Bifurcation Control for Electromechanical Coupling Vibration in Rolling Mill Drive System Based on Nonlinear Feedback

2010 ◽  
Vol 46 (08) ◽  
pp. 160 ◽  
Author(s):  
Bin LIU
Keyword(s):  
Rolling Mill ◽  
Electromechanical Coupling ◽  
Drive System ◽  
Bifurcation Control ◽  
Nonlinear Feedback ◽  
Coupling Vibration

Electromechanical Coupling Vibration of Rolling Mill Excited by Variable Frequency Harmonic

2014 ◽  
Vol 912-914 ◽  
pp. 662-665 ◽  
Author(s):  
Yi Fang Zhang ◽  
Xiao Qiang Yan ◽  
Qi Hui Ling
Keyword(s):  
Torsional Vibration ◽  
Rolling Mill ◽  
Electromechanical Coupling ◽  
Drive System ◽  
Current Signal ◽  
Output Current ◽  
Coupling Vibration ◽  
Current Harmonics ◽  
Electric Drive System ◽  
Frequency Harmonic

Using torque telemetry system to test the mechanical drive system of rolling mill,it is found that the torsional vibration and current signal in the electric drive system have the same obviously vibration frequency. The model of cycloconverter, synchronous motor and mechanical drive system of rolling mill are built and analysed by Matlab/Simulink and ANSYS.The simulation results show when the harmonic torque frequency and the torsional vibration natural frequency of for mechanical drive system are equal or close, the strong torsional vibration arouse It is proved that the convertor output current harmonics can induce the electromechanical coupling vibration of main mechanical drive system under the certain conditions.

Study on Electromechanical Coupling Vibration of Simulation Technology Based on the Drive System

2013 ◽  
Vol 676 ◽  
pp. 289-292 ◽  
Author(s):  
Hong Ying Wang
Keyword(s):  
Degrees Of Freedom ◽  
Electromechanical Coupling ◽  
Dynamic Performance ◽  
Drive System ◽  
Coupling Vibration ◽  
Ac Drive ◽  
Mass Damper ◽  
Coupling Factors ◽  
Vibration Simulation

Study the mechanical and electrical system,according to the mechanical system of the coupling mechanics principle, the AC drive system is simplified as many degrees of freedom "spring - mass - damper" system,the quality of construction of three two-axis system,established the two shafts electromechanical coupling vibration mathematical model; Using the electromechanical coupling vibration simulation model, the parameters of the current regulator, damping, harmonic disturbances, gap and load disturbance of electromechanical coupling factors such as vibrations caused by dynamic process.Improve the dynamic performance of the system is significant, have the great value for the parameters of the system design and fault diagnosis on this study.

Research on Main Drive System Vibration of Six-Roller Wide Strip Aluminum Cold Rolling Mill

2014 ◽  
Vol 644-650 ◽  
pp. 259-264
Author(s):  
Da Zhi Zhang ◽  
Ling Qi Meng
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Electromechanical Coupling ◽  
Harmonic Component ◽  
Oscillation Period ◽  
Drive System ◽  
Response Analysis ◽  
Cold Rolling Mill ◽  
Finite Element Software ◽  
Main Drive System

Vibration appears in the main drive system of the six-roller cold rolling mill of one plant. The oscillation frequency is 2.5 Hz. The oscillation cycle is 0.4 second. The oscillation period has nothing to do with the speed. Using the finite element software ANSYS, the low natural frequency is got through the modal analysis and harmonic response analysis based on the measured vibration data from the field. Horizontal vibration is the main vibration mode and it is the electromechanical coupling vibration. Main motor is controlled by IEGT inverter of TEMIC and the low frequency harmonic component is difficult to eliminate. AC drive trap filter is designed to dodge the 2.5 Hz frequency. The solution has achieved the recognition by the TEMIC company. The problem was solved and good results were obtained.

Optimisation of a Hybrid Energy Scavenger with Piezoelectric/Magnetic Coupling for Sensor-Bearing Units

2013 ◽  
Vol 745 ◽  
pp. 41-56 ◽  
Author(s):  
Eugenio Brusa
Keyword(s):  
Energy Conversion ◽  
Rolling Mill ◽  
Structural Damage ◽  
Electromechanical Coupling ◽  
Permanent Magnets ◽  
Piezoelectric Materials ◽  
Vibration Monitoring ◽  
Vibration Energy Harvesting ◽  
Distributed Sensors ◽  
Energy Scavenger

Vibration monitoring based on wireless distributed sensors is currently used in steelmaking plants to early detect structural damage occurring in the rolling mill components. This approach allows overcoming some severe limitations of access to those industrial equipments, but sensors need a local power supply. Vibration energy harvesting based on piezoelectric materials is therefore proposed for this purpose. Nevertheless, very often it happens that dimensions of the energy scavenger are incompatible with the size of the system, thus not allowing a perfect tuning of its resonance upon the frequency of the dynamic excitation. Moreover, sometimes the amplitude of vibration is too low to induce a sufficient amount of energy conversion. Those problems motivated a previous work of the author, about the feasibility of plucking the flexible structure through either a relative motion or rotation of the harvested system and the energy scavenger, respectively. To avoid the drawbacks due to the wear in plucking the material, a contactless electromechanical coupling was proposed. The interaction between two permanent magnets, being one applied to the scavenger tip and the other fixed, was used to excite the vibration and the electromechanical conversion through the piezoelectric layer. The effectiveness of such hybrid system composed by the structure with surface bonded piezoelectric layers and the couple of magnets was investigated and compared to the power requirements of some sensors currently used to measure the dynamic response of the backup roll bearings located at the outer crown of the rolling mill. An optimisation of the whole device to increase the overall performance is proposed by following some approaches assessed in the literature and tested on some specimens of energy scavenger. The optimisation activity was based on a suitable selection of the piezoelectric material aimed at reaching the highest electromechanical coupling with a good mechanical strength and on a suitable shaping of the electrode surface aimed at assuring the largest efficiency in the energy conversion.

scholarly journals A study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401771370 ◽  
Author(s):  
Hai Xu ◽  
Ling-Li Cui ◽  
De-Guang Shang
Keyword(s):  
Fault Diagnosis ◽  
Cold Rolling ◽  
Dynamic Characteristics ◽  
Rolling Mill ◽  
Vibration Amplitude ◽  
Strip Thickness ◽  
Drive System ◽  
Nonlinear Coupling ◽  
Cold Rolling Mill ◽  
Coupling Dynamic

The dynamic characteristics of the mill and the drive system are mutually coupled and affected closed-loop system. However, most research has considered only the vibration of the drive system or the vibration of the mill to determine the cause of the accident in the equipment condition monitoring and fault diagnosis process. Condition monitoring and fault diagnosis based on this type of approach can lead to misdiagnosis or missed diagnosis in determining faults in actual systems. So, in this study, a dynamic model of the coupling between a mill and its drive system was developed to study the interaction of the mill and the drive system with the goal of increasing the accuracy of diagnostic methods and to improve the quality of the rolled material. A nonlinear coupling dynamic model was formulated to represent the relation between the gearbox vibration amplitude and various time-varying parameters to study the effects of various parameters on the drive system vibration characteristic under unsteady lubrication. Simulations results showed that increasing the strip speed, the input strip thickness, or the output strip thickness or decreasing the lubricating oil temperature or the roller radius caused the vibration amplitude of the drive system to increase. The vibration frequency caused by variations in the strip inlet or outlet thickness can be transmitted to the drive system, and gear meshing frequency of the gearbox can be transmitted to the mill. Test data from an actual cold rolling mill verified the accuracy of the model. The model was shown to be capable of simulating the mutually coupled and affected mechanism between a mill and its drive system.

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