A Method for Suppressing Unwinding Tension Fluctuation Based on Improved Equivalent Sliding Mode Control
A technology of fluctuation suppression and tension, applied in the direction of winding strip, thin material processing, transportation and packaging, etc., can solve the problems of unwinding tension fluctuation, difficult tension fluctuation, input chattering, etc., and achieve fast unwinding tension response. , The effect of inhibiting the time-varying curling diameter and strong inhibiting ability
Active Publication Date: 2022-07-19
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology
The unwinding system is the front-end part of the roll-to-roll manufacturing equipment. The continuous change of the coil diameter, the frequent start-stop of the system or the speed disturbance caused by acceleration and deceleration make the unwinding system have strong time-varying and nonlinear characteristics. It is easy to cause fluctuations in unwinding tension, which directly affects the processing quality of subsequent stations
The parameters of the conventional PID controller are fixed, and it is difficult to solve the problem of time-varying coil diameter and interference
Control methods such as iterative learning and neural networks have good adaptability to time-varying roll diameters, but the algorithm learning time is long, and it is difficult to meet the real-time requirements of roll-to-roll manufacturing
The sliding mode control has a fast response speed and strong robustness to external disturbances and parameter perturbations, but there is an input chattering problem, which makes it difficult to suppress tension fluctuations well
Method used
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[0087] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0088] The embodiments of the present invention are illustrated with an unwinding system in roll-to-roll manufacturing. like image 3 As shown, the unwinding roller and the pairing roller are both driving rollers, and the substrate tension T between the unwinding roller and the driving roller is regarded as the unwinding tension. The roll radius R of the unwinding roll u Continues to shrink during unwinding. The specific embodiments described herein are only used to explain the present invention, but not to limit the scope of the present invention.
[0089] The process of a method for suppressing unwinding tension fluctuations based on improved equivalent sliding mode control according to an embodiment of the present invention is shown in figure 1 .
[0090] Step 1: Take figure 2 The single-segment substrate shown between two adj...
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The invention provides a method for suppressing the fluctuation of unwinding tension based on improved equivalent sliding mode control. First, based on the dynamic analysis of the unwinding system and the time-varying winding diameter model, a model of unwinding tension and speed is established; then a saturation function is used to replace the The sliding mode controls the sign function in the reaching law. Based on this, the exponential reaching law and the power reaching law are improved respectively, and the improved sliding mode reaching law is obtained. Further, based on the unwinding tension error system and the integral sliding mode surface, the sliding mode control law when the system is stable and approaching the state origin is solved. Equivalent sliding mode control law. The invention realizes the effective weakening of buffeting vibration and the rapid suppression of the fluctuation of unwinding tension caused by time-varying winding diameter and speed disturbance.
Description
technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a method for suppressing the fluctuation of unwinding tension based on improved equivalent sliding mode control. Background technique [0002] Tension control of flexible substrates is a core issue in roll-to-roll manufacturing, and the precision and stability of tension control have a great impact on product quality. The unwinding system is the front-end part of the roll-to-roll manufacturing equipment. The continuous change of the coil diameter, the frequent start and stop of the system or the speed disturbance caused by acceleration and deceleration make the unwinding system have strong time-varying and nonlinear characteristics. It is easy to cause fluctuations in the unwinding tension, which directly affects the processing quality of the subsequent stations. The parameters of the conventional PID controller are fixed, and it is difficult to solve the p...
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IPC IPC(8): B65H23/26B65H26/04
CPCB65H23/26B65H26/04
Inventor 熊涛邹铛铛李自成王后能廖小兵曾丽
Owner WUHAN INSTITUTE OF TECHNOLOGY