Composite fault diagnosis method for hydraulic AGC system

A technology of composite faults and diagnostic methods, applied in the direction of machine/structural component testing, measuring devices, instruments, etc., can solve problems such as piled steel, potential safety hazards of equipment, difficult fault isolation and positioning, etc., and achieve the effect of improving the separation rate

Active Publication Date: 2017-03-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Failure of the AGC system may destroy the normal rolling state of the entire rolling mill, and even lead to equipment safety hazards such as rolling mill vibration and serious quality accidents such as strip slipping, deviation, broken strip, and piled steel
Because the AGC system has a mul

Method used

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  • Composite fault diagnosis method for hydraulic AGC system
  • Composite fault diagnosis method for hydraulic AGC system
  • Composite fault diagnosis method for hydraulic AGC system

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Embodiment Construction

[0039] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0040] Such as figure 1 As shown, a composite fault diagnosis method of a hydraulic AGC system of the present invention first builds a simulation model of the system according to the schematic diagram of rolling mill components, and then builds a multi-signal model of the system on this basis to obtain a fault dependency matrix, including the following steps :

[0041] Step 1. Dynamic modeling of rolling mill components: Equivalent the various links of the hydraulic AGC system to obtain its mathematical model, and dynamically model the rolling mill components, as follows;

[0042] 11) If figure 2 The principle of the hydraulic system shown is equivalent to the hydraulic cyli...

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Abstract

The invention discloses a composite fault diagnosis method for a hydraulic AGC system. The method specifically comprises the following steps: S1, mill component dynamic modeling: acquiring the equivalent of each link of a hydraulic AGC system to get a mathematical model thereof; S2, system modeling: simulating a fault, selecting a measuring point, building a multi-signal model of the system, and getting a fault dependence matrix under the multi-signal model; and if the fault is a single fault, getting a fault dependence matrix directly, performing fault diagnosis, and getting a result directly; S3, if the fault is a composite fault, using a blind source separation algorithm to blindly separate measuring point information, getting a fault dependence matrix, and diagnosing the composite fault; and S4, fault diagnosis: after the system fails, getting the information of the measuring point, and locating the fault source by comparing the measuring point information with the fault dependence matrix. Through the diagnosis method of the invention, the purpose of composite fault isolation and location is achieved, and the fault separation rate is improved.

Description

technical field [0001] The invention belongs to the technical field of system fault diagnosis, and specifically refers to a compound fault diagnosis method of a hydraulic AGC system. Background technique [0002] Hydraulic AGC is a system that uses the hydraulic system of the rolling mill to control the position of the roll by adjusting the oil volume and pressure of the hydraulic cylinder through the hydraulic servo valve, thereby automatically controlling the thickness of the strip. It is worth noting that the AGC system has many frequent faults such as abnormal servo valve gain, oil pipe leakage, and displacement sensor failure. The failure of the AGC system may destroy the normal rolling state of the entire rolling mill, and even lead to equipment safety hazards such as rolling mill vibration and serious quality accidents such as strip slipping, deviation, broken strip, and stacked steel. Because the AGC system has a multiple closed-loop control structure, even a small ...

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Application Information

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IPC IPC(8): G01M99/00
CPCG01M99/00
Inventor 孟宪锋陆宁云姜斌黄丹丹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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