CS244299B1 - Apparatus for testing adaptive controllers, strip thicknesses for quadruples - Google Patents

Abstract

the solution relates to an apparatus for testing adaptive belt thickness controllers for rolling a mill with a quarto-type mill. The essence of this is the connection of the strip thickness generator and the position pulse block, which together with the two shift registers, the forming gap block, the building dynamics block and the cylinder eccentricity block, operate an adaptive strip thickness controller in a closed loop in conditions corresponding to the real Kvarto rolling mill. Test device signal parameters ■ can be set according to the design of the design track. The evaluation device processes the control results and transmits them in a visual form to the display panel. The solution can be used, for example, for testing the properties of adaptive controllers when changing the parameters of a controlled system or for verifying new control algorithms, or for diagnosing controllers under operating conditions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

The systems known to date for adaptive strip thickness controllers are based primarily on the gradual verification of the function of the individual function blocks of the controllers by means of suitable measuring instruments. The disadvantage of this procedure is that the desired function of the separate function blocks is achieved. verified · Testing of the function of the adaptive strip thickness regulator as a whole is then conditioned by simulating all the necessary signals replacing the individual sensors on the rolling mill from separate generators, which is very difficult especially in operating conditions · It is necessary to ensure that the parameters of all these signals correspond dimensional arrangement of the actual rolling mill for which the tested adaptive controller is designed, which represents another disadvantage of this method · 1 after overcoming Above mentioned difficulties, however, there will be an abortion to verify the correct function of the controller in individual isolated steps of the control algorithm calculation · Testing of the controller operation in continuous simulated closed loop operation is practically impossible, but this is a significant disadvantage especially for adaptive controllers. when changing control algorithms before connecting it to a real rolling mill ·

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The present invention relates to an apparatus for testing adaptive, band-thickness controllers for quaternary stations comprising a strip thickness inlet block, a first shift register, a forming gap block, a block dynamics building block *, a second shift register, an evaluation device, a display panel and a position pulse block. connected so that the output of the input strip thickness block is connected both to the value input of the first shift register and to the second value input of the evaluation device and to the first value input of the adaptive controller under test. output of the first shift register is connected to the first value input of the forming gap block whose second value input is connected to the output of the building dynamics block · The third value input of the forming gap block is connected to the output of the exce block cylinder output and forming gap block output is connected to the value input of the second shift register whose logic input is connected to the second output of the position pulse block · The output of the second shift register is connected to the second value input of the adaptive controller under test and device * whose output is connected to the value input of the display panel. The display panel information input is connected to the information output of the test adaptive controller, and the building dynamics block input is connected to the control output of the test adaptive controller, wherein the first position pulse block output is connected simultaneously to the first logic input of the test controller. The second output of the position pulse block is connected simultaneously to the cylinder eccentricity block input and to the second logic input of the adaptive controller under test.

The device according to the invention removes the above-mentioned disadvantages compared to the previous devices. The main advantage is the fact that the device allows long-term testing of the adaptive strip thickness regulator features for quartost rolling mill in conditions similar to the actual track operation.

This makes it possible to assess the properties of the controller when simulating

- 3,244,299 changes the parameters of the controlled system, particularly with regard to the stability of the control algorithms * Another advantage is that _of the device 'allow © prepared analogously to & ovata any new control algorithms of adaptive · controller before connecting the controller to a real rolling mill, without the risk of any damage Technology The device also generates all the necessary signals - in mutual proportions corresponding to a particular rolling mill, which facilitates the test procedure. The amount of disturbances, eg the roll eccentricity amplitude or the building dynamics can be adjusted in a wide range - range and determine its influence on the quality of the output belt · The device performs evaluation of the controller behavior on the basis of measured data and displays the results achieved in a form suitable for the system user, which A greater advantage especially in the diagnosis of adaptive belt thickness controllers directly in operating conditions and thus considerably shorten the rolling mill shutdown time due to repair of possible failure of the belt thickness control system. The device for testing adaptive belt thickness controllers for quarto stations can be realized from discrete electronic components. However, when using a microcomputer system in an evaluation device, it is possible to process a lot of data. and thus obtain more accurate information about the state of the tested controller ·

The device for testing adaptive belt thickness controllers for quarto stations is apparent from the attached illustration.

The device according to the invention consists of a strip 2 of the input strip thickness, which generates a selected curve of the input strip thickness located at the location of the input meter, the output of which is connected to the value input; b of the first shift register 2, on the one hand to the second value input δ of the evaluation device 8 and to the first value input in the adaptive controller 11 to be tested. Further, the device consists of a first shift register 2 which shifts the input strip thickness deviation from the thickness gauge whose logical

4 244 299 input c is connected to the first output Jb of the block 10 of the position pulses and output d of the first shift register 6 is connected to the first input of the forming gap block 4, which simplifies the deformation process in the mill rolling gap. the input f of the forming gap block 6 is connected to the output 1 of the building dynamics. The third value input 6 of the forming gap block 6 is connected to the output to the cylinder eccentricity block 2 and the output h of the forming gap block 11 is connected to the value input 1 of the second shift register which shifts the thickness value of the newly formed strip element from the roll gap to the thickness gauge.

The logic input b of the second shift register 8 is connected to the second output of the position pulse block 10 and the output n of the second shift register 2 is connected to the second value input w of the adaptive controller 11 being tested and processing of measured data · The output 8 of the evaluation device 8 is connected to a value input; The display panel 5 is shown in FIG. 2, which shows test results and control parameters, the information input and display panel 6 being connected to the information output a1 of the adaptive controller 11 being tested. The device consists of a block of 20 position pulses, which generates two two-phase pulse waveforms imitating signals from incremental belt length sensors upstream and downstream, whose first output t is connected simultaneously to the first logic input. x Test Adaptive Controller 11 »The second output of block 10 of position pulses is connected both to the second logic input χ of the tested adaptive regulator 11 and to the input of the cylinder eccentricity block 6, which simulates the influence of the support roll eccentricity to the strip thickness in the rolling mill gap ·

The apparatus 1 for testing the adaptive bandwidth regulators' for the quarto stations according to the invention operates such that block 2

5 244 299 an inlet strip thickness generates a selected inlet strip thickness profile located at the inlet thickness gauge. The thickness values corresponding to the individual sections of the strip are moved by the first displacement register χ to the forming gap of the mill stand as a function of the pulses from the position sensor in front of the stand which generates a block of 10 position pulses. The forming gap block 4 simulates in a simplified manner the material forming process in the rolling gap of the stool. There is an interaction between the deviation of the inlet strip thickness from the nominal value and the effect of the control to compensate for this failure component. The control signal emitted by the test controller is processed in the building dynamics block so that the control effect in the forming gap corresponds as closely as possible to the real stool. The Blend Dynamics% block not only respects the cylinder dynamics servo mechanism itself, but also partially includes the influence of the inlet tension control on the strip output thickness. In the forming gap block 4, the main failure due to the quarto-eccentricity of the backing rollers also acts. The instantaneous value of the effect of the eccentricity of the rollers as a function of their angular rotation is formed by the block, 6 of the eccentricity of the rollers, the angular rotation of the support rolls being derived from the position sensor signal at the output side of the stool. This output position signal, which generates a block 10 of position pulses, also determines the rate of travel of the individual belt elements in the second shift register. The second shift register J shifts the thickness values of the just formed strip element from the forming gap to the output thickness gauge. The values corresponding to the signals from the input and output thickness meters are further processed in the evaluation device S according to the specified test criterion. For lower requirements for the scope of information about the testing in progress, eg mean values and standard deviations of input and output strip thickness are determined. · Determine histograms or correlation of input and output thickness

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- 6 belt. The values of the selected test criteria along with other control parameters are brought to the display panel 2 for operator information. The tested adaptive controller 11 is connected to the device 1 by its inputs to the input and output thickness and strip length signals. The control output of the adaptive controller 11 to be tested is connected to the building dynamics block 2 and the information output; to display panel 9 ·

The above-described quartostolic © adaptive belt thickness controllers can be used for testing and diagnostic purposes on all adaptive belt thickness controllers using the above-described variables, regardless of controller design. It is applicable to both adaptive controllers made from discrete electronic components and for microcomputer-based controllers ·

Claims (1)

A device for testing adaptive belt thickness controllers for quarto stations comprising an input belt thickness block, a first shift register, a forming gap block, a building dynamics block, a cylinder eccentricity block, a second shift register, an evaluation device, a display panel and a positioning pulse block. the output (a) of the block (2) of the input strip thickness is connected both to the value input (Έ >>) of the first shift register (3) _r and to the second value input (p) of the evaluation device (8) and to the first value input ) of the adaptive controller (11) being tested, wherein the logic input (c) of the first shift register (C3) is connected to the first output (position) of the pulse block (10) and that the output (d) of the first shift register (3) is connected to the first input (e) of block C4) forming gap whose second value input Cf) is connected to output C1) of block ¢ 5) building dynamics, the third value The input gap (g) of the forming gap block (4) is connected to the output (k) of the cylinder eccentricity block (6), and the output (h) of the forming gap block (4) is connected to the value input (i) of the second shift register (7). ), whose logic input (m) is connected to the second output (u) of the position pulse block (10), and that output Cn)) of the second shift register (7) is connected to the second value input Cw) of the adaptive controller under test and a first value input (o) of the evaluation device (8) "whose output Cq) is connected to the value input (r) of the display panel (9), whose information input (a) is connected to the information output Cal" of the adaptive controller (11) tested; that the input (c) of the building dynamics block (5) is connected to the control output Ca) of the test adaptive controller (11), the first output (t) of the position pulse block (10) being connected to the first logic input (x) of the test controller (11) ) and that dr uhý output; (u) the position pulse block (10) is connected simultaneously to the cylinder eccentricity block (6) input (j) and to the second logic input Cy) of the adaptive?