CN108594676A - A kind of industry controlled process characteristic parameter Fast Identification Method - Google Patents
A kind of industry controlled process characteristic parameter Fast Identification Method Download PDFInfo
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- CN108594676A CN108594676A CN201810296113.9A CN201810296113A CN108594676A CN 108594676 A CN108594676 A CN 108594676A CN 201810296113 A CN201810296113 A CN 201810296113A CN 108594676 A CN108594676 A CN 108594676A
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Abstract
A kind of industrial controlled process characteristic parameter Fast Identification Method of disclosure of the invention, step 1：Using the dynamic characteristic of open-loop gain K, time constant T and tri- industrial controlled processes of characteristic parameter description of delay time L；Step 2：The step signal for applying constant amplitude to industrial controlled process, obtains the sample information output valve y (t) of its step response；Step 3：Calculate separately gained y (t), y2(t) and y3(t) corresponding accumulated value A1、A2And A3；Step 4：The accumulated value A being calculated according to the sample information output valve y (t) of step 2 acquisition, step 31、A2、A3, run time t and sampling period Δ t, calculate three characteristic parameters of industrial controlled process.The present invention only need give industrial controlled process apply step signal so that during system modelling, industrial controlled process can even running, after stable, required data, which just acquire, to be terminated；The algorithms of three characteristic parameters is simple, calculation amount is small, of less demanding to the computing capability of industrial control unit (ICU).
Description
Technical field
The present invention relates to a kind of industrial controlled process characteristic parameter Fast Identification Methods, belong to system modelling field.
Background technology
Mathematical model of the design of industrial control system dependent on controlled process.And the dynamic of most of industrial process is special
Property, it can be with time lag of first order model come approximate description.
But the input signal that common system modeling method requirement applies must satisfy the condition of " Persistent Excitation "；It is terrible
To enough data, system must run longer time；In addition the calculation amount of parameter is also bigger, is brought to engineer application
Inconvenience.If can reduce " Persistent Excitation " of input signal is required, the computational methods of reduced parameter, shorten system fortune
The row time, then great convenience will be brought to engineer application.
Invention content
The present invention proposes a kind of industrial controlled process characteristic parameter Fast Identification Method, is rung based on industrial controlled process step
It answers, can rapidly obtain the characteristic parameter of industrial controlled process.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of industry controlled process characteristic parameter Fast Identification Method, this approach includes the following steps：
Step 1：It is controlled that common industrial is described using open-loop gain K, time constant T and tri- characteristic parameters of delay time L
The dynamic characteristic of process；
Step 2：The step signal for applying constant amplitude to industrial controlled process, is denoted as r (t), is acquired with sampling period Δ t
The output valve of the industry controlled process is denoted as y (t), and wherein t is run time, and unit is the second；
Step 3：Calculate the quadratic power y of y (t)2(t) and the cube y of y (t)3(t), and gained y (t), y are calculated separately2
(t) and y3(t) corresponding accumulated value A1, A2 and A3；
Step 4：The accumulated value A being calculated according to the output valve y (t) of step 2 acquisition, step 31、A2、A3, run time
T and sampling period Δ t, calculates three characteristic parameters of industrial controlled process, including open-loop gain K, time constant T and prolongs
Slow time L, wherein the unit of time constant T and delay time L are the second.
Preferably, industrial controlled process is described using formula (1)：
In formula (1), K is open-loop gain, and T is time constant, and L is delay time, and r (t) is the defeated of industrial controlled process
Enter signal, y (t) is the output valve of industrial controlled process, and t is run time；
It is r (t)=R to remember that the industrial process applies the step signal that amplitude is R, and the industry is acquired with sampling period Δ t
The output valve y (t) of controlled process, and y (t), y are calculated according to formula (2)2(t) and y3(t) corresponding accumulated value A1、A2With
A3, wherein formula (2) is as follows：
Preferably, when industrial controlled process is under the step signal effect that amplitude is R, output is when reaching stable state, open loop
Gain K, time constant T and delay time L are calculated by formula (3)：
Advantageous effect：Compared with prior art, the present invention provides a kind of industrial controlled process characteristic parameter Fast Identification side
Method, it is only necessary to give industrial process apply step signal so that during system modelling, industrial process can even running, work as fortune
After row is stablized, required data, which just acquire, to be terminated；The algorithms of three characteristic parameters is simple, calculation amount is small, to industrial control unit (ICU)
Computing capability it is of less demanding.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below to the embodiment of the present application
In technical solution be clearly and completely described, it is clear that described embodiments are only a part of embodiments of the present application,
Instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present application.
A kind of industry controlled process characteristic parameter Fast Identification Method, this approach includes the following steps：
Step 1：Using open-loop gain K, time constant T and tri- industrial controlled processes of characteristic parameter description of delay time L
Dynamic characteristic, as shown in formula (1)：
In formula (1), K is open-loop gain, and T is time constant, and L is delay time, and r (t) is the defeated of industrial controlled process
Enter signal, y (t) is the output valve of industrial controlled process, and t is run time；
Step 2：It allows controlled industrial process to be in zero original state, applies in the control signal input of industrial controlled process
Amplitude is the step signal of steady state value R, is denoted as r (t)=R, the steady operation width for being preferably sized to industrial controlled process of amplitude R
Value.In industrial controlled process operational process, the output response y (t) of the industry controlled process is acquired with sampling period Δ t；
Step 3：Y (t), y are calculated according to formula (2)2(t) and y3(t) corresponding accumulated value A1、A2And A3, wherein public
Formula (2) is as follows：
Step 4：When industrial controlled process is under step signal r (t) effects, (i.e. y (t) sizes are not when output reaches stable state
Change again), the accumulated value A being calculated according to the sample information y (t) of step 2 acquisition, step 31、A2、A3, execute time t with
And sampling period Δ t, three characteristic parameters of industrial controlled process, including open-loop gain K, time are calculated in conjunction with formula (3)
Constant T and delay time L, formula (3) are as follows：
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Two kinds of modifications of these embodiments will be apparent to those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (3)
1. a kind of industry controlled process characteristic parameter Fast Identification Method, it is characterised in that：This approach includes the following steps：
Step 1：Common industrial controlled process is described using open-loop gain K, time constant T and tri- characteristic parameters of delay time L
Dynamic characteristic；
Step 2：The step signal for applying constant amplitude to industrial controlled process, is denoted as r (t), the work is acquired with sampling period Δ t
The output valve of industry controlled process is denoted as y (t), and wherein t is run time, and unit is the second；
Step 3：Calculate the quadratic power y of y (t)2(t) and the cube y of y (t)3(t), and gained y (t), y are calculated separately2(t) and y3
(t) corresponding accumulated value A1、A2And A3；
Step 4：The accumulated value A being calculated according to the output valve y (t) of step 2 acquisition, step 31、A2、A3, run time t with
And sampling period Δ t, calculate three characteristic parameters of industrial controlled process, including open-loop gain K, time constant T and delay
Time L, wherein the unit of time constant T and delay time L are the second.
2. a kind of industrial controlled process characteristic parameter Fast Identification Method according to claim 1, it is characterised in that：Industry
Controlled process is described using formula (1)：
In formula (1), K is open-loop gain, and T is time constant, and L is delay time, and r (t) is the input letter of industrial controlled process
Number, y (t) is the output valve of industrial controlled process, and t is run time；
It is r (t)=R to remember that the industrial process applies the step signal that amplitude is R, and it is controlled to acquire the industry with sampling period Δ t
The output valve y (t) of process, and y (t), y are calculated according to formula (2)2(t) and y3(t) corresponding accumulated value A1、A2And A3,
Middle formula (2) is as follows：
3. a kind of industrial controlled process characteristic parameter Fast Identification Method according to claim 1, it is characterised in that：Work as work
Industry controlled process is under the step signal effect that amplitude is R, and output is when reaching stable state, open-loop gain K, time constant T and prolongs
Slow time L is calculated by formula (3)：
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