Journal of Power System Engineering (동력기계공학회지)
- Volume 12 Issue 1
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- Pages.72-79
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- 2008
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- 2713-8429(pISSN)
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- 2713-8437(eISSN)
Tension Modeling and Looper-Tension ILQ Servo Control of Hot Strip Finishing Mills
열간 사상압연기의 장력 연산모델과 루퍼-장력 ILQ 서보 제어
Abstract
This paper designs a looper-tension controller for mass-flow stabilization in hot strip finishing mills. By Newton's 2nd law and Hooke's law, nonlinear dynamic equations on the looper-tension system are firstly derived, and linearized by a linearization algorithm using a Taylor's series expansion. Moreover, a tension calculation model is obtained from the nonlinear dynamic equations which is called as a soft sensor of strip tension between two neighboring stands. Next, a looper-tension servo controller is designed by an ILQ(Inverse Linear Quadratic optimal control) algorithm, and it is combined with a minimal disturbance observer which to attenuate speed disturbances by AGC and operator interventions, etc.. Finally, it is shown from by a computer simulation that the proposed ILQ controller with a disturbance observer is very effective in stabilizing the strip mass-flow under some disturbances, moreover it has a good command following performance.
Keywords