CN113361713A - Rolling force control method for rolling mill production line based on self-adaptation - Google Patents
Rolling force control method for rolling mill production line based on self-adaptation Download PDFInfo
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Abstract
The invention relates to a rolling force control method for a rolling mill production line based on self-adaptation, and belongs to the technical field of metallurgy automation. The technical scheme of the invention is as follows: and (3) adopting a genetic algorithm to take the difference value between the set value of the strip steel thickness of the rolling mill production line and the field actual value of the strip steel thickness of the rolling mill production line as a system error, taking the rolling force F parameter of the rolling mill as a genetic algorithm chromosome for coding, updating an iterative updating rule according to the selected fitness function and the genetic chromosome, storing the rolling force of the rolling mill in the optimized rolling mill production line into an automatic oracle database of the rolling mill process, and transmitting the rolling force to the field of the rolling mill production line for adjusting the rolling force of the rolling mill. The invention has the beneficial effects that: the rolling force of the rolling mill production line is adaptively controlled in an online adjustment mode, and the quality and the performance of the finished steel coil of the cold-rolled sheet are optimized.
Description
Technical Field
The invention relates to a rolling force control method for a rolling mill production line based on self-adaptation, and belongs to the technical field of metallurgy automation.
Background
The cold-rolled steel coil is processed and rolled on the basis of a hot-rolled coil, generally, the cold-rolled coil is processed and rolled in the processes of hot rolling, pickling and cold rolling, and the cold-rolled strip has wide application range, such as automobile manufacturing, electrical products, rolling stocks, aviation, precision instruments, food cans and the like. The cold rolled thin steel plate is a short name of a common carbon structural steel cold rolled plate and is also called a cold rolled plate. The cold plate is a steel plate with the thickness less than 4mm which is made by hot rolling a steel strip of common carbon structural steel and further cold rolling. Because rolling at normal temperature does not produce scale, the cold plate has good surface quality and high dimensional precision, and the mechanical property and the processing property are superior to those of the hot rolled thin steel plate by adding annealing treatment, the cold plate is gradually used for replacing the hot rolled thin steel plate in a plurality of fields, in particular to the field of household appliance manufacturing. The cold rolling mill process system has important influence on the precision shape and the performance of a cold-rolled sheet product, and the calculation of the rolling force directly influences the quality and the performance of a steel coil. In the prior art, the rolling force calculation adopts a method of manually calculating tension, the manually calculated tension has larger error, and the time cost and the labor cost are higher.
Disclosure of Invention
The invention aims to provide a rolling force control method for a rolling mill production line based on self-adaptation, which adopts a genetic algorithm to take the difference value between the set value of the strip steel thickness of the rolling mill production line and the field actual value of the strip steel thickness of the rolling mill production line as a system error, takes a rolling force F parameter of the rolling mill as a genetic algorithm chromosome for coding, updates an iterative update rule according to a selected fitness function and the genetic chromosome, adopts an online adjustment mode to carry out self-adaptation control on the rolling force of the rolling mill production line, optimizes the quality and the performance of a finished steel coil of a cold-rolled plate, and effectively solves the problems in the background technology.
The technical scheme of the invention is as follows: a rolling force control method for a rolling mill production line based on self-adaptation comprises the following steps:
step a, taking rolling force F of a rolling mill production line as a chromosomeLine coding, randomly generating a matrix of N character strings, each character string being a chromosome, starting iteration of the character string matrix using the N character string matrix as an initial point of the genetic algorithm as
；
B, determining a fitness function J of the genetic algorithm, setting a system error ey (t), and receiving an on-site actual value y of the strip steel thickness of the rolling mill production line by an oracle database of a rolling mill process automation system in an on-line adjustment mode1The on-site actual value y of the thickness of the strip steel on the production line of the rolling mill1And the set value y of the thickness of the strip steel of the production line of the rolling mill2The difference value of (a) is taken as the system error ey (t), and the fitness function is calculated by the formula
U (t) in the formula is the controller output, tuSystem time, e (t) system error;
c, selecting a genetic algorithm, namely adopting an elite selection mode and a roulette mode, copying the individuals with the fitness value larger than the optimal fitness of the next generation to the next generation when the fitness of the individuals in the group of the next generation is smaller than the fitness of the individuals of the current generation, and randomly replacing the individuals in the next generation;
step d, crossing genetic algorithms according to a formula
Crossing the corresponding genes of the two strings to generate two new individuals with parent characteristics, in the formula TE (i) is the new individual, KE (i) is the parent individual,
a random number between 0 and 1;
e, genetic algorithm variation according to a formula
To one toPerforming variation calculation on the body, and obtaining the formula
Is a random number between 0 and 1, KfmaxAnd KfminIs KfMaximum and minimum values of;
and F, judging a system error ey (t), if ey (t) is greater than 0, returning to the step B for recalculation, if ey (t) =0, ending the calculation of the genetic algorithm, outputting an individual optimal parameter rolling force F generated by the genetic algorithm, storing the optimized rolling force F, namely the rolling force of the rolling mill in the rolling mill production line into an automatic oracle database, and transmitting the optimized rolling force F to a field rolling mill in the rolling mill production line, so that the self-adaptive control of the rolling force of the rolling mill is realized.
The invention has the beneficial effects that: the difference value between the set value of the strip steel thickness of the rolling mill production line and the field actual value of the strip steel thickness of the rolling mill production line is used as a system error by adopting a genetic algorithm, the rolling force F parameter of the rolling mill is used as a chromosome of the genetic algorithm for coding, the iterative updating rule is updated according to the selected fitness function and the genetic chromosome, the rolling force of the rolling mill production line is adaptively controlled by adopting an online adjustment mode, and the quality and the performance of the finished steel coil of the cold-rolled sheet are optimized.
Drawings
FIG. 1 is a diagram of the structure of the genetic algorithm of the present invention;
FIG. 2 is a schematic view of the rolling force control process of the rolling mill production line of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A rolling force control method for a rolling mill production line based on self-adaptation comprises the following steps:
step a, encoding rolling force F of a rolling mill production line as a chromosome, randomly generating a matrix of N character strings, taking each character string as a chromosome, starting iteration of the character string matrix by taking the N character string matrix as an initial point of a genetic algorithm as
；
B, determining a fitness function J of the genetic algorithm, setting a system error ey (t), and receiving an on-site actual value y of the strip steel thickness of the rolling mill production line by an oracle database of a rolling mill process automation system in an on-line adjustment mode1The on-site actual value y of the thickness of the strip steel on the production line of the rolling mill1And the set value y of the thickness of the strip steel of the production line of the rolling mill2The difference value of (a) is taken as the system error ey (t), and the fitness function is calculated by the formula
U (t) in the formula is the controller output, tuSystem time, e (t) system error;
c, selecting a genetic algorithm, namely adopting an elite selection mode and a roulette mode, copying the individuals with the fitness value larger than the optimal fitness of the next generation to the next generation when the fitness of the individuals in the group of the next generation is smaller than the fitness of the individuals of the current generation, and randomly replacing the individuals in the next generation;
step d, crossing genetic algorithms according to a formula
Crossing the corresponding genes of the two strings to generate two new individuals with parent characteristics, in the formula TE (i) is the new individual, KE (i) is the parent individual,
a random number between 0 and 1;
e, genetic algorithm variation according to a formula
Performing variation calculation on the individuals in the formula
Is a random number between 0 and 1, KfmaxAnd KfminIs KfMaximum and minimum values of;
and F, judging a system error ey (t), if ey (t) is greater than 0, returning to the step B for recalculation, if ey (t) =0, ending the calculation of the genetic algorithm, outputting an individual optimal parameter rolling force F generated by the genetic algorithm, storing the optimized rolling force F, namely the rolling force of the rolling mill in the rolling mill production line into an automatic oracle database, and transmitting the optimized rolling force F to a field rolling mill in the rolling mill production line, so that the self-adaptive control of the rolling force of the rolling mill is realized.
The invention is characterized in that:
1. the genetic algorithm is applied to the rolling force control calculation of the rolling mill production line, and the self-adaptive control of the rolling force of the rolling mill production line is realized.
2. The difference value between the set value of the strip steel thickness of the rolling mill production line and the field actual value of the strip steel thickness of the rolling mill production line is used as a system error in an online adjustment mode, so that the rolling force of the rolling mill production line is controlled in real time.
3. The transportability is strong, and other cold rolling production lines can be generally transplanted.
Claims (1)
1. A rolling force control method of a rolling mill production line based on self-adaptation is characterized by comprising the following steps:
step a, encoding rolling force F of a rolling mill production line as a chromosome, randomly generating a matrix of N character strings, taking each character string as a chromosome, starting iteration of the character string matrix by taking the N character string matrix as an initial point of a genetic algorithm as
；
B, determining a fitness function J of the genetic algorithm, and setting system errorsThe difference (t) adopts an online adjustment mode, and an oracle database of a rolling mill process automation system receives the field actual value y of the strip steel thickness of a rolling mill production line1The on-site actual value y of the thickness of the strip steel on the production line of the rolling mill1And the set value y of the thickness of the strip steel of the production line of the rolling mill2The difference value of (a) is taken as the system error ey (t), and the fitness function is calculated by the formula
U (t) in the formula is the controller output, tuSystem time, e (t) system error;
c, selecting a genetic algorithm, namely adopting an elite selection mode and a roulette mode, copying the individuals with the fitness value larger than the optimal fitness of the next generation to the next generation when the fitness of the individuals in the group of the next generation is smaller than the fitness of the individuals of the current generation, and randomly replacing the individuals in the next generation;
step d, crossing genetic algorithms according to a formula
Crossing the corresponding genes of the two strings to generate two new individuals with parent characteristics, in the formula TE (i) is the new individual, KE (i) is the parent individual,
a random number between 0 and 1;
e, genetic algorithm variation according to a formula
Performing variation calculation on the individuals in the formula
Is a random number between 0 and 1, KfmaxAnd KfminIs KfMaximum and minimum values of;
and F, judging a system error ey (t), if ey (t) is greater than 0, returning to the step B for recalculation, if ey (t) =0, ending the calculation of the genetic algorithm, outputting an individual optimal parameter rolling force F generated by the genetic algorithm, storing the optimized rolling force F, namely the rolling force of the rolling mill in the rolling mill production line into an automatic oracle database, and transmitting the optimized rolling force F to a field rolling mill in the rolling mill production line, so that the self-adaptive control of the rolling force of the rolling mill is realized.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326402A (en) * | 2021-12-29 | 2022-04-12 | 北京石油化工学院 | Pneumatic proportional position system control method of MFAC (Multi-frequency alternating Current) based on genetic algorithm optimization |
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| CN110704956A (en) * | 2019-08-09 | 2020-01-17 | 太原科技大学 | Cold rolling mill data-driven technological parameter optimization method |
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| CN107321799A (en) * | 2017-07-06 | 2017-11-07 | 重集团大连工程技术有限公司 | A kind of parameter of new mill control technique formulates integrated system |
| CN110704956A (en) * | 2019-08-09 | 2020-01-17 | 太原科技大学 | Cold rolling mill data-driven technological parameter optimization method |
| CN111702018A (en) * | 2020-06-29 | 2020-09-25 | 新余钢铁股份有限公司 | Method for improving thickness precision of rolling target of medium plate |
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