SU1251122A1 - Device for simulating physical fields - Google Patents

Abstract

The invention relates to the field of analogue computing technology and can be used to solve problems of optimal placement of the source of a physical field, taking into account the restrictions on the values of the physical field at controlled points in the area and restrictions on the location of the source in the area. The purpose of the invention is to expand the functionality by allocating zones of possible source placement. New in the proposed device is the presence of block 15 for setting limits, counter 14, two comparison blocks I2 and 13, elements AND and OR 10 and 11, pulse generator 6, using the device in solving optimal design problems allows to increase the reliability characteristics of the designed technical devices. and reduce the time and material costs of the design, 6 Il. c (Lt Tt-Tt total of N9 Bffo MlXOdW Uft (fN Mtn4 “M

Description

The invention relates to analog computing and is intended to highlight areas of possible placement of a source of a physical field, taking into account restrictions on the field values at several control points and the location of the source to be located in the area.

The purpose of the invention is to expand the functionality by allocating zones of possible source placement.

It is necessary to allocate an area (subdomain) of a possible source location in a given area, such that for any source location in this area the following restrictions apply:

a) the values of the field in the controlled points of the area should not exceed the preset values;

S) the placed source should not fall into the areas occupied by fixed sources and areas of prohibition, given from constructive technological and other requirements;

B) the source should not be closer to the specified distance from the boundary of the area in which it is located.

Fig. 1 shows a block diagram of a device for modeling various fields; Fig. 2 shows a block for specifying the intensity of sources of a physical field; Figures 3-4 are comparison units; Fig. 5 illustrates a constraint setting unit; Fig. 6 is a timing diagram for explaining the operation of the block for specifying the intensity of the sources of the physical field.

The device for modeling physical fields consists of switch 1, R-grid 2, block 3 setting boundary conditions, block 4 digital-analog converters, block 5 comparing, pulse generator 6, adder 7, block 8 setting the intensity of the physical field sources from block 9 , the element H 10, the element OR 11, the blocks 12 and 13 of the comparison, the counter 14, the block 15 setting the limits.

Switch 1 is a standard (n + 1) -bit (n is the number of R-grid nodes) sequential shift register, which has one information and one clocking

entrance. It is intended to arrange alternately switching digital-to-analogue converters 16 of block 4 (FIG. 1) by codes received from the 1-shift switch of switch I. The zero bit of this register is not associated with digital-to-analog converters) supplying 1 to it, which is then moved through the register, by applying n clock pulses, which allows the output of the switch to have the following sequence of codes

100 ... O 010 ... O 00 ... O

five

0

five

0

five

20

0

five

000 ... I

(, J

P

connecting alternately digital transmitters converters 16 block 4.

The R-grid block 2 is a conventional grid model, which is used to simulate a physical field created by fixed and moving sources, as well as by boundary conditions.

Unit 4 of digital-to-analog converters is a set of standard identical digital-to-analog converters 16, functionally. independently of each other. The task of each of the converters is to convert the code corresponding to the intensity of the source into a current-analogue of the source of the physical field.

Comparison unit 5 is a unit for allocating the maximum potential value among constant analog values.

Block 6 is a standard pulse shaper designed to generate a pulse in analog value received from block 5 compared to one.

Block 7 adders is a set of standard identical adders 17, operating independently of each other,

The unit 8 specifies the intensity of the sources of the physical field (Fig. 21 contains a clock generator 8 and its waves, an element 19, an element 20, a trigger 21, a start block 22, a group of registers 23, a trigger 24, a group

312

digital-to-analog converters 25, the first to fourth elements 26-2 delay.

Block 9 - the recording device is a standard alphanumeric device.

Comparison unit 12 for the equality of two numbers of FIG. 3 contains registers 30-31, including flip-flops 32-33, comparison circuit 34 for equality, containing the elements OR 35 and AND 36. Two registers 30 and 31 are supplied if equal, then a signal appears at the output of AND 36.

Block 13 of comparison of several numbers for equality (Fig. 4) contains blocks 37 of comparison for the equality of two numbers, similar to block 12, the outputs of which are connected to the element OR 38 A signal appears at the output of the OR 38 element only if at least one of the blocks 37 numbers, filed at its inputs, are the same.

Block 14 is a standard counter.

The constraint setting unit 15 (FIG. 5) contains two groups of registers 39-40, a register 41 and a group of digital-to-analog converters 42.

Preparing the device to work.

Each node of the R-grid is assigned the number 1,2, ... n (Fig. 1). Next, from an input device (for example, a keyboard), codes corresponding to the initial data are entered into registers 23 of block 8 (FIG. 2) - the intensity of fixed sources, and in registers 24 - the intensity of the source being placed. In registers 39 of block 15, the codes corresponding to the permissible values of the physical field are entered into registers 40 — the numbers of the prohibition points: i.e. node numbers of the R-grid, placing the source in which contradicts the limitations on the location of the source to be placed (limit 5.8). Register 41 records the total number of R-grid points, i.e. number of

The device. Works as follows.

When the block 22 is turned on, the digital blocks of the device are installed in O (FIG. 2): switch 1, blocks 12 and 13 of the comparison, counter 14, and digital-analogue converters.

distributors 16 (figure 1). Communication Installation O (Fig. 2 is not shown in Fig. 1).

The impulse from block 22 also arrives at the input of delay element 26 and sets trigger 21 to state 1 (FIG. B). This provides the input to the inputs of registers 23-24 of block 8 and registers 39-41 of block 15 of a signal that allows the contents of registers 23 to be sent to digital-to-analogue converters 25, which convert codes to currents-analogues of stationary sources and the contents of register 24 to digital-to-analogue converters 16 of block 4, which convert code in the current analog of the source being placed; the contents of registers 39 are digital-to-analogue converters 42 that convert codes into voltages corresponding to the permissible values of the physical field; the contents of registers 40-41, respectively, to the input registers of the comparison blocks 12 and 13. The input register, for example, in block 12 is register 31.

In addition, the same pulse from block 22 is fed to the input of the element 29 delay, and then to the first input element And 19, the second input of which receives the clock pulses from the generator 18 pulses. This allows the output element AND 19 (FIG. 2) to provide a single pulse to the zero bit (not associated with any digital-to-analog converter of register 1, i.e., no converter 16 is yet to be included.

Clock pulses (figure 2) from the generator 18 pulses arrive at the element And 20, to the second input of which, through the delay element 28, 1 comes from the trigger 21. This ensures the passage of the clock pulses through the element 20 and 20 (figure 2) to the switch 1, element 10 And, the counter 14.

The arrival at the clock input of the switch 1 of pulses makes it possible to generate codes for n pulses.

100 010

Oh oh

000 ... 1

enabling each time one by one to turn on digital-to-analog converters 16 of block 4, associated respectively with nodes I, 2, .., n To the grid / figure.l) “To the information inputs of each digital-to-analog converter I6 of block 4 filed code corresponding to the intensity of the placed source. Sequential switching on of one converter with 16 codes supplied from switch 1 allows converting codes corresponding to the intensity of the circulated source to an analogue value — the current imitating the source of the physical field. Since the outputs of transducers I6 are connected to the nodes of the R-grid, the current corresponding to the moving source is supplied in series to the nodes 1,2, ..., n of the R-grid (Fig. 1), which together with the boundary conditions and stationary sources form n -Various physical fields. Each field received is analyzed by feeding from each node of the R-grid of potentials corresponding to the value of the physical field, adders 17, block 7, to the second input of which, from the digital-to-analog converters 42 of block 15, the admissible values of fields are supplied. From the output of block 7 of adders, the mismatch signals are fed to the input of block 5 of the comparison, which allows to select the maximum value of the signal among several filed ones; at the entrance. From the output of unit 5 of the comparison, the selected signal is fed to the input of the pulse generator 6; from there to the element OR II. Another input of the OR element 11 of the comparison unit 13 is given a signal if the contents of counter 1.4 (the K-grid node number to which the source is fed coincides with one of the I node numbers of the grid to which the input of the source is prohibited. if the field formed on the model is not satisfied with the given constraints, i.e., (, 25

..., p), where U; - gender value

.-th1-th node R-ceTKHj and Uj - given

a valid value, the pulse former 6 generates a pulse, which will ensure the triggering of the element OR 11 and the output of the element

The SH 1 1 1 signal will be sent to the I 10 element, which, together with the clock pulse sent from block 8 to the I IO element, will turn off the registration block 9. Similarly, if the node number where the source coming from counter 14 to comparison circuit 13 is placed coincides with one of the inhibit node numbers stored in the input registers of comparison unit .3, then from the output of comparison unit 13 to the input of the element OR 1 a signal is received to ensure the operation of the element OR II. In this case, from the output of the element OR I, a signal is sent to the element AND 10, which, together with the clock pulse fed from block 8 to the element 10, disconnects the registration block 9. If, however, in no other case, the OR element 1 fails, then the number of clock pulses counted by the counter 12 and corresponding to the number of the R-grid node into which the source is placed is recorded by the recording unit 9. Many such points form the zone of possible placement of the source of the physical field.

In order to automatically stop the operation of the device, a comparison unit 12 is entered, on one input of which from the counter of the counter 14 is fed the node number of the R-mesh into which the source is placed, and to the other input of block 12, the total number of nodes R- mesh. If the signals supplied to the inputs of the comparison unit 2 coincide, then the output of the unit 12 sends a signal to the input of the unit 8 to set the intensity of the sources of the physical field, which goes to the delay element 27, which is intended to explode the execution time of the operations (fig.b) and then to the trigger 21, which is set to the state O (FIG. b). In this case, the supply of clock pulses through the element 20 to the switch, the element 10 and the counter 14 stops 5, which corresponds to the end of the task.

Thus, block 9. Registration records the numbers of the nodes of the R-mesh. where it is possible to place the source of the physical field, at that the restrictions are fulfilled both on the values of the physical field in the controlled points, and

712

and the location of the source in the area (restrictions a, 8).

Claims (1)

The invention extends the functionality of the device. Invention Formula A device for simulating physical fields, containing an R-grid, a switch, a block specifying boundary conditions, the output of which is connected to the boundary nodes of an R-grid, a block of digital-analog converters, whose outputs are connected to internal nodes of the R-grid, recording block, a block of choice the maximum and the unit for setting the intensity of physical field sources, the switch outputs are connected to a group of clock inputs of the block of digital-analog converters, the block for setting the intensity of sources for the physical field contains a clock generator pulses, the start block, whose input is the device start input, the first element, both the first and second delay elements, the trigger and the register group, the output of the clock generator connected to the first input of the first element And, the outputs of the first and second delay elements are connected to The first and second inputs of the trigger, the information inputs of the registers of the group of the block specifying the intensity of the sources of the physical field are the first group of information inputs of the device, characterized in that opportunities due to the allocation of possible source placement zones, the first and second comparison blocks, a counter, a pulse shaper, a block of adders, an AND element, an OR element, a restriction setting unit, and a second element of the intensity field of physical field sources are entered into it And, the third and fourth delay elements, a register and a group of digital-to-analog converters, a block for specifying constraints includes a register, two groups / registers and a group of digital-to-analog converters, and in the block ADANI intensity sources physical floor latch output is connected to the input of the third delay element inputs IS Read Enable Register and the group of registers, and also connected to the enable input of the read register and the first register and 2a The second group of the restriction setting unit, the output of the starting block of the intensity setting of the sources of the physical field are connected to the input of the fourth delay element, the output of which is connected to the second input of the first element And whose output is connected to the clock input of the switch, in the intensity setting block sources of the physical field, the output of the third delay element is connected to the first input of the second element I, the second input of which is connected to the output of the clock generator, the outputs of the group registers of the physical field intensity source sources are connected to the inputs of digital-to-analog converters of the group whose output groups are connected to the internal R-grid nodes, the input of the physical field intensity source register register is the input of the source intensity setting, and the output is connected to the information inputs of the digital-to-analog converter unit, the output of the first comparison block is connected to the input of the second delay element of the input unit the intensity of the physical field sources, the output of the second comparison unit is connected to the second input of the OR element, the output of the register of the restriction setting unit is connected to the second input of the first comparison unit, the outputs of the registers of the second group of the restriction setting unit are connected to the input group of the second comparison unit of the device, information the inputs of the first group of task block registers are limited to the second group of information inputs of the device, the third group of information inputs of which is the group of information inputs of the second group register, the input of setting the number of nodes of the device R-grid is connected to the information input of the register of the restriction setting block, the outputs of the registers of the first group of which are connected to the inputs of digital-analogue converters of the group whose outputs are connected to the first group of inputs of the block of adders, the second group the inputs of which are connected to the internal nodes of the R-grid, the outputs of the block of adders are connected to the inputs of the block of selection of the maximum, the output of which 912511 through the pulse generator, it is connected to the first input of the OR element, the output of which is connected to the first input of the AND element, the output of which is connected to the first input of the recording unit, the output of the second element AND the source intensity setting unit 2210 the physical field is connected to the information input of the switch, with the second input of the element I and with the input of the counter, the output of which is connected to the first input of the first comparison unit, to the input of the second comparison unit and to the second input of the registration unit. Enter the intensity of the source to be placed. Enter the intensity of the input source (HUKoS To uloka H blocks 1U, u EastanVka 0 Fmg.2 31 12 To block 8 37 Enter the number of points to the grid From SjnoKo. eight K 5k (/ 2 fplAZ.5 Start from 5l. 22 HcmanaSna Oh F / l trigger JMn jjJbca6ni generator Jlj Element  I19 P 1 AMPULSo8 Yoke element Stop {to trigger 21  e / pulses L. FIG. 6