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Robust fuzzy control method for hydraulic loop based on uncertain discrete model

An uncertainty, discrete model technology, applied in the field of strip rolling, can solve problems such as the inability to eliminate the steady-state error of system parameters, the robust ambiguity of hydraulic loopers, etc.

Inactive Publication Date: 2014-09-17
AUTOMATION RES & DESIGN INST OF METALLURGICAL IND
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Problems solved by technology

[0004] The purpose of the present invention is to provide a hydraulic looper robust fuzzy control method based on an uncertain discrete model to solve the problem that the existing looper control method cannot eliminate the perturbation of system parameters and external disturbances during the hot strip rolling process. The steady-state error problem of

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  • Robust fuzzy control method for hydraulic loop based on uncertain discrete model
  • Robust fuzzy control method for hydraulic loop based on uncertain discrete model
  • Robust fuzzy control method for hydraulic loop based on uncertain discrete model

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Embodiment approach

[0053] Adopt the present invention to control the looper control system below, combine figure 1 and figure 2 Illustrate implementation method of the present invention, concrete process is as follows:

[0054] Step 1: According to the existing looper dynamic equation, establish a continuous-time model of the looper control system.

[0055] The actual strip hot rolling hydraulic looper control system generally has irregular frequency spectrum disturbance and system parameter uncertainty, and it is difficult to establish an accurate mathematical model. However, most of the existing controller design methods do not consider the parameter uncertainty, so they cannot directly It is applied to the production site or the control precision is low.

[0056] The force analysis diagram of the looper device during strip rolling is as follows image 3 As shown, according to the existing looper dynamics equation, the uncertainty continuous time model of the looper control system is estab...

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Abstract

The invention discloses a robust fuzzy control method for a hydraulic loop based on an uncertain discrete model, belonging to the technical field of plate and strip rolling. The method is used for realizing high-precision and stable control on a loop control system through designing a robust fuzzy state feedback controller based on an uncertain discrete time model. An uncertain continuous time model is established according to a dynamic model of the loop control system, a proper sampling period is selected, the obtained continuous model is discretized by using a zero-order holder method, then the uncertain discrete time model of the loop control system is obtained, and a robust fuzzy controller is designed on the basis. The robust fuzzy control method for the hydraulic loop based on the uncertain discrete model has the advantage of solving the problem that the traditional loop control method can not be used for eliminating perturbation existing in system parameters and steady state errors caused by outer interference in plate and strip hot continuous rolling processes.

Description

technical field [0001] The invention belongs to the technical field of strip rolling, and in particular provides a robust fuzzy control method for a hydraulic looper based on an uncertain discrete model, which is suitable for high-precision control of a hydraulic looper control system for strip hot continuous rolling, and also It can be used for modeling and control of other complex systems such as robots, power systems, and drilling platforms. Background technique [0002] In modern hot continuous rolling process, looper control plays a very important role, and the quality of its control performance directly affects the quality of finished strip steel. There are two types of looper control systems: electric looper and hydraulic looper control system. Compared with the electric looper, the hydraulic looper has strong real-time performance and high precision, but its control is very complicated. At present, most of the domestic hydraulic looper control systems are imported ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/00
Inventor 陈金香于立业
Owner AUTOMATION RES & DESIGN INST OF METALLURGICAL IND
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