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Transfer function identification method based on memetic algorithm

A kind of cultural gene algorithm and transfer function technology, which is applied in the fields of genetic model, calculation, and electrical digital data processing.

Inactive Publication Date: 2015-08-12
WUXI VOCATIONAL & TECHN COLLEGE
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  • Abstract
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  • Claims
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Problems solved by technology

So far, there have been some studies on system transfer function identification, such as genetic algorithm, iterative Prony algorithm, etc., but the models considered by these methods do not contain the system time-delay effect, and the algorithm is complex

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  • Transfer function identification method based on memetic algorithm
  • Transfer function identification method based on memetic algorithm
  • Transfer function identification method based on memetic algorithm

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Embodiment Construction

[0024] Next, through the embodiments and accompanying drawings, the present invention will be described with unique technical parts such as innovation, progress or efficacy compared with the prior art, so that those skilled in the art can realize it accordingly. It should be noted that modifications and changes made by those skilled in the art without departing from the spirit of the present invention will not depart from the scope of protection of the present invention.

[0025] A continuous-time dynamic system can generally be described by high-order differential equations, which can be converted into transfer functions by Laplace transform. If the transfer operator G(s) is used to represent the linear system model, u(t) represents the system input, and y(t) represents the system output, in the triple {u(t),y(t),G(s)} In , assuming that the system output u(t) and output y(t) are known, the system identification theory can be used to determine the relevant system mathematical...

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Abstract

The invention discloses a transfer function identification method based on a memetic algorithm. The method includes the steps of generation of data, encoding, generation of an initial group, crossover, mutation, calculation of fitness functions, selection, local search and judgment of whether a stop condition is met. The method combines the breadth advantage of a group search algorithm and the depth advantage of a local search algorithm, a transfer function output response error is used as an evaluation function for algorithm optimization, the diversity of particles is improved through crossover and mutation of individuals, the optimal parameter of a transfer function is determined through the minimum evaluation function, and then the system transfer function fit with experimental data is obtained through speculation.

Description

technical field [0001] The invention relates to the fields of control systems and intelligent optimization, in particular to a transfer function identification technology based on a cultural gene algorithm. Background technique [0002] In engineering applications, quite a few industrial processes can be described by time-delay or time-delay transfer functions. Many control algorithms, such as PID algorithm in process control, are also designed based on the transfer function of the system. The synthesis of the control system is closely related to whether the identification of the system model is reasonable or not, so the identification of the system transfer function is very important, and the identification of the transfer function is generally obtained based on the experimental data obtained from the test. So far, there have been some studies on system transfer function identification, such as genetic algorithm, iterative Prony algorithm, etc., but the models considered b...

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Application Information

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IPC IPC(8): G06F19/00G06N3/12
Inventor 叶倩刘全胜
Owner WUXI VOCATIONAL & TECHN COLLEGE
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