals the different forms of incentive mechanism of oscillation mark of vibration characteristics; in addition, confirms the validity of the obtained oscillation vibration characteristics using vibration acceleration signal, on the basis of the optimum monitoring point selection research, developed a set of real-time online monitoring system of twenty roll of Sendzimir mill rolling mill vibration mark vibration using Labview software, the system is wired and wireless transmission signal, signal acquisition and signal analysis, and data playback. On the two by gelmir Sen The long-term monitoring of ten high rolling mill has obtained a satisfactory alarm monitoring effect. It provides a practical tool for real-time on-line monitoring and timely discovery of vibration trace vibration.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TG333

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