Adaptive Torsional Vibration Control of the Nonlinear Rolling Mill …

This paper studies the torsional vibration suppression control problem for the nonlinear rolling mill main drive system with performance constraint requirements and unknown measurement sensitivities. Firstly, considering the nonlinear friction between the roll gaps, a torsional vibration model of the main drive system of rolling mill is …

Adaptive Torsional Vibration Control of the Nonlinear Rolling Mill …

It is strictly proved that the resulting closed-loop system is stable in the sense of uniformly ultimately boundedness and both transient and steady-state performances of the load speed are preserved. This paper studies the torsional vibration suppression control problem for the nonlinear rolling mill main drive system with performance …

Rolling mill fault diagnosis under limited datasets

Mill fault and mill abnormal vibration experiments were carried out in our laboratory to validate the diagnostic performance of the suggested approach. ... Two excitation exciters are used to simulate horizontal vibration and vertical vibration, and the excitation frequency of the excitation exciter is adjusted by the oscilloscope. To obtain ...

Study on Vertical Vibration Characteristics of the 2-DOF …

mill vertical vibration model with a single point weak fault on the outer raceway was established. With the practical parameters of the

A Fault Diagnosis Method of Rolling Mill Bearing at Low …

Aiming at fault vibration signals of rolling bearings with features of stronger non-stationarity and easy to be disturbed by strong background noise, a fault diagnosis method based on the short ...

Prediction and analysis of cold rolling mill vibration based on …

First, a novel rolling mill vibration monitoring method based on mill vibration and rolling process data was developed for a tandem cold rolling mill. Second, support vector regression, a neural-network-based method, and an extreme gradient boosting method were applied to predict the mill vibrations based on a data-driven …

Vertical Vibration Characteristics of Strip Rolling Mill …

Therefore, in this paper, a 3-DOF vertical vibration model of strip mills with compound failure of the inner and outer raceways of work roll bearings is established. The failure ... mill. When the fault spreads to a certain extent, it will cause the rolling mill to vibrate. Since the failure is located on the inner raceway of the

Vertical–horizontal coupling nonlinear vibration …

This paper presents the results of developing a vibration model for the rolling mill vertical system with respect to the roll gap under the unsteady lubrication conditions to address the ...

Vertical horizontal coupling nonlinear vibration …

Based on these dynamic rolling forces and the mechanical vibration of the rolling mill, a vertical–horizontal coupling nonlinear vibration dynamic model was established. The amplitude–frequency equation of the main resonance was derived by using the multiple-scale method. At last, the parameters of the 1780 rolling mill were used

15 Mechanical Vibration Problems & Symptoms

3) Power supply phase fault. Symptom characteristics of power supply phase failure: Phase problems will cause a doubling of the power supply frequency; (2FL) is accompanied by (1/3) FL sidebands; The amplitude of electromagnetic vibrations at two power supply frequencies (2FL) may exceed 25 mm/s peaks if power supply faults are …

PREDICTIVE MODELLING OF VERTICAL STIRRED MILLS …

Vertical stirred mills are being widely used for the regrinding application. Although it is being used since late 1979, some aspects of its operation are still challenging. ... 2007: 84-91. Biswal, Sailendu, Jithin George, e G.R. Sabareesh. "Fault Size Estimation Using Vibration Signatyres in a Wind Turbine Test-Rig." international ...

Review of control and fault diagnosis methods applied to coal mills

To show the relation among different variables, the dynamic response of the important coal mill variables for a vertical roller medium speed mill during start-up, shutdown, steady state, and load change condition, is provided in Fig. 3.The real time per minute data is collected from Vadinar Power Corporation Limited (VPCL), a captive …

Vibration Analysis for Machinery Health Diagnosis