SU1229774A1 - Device for simulating transport system - Google Patents

Abstract

The invention relates to computing and can be applied to investigate the quality of the functioning of transport systems, consisting of a chain of five branches, of which the third and fourth branches are connected in parallel. The purpose of the invention is to extend the functionality by redistributing the flows in the corners in case of failure of the branches of the transport system. The device contains five random voltage generators, a reference voltage source, five comparison circuits, two pulse generators, five models of transport system branches, two frequency dividers, two one-oscillators, an OR element, and a source of unit voltage. According to the intensity of the traffic flow modeled by the device, the quality of functioning of the transport system is judged. 3 il. (L to yu

Description

I

The invention relates to the field of computer technology and can be applied to investigate the quality of the functioning of transport systems, which are a chain of five branches, of which the third and fourth branches are connected in parallel.

The purpose of the invention is to expand the functionality due to the redistribution of flows in the nodes in case of failure of the branches of the transport system.

FIG. 1 shows a functional diagram of a device for modeling a transport system; in fig. 2 shows a transport system; in FIG. 3 - functional scheme of the model branch of the transport system.

The device contains five random voltage generators 1, a source of the reference voltage 2, five comparison circuits 3, the first 4 and second 5 pulse generators, five models 6 branches of the transport system, the first 7 and second 8 frequency dividers, the first 9 and the second 10 one-shot, the element OR 11, the source 12 of a single voltage. Each model 6 branches contains the first 13 and second 14 elements And the reversible counter 15, the decoder 16, the one-shot 17, the encoder 18 and the counter 19.

The device works as follows.

The counters 15 and 19 of all models 6 are pre-zeroed. Each generator 1 generates an implementation of a stationary random voltage variation process, the instantaneous values of which have a given distribution law, and outputs the voltage to the second input of the corresponding comparison circuit 3, to the first input of which the reference voltage enters source 2, the signal at the output of each comparison circuit 3 has a logic level 1, when the voltage at the second input is greater than the voltage at the first input, and the logic level is O, otherwise tea. Signals 1 and О reproduce, respectively, the operational and inoperative state of each branch of the system and arrive at the third inputs of the cipher) of 18 models 6,

Generator 4 generates rectangular pulses of a constant and sufficiently high following frequency to the inputs.

2297742

counters 19 models 6, generator 5

It supplies the second input of the second element of And 14 models 6, rectangular

ten

3

I

pulses with a following frequency proportional to the intensity of the traffic flow at the input of the transport network. Each model 6 reproduces the operation of a certain branch of the transport network, and if the branch is unique between nodes, a logical 1 signal is sent to the fifth input of the encoder 18. The possible input and output states of the encoder 18 are shown in the table. I

Note. X is an arbitrary input state,

In the initial state, the contents of the reversible counter 15 is zero. At the first output of the decoder 16 there is a logic level 1, on the second - the logic level O, on the first, third, fourth and fifth inputs of the encoder 18 - the logic level 1, on the second input of the decoder 18 - the logic level O, on the output of the encoder 18 and the output element And 13 - the level of logical O.

The rectangular pulses arriving at the second input of the element I 14 from the output of the generator 5 are passed to the summing input of the reversing counter 15, since the first input of the element 14 has a logic level 1. After the counting, the counter

15 M pulses (Mj is the maximum number of moving transport units that can be within branch 6,) decoder 16 outputs a single signal to the second input of the encoder 18; from which the single signal goes to the first input of the And 13 element.

The input of the counter 19, operating as a frequency divider, from the output of the generator 4 receives rectangular pulses with a constant frequency. follow up. The signals at the output of counter 19 are a sequence of square pulses, the frequency of which is proportional to the maximum intensity of the traffic flow at the output of branch 6j. The pulses through the element And 13 are fed to the input of the one-shot 17, which generates a sequence of pulses delayed in time with respect to the pulses at the input. If the pulse frequency at the summing and subtracting inputs of counter 15 are equal, then the contents of this counter remain constant and equal to Mj. This simulates the operation of branch 6i of the transport system in normal mode.

When imitating the failure of branch 6j, a zero signal arrives at the third input of the encoder 18. At the output of the encoder 18, a zero level signal is also formed, blocking the operation of the element I 13, therefore the reversible counter 15 operates only in the summation mode. After counting the M pulses (M M) by the counter 15, the decoder 16 outputs a zero signal on the first output, the signal on the second output does not change. The number M corresponds to the maximum number of transport units which have stopped one after the other, which can be located on branch 6, awaiting the restoration of its operational state. In this case, the And element 14 blocks the arrival of pulses at the summing input of the reversible counter 15, the contents of which do not increase during the recovery time of the operational state of the branch 6j. In this way, the accumulation of transport units in the failed branch 6j and the occurrence of a break in the movement schedule are simulated.

When the operative state of branch 6 is restored, the signal at the third input of the encoder 18 changes its value from zero to one 2297744

nothing. at the same time, the signal at the first output of the decoder 16 has a logic level O, the second output has a logic level I. 5 If the signals at the fourth and fifth inputs of the encoder 18 have a single value, then with this combination of signals at the inputs of the encoder 18, the signal at its output takes one value. At the output of element And 13, rectangular pulses appear. These pulses, delayed by a single vibrator 17, are fed to the subtracting input of a reversible counter J5 15, whose content decreases by one with the arrival of each pulse, imitating the resorption process of stopped transport units as a result of their transition to the next branch. When the contents of counter 15 are reduced to the value of Mj, branch function 6 will start simulating | in normal mode. This simulates the recovery of motion 5 graphics. When the subsequent branch 6j of the system under study is not able to accept transport units, then the fourth input of the encoder 18 receives the level of logic O. A logical O appears at the output of the encoder 18, which leads to filling the reversible counter -15 to the value M, similarly to as it happens when imitating branch 6 failure,. This simulates the spread of -5 wound rupture movement.

The model of branch 6 models the branching of the transport stream into two components. The second input of element 14 receives square pulses with a frequency that is proportional to the intensity of the transport stream at the entrance of wind 6. The operational state of this branch of the transport system is simulated if the third input of the encoder 18

a single signal is received, an inoperable state — if the signal is zero. When imitating a workable state, square-wave pulses appear at the output of a single-vibrator 17, the frequency of which is proportional to the intensity of the traffic flow at the output of branch 6, j. The pulses at the output of the one-vibrator of the 5-torus 17 model 6 are absent, when the outputs of the decoders 16 models 6j and 6c present a zero potential. Thus imitated

the possibility of receiving transport units by branches 6, and 6i,. At the second output of model 6, a zero signal is present when simulating the operational state of branch 6, a single signal at the same output appears when imitating the state when branch 6 is unable to accept transport units. The output of the one-shot 17 model 6 is connected to the information inputs of frequency dividers 7 and 8, the division ratio of each of which is inversely proportional to the intensity of the traffic flow at the inputs of the branches 63 and 6 c, respectively. The rectangular pulses from each code of each of the 7 and 8 frequencies are fed to the inputs of one-shot 9 and 10, respectively. Single vibrators 9 and 10 are used to form and accomplish short rectangular pulses.

the functioning of models 6j and 6 is basically the same as the functioning of the model. If the signal at the second output of models 6j or 6i has a single value, then the division factor of the corresponding divider 7 or 8 frequency is equal to the specified one. At zero value of the same signal. the division factor of the corresponding frequency divider 8 or 7 is reduced to unity. This corresponds to the fact that in case of failure and filling of the branch 63 (6j), the entire transport flow is directed through the branch 6 (6). The third input of the model b is connected to the output of the element OR 11.

The frequency of the pulses at the output of the element OR 11 is proportional to the sum of the intensities of the transport flows at the input of the branch 6. By the intensity of the transport flow at the output of the system, one can judge the quality of its functioning.

The change over time of the intensity of the transport stream at the output of the system under study during the simulation is recorded by standard equipment, for example, an H0115 loop oscilloscope. The results of the simulation are computed on a computer using standard programs for calculating the characteristics of the quality of the functioning of transport systems, for example, the average value of the parameter of the system failure rate.

,,

ten

15

20

25

thirty

35

40

45

50

55

Claims (1)

Invention Formula A device for simulating a transport system containing five generators of random voltage generators, a source of reference voltage and five comparison circuits, the first inputs of which are connected and connected to the output of the voltage source, and the outputs of the random voltage generators are connected to the second inputs of the same name failure schemes, differing so that, in order to extend the functionality due to the redistribution of flows in the nodes in case of failure of the branches of the transport system, two pulse generators were introduced into it, A frequency divider, two single vibrators, an OR element and five branch models, each of which Toptjx consists of two AND elements, a counter, a reversible counter, a decoder, a single vibrator, and an encoder; in the branch model, the output of the encoder is connected to the first, and the output of the counter - to the second input of the first element I, the output of which is connected to the input of a single vibrator, the output of which is connected to the subtractive, and the output of the second element I to the summing inputs of a reversible counter whose output is connected to the input of the decoder, the first output of which The second output of the decoder is connected to the encoder's input of the same name, the third input of the encoder of each branch model is connected to the output of the corresponding comparison circuit, the inputs of the branch model counters are connected to the output of the first pulse generator, the second input of the second element And the first model Petvia is connected to the output of the second pulse generator; the output of the one-shot of the fifth branch model is the output of the device; the fourth input of the encoder; the first model of the branch is connected to the output in the decoder of the second branch model, the fifth inputs of the encoders of the first, third, fourth and fifth branch models are connected and connected to the source of a single potential, the output of the one-vibrator of the first branch model is connected to the second input of the second element And the second model of the branch, the fourth encoder input of which is connected with the input of setting the division factor of the second frequency divider and connected to the output of the decoder of the third branch model; the fifth input of the encoder of the second branch model is connected to the input of setting the division factor of the first divider frequency and connected to the output of the fourth encoder model branch information inputs of frequency dividers connected to the output of the second monostable branch model, outputs of the first and second frequency dividers are connected to inputs odnoimen One-vibrator outputs whose outputs are connected to the second inputs of the second elements of the third and fourth branch models, respectively, the fourth encoder inputs of the third and fourth branch models are connected and connected to the output of the decoder of the fifth branch model; the outputs of the third and fourth branch models are connected to the inputs element OR whose output is connected to the second input of the second element And the fifth model of the branch.   about ff  % Wnj Compiled by A.Sherenkov Editor L.Gratills Techred G, Gerber Corrector V.But ha Order 2451/49 Circulation 671 Subscription VNIIPI USSR State Committee for inventions and discoveries. 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4