CN106054616A - Titanium tape reel continuous pickling loop sleeve height control method for fuzzy logic optimizing PID controller parameters - Google Patents
Titanium tape reel continuous pickling loop sleeve height control method for fuzzy logic optimizing PID controller parameters Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000010936 titanium Substances 0.000 title claims abstract description 24
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 21
- 238000005554 pickling Methods 0.000 title abstract 4
- 238000013461 design Methods 0.000 claims abstract description 12
- 230000004044 response Effects 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims description 18
- 238000005406 washing Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 8
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- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 230000001133 acceleration Effects 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 230000001052 transient effect Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000036962 time dependent Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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Abstract
The invention relates to a titanium tape reel continuous pickling loop sleeve height control method for fuzzy logic optimizing PID controller parameters, which belongs to the field of metallurgical engineering control. The control method comprises the following steps: firstly designing a PID controller for a titanium plate tape continuous pickling loop sleeve height; when the transient response curve of an object is stable within the control precision, obtaining the parameters of a fuzzy controller parameters according to the P, I, D parameter values at this time so as to design the fuzzy controller; when the loop height is within the allowable error accuracy range, keeping the the fuzzy PID controller parameters at the previous time unchanged; and when the loop height is out of the accuracy range, recalculating the fuzzy controller parameter values. According to the invention, it is possible to quickly design the parameters of a fuzzy logic optimizing PID controller and fully utilizes the mature parameter adjustment method of a traditional PID controller, which simplifies the complexity of the fuzzy logic optimizing PID controller design and can realize the accurate control of loop height during continuous pickling of a titanium plate.
Description
Technical field
The present invention relates to the titanium strip coil continuous acid-washing looper height control method of fuzzy logic PID controller parameter,
Belong to metallurgical engineering and control technical field.
Background technology
Conventional PID controllers simple in construction, controls error and has robustness and the beneficially advantage such as realization, quilt process model
It is widely used in the industrial process control field such as metallurgy, petrochemical industry, building materials, electric power.Along with process units complicates and product matter
The raising that amount requires, the complexity of controlled process constantly deepens, particularly with seriality, time-varying, have noise unstable
Complication system, traditional PID control cannot meet the requirement controlling target precision.Based on universal approximation property theory adaptive
The self-adaptive fuzzy algorithm combined with fuzzy control should be controlled, there is any approximation capability to nonlinear function and self study
Ability, it is possible to obtain the structure of system, parameter, uncertain and non-linear by the learning process of self, and obtain system institute
The control law needed, is widely used at control field.Fuzzy controller is due to the non-linear of its essence and to mould
Type not dependent, PID based on fuzzy self-adaption controls change for uncertain system and object parameters and have time lag
Controlled system, all show the strongest adaptability and robustness.Conventional fuzzy controller is the most all dependent on expert
Experience be designed, this brings much inconvenience to the application of fuzzy controller.The solution of further investigation fuzzy controller
Analysis structure shows, this controller is the gamma controller of a kind of variable-gain, and has a lot of similarity with PID controller.Though
So combine both and fuzzy has been carried out substantial amounts of research, but these researchs the most do not provide the adjustment of Fuzzy Controller Parameters
Method.Propose the method for adjustment of Fuzzy Controller Parameters based on PID, it directly influence fuzzy control design efficiency,
Design complexities, is one of the Industry Control problem most critical factor determined.The present invention proposes based on traditional PID control method,
The method that can be adaptively adjusted fuzzy controller parameter.
Summary of the invention
The invention provides the titanium strip coil continuous acid-washing looper height control side of fuzzy logic PID controller parameter
Method, cannot meet the state modulator precision requirement of complex object for conventional PID controllers, reduces fuzzy controller and sets
The complexity of meter, and avoid expert's dependency of fuzzy controller parameter designing, it is achieved simple, the increasing of Industry Control upgrading
Value.
The technical scheme is that the titanium strip coil continuous acid-washing looper height of fuzzy logic PID controller parameter
Control method, uses traditional method to design the PID controller of titanium strip continuous acid-washing looper height, then adjusts according to a conventional method
P, I, D control parameter;Secondly, when Object transition Process response curve stable in the range of control accuracy time, according to P now,
I, D parameter value obtains the parameter value of fuzzy controller, thus designs fuzzy controller.Then, when looper height is in permission
Within the scope of error precision, the value keeping previous moment fuzzy controller parameter is constant, and otherwise, looper height is at precision model
Outside enclosing, recalculate the value of Fuzzy Controller Parameters.
Systematic steady state error can be eliminated respectively according to PI controller and PD controller, accelerate response speed, and avoid obscuring
Controller complexity of the calculation.Use PI fuzzy controller and the PD Fuzzy Control of two input quantities (output error, error change)
Two fuzzy sub-controller superpositions of device processed determine the control action of fuzzy controller.In conjunction with conventional PID controllers
There is highly developed parameter regulation means, it is achieved that the self-adaptative adjustment of fuzzy controller;
The concrete step of the titanium strip coil continuous acid-washing looper height control method of described fuzzy logic PID controller parameter
Rapid as follows:
Step1, first one titanium strip continuous acid-washing looper height PID controller of design, and use Ziegler-Nichols
Method adjusts P, I, D parameter of PID controller, respectively obtains the proportional gain K of PID controllerp, storage gain KiIncrease with differential
Benefit Kd, then calculate each term coefficient of increment type discrete type PID controller
Wherein,It is the gain system of the current sample time of increment type discrete type PID controller respectively
The gain coefficient of the 1st sampling instant several, front, the gain coefficient of front 2nd sampling instant;
Step2, set up Fuzzy Self-adaptive PID, obtain four parameters K of Fuzzy Self-adaptive PIDe、Kde、
KPI、KPDValue;This controller is made up of two parts: one is traditional PID controller, for directly bearing controlled device
Feedback control, and realize the on-line tuning of tri-parameters of P, I, D;Two is fuzzy logic PID controller, and this fuzzy logic is excellent
Changing PID controller to be made up of PI Fuzzy controller and PD Fuzzy controller respectively, both uses the two single outputs of input, often
Individual input variable has " just " and " bearing " two fuzzy values, and output variable has " just ", " bearing " and " zero " three fuzzy values;
Wherein, Ke、Kde、KPI、KPDRepresent that kink output height adds with deviation variation rate, the change of error of expected value respectively
Speed, the output gain of PI Fuzzy controller, the output gain of PI Fuzzy controller;
Step3, self adaptation, control in real time;After Step1 Yu Step2, obtain the fuzzy self-adaption under limit
Four parameter values of PID controller, it is ensured that identical with PID controller performance, next further according to closed loop system during its stable state
Response curve fine setting four parameters to reach desired performance;
Look first at the closed-loop response curve of Fuzzy Self-adaptive PID, estimate its overshoot, big according to overshoot
Little the most rightIt is adjusted, such vernier control device parameter, until the response curve of closed loop system reaches
Expected performance;If outside the range of error of looper height, circulation carries out step Step1~Step2, if in range of error
In, the value keeping the Fuzzy Self-adaptive PID parameter of previous moment is constant.
Wherein,Represent three parameters of incremental fuzzy self-adaptive PID controller respectively, correspond to
The K of conventional PID controllersp、KiAnd KdThree coefficients, respectively represent incremental fuzzy self-adaptive PID controller proportional gain,
Storage gain and the differential gain.
In described step Step1, PID controller is increment type discrete type PID controller, and its increment expression formula is:
In formula
In formulaIt is the gain system of the current sample time of increment type discrete type PID controller respectively
The gain coefficient of the 1st sampling instant several, front, the gain coefficient of front 2nd sampling instant;E (k) is the control deviation of PID controller;
Kp、KiAnd KdIt is the proportional gain of PID controller, storage gain and the differential gain respectively;Ti、TdAnd TsBe respectively the time of integration,
Derivative time and sampling;
In described step Step2, the increment expression formula of PI Fuzzy controller is:
Wherein,
In like manner, the increment expression formula of PD Fuzzy controller is:
To sum up, the increment expression formula of fuzzy logic PID controller is:
In formula,
Make fuzzy logic PID controller equal with PID controller respective items coefficient, i.e. have fuzzy control during stable state
Device parameter and pid parameter correspondent equal,
Meanwhile, when membership function parameter L=1, consider further that input variable tries one's best in region [-1,1] × [-1,1], institute
With, KeSelection should meet
(ysp-y0)·Ke=1 (11)
By (10) and (11) formula, parameter K of fuzzy logic PID controller can be tried to achievee、Kde、KPI、KPD;
Wherein, Δ UF-PIK () is the increment output of PI type Fuzzy type controller, Δ UF-PDK () is the increasing of the fuzzy PD type controller
Amount output, Δ UF-PIDK () is the increment output of fuzzy logic PID controller, yspIt is output high expectations value, y0It is output
Height value, other parameter implications are the same.
The invention has the beneficial effects as follows: the present invention can quickly design the parameter of fuzzy logic PID controller, fills
Dividing utilizes conventional PID controllers to have highly developed parameter regulation means, simplifies fuzzy logic PID controller
The complexity of design, can realize the accurate control of looper height during continuous acid-washing of titanium strip.
Accompanying drawing explanation
Fig. 1 is the Fuzzy Adaptive PID Control structure chart in the present invention;
Fig. 2 is the membership function figure of input/output variable of the present invention;
Fig. 3 is that the inventive method has the conventional PID controllers of noise time-dependent system to titanium strip acid cleaning loop height
Control result figure;
Fig. 4 is that titanium strip acid cleaning loop height is had the fuzzy logic of noise factor to optimize PID control by the inventive method
The control result figure of device;
Fig. 5 is the inventive method control result figure to the fuzzy logic PID controller of noise free system.
Detailed description of the invention
Embodiment 1: as Figure 1-4, the titanium strip coil continuous acid-washing looper height of fuzzy logic PID controller parameter
Control method, specifically comprising the following steps that of described method
Step1, first one titanium strip continuous acid-washing looper height PID controller of design, and use Ziegler-Nichols
Method adjusts P, I, D parameter of PID controller, respectively obtains the proportional gain K of PID controllerp, storage gain KiIncrease with differential
Benefit Kd, then calculate each term coefficient of increment type discrete type PID controller
Wherein,It is the gain system of the current sample time of increment type discrete type PID controller respectively
The gain coefficient of the 1st sampling instant several, front, the gain coefficient of front 2nd sampling instant;
Step2, set up Fuzzy Self-adaptive PID, obtain four parameters K of Fuzzy Self-adaptive PIDe、Kde、
KPI、KPDValue;This controller is made up of two parts: one is traditional PID controller, for directly bearing controlled device
Feedback control, and realize the on-line tuning of tri-parameters of P, I, D;Two is fuzzy logic PID controller, and this fuzzy logic is excellent
Changing PID controller to be made up of PI Fuzzy controller and PD Fuzzy controller respectively, both uses the two single outputs of input, often
Individual input variable has " just " and " bearing " two fuzzy values, and output variable has " just ", " bearing " and " zero " three fuzzy values;
Wherein, Ke、Kde、KPI、KPDRepresent that kink output height adds with deviation variation rate, the change of error of expected value respectively
Speed, the output gain of PI Fuzzy controller, the output gain of PI Fuzzy controller;
Step3, self adaptation, control in real time;After Step1 Yu Step2, obtain the fuzzy self-adaption under limit
Four parameter values of PID controller, it is ensured that identical with PID controller performance, next further according to closed loop system during its stable state
Response curve fine setting four parameters to reach desired performance;
Look first at the closed-loop response curve of Fuzzy Self-adaptive PID, estimate its overshoot, big according to overshoot
Little the most rightIt is adjusted, such vernier control device parameter, until the response curve of closed loop system reaches
Expected performance;If outside the range of error of looper height, circulation carries out step Step1~Step2, if in range of error
In, the value keeping the Fuzzy Self-adaptive PID parameter of previous moment is constant.
Wherein,Represent three parameters of incremental fuzzy self-adaptive PID controller respectively, correspond to
The K of conventional PID controllersp、KiAnd KdThree coefficients;
In described step Step1, PID controller is increment type discrete type PID controller, and its increment expression formula is:
In formula
In formulaIt is the gain system of the current sample time of increment type discrete type PID controller respectively
The gain coefficient of the 1st sampling instant several, front, the gain coefficient of front 2nd sampling instant;E (k) is the control deviation of PID controller;
Kp、KiAnd KdIt is the proportional gain of PID controller, storage gain and the differential gain respectively;Ti、TdAnd TsBe respectively the time of integration,
Derivative time and sampling;
In described step Step2, the increment expression formula of PI Fuzzy controller is:
Wherein,
In like manner, the increment expression formula of PD Fuzzy controller is:
To sum up, the increment expression formula of fuzzy logic PID controller is:
In formula,
Make fuzzy logic PID controller equal with PID controller respective items coefficient, i.e. have fuzzy control during stable state
Device parameter and pid parameter correspondent equal,
Meanwhile, when membership function parameter L=1, consider further that input variable tries one's best in region [-1,1] × [-1,1], institute
With, KeSelection should meet
(ysp-y0)·Ke=1 (11)
By (10) and (11) formula, parameter K of fuzzy logic PID controller can be tried to achievee、Kde、KPI、KPD;
Wherein, Δ UF-PIK () is the increment output of PI type Fuzzy type controller, Δ UF-PDK () is the increasing of the fuzzy PD type controller
Amount output, Δ UF-PIDK () is the increment output of fuzzy logic PID controller, yspIt is output high expectations value, y0It is output
Height value, other parameter implications are the same.
In fuzzy logic PID controller, two sub-controllers all use two input list outputs, it is assumed that each of which is defeated
Entering variable and have two fuzzy values " just " and " bearing ", its output variable has three fuzzy values " just ", " bearing " and " zero ", inputs, exports
Variable membership degree function is as shown in Figure 2.
The present invention utilizes MATLAB environment, with the titanium strip continuous acid-washing looper height control system of Yunnan Tai Ye company
Actual parameter, the transmission function deriving controlled device is G (s)=0.58/ (0.04s × 0.036s+1).It practice, this system
It is time-dependent system, meanwhile, in acid cleaning process, often along with various interference.Utilize Fuzzy Logic Toolbox workbox
Devise fuzzy controller, use step signal that looper height control system has been carried out regulatory PID control and fuzzy self-adaption
The emulation experiment of Tuning PID Controller compares.Initial value y0=0, looper height setting value ysp=1.With traditional PI D method for designing, control
Making its parameter value is: Kp0=5.46, the T time of integrationi0=86 and T derivative timed0=4.And then the parameter of (10) formula can be calculated It is made to be respectively equal to each parameter of (6) formula fuzzy controller during stable state
(the sampling instant k in (6) formula takes infinite, i.e. arrives stable state), in conjunction with (11) formula, can obtain each parameter of fuzzy control respectively
Value is Ke=1, Kde=0.5975, KPI=1.3509, KPD=24.015.Sampling time is 1ms, some companion of each sampling time
With this system add amplitude be δ=± 3.0 within random noise disturbance, PID controls to ring with fuzzy control simulation closed loop
Should result as shown in Figure 3-Figure 5.
From figure 3, it can be seen that conventional PID controller to having noise, time-dependent system is uncontrollable.Can from Fig. 4
Going out, fuzzy logic optimizes PID and controls constantly adjusting systematic error, makes Control performance standard optimization, and fuzzy logic optimizes PID control
Device processed for the titanium this time-dependent system with random noise of strip continuous acid-washing looper height, looper height error energy
Control below 5%, it is possible to reach preferably to control effect.As can be seen from Figure 5, if system is noise free system, obscures and patrol
The Control performance standard collecting PID controller is more excellent, controls effect more preferable.
Above in conjunction with accompanying drawing, the detailed description of the invention of the present invention is explained in detail, but the present invention is not limited to above-mentioned
Embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to before without departing from present inventive concept
Put that various changes can be made.
Claims (2)
1. the titanium strip coil continuous acid-washing looper height control method of fuzzy logic PID controller parameter, it is characterised in that: institute
State specifically comprising the following steps that of method
Step1, first one titanium strip continuous acid-washing looper height PID controller of design, and use Ziegler-Nichols method
Adjust P, I, D parameter of PID controller, respectively obtain the proportional gain K of PID controllerp, storage gain KiWith differential gain Kd,
Calculate each term coefficient of increment type discrete type PID controller again
Wherein,It is the gain coefficient of the current sample time of increment type discrete type PID controller, front respectively
The gain coefficient of the 1st sampling instant, the gain coefficient of front 2nd sampling instant;
Step2, set up Fuzzy Self-adaptive PID, obtain four parameters K of Fuzzy Self-adaptive PIDe、Kde、KPI、
KPDValue;This controller is made up of two parts: one is traditional PID controller, for directly controlled device being carried out negative feedback
Control, and realize the on-line tuning of tri-parameters of P, I, D;Two is fuzzy logic PID controller, and this fuzzy logic optimizes
PID controller is made up of PI Fuzzy controller and PD Fuzzy controller respectively, and both uses the two single outputs of input, each
Input variable has " just " and " bearing " two fuzzy values, and output variable has " just ", " bearing " and " zero " three fuzzy values;
Wherein, Ke、Kde、KPI、KPDRepresent respectively kink output height and the deviation variation rate of expected value, change of error acceleration,
The output gain of PI Fuzzy controller, the output gain of PI Fuzzy controller;
Step3, self adaptation, control in real time;After Step1 Yu Step2, obtain the Fuzzy Adaptive PID control under limit
Four parameter values of device processed, it is ensured that identical with PID controller performance during its stable state, next further according to the response of closed loop system
Curve four parameters of fine setting are to reach desired performance;
Looking first at the closed-loop response curve of Fuzzy Self-adaptive PID, estimate its overshoot, the size according to overshoot is anti-
Multiple rightIt is adjusted, such vernier control device parameter, until the response curve of closed loop system reaches expectation
Performance;If outside the range of error of looper height, circulation carries out step Step1~Step2, if in range of error,
The value keeping the Fuzzy Self-adaptive PID parameter of previous moment is constant;
Wherein,Respectively represent the proportional gain of incremental fuzzy self-adaptive PID controller, storage gain and
The differential gain.
The titanium strip coil continuous acid-washing looper height control of fuzzy logic PID controller parameter the most according to claim 1
Method processed, it is characterised in that: in described step Step1, PID controller is increment type discrete type PID controller, and its increment is expressed
Formula is:
In formula
In formulaBe respectively the gain coefficient of the current sample time of increment type discrete type PID controller, front
The gain coefficient of 1 sampling instant, the gain coefficient of front 2nd sampling instant;E (k) is the control deviation of PID controller;Kp、KiWith
KdIt is the proportional gain of PID controller, storage gain and the differential gain respectively;Ti、TdAnd TsWhen being the time of integration, differential respectively
Between and sampling;
In described step Step2, the increment expression formula of PI Fuzzy controller is:
Wherein,
In like manner, the increment expression formula of PD Fuzzy controller is:
To sum up, the increment expression formula of fuzzy logic PID controller is:
In formula,
Make fuzzy logic PID controller equal with PID controller respective items coefficient, i.e. have fuzzy controller ginseng during stable state
Number and pid parameter correspondent equal,
Meanwhile, when membership function parameter L=1, consider further that input variable tries one's best in region [-1,1] × [-1,1], so, Ke
Selection should meet
(ysp-y0)·Ke=1 (11)
By (10) and (11) formula, parameter K of fuzzy logic PID controller can be tried to achievee、Kde、KPI、KPD;
Wherein, Δ UF-PIK () is the increment output of PI type Fuzzy type controller, Δ UF-PDK () is that the increment of the fuzzy PD type controller is defeated
Go out, Δ UF-PIDK () is the increment output of fuzzy logic PID controller, yspIt is output high expectations value, y0It it is output height
Value, other parameter implications are the same.
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Cited By (4)
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CN108832853A (en) * | 2018-06-20 | 2018-11-16 | 长春工业大学 | A kind of DC brushless motor speed regulating method based on fuzzy PI-PD control |
CN112051727A (en) * | 2020-08-14 | 2020-12-08 | 陕西千山航空电子有限责任公司 | Variable structure control algorithm |
CN113050418A (en) * | 2021-03-02 | 2021-06-29 | 山东罗滨逊物流有限公司 | Adaptive gain scheduling artificial intelligence control method |
CN113110127A (en) * | 2021-03-16 | 2021-07-13 | 西安交通大学 | Artificial auxiliary intelligent industrial controller |
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CN1858666A (en) * | 2005-05-20 | 2006-11-08 | 鞍钢新轧钢股份有限公司 | Control method for acid washing and edge cutting of super low carbon soft steel |
CN103823370A (en) * | 2014-01-24 | 2014-05-28 | 广州市精源电子设备有限公司 | Self-adaptive control method for micro-arc oxidation process and system |
EP2937747A1 (en) * | 2014-04-24 | 2015-10-28 | Siemens Aktiengesellschaft | Optimisation of a sequence of strips to be pickled, by modelling a pickling line |
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CN1858666A (en) * | 2005-05-20 | 2006-11-08 | 鞍钢新轧钢股份有限公司 | Control method for acid washing and edge cutting of super low carbon soft steel |
CN103823370A (en) * | 2014-01-24 | 2014-05-28 | 广州市精源电子设备有限公司 | Self-adaptive control method for micro-arc oxidation process and system |
EP2937747A1 (en) * | 2014-04-24 | 2015-10-28 | Siemens Aktiengesellschaft | Optimisation of a sequence of strips to be pickled, by modelling a pickling line |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108832853A (en) * | 2018-06-20 | 2018-11-16 | 长春工业大学 | A kind of DC brushless motor speed regulating method based on fuzzy PI-PD control |
CN112051727A (en) * | 2020-08-14 | 2020-12-08 | 陕西千山航空电子有限责任公司 | Variable structure control algorithm |
CN113050418A (en) * | 2021-03-02 | 2021-06-29 | 山东罗滨逊物流有限公司 | Adaptive gain scheduling artificial intelligence control method |
CN113110127A (en) * | 2021-03-16 | 2021-07-13 | 西安交通大学 | Artificial auxiliary intelligent industrial controller |
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