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Nov 15, 2022Bearing failure is a common cause of machinery breakdown, resulting in lost production and accidents. Therefore, the early and automatic diagnosis of bearing faults is attracting increasing amounts of attention, in particular through vibration analysis. The vibration signals caused by rotating machines are multi-component and modulated signals; it is
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The effect of mill modulus control gain on hot rolling mill vibration is positive compensation, negative compensation and no compensation, respectively. Based on the above analysis, a practical measure to relieve mill vibration can be proposed. The vibration frequency for the hot rolling mill in general is 10-70 Hz.
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Rolling element bearings are common components of any machine and defects in them are one of the most common types of the machine faults. Many vibration signal analysis techniques are
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Torsional Vibration Analysis of the Rolling Mill's Main Drive System with Backlash Journal of Chung Cheng Institute of Technology May 2011
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Aug 15, 2022Rolling element bearing utilized for the wind turbine, electric vehicles are often operated under varying speed conditions other than constant speed due to external wind or load variations. It is very difficult to diagnose a rolling element bearing under varying speed conditions because changing the rotational speed means that the fault-related
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Jun 24, 2013The reverse Biorthogonal wavelet 5.5 is considered as the most appropriate wavelet for decomposing the bearing vibration signal, on the basis of the maximum energy-to-Shannon entropy ratio criterion. The imperial trend suggested in diagnosing the combined localized defects of rolling bearing is based on experimental analysis at various rotor
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For the convenience of calculation and analysis, owing to the symmetry of rolling mill vibration, the rolling mill can be simplified as an effective and reliable 2-DOF vibration system [ 24 ]. The coupling vibration model of the upper rolls of the hot rolling mill under multiple nonlinear effects is established, as shown in Figure 6. Figure 6
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W artykule przedstawiono kompleksową analizę procesu chłodzenia walcw walcarki przepychowej w walcowni podczas procesu walcowania płproduktw wykorzystywanych do produkcji rur bez szwu. Ważnym zagadnieniem w tym temacie jest wpływ parametrw chłodzenia za pomocą specjalnych programowalnych dysz rżnego typu o wymaganym
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These costs can be significant – in fact, water-cleaning costs are typically higher than the cost of the lubricants themselves. SKF's range of solutions for hot rolling mills can help you meet the demands of increased productivity and quality in cost-effective ways. Our specialized bearings can handle the high loads and harsh environments
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Fault Detection of Roller Bearing Using Vibration Analysis . Rabinarayan Sethi. 1.Subhasini Muduli. 2 . Abstract—The rolling elementbearings are commonly used in rotating machinery, it mostly covers a broad range of rotating machinery and plays a significant role in industrial applications which is considered as a most critical element.
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Considering the interaction between vibration of strip and roll, the dynamic vibration model of rolling mill is established. On this basis, the time delayed feedback is introduced to control the vibration of the roll system. The amplitude frequency response of the coupled vibration control equation is obtained by using the multiple scales method.
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Qian, C., Hua, C., Zhang, L., Bai, Z. (2020). Adaptive neural torsional vibration suppression of the rolling mill main drive system subject to state and input
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Aug 15, 2022Rolling element bearing utilized for the wind turbine, electric vehicles are often operated under varying speed conditions other than constant speed due to external wind or load variations. It is very difficult to diagnose a rolling element bearing under varying speed conditions because changing the rotational speed means that the fault-related features are variable. To
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Nov 01, 2020The traditional mill chatter mechanism model cannot meet the monitoring and rapid diagnosis needs of the rolling process in the field. In this paper, a data-driven mill vibration analysis method is proposed. The main objective of this study was to develop a mill vibration monitoring method and an intelligent algorithm for mill chatter early
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W artykule przedstawiono kompleksową analizę procesu chłodzenia walcw walcarki przepychowej w walcowni podczas procesu walcowania płproduktw wykorzystywanych do produkcji rur bez szwu. Ważnym zagadnieniem w tym temacie jest wpływ parametrw chłodzenia za pomocą specjalnych programowalnych dysz rżnego typu o wymaganym przepływie i
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Oct 26, 2022This paper is focused on the inherent characteristics of the main drive system of the F5 cold-rolling mill in a steel plant. First, the main transmission mechanical structure was simplified to a five-inertia torsional vibration model. Secondly, the coupled torsional vibration model of strip and roll was established. The electromechanical coupling model
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For the influence of rolling bearing radial clearance on the whole vibration in the aero-engine whole system, a real engine rotorbearing-casing whole model is established. The rotor and casing systems are modeled by means of FEM; the support systems are modeled by lumped-mass model; rolling bearing radial clearance and strong-nonlinearity of
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Generally, three kinds of typical vibration have been observed in rolling by scholars. They are identified as vertical vibration, torsional vibration, and horizontal vibration. And the vertical vibration is classified into two types: third-octave-mode chatter (120~250 Hz) and fifth-octave-mode chatter (500~700 Hz).
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analyzed. The results can provide a theoretical basis for restraining and controlling rolling mill vibration. 2. Vertical-torsional-horizontal coupling vibration model of the rolling mill 2.1. Dynamic model of rolling process under nonlinear friction The geometry of the roll bite is illustrated in Fig. 1, where 1 $ 5 and 1 $ 6 are the original
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Vibration analysis of rolling element bearings with various defects under the action of an unbalanced force, Mechanical Systems and Signal Processing, 20 (2006), pp. 1967-1991. S.A. Abdusslam, F. Gu, A. Ball. Bearing fault diagnosis based
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Nov 08, 2016Rolling mill vibration is no different. The most damaging modes of mill vibration involve some very specific natural resonances of the mill stand. If no structural resonances are excited then the vibration
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According to the "Hill rolling force formula", taking particular account of the influence from horizontal vibration of rolled piece in roll gap, a dynamic rolling force model is analyzed. Considering the interaction between vibration of strip and roll, the dynamic vibration model of rolling mill is established. On this basis, the time delayed feedback is introduced to
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May 26, 2021Based on the analysis of the influence of roll vibration on the elastoplastic deformation state of a workpiece in a rolling process, a dynamic rolling force model with the hysteresis effect is established.
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Aiming at the problem that the fault of rolling bearing is difficult to diagnose accurately, proposes a fault diagnosis method of rolling bearing based on principal component analysis and naive Bayesian algorithm. Firstly, the vibration signal of rolling bearing is decomposed by empirical mode decomposition method, and the intrinsic mode function components with different
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Rolling bearings are important components in rotary machinery systems. In the field of multi-fault diagnosis of rolling bearings, the vibration signal collected from single channels tends to miss some fault characteristic information. Using multiple sensors to collect signals at different locations on the machine to obtain multivariate signal can remedy this
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Nov 11, 2022The finite element method (FEM) computer simulation of the three-high radial shear rolling of Ti-6Al-4V alloy round billets was conducted using QForm software. The simulation was performed for the MISIS-100T rolling millrsquo;s three passes according to the following rolling route: 76 mm (the initial billet diameter) rarr;65 mmrarr;55
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Vibration velocity sensors are installed on the top surface of every mill rack to long-term monitor mill vibrations. Fig. 1. Experiment equipment and layout of rolling mill a) b) The mill modulus control gain is set as 0.4, 0.6 or 0.8 with the same other conditions, and each gain value is applied to
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The strip rolling mills can be divided into the non-statically determinate and statically determinate mills according to the statically determinate theory of mechanism. This statically determinate characteristic of the mill does not be distinguished in the traditional mill vibration analysis.
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Jan 01, 2021Three phases of the vibration process: (a) upward rolling, (b) common rolling and (c) downward rolling. 2.1. Geometrical parameters One of the biggest differences between stable and unstable rolling is that the contact angle is not constant but varies with the vertical vibration speed of the work roll.
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Nov 15, 2022Bearing failure is a common cause of machinery breakdown, resulting in lost production and accidents. Therefore, the early and automatic diagnosis of bearing faults is attracting increasing amounts of attention, in particular through vibration analysis. The vibration signals caused by rotating machines are multi-component and modulated
WhatsApp:+8617329420102
Nov 15, 2015modeling and analysis of interstand tension control in 6-high tandem cold rolling mill：
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Jul 14, 2016This type of speed-dependant vibration will be a mechanical forced vibration within the rolling mill, for example due to a defective gear or bearing. Hence, the team collected data for all potential sources of
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Apr 21, 2020The aim is to reveal the mechanism of rolling mill vibration in the continuous rolling process, the mechanism of rolling mill non-linear vibration instability and its changing law, and to explore the optimization of rolling process and the control method of rolling mill structure so as to improve the rolling process.
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Identified factors affecting slide in steel rolling mill machines using root cause analysis. 2. Conducted dynamic response simulation on coal conveying tower using FEA software and make
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The rolling mill vibration not only seriously causes the strip thickness heterogeneity, but also damages the rolling mill equipment and its electrical components. Existing vibration suppression Expand 3 Analysis of Nonlinear Torsional Vibration Characteristics of EV Powertrain Considering Rotor Eccentricity of PMSM Donghai Hu Engineering 2018
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Stability Analysis Of A Nonlinear Coupled Vibration Model. Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips. in most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and verticalhorizontal directions, or the multiple rolls system is simplified to a single mass system. however, the
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Oct 26, 2022This paper is focused on the inherent characteristics of the main drive system of the F5 cold-rolling mill in a steel plant. First, the main transmission mechanical structure was simplified to a five-inertia torsional vibration model. Secondly, the coupled torsional vibration model of strip and roll was established.
WhatsApp:+8617329420102
Jan 01, 2008The results of vibration testing at a rolling mill site and dynamic parameter analysis found that one of the natural frequencies of its displacement feedback apparatus just coincided with
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Aiming at the problem that the fault of rolling bearing is difficult to diagnose accurately, proposes a fault diagnosis method of rolling bearing based on principal component analysis and naive Bayesian algorithm. Firstly, the vibration signal of rolling bearing is decomposed by empirical mode decomposition method, and the intrinsic mode function
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Feb 15, 2017In present research, a vibration model with two degrees of freedom is proposed for a cold sheet rolling mill and the stiffness parameters of different mill elements are calculated. A numerical simulation and a finite element analysis are also carried out for the related vibrations.
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