FSRBFD improved adaptive decoupling control method

Abstract

The invention discloses an FSRBFD improved adaptive decoupling control method. The method comprises the steps of S1) system modeling, in which a transfer function matrix model of a system is determined according to relation between controlling quantity and output quantity; S2) establishment of an RBFD decoupling controller, in which the RBFD decoupling controller comprises an input layer, a hidden layer and an output layer, and a decoupling control process of the RBFD decoupling controller comprises RBF initialization, RBF clustering, RBF model training and RBF test; and S3) establishment of an FSRBFD decoupling controller, in which the RBFD decoupling controller is improved by means of an additional momentum item, an adaptive learning rate and an additional differential item to establish the FSRBFD decoupling controller with adaptive learning rate. The FSRBFD decoupling controller is applied to a multichannel thickness control system to effectively solve the problem of film thickness deviation caused by coupling problems of a BOPP film production line, and further the film production quality is ensured.

Description

technical field [0001] The invention relates to the technical field of decoupling of coupling systems, in particular to an adaptive decoupling control method for improving FSRBFD. Background technique [0002] The biaxially oriented polypropylene (BOPP) film thickness control system is a multi-input multi-output (MIMO) nonlinear complex multivariable coupling system. In the actual production process, the heating bolts interact with each other, so the thermal expansion bolts Coupling cannot be ignored. [0003] Specifically, the BOPP film production line process is as follows figure 1 As shown, the working process is as follows: the film raw material (plastic particles) is put in from the feeding port, and after being heated and melted, the liquid raw material is sent to the membrane head by the extruder, extruded through the thermal expansion bolt at the lip of the membrane head, and passed through the cooling roller Cooling into a solid thick sheet, the thick sheet is con...

AI Technical Summary

Problems solved by technology

[0008] Traditional decoupling is represented by the modern frequency domain, which is mainly applicable to deterministic MIMO systems. The basic idea is to design a decoupling network so that the transfer function matrix of the MIMO control system becomes a diagonal matrix, making the system easier to control. It includes seeking Inverse matrix method, relative amplification factor matching method, diagonal dominance method, transition feedback method, etc.; because the decoupling method requires the transfer matrix to be steady-state non-singular, the structure is simple, and there is no dynamic characteristic, ensuring the output response of the open-loop system There is no deviation in the steady state, but it cannot effectively improve the decoupling adjustment ability of the closed-loop control system

[0009] Adaptive decoupling method is the combination of adaptive control and decoupling control technology. Its essence is to treat the coupling signal as interference, and adopt the method of self-correction feedforward control to compensate the coupling dynamically and statically; the similar feedforward solution Although the coupling algorithm has a good decoupling effect on the MIMO coupling system, it cannot completely eliminate the coupling effect caused by the change of the input signal.

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