SU1552164A1 - Device for solving problems of heat transfer - Google Patents

Abstract

The purpose of the invention is to improve the accuracy of the device. The device contains a block for modeling a temperature regulator, a block for setting boundary conditions, a block for specifying initial conditions, a block for recording, a block for synchronization, a block for modeling a temperature meter. Additionally, a simulation block of the main heater and an afterburner simulation block are introduced, each of which contains two multivibrators, a square pulse generator, an AND element, a binary counter, two HE elements, two AND-NOT elements and a reversible counter, two reference value registers, a subtractor and a decision result generating unit consisting of a memory unit, a clock pulse generator, a frequency converter in the code, a memory unit and output registers and N comparators.

Description

the second output of the synchronization unit, the third output of which is connected to the starting stroke of the modeling unit of a temperature meter, the output of which is connected to the second input of the Subtractor, the output of the second reference value register is connected to the second input of the comparison unit, the fourth output of the synchronization unit , the block of task conditions, the block of registration and the input of the record of the memory block, the third and fourth information inputs of which are connected respectively to the outputs of the block setting boundary conditions and the initial conditions setting block, the group of outputs and output registers is connected to the information inputs of the modeling block of the temperature meter and the register block 15521644

and the fifth information input of the memory block, n groups of outputs of which are connected respectively to the first groups of inputs n of comparators, the second groups of inputs of which are connected to the group of outputs of the frequency converter in the code and the group of inputs of the RAM block which is connected to a group of information inputs n output registers, the recording entries of which are connected to the corresponding outputs n comparators, the generator output tact, ,,. the output pulses are connected to the first input element of the decision result generating unit, the output of which is connected to the input of the frequency converter in the code, the write input of the memory unit is connected to the second input of the element And the decision result generating unit.

The invention relates to digital computing and can be used in the construction of computing devices for the automatic solution of problems of the operational management of objects with distributed parameters.

The purpose of the invention is to improve the accuracy of modeling.

FIG. 1 is a block diagram of the device I in FIG. 2 is a block diagram of a temperature controller simulation; in fig. 3 is a block diagram of a modeling unit for a temperature meter; FIG. 4 shows timing diagrams explaining the operation, FIG. 5 is a block diagram of the afterburner simulation units and the main heater; in fig. 6 is a block diagram of a decision result generation unit.

The device comprises a decision result generating unit 1, a boundary conditions setting unit 2, initial conditions setting unit 3, a registration unit k, a synchronization unit 5, a temperature meter modeling unit 6, reference values registers 7 and 8, a subtraction unit 9, a comparison unit 10, a unit 11 simulations of the temperature controller, trigger 12, afterburner simulation block 13, main heater simulation block 14.

five

0

The decision result generating unit 1 contains an AND element 15, a memory block 16, a frequency converter 17 having a 0 s code, a RAM block 18, a clock pulse generator 19 and n comparators 20 and output registers 21.

Block 6 contains a generator 22 clock pulses, the element And 23, the register 24, the counter 25, the block 26 RAM, the comparator 27, the register 28. The block 11 contains the comparators 29 and 30, the element OR 31. Each of the blocks 13 and 14 contains a generator 32 clock pulses, the element And 33, the counter 34, multivibrators 35 and 36, the elements NOT 37 and 38, the elements AND-NOT 39 and 40 and the reversible counter 41.

The device works as follows.

The principle of operation of the device will be considered on the example of the optimal control of the heating of the body or the electrical thermostatting system

small objects. The control object is the temperature field of the thermostat chamber, depending on the ambient temperature bs and internal heat generation, the heat flux (W0, Wm) influences the temperature of the thermostat chamber. By the amount of this heat flux, except for temperature5

15

The 9C influences the intensity of heat exchange with the environment and the mode of operation of the thermostating object (internal heat release). A change in the temperature of the thermostat chamber 0K leads to a change in the input parameter of the sensitive element - the sensor, which outputs the voltage UQJ, proportional to the temperature in, o

At the output of the elements of setting the main and afterburner heaters, the voltages and U oftcp are set, which are respectively proportional to the temperature setting Qcr and the shutdown temperature of the after heaters. Comparison schemes of the main and fosazhnogo channels produce, respectively, voltage

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The error signal Uu, p is fed to the input of the threshold device, the output of which U switches on afterburners. They turn on, as a rule, when the thermostat is turned on, and are turned off by the output signal of the threshold device. Afterburner can be turned on again after a signal is applied to the setup input U

block 10 comparison falls to zero. In this case, the trigger 12 is reset to zero and the block 13 is disconnected from the block 1. The block 13, which simulates the afterburner heaters, switches off again when the solution is repeated, i.e. only with the arrival of the impulse Ј ,.

Block 14 continues to remain connected to block 1, simulating the heating of the object to the temperature of the setting. When the value of the coefficient on the object at the point of sensor connection corresponding to the temperature of the setting, which is set by the value of the installation coefficient from the reference value register 7, is reached, the output signal of the subtraction unit 9 decreases, the output is U0 (v - U child and Uu, p Uoc 20 block 11 so that

block 14 is disconnected from the input of block 1. The values at the nodal points begin to decrease, which corresponds to the cooling of the object due to the influence of the external environment. When the value at the output of the subtraction block 9 reaches a certain value, the block 11 is activated and the block 1 is connected to block 1, and so on. Thus, until the end of the pulse, the closed system is in self-oscillating mode of operation, stabilizing the values at the level of the temperature sensor at the level of the reference, the reference value coming from the register 7 with the maximum deviation from it by the allowable value. Unit 4 performs measurement at a given point and at a given point in time.

thirty

The signal Uu.e enters the input of the regulating element, which changes the heat flux W0 of the main heater with its signal Up.0.

Block 5 generates a pulse of time. Neither the solution Ј ,, produces the connection of blocks 2 and 3, which set in block 1 the initial and boundary conditions known by the condition of the problem. In addition, the impulse €, with its leading edge, translates the trigger 12 into a single state, the output of which connects unit 13 to the nodal points corresponding to the location of the windings of the afterburner heater. Heating of the object is due to the main and afterburner windings of the heaters. If the value of the coefficient on the object at the point of connection of the temperature sensor is equal to the value of the setting factor specified from the register 8 of the reference value, the output signal

35

40

45

50

When a preparation time pulse arrives from block 5, Ј-, block 14 is forcibly disconnected from block 1. With the arrival of pulse Ј, the process repeats.

By introducing new units and the connections between them, the accuracy of the device is improved. Due to the digital processing of control and information signals, it is possible to achieve a significant increase in the modeling accuracy of optimal control, without accompanying a significant increase in hardware costs.

15

20

25

thirty

25

35

When a preparation time pulse arrives from block 5, Ј-, block 14 is forcibly disconnected from block 1. With the arrival of pulse Ј, the process repeats.

By introducing new units and the connections between them, the accuracy of the device is improved. Due to the digital processing of control and information signals, it is possible to achieve a significant increase in the modeling accuracy of optimal control, without accompanying a significant increase in hardware costs.

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FIG. 3

Claims (1)

A device for solving heat transfer problems, comprising a temperature controller simulation unit, a boundary condition setting unit, an initial condition setting unit, a recording unit, a synchronization unit, a temperature meter simulation unit, the output of which is connected to the first input of the comparison unit, the output of which is connected to the first installation input of the trigger , characterized in that, in order to increase accuracy, a block for modeling the main heater and a block for simulating the afterburner Hai — the revolver, each of which holds two multivibrators, a rectangular pulse generator, an AND element, a binary counter, two NOT elements, two NAND elements and a reverse counter, a chic, two reference value registers, a subtraction unit and a decision result generation unit, consisting of a memory block, a clock generator pulses, a frequency to code converter, a RAM block and output registers, and η comparators, and in each of the main and afterburner heater simulation blocks, the output of the rectangular pulse generator is connected to the first input of the element nta And, the output of which is connected to the counting input of a binary counter, the output of which through the first multivibrator is connected to its recording input and to the first inputs of the first and second elements of And, the outputs of which are connected respectively to the summing and subtracting inputs of the reversible counter, the recording input of which is connected to the output the second multivibrator, the input of which through the first element is NOT connected to the installation input of the reverse counter, the input of the second element is NOT connected to the second input of the second AND-NOT element, the output of the second of the element is NOT connected to the second input of the first AND-NOT element, the output of the first register of the reference value is connected to the first input of the subtraction unit, the output of which is connected to the input of the simulation block of the temperature controller, the output of which is connected to the input of the second element NOT of the modeling block of the main heater, the output of the reversible counter of which is connected to the first information input of the naf block, the second information input of which is connected to the reverse output?: counter of the modeling block: the important heater, the input is second The tent which is NOT connected to the output of the trigger, the second installation input of which is connected to the first output of the synchronization unit and to the inputs of the first element NOT of the simulation blocks of the main and afterburner heaters, the second inputs of the elements of which are connected to SU „„ 1552164 '1552164 to the second output of the synchronization unit, | the third output of which is connected to the input of the start of the simulation block of the Temperature Meter, the output of which is connected to the second input of the subtraction unit, the output of the second register of the reference value is connected to the second input of the comparison unit, the fourth output of the synchronization unit is connected to the inputs of the start of the boundary condition setting unit, the initial condition setting unit , of the registration unit and the recording input of the memory unit, the third 4 fourth information inputs of which are connected respectively to the outputs of the boundary condition setting unit and the block If initial conditions are met, the group of outputs and output registers is connected to the information inputs of the temperature meter simulation block and the recording unit and the fifth information input of the memory block, η output groups of which are connected respectively to the first input groups of η comparators, the second input groups of which are connected to the group of outputs frequency converter into code and with a group of inputs of the RAM block, the output group of which is connected to the group of information inputs η of the output registers, the recording inputs of which s are connected to the corresponding outputs of the η comparators, the output of the clock generator is connected to the first input of the element AND of the unit for generating the decision result, the output of which is connected to the input of the frequency converter into the code, the recording input of the memory unit is connected to the second input of the element And of the unit for forming the result of the solution.