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Non-linear oscillation detection method based on improved adaptive frequency modulation mode decomposition

A technology of nonlinear oscillation and mode decomposition, applied in the direction of adaptive control, control/adjustment system, instrument, etc., can solve problems such as impact, difficulty in estimating noise energy, etc., with strong ability, good effect, and complete theoretical foundation Effect

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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Problems solved by technology

However, the stop condition of the basic adaptive FM mode decomposition is based on the energy ratio of the residual signal to the original signal, so the stop condition is greatly affected by the noise energy, which needs to be adjusted according to the noise energy in practical applications, but the estimated Noise energy is a difficult thing

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  • Non-linear oscillation detection method based on improved adaptive frequency modulation mode decomposition
  • Non-linear oscillation detection method based on improved adaptive frequency modulation mode decomposition
  • Non-linear oscillation detection method based on improved adaptive frequency modulation mode decomposition

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Embodiment Construction

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.

[0043] The following takes a chemical flow control loop as an example to describe in detail the nonlinear oscillation detection method of a chemical process with valve stickiness. For this loop, it is known a priori that the system has nonlinear oscillations caused by valve viscosity, and the data comes from "Jelali M, Huang B. Detection and Diagnosis of Stiction in Control Loops: State of the Art and Advanced Methods [M] .Springer London,2009."The 23rd chemical loop in the book, chemical.loop23.PV.

[0044] Such as figure 1 As shown, a nonlinear oscillation detection method based on improved adaptive frequency modulation mode decomposition, including:

[0045] Step 1, collect the process outp...

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Abstract

The invention discloses a non-linear oscillation detection method based on improved adaptive frequency modulation mode decomposition. The method comprises the steps of: (1) collecting a loop output signal of an industrial process to be detected; (2) decomposing the signal by using an improved adaptive frequency modulation mode decomposition method; (3) calculating a mean value of the instantaneousfrequency of each decomposition mode; (4) using the mean value of the instantaneous frequency of the mode with the largest normalized correlation coefficient as the basic frequency; (5) calculating aconfidence interval upper limit and a confidence interval lower limit of all other modules in addition to the mode corresponding to the current basic frequency; and (6) judging whether there is an integer multiple of the fundamental frequency in the confidence interval, if so, deeming that the oscillation belongs to non-linear oscillation; and if not, using the mean value of the instantaneous frequency of the mode with the second largest normalized correlation coefficient as the basic frequency, and repeating the steps (4) to (6). By using the non-linear oscillation detection method disclosedby the invention, the accuracy and reliability of non-linear detection of the control loop of the industrial process can be improved.

Description

technical field [0001] The invention belongs to the field of performance evaluation and fault diagnosis in industrial control systems, in particular to a nonlinear oscillation detection method based on improved self-adaptive frequency modulation mode decomposition. Background technique [0002] With the rapid development of fault diagnosis and performance evaluation technology of industrial control loops, oscillation detection has become one of the main tasks of fault diagnosis of control loops. Oscillations generated in one loop usually propagate to other loops due to the connections and couplings between control system loops. These oscillations cause problems such as energy loss, wasted raw material and reduced product quality. Valve stickiness, controller imbalance, and external disturbances are the three main causes of oscillations. [0003] It has been pointed out in the literature that the nonlinear links in the control system, such as valve viscosity, may be the mai...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 谢磊陈启明江成龙苏宏业
Owner ZHEJIANG UNIV
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