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   A Proposal of the Magnetic Levitation System with Two Desired Values   [View] 
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 Author(s)   G. Uchimido; M. Watada; S. Torii; D. Ebihara 
 Abstract   High quality and high efficiently transfer of the manufactual process are required with thin steel sheets of the thickness 0.3-1.2mili-meters that is in demand the highest in the steel industry. The thin steel sheets should be transported without cracks on the surface and the unevenness of lubricating oil in the field of producing steel-ware. The non-contact transportation of thin steel sheets by magnetic levitation is one of the solutions. It is proposed in this paper that the levitation system with two desired values to prevent transverse waves from propagating along the plate. A one-side support experiment of magnetic levitation system with two desired values and independent system is tested. The experiment result prove that compared with independent system, system with two desired values can control convergence of vibration early. The vibrations of various frequencies exist on a thin steel plate during surfacing. The examination to frequency of a thin steel plate is, therefore, required. In control system with two desired values and independent control system, it is necessary to get capability that can control vibration over the frequency of the vibration on a thin steel plate. An output vibration amplitude /an input vibration amplitude (following: amplitude ratio) is a parameter of the vibration control effect. The experiment result shows the amplitude ratio is high when the frequency of the thin steel plate is high, in both cases. PID controls order these electromagnets current. The system with two desired values can set up a differentiation gain highly, therefore, vibration can be controlled rather than the independent system. The progressive wave and the reflected wave from a free end side generate standing wave. The system with two desired values can control progressive wave. The experiment prove the system with two desired values can control progressive wave more rather than the independent system on the frequency of the ranges from 3 to 72 hertz. These experiments prove the system with two desired values is more effective than the independent system. 
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Filename:EPE2001 - PP01124 - Uchimido.pdf
Filesize:176.2 KB
 Type   Members Only 
 Date   Last modified 2004-03-09 by System