JPH0757372B2 - Acceleration / deceleration compensation control method by computer of looper tower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process control method for adjusting the accumulated amount of steel sheet in a looper tower, and particularly in the case of performing process acceleration / deceleration compensation in a looper tower process line. Using process state as input variable 4
The present invention relates to a control method for deriving the compensation amount in the processing of steps.

[Conventional technology]

Conventionally, in the looper tower, the acceleration / deceleration compensation of the process when passing the steel sheet from the entry side section to the exit side section has been done by compensating the amount of steel sheet in the looper tower, the roll winding angle depending on the height of the looper tower, and the entry side and exit side of the looper tower. It is known that the amount of compensation changes due to acceleration / deceleration in both sections on the side. In addition, in this type of process control method, the nonlinearity of the process characteristics is strong, so the characteristics change depending on the process state. . As described above, in the conventional process control method, since the compensation amount and the characteristic change, a complicated algorithm is required if the derivation of the proper acceleration / deceleration compensation amount of the process is realized by the four arithmetic operations as in the conventional method. Therefore, the system becomes complicated.

[Problems to be Solved by the Invention]

Therefore, in the conventional system, since a complicated algorithm is required for deriving the appropriate amount of acceleration / deceleration compensation for the process as described above, such acceleration / deceleration compensation is not usually performed.

Therefore, an object of the present invention is to simplify a complicated algorithm for performing the four arithmetic operations required in response to the acceleration / deceleration compensation of the process and the change of the process characteristic, and to facilitate the aggregation of different control algorithms. By,
An object of the present invention is to provide a computer-based acceleration / deceleration compensation control method capable of easily achieving acceleration / deceleration compensation for a process.

[Means for Solving the Problems]

A computer-aided acceleration / deceleration compensation control method for a looper tower according to the present invention includes a looper between an entrance side section and an exit side section of a steel plate, and the looper tower is controlled so as to adjust the accumulated amount when the steel plate is threaded. In the process line that is provided with, the first step of classifying the input variables corresponding to the process state of the looper tower and the classified input state of each process state are combined to quantify the suitability of the process state. A second step of performing, a third step of multiplying the quantified goodness of fit by the acceleration / deceleration compensation amount of each process state, and a centroid of the compensation amount from the product of the acceleration / deceleration compensation amount and the goodness of fit. The calculation process including the fourth step of calculation is performed, and the obtained center of gravity of the acceleration / deceleration compensation amount is used as the current acceleration / deceleration compensation amount of the looper tower. Supplying a tower of the drive unit,
It is characterized in that the process line is controlled.

[Action]

According to the computer-aided acceleration / deceleration compensation control method for the looper tower according to the present invention, the input state relating to the process state of the looper tower, that is, the cross-sectional area of the steel sheet, the height of the looper, and the set speed of both sections is divided into the input states. , And then combine these divided input states to derive an arbitrary state conformance of the looper tower, and multiply the acceleration / deceleration compensation amount in that state by the derived conformance in each state,
By obtaining the center of gravity value from the obtained multiplication value of the acceleration / deceleration compensation amount, the appropriate acceleration / deceleration compensation amount of the current looper tower can be easily and easily derived, and the acceleration / deceleration compensation control by the looper tower computer can be performed smoothly. Can be achieved.

〔Example〕

An embodiment of a computer-aided acceleration / deceleration compensation control method for a looper tower according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a control system diagram of a looper tower for implementing the acceleration / deceleration compensation control method of the present invention. That is, in FIG. 1, reference numeral 10 is a looper tower, and 12 is this looper tower.
Reference numeral 10 denotes a steel plate supplied from the entry side section to the exit side section of 10, a drive motor 14, a thyristor control device 16 and a drive device 18. However, in the present invention,
With respect to the drive device 18 of the looper tower 10 configured as described above, the acceleration / deceleration compensation amount is calculated and calculated by the following computer.

First, in order to understand the process status of the looper tower 10,
Input these to the function generator 20 by using the cross-sectional area (A) of the steel plate 12, the height (H) of the looper, and the speed setting values (V ₁ , V ₂ ) of both the input and output sections as input variables. Then, the state of each input is classified. The speed setting value (V ₁ ,
V ₂ ) via the differentiator 22
Fill in 20. The above processing operation is the first step I.
Is. As a specific processing operation in the first step I, for example, when the sectional area (A) of the steel plate 12 is divided, as shown in FIG. 2, large (A1), medium (A2), There are three categories, A1 to A3, such as small (A3). Similarly, the height of the looper (H) in the H1-H3, the speed setpoint (V ₁₎ to V ₁₁ ~V _14, and the speed setpoint (V ₂₎
Can be divided into V _{21 to} V ₂₄ , respectively.

Next, in the first step I, the outputs of the 14 function generators (A1 ...
The state of the looper tower 10 is divided into 144 patterns of step II, and the lowest fitness of each output of the function generator 20 of each pattern is derived [MIN operation]. This is defined as the goodness of fit of the corresponding pattern hi (i = 1 to 144). This processing operation is the second step II.

That is, in the second step II, for example, when the cross-sectional area of the steel plate 12 is large (A1), the height of the looper is high (H1), and the entrance side section is accelerated (V ₁₁ ), h ₁ The degree of conformity of each process state of ~ h _{144 to} the input state is quantified and the degree of conformity is derived. In this embodiment, the input state is divided into 14 patterns, and the looper tower 10 is divided into 144 patterns (3 × 3 × 4 × 4). In this way, the fitness h ₁ ( ₁ = 1 to 14) of each state of the looper tower 10
4) is required.

Next, the acceleration / deceleration compensation amount ui (i = 1 to 144) corresponding to each state hi (i = 1 to 144) of the looper tower 10 is determined and set,
The fitness h ₁ of each state of the looper tower 10 is multiplied by the acceleration / deceleration compensation amount u ₁ ( ₁ = _{1 to} 144) in each state by the multiplier 24 to calculate the compensation amount g ₁ . This processing operation is the third step III.

Then, from the goodness of fit h ₁ and the compensation amount g _{1 in} each state obtained in the second step II and the third step III, the center of gravity calculator 26 adds the center of gravity, that is, the current state of the looper tower 10. The deceleration compensation amount u ₀ is derived. This processing operation is the fourth step IV. In this case, the center-of-gravity calculator 26 calculates the following equation.

The acceleration / deceleration compensation amount u ₀ obtained in this way is input to the drive unit 18 of the looper tower 10 and the looper tower 10
It is possible to properly adjust the accumulated amount of the steel plate in.

〔The invention's effect〕

As is apparent from the above-described embodiment, according to the control method of the present invention, when attempting to perform acceleration / deceleration compensation in the conventional looper tower, the algorithm in the computer for obtaining an appropriate acceleration / deceleration compensation amount becomes complicated, and However, it is difficult to perform acceleration / deceleration compensation, but by performing the arithmetic processing consisting of the four steps described above, it is possible to derive the compensation amount with a simple algorithm combination, and to perform acceleration / deceleration compensation control in the looper tower. It can be easily realized. When performing the arithmetic processing consisting of the above-mentioned four steps, the function generator 20 is used based on the fuzzy theory.
Apply the membership function to and execute the MIN and centroid algorithms.

Therefore, according to the control method of the present invention, in order to grasp the state of the looper tower, even if the division of the state increases or decreases, the control program for the acceleration / deceleration compensation control by the computer is configured by the configuration of the algorithm consisting of the four steps described above. Construction can be easily achieved.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a control system diagram of a looper tower showing an embodiment of an acceleration / deceleration compensation control method by a computer of a looper tower according to the present invention, and FIG. 2 is a processing content of a function generator in the first step shown in FIG. It is a systematic diagram which shows a specific example. 10 …… looper tower, 12 …… steel plate 14 …… driving motor 16 …… thyristor controller 18 …… driving device, 20 …… function generator 22 …… differentiator, 24 …… multiplier 26 …… centroid calculator

Claims (1)

[Claims] 1. A process line comprising a looper between an entrance side section and an exit side section of a steel plate, and a looper tower for controlling the accumulated amount when the steel plate is threaded. A first step of classifying the input variables according to the process state; a second step of combining the classified input states of the respective process states to quantify the suitability of the process state; The third step of multiplying the acceleration / deceleration compensation amount of each process state by the conformity degree, and the fourth step of calculating the centroid of the compensation amount from the multiplication value of the acceleration / deceleration compensation amount and the conformance degree. The center of gravity of the obtained acceleration / deceleration compensation amount is supplied to the drive device of the looper tower as the current acceleration / deceleration compensation amount of the looper tower by performing arithmetic processing.
An acceleration / deceleration compensation control method by a computer for a looper tower, characterized in that the process line is controlled.