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Transfer function model identification method with differential characteristic process

A technology of transfer function and model identification, applied in the direction of complex mathematical operations, etc., to achieve the effect of simple calculation process and convenient engineering application

Active Publication Date: 2018-06-15
SOUTHEAST UNIV
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Problems solved by technology

However, how to determine and calculate the appropriate characteristic parameters according to the step response curve of the process with differential characteristics, and then obtain the corresponding transfer function model of the process, there is no public method report so far.

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  • Transfer function model identification method with differential characteristic process
  • Transfer function model identification method with differential characteristic process
  • Transfer function model identification method with differential characteristic process

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Embodiment Construction

[0022] In order to describe the technical solution disclosed in the present invention in detail, further elaboration will be made below in conjunction with the accompanying drawings and specific embodiments.

[0023] Suppose the transfer function of the process to be identified is The identification process of the model is as follows:

[0024] Step 1: Conduct on-site dynamic characteristic test. Under steady-state conditions, the process input u steps change Δu, and take T seconds as the sampling period, that is, under the condition that the process input u and process output y remain stable, record steady state value y of y 0 , and the u step change Δu, collect the data y'(k) of the process output y at each sampling time, subtract the steady-state value of y before the process input u step change from y'(k), and obtain the process step Jump response data sequence y(k), wherein k is the sampling moment, k=1, 2, ..., N, N is the number of sampled data, satisfying that N*T is...

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Abstract

The invention discloses a transfer function model identification method with a differential characteristic process. According to the method, first, step response dynamic characteristic test data of the process is acquired through a field test; second, three characteristic parameters of a step response curve of the process are calculated according to the test data, wherein the three characteristicparameters include time T<0> corresponding to an extreme point of the curve, a corresponding extreme value K<m> and time T<q> corresponding to an inflection point of the curve before the moment T<0>;and last, according to the characteristic parameters T<q>, T<0> and K<m>, parameters of a process transfer function model (shown in the description) are calculated, wherein the parameters include a transfer coefficient K, a time constant T<c> and an order n. The method is simple and easy to implement and brings convenience to engineering application.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a transfer function model identification method with a differential characteristic process. Background technique [0002] In industrial processes, there is a class of processes with differential properties whose dynamics can be The transfer function description of the structure, where n is the model order, T c is the time constant, and K is the model transfer coefficient, for example, in a thermal power generation unit, the opening of the steam turbine is used as the input and the generated power is the output. Obtaining the corresponding transfer function from the process step response curve is a commonly used model identification method in engineering. But how to determine and calculate the appropriate characteristic parameters according to the step response curve of the process with differential characteristics, and then obtain the transfer function mo...

Claims

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Application Information

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IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 雎刚邵恩泽
Owner SOUTHEAST UNIV
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