SU1399699A1 - Management system for production bays - Google Patents

Abstract

The invention relates to automatic control systems and can be used to control production sites. The purpose of the invention is to improve the accuracy of the system. The system contains the control unit, actuating units, sections, conveyors, adders, intermediate capacitance, sensors, delay blocks, reverse model of the second section, filters, comparison blocks, extrapolation. drivers, adjuster, control blocks, keys, subtraction unit, inverse models of the first section, integrator, extrapolator block, delay block, comparison block. The system allows to ensure the invariance of the controlled coordinate from uncontrolled external influences. When managing production sites, c. which there are transport delays between which there is an intermediate capacity and possible movement of material flows from one section to another. S 1 hp f-ly, 1 ill. (L

Description

The invention relates to automatic control systems and can be used to control areas: production, characterized by the presence of an intermediate tank between sections, the presence of transport delays in sections, the possibility of movement of material flows directly from the first section to the second, or through an intermediate capacity , the presence of uncontrolled disturbing influences.

An example of such facilities are metallurgical production shops with storage facilities (containers) for semi-finished products, in particular, steel bars from steel-smelting workshops can be sent directly to rolling shops or through a warehouse of cold ingots.

The goal of the invention is to improve the accuracy of the system.

The drawing shows a block diagram of the proposed production site management system.

In the drawing, W, (t) and W2 (t) are uncontrolled disturbances acting on the first and second sections at the moment of time t Q (t) - the input (material or energy) effect on the control system (object) Y (t) is the output of the control object,

The control system of production areas contains the control object 1, which includes the first execution unit 2, the first section 3, the first r conveyor 4, the second executor block 5, the adder 6, the second section 7, the second conveyor 8, intermediate tank 9, the third execution unit 10, fifth 11, fourth 12, third 13, second 14 and first 15 sensor ki, quarter adder 16, second delay block 17, first adder 18, reverse model 19 of the second section, second filter 20 (low frequency), first block 21 Comparison, the second expander torus 22 master 23, comp Rathore 24, the third comparing unit 25, first control unit 26, the second switch 27, a second control unit 28, the first switch 295 subtracting unit 30, the first delay unit 31, the second block

32 comparisons 5. the third 6j50K 33 delays, the fifth adder 34, the first reverse model 35 of the first section, the integrator 36, I rotate the reverse model

d

-15 20

zo

, / .y,,,

50

55

37 first plot, third filter

38 (low frequency), extrapolator block 39, including 39-1, ..., 39-j, ..., 39-N extrapolator, first AO filter (low frequency), first extrapolator 41, block 42 delay elements, inclusive of N delay elements, a comparison element block 43, including N comparison elements, a second adder 44, a third control unit 45, a third adder 46.

The control object 1 is represented, for example, by agglomeration production areas of metallurgical production of pre-. with t. Q (t) is the flow of charge materials, the first 2 and third 10 execution units are continuous weighing batchers, the second execution unit 5 is a shuttle shuttle, a porter with a throw-over gate, conveyors 4 and B for bulk materials, the first 3 and second 7 sections can be represented as a first-order inertial link, intermediate tank 9 - an integral link, the first 15, the second 14, the third 13, the fourth 12 and the fifth 11 sensors are Tape Mass Measuring Instruments. The inverse models of 19.35 and 37 plots can be represented in the form of proportional differentiating links; the first regulating block 26 with the P-law of regulation, the second regulating block 28 with the pi-law of regulation.

The production site management system operates in the following way.

The variable of the control object 1 is measured by the first sensor 15, and the received signal Y (t) is subtracted in the first comparison unit 21 from the signal Y (t) about the set value of the output variable received from the sensor 23. In the second filter 20, the low frequency The high-frequency components of the signal Sy (t) Y (t) -Y (t) and the received signal Sy (t) is converted in the inverse model 19 of the second section into a delayed correction signal "Ui of the control action of the second section. To determine the implemented control action U of the second plot, the output value of the second execution unit 5 is measured by the third sensor 13, and the output value of the third execution unit 10 by the second sensor 14, the output signals of these sensors are summarized in four

Volume 16. The signal U (t) on the control action found at the current time is delayed in the second delay block 17 by the delay time G in the second conveyor 8 and summed algebraically in the first accumulator 18 with the output signal of the inverse model 19 of the second segment. At the output of the first adder 18, a signal is received) about the exemplary control action of the second section restored with delay by the time Tj

as a result, equality is established and, (c) Q2 (t) and the required amount of material enters the second section.

If U (t) Q (t), i.e. the amount of material entering the second execution unit 5 is not enough to fulfill the equality QjCt)), then the comparator 24 generates a signal at which the key 29 is opened and the second control unit 28 supplies the input to the second. Executive unit 5 team,

.. s-II rrr; G ,, f 15 for which the equality U, (t-oJ-U (t) (t) J, (1) Q (t) Qjt) holds, i.e. All the material JCC is the operator of the inverse model 19 of the second segment. The signal UjCt-fTg) is extrapolated to the time T in the second extrapolator 22, and as a result 20 at its output a signal is received about the required control action of the second portion.

The signal v (t) on the required control action of the second section 25 by the executive unit 10. As a result, it goes to the comparator 24, where, compared to the third tank 9, it is threaded with the signal of the fourth date-to-executive unit 10 on the value of the material flow. - the second section 7 through the adder 6 ka Q (t) before the executive unit is the missing amount of material.

30 To generate a control action and, (c) the first section 3 starts with the second execution unit 5 to the second section. At this time, the second key 27 is closed and the signal about the lack of material from the output of the third comparison unit 25 is fed to the input of the first regulating unit 26, which produces a signal controlling the third

5. If U (t); Q (t), then it is possible to send the material not to the intermediate tank 9, but directly to the second section 7 via the adder 6 |, and then the comparator turns the zero signal on the output for gg d, section 3 disregarding the amount by which the first key (disconnecting) 29 of the material required to maintain is in the closed state, and

the la is restored with a delay of G, in the first conveyor 4 the exemplary control action U, (t-r,) the first key 27 (for; slamming) - in the open state. When the second key 27 is open, the first regulating unit 26 with proportional control adjusts the zero signal, at which the third execution unit 10 (metering unit) is stopped and does not deliver the material from the intermediate tank 9 to the second section 6. In the third comparison unit 25 from the Sigal U ( t) subtracts the signal ((t) from the output of the third sensor 13 on the value of the material flow coming from the second execution unit 5 to the second section. With the first key 29 closed, the signal) -U (t) -Q (2) output from the third section 25 comparison is fed to Torah regulator unit 28 but .s proportional-integral control law, which signal is generated by the second execution unit 5 in

reserves in intermediate tank 9. For this purpose, the output signal Q (t) of the fourth Sensor 12 is delayed in.:.

0 of the first block 31 of the delay per second and is subtracted in the second comparison block 32 from the output signal U2 (t) of the fourth adder 16. The received difference signal QiCt) converts 45 SI in the first inverse model 35 of the first section into the delayed correction signal SU, controlled by the effect of the first section 3. and is summed algebraically in the fifth sum 34 torus with the delay in the third delay block 33 by the delay time 2 in the first conveyor 4. output signal of the fifth sensor 11. At the output of the fifth adder 34,

55 signal about recovered with delay for cG time, perturbative control action of the first section

U (t (-f,) U, (t-T:,) - fCf-; (l), (2)

where Q (t) Qjt holds, i.e. all the material is supplied by the executive unit 10. As a result, from the intermediate tank 9, the third executive unit 10 is fed to the second section 7 through the adder 6 the missing amount of material.

The second executive unit 5 to the second section. At this time, the second key 27 is closed and the signal) about the missing amount of material from the output of the third comparison unit 25 is fed to the input of the first regulating unit 26, which produces a signal controlling the third

d, section 3 without taking into account the amount of material required to maintain

in the first conveyor 4, the exemplary control action U, (t-r,) per, section 3 without taking into account the amount of material required to maintain

reserves in intermediate tank 9. For this purpose, the output signal Q (t) of the fourth Sensor 12 is delayed in.:.

the first block 31 of the delay at times c and is subtracted in the second block 32 of the comparison from the output signal U2 (t) of the fourth adder 16. The signal about the obtained difference QiCt converts the SR in the first inverse model 35 of the first section into the signal about the delayed correction SU, controlling the effect of the first section 3. and is algebraically summed in the fifth adder 34 with the delay in the third block 33 delayed by the delay time 2 in the first conveyor 4. the output signal of the fifth sensor 11. The output of the fifth adder 34 is obtained

signal about recovered with delay for cG time, fractional control action of the first section

U (t (-f,) U, (t-T:,) - fCf-; (l), (2)

513996996

Rde Ui (t-C.j) - control of the effects of delay elements A2-1, ... , 42-j,. , , 8th of the first section; . - operator 42-N, n signals about the obtained differences of the inverse model of the first segment. Sig-algebraically summed in the second

a small U (t-bi) is extrapolated in the per-adder 44. The output signal of the third extrapolator 41 to the current adder 46 on the value of the control action of the first section 3 goes to the third control unit 45, which produces a signal that controls first execution unit.

The time point t is fed to the input of the Third adder 46, where it is algebraically summed with the corrections of the controlling influence of the first section 3 intended to hold the material in the intermediate tank 9. These corrections are calculated, firstly, by between the arrival and consumption of the material in the intermediate tank 9 and, secondly, by the amount of material in the first conveyor 4, it is intended to fill it with an intermediate loan of 1st package 9.,

To calculate the first part of the corrections in the subtraction unit 30, the signal of the third sensor 13 is subtracted from the sum of the signals of the fourth 12 and second 14, and thus the signal uQ I is determined, about the difference the arrival of 1 material consumption in the intermediate tank 9. This signal is integrated in the integrator 36 and the reverse model 37 of the first section is supplied to the second, where it converts the signal of the part of the correction of the control action of the first section 3. In order to determine the other part of the correction, there are differences between the points of the actual trajectories and someone re quired amount of material on the Institute; interval time 47: which are then algebraically summed. For this, the signal of the fifth sensor 11 is averaged over the time interval jT,

 - in the first filter 40 low-N

and delayed in block 42 of the element of the first model, the integrator, the delay elements for the time tTB (42- and the first output of the object is connected by the 1) delay element, is sent to the second input of the first block (42-j) -oM delay element, compare, the output of the second filter is NutT t, in the (42-N) -oM delay element. reverse model of the second section The output signal of the fifth adder 34 gQ is also averaged over the time interval and in the third low-pass filter 38 and extrapolated for time intervals from 6 to Z, by extrapolators 39-1, ..., 39-, ..., 39-N to the comparators Ator, the output of which juice is 39 extrapolators. In block 43 it is connected with control inputs of comparison elements from the output signal and second keys, the outputs of which catch extrapolators 39-N, ..., 39-j, are connected to the inputs, respectively .... 39-1, the output is subtracted the signal of the second and third regulatory blocking is connected to the first input of the first adder connected by the output to the input of the second extrapolator connected by the output to the first input of the third comparison unit and to the first

adder 44. The output signal of the third

The adder 46 on the value of the control action of the first section 3 goes to the third control unit 45, which generates a signal controlling the first execution unit.

Claims (2)

1. A production control system containing the control object, the first, second and third comparison units, the first, second and third filters, the first and second extrapolators, the first, second, third and fourth adders, the block of delay elements, the first and second control blocks, first delay block, extrapolator block, comparison block, setpoint generator, the output of which is connected to the first input of the first comparison block connected by an output to the second filter input, the output of the first delay block is connected to the first second input unit of comparison, the group of outputs of the block of delay elements is connected respectively to the first group of inputs of the block of elements. the comparison, the group of outputs of which is connected to the group of inputs of the second adder, the second input of the third sum The mator is connected to the output of the first extrapolator, which is distinguished by the fact that, in order to improve the accuracy of the system, a fifth adder, second and third delay blocks, a reverse model of the second segment, a comparator, a third regulator block, first and second keys, subtraction unit, first and second keys the models of the first section, the integrator, the first output of the object being connected to the second input of the first comparison unit, the output of the second filter through the reverse model of the second section to the comparator input, the output of which is connected to the control inputs of the first and second keys, the outputs of which are connected to the inputs of the second and third regulating blocks, respectively, with the first input of the first adder connected by the output to the input of the second extrapolator connected by the output to the first input of the third comparison unit and to the first 71 the coils connected by the outputs to the first and second inputs of the control object, the second output of which is connected to the first input of the fourth adder, the output of which is connected through the second delay unit, to the second input of the first adder, and directly to the second input of the second comparator unit - | Nogo output through the first reverse model of the first section to the first input of the fifth adder, the second input of which is connected to the output of the third delay unit, the input of which is connected to the fifth output of the control object and with Odom first filter output connected to the inputs of unit delay elements, the output of the fifth adder connected to a first input of the extrapolation of the torus and to the input of the third filter, the output of which is connected to the extrapolation block tori inputs ,. the group of outputs of which is connected respectively to the second group of inputs of the unit of comparison elements, the output of the second adder is connected to the first input of the third adder connected by the output through the third one - the regulation block to the third input of the control object, the second output of which is connected to the first input of the unit connected to the output through the serially connected integrator and the second inverse model of the first section to the third input of the third adder, the third output of the control object is connected to the second input the fourth first adder and a second input of the third comparing unit, the output sub Turning to the inputs of the first and second keys and to the second input of the subtracting unit, a third input coupled to a fourth output of the control object, with the second input of the comparator and to the input of the first blo996998 delays, the fourth input of the control object is the input of the input action of the system. . 2. The system of claim 1, wherein the control object includes first, second, and third execution units, first and second portions, first and second transducers, intermediate tank, first, second, third , the fourth and fifth sensors and the adder, and the fourth input of the control object is connected to the input of the first executive 15 of the unit connected to the control by the input to the third input of the control object, the fifth output of which is connected to the output of the fifth sensor, whose input is connected to the input of the first optional module and through the first section and the first conveyor connected in series to the input of the second execution unit and to the input of the fourth sensor, connected to the output of the fourth to the fourth output of the control object, the third output of which is connected to the output of the third sensor connected to the input to the first output of the second execution unit and to 30 to the first input of the adder, the output of which through the second section connected in series, the second conveyor and the first sensor are connected to the nep-i output of the control object, the second code of which is connected to the output of the second sensor, the input of which is connected to the second accumulator and the output The third execution unit, whose control input is connected to the second input of the control object, the first input of which is connected to the control input of the second execution unit, the second input of which through an intermediate capacitor of the connections to the input of the third executive 35 40 45 telny block.