SU902019A1 - Device for transportational warehouse system simulation - Google Patents

Description

The invention relates to computing and can be used in the study and design of systems in which cargo warehousing operations are associated with movement operations between warehouses. Vl3BecTHO a device for modeling the warehouse inventory management system that contains the input flow generating unit, the input address setting unit, the address generation unit, the registration units, the reversible counter, the output flow generating unit, the output address setting unit, the indicator and a group of logic elements P j The device contains models of several warehouses and simulates random input and output flows, however, it does not allow modeling the processes of cargo transportation between warehouses. Closest to the proposed is a stochastic model of a queuing system containing an input flow generator, the output of which is connected to the fold input of the first reversible counter, and an output flow generator, the output of which is connected to the subtraction input of the reverse sign of the reversing counter, and the second input which is connected to the output of the transfer signal from the higher bit of the shift register, the shift input of which is connected to the generator output f2j. The known device simulates queuing systems and storage systems in which random input and output flows and the residence time of requirements (loads) in the system are limited, but it does not simulate the processes of cargo transportation between warehouses. The purpose of the invention is to expand the functionality by simulating the process of transporting goods between warehouses.

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The goal is achieved by the fact that the device containing the input stream generator, the output of which is connected to the input of the addition of the first reversible counter and the generator

the output stream, the output of which is connected to the subtraction input of the second reversible counter and to the first input of the registration unit, the second input of which is connected to the output of the transfer signal. From the higher bit of the shift register, whose shift input is connected to the output of the generator, two and a switching unit whose output is connected to the first

the input of the first element And whose output is connected to the input of the switching unit and to the input of the first reversible counter, whose output is connected to the second input of the first element And, the output of the overflow signal of the first reversing counter connected to the third input of the registration unit, the fourth input of which is connected with an overflow signal output of an expensive reversible counter, the output of which is connected to the first input of the second element AND, the output of which is connected to the input of the second reversible counter and with zero input m MSB of the shift register unit whose output is connected to the second input of the second AND gate, switched inputs and outputs switching unit connected respectively to single-input and zero outputs of corresponding bits of the shift register, the input stream generator output is connected to the fifth input of the recording unit.

The drawing shows the device, the structural scheme.

The device comprises an input flow generator 1, a first reversible counter 2, a registration unit 3, a first AND element, a switching unit 5, a shift register.6, a second And 7 element a second reversing counter 8, an output stream generator 9 and a generator 10.

The device works as follows.

The generator 1 input flow models the flow of goods entering the initial phase of waiting, after

to which requirements are received for the transport phase, and then for the final phase of waiting, after which

They are removed from the system in accordance with the requirements of the final phase.

The operation of the input stream generator 1 consists in the formation of a sequence of pulses in which the pulse time interval is a random variable distributed according to a given law.

The number of loads in the initial phase of the model fixes the reversible counter 2. Its readings increase by 1 when a pulse arrives from generator 1 and decreases by 1 when a pulse arrives from element 14, indicating the transfer of one load from the initial phase to the transport phase.

Reversible counter 2 operates in the range limited by the magnitude of O and K. The outputs of the reversible counter work as follows. If the counter 2 reading is O, then a zero inhibit signal is generated at the output connected to the input of the element I. If the counter 2 reading is K, then an overflow signal is generated at the output of the overflow signal.

The impulse of the input stream generator 1 is recorded by the recording unit 3, as well as by a reversible counter if its reading is less than K. For the generator 1 impulses and the overflow signal, the registration 3 records pulses (weights) that are not received in the initial phase of the system.

The clock generator 10 generates a sequence of pulses that follow at a predetermined interval t (the minimum interval for following the "weights"). For each pulse, a serial shift to the right of shift register 6 is performed. This simulates the movement of goods between warehouses. The total time of movement T depends on the number of work 1 1X bits n of the register 6 shift and G

T pt (1)

By the choice of t, the device coordinates the temporal scales of the requirements and transportation processes.

Claims (1)

The switching unit 5 serves to change the number n of the working bits of the shift register 6. It provides the connection of the element AND t with the first working bit of the shift register 6, specified from the condition (1) (the output of the element 4 and 5 with the 5th single input of the discharge, and the zero output of the discharge with the first input of the element 4). The transition from the initial phase to the transportation phase is carried out in the absence of a zero sign at the output of the reversible counter 2 and in the first working bit of the register 6 of the shift of the busy sign. When these conditions are met, the element AND k supplies a pulse to, the input of the subtraction of the reversible counter 2 and the pulse on which the busy sign (the bit is set to one) is entered into the first working bit of the shift register 6, the number of loads in the final phase is fixed by the reversible counter 8 operating in the range o, t. The arrival of goods from the transport phase is modeled as follows. When the transition conditions in the higher bit of de shift register 6 are met, a unit is written (busy sign and in the absence of a sign of overflow of the reversible counter 8 (at a &l; counter 8) a single signal), element 7 increases the readings of the reversible counter 8 and zeroes the high bit shift register 6 (quits the sign of occupancy). If the sign of the last discharge is not extinguished, and the signal of the clock generator 10 began to shift the bits of the shift register b, then the sign is taken from the register 6 of the shift and goes to block 3 of the register and to count the number of cargoes not transferred from the transportation phase to the final phase. The output stream generator 9 operates similarly to the input stream generator 1 and differs only in the distribution function of the random pulse interval. The pulses of the generator 9 go to the registration unit 3 and also to the subtract input reversible counter 8, from which the sign of zero gives with the block 3 of registration to account for unmet requirements in the output stream. The information entered into registration unit 3 allows one to control all phases of cargo movement in the model, as well as to fix deviations from the specified order of cargo handling in the system: refusals to receive goods into the initial phase, when transferring goods from the transport phase to final and in delivery of goods from a sistek. Based on this information, it is possible to analyze the operation of the system for various types of input and output streams, to estimate the necessary volumes of warehouses and the parameters of the phase of cargo transportation. The proposed device allows to model a wide class of transport and storage systems, the functioning of which is significantly affected by the operations of transporting goods between warehouses. In addition, the device can be used in the design of complex transport and storage systems. When it is applied, the corro. The work is removed. The need for field experiments and design quality is compromised by a reasonable “selection” parameter of transport and storage systems, and the optimal operating conditions for transport and storage systems determine the best service disciplines. The invention includes a device for simulating transport and storage systems, comprising an input flow generator, the output of which is connected to the fold input of the first reversible counter, and an output flow generator, the output of which is connected to the subtracting input of the second reverse counting tab and the first input of the recording unit, the second input of which is connected with the transfer signal output from the higher bit of the shift register, the shift input of which is connected to the generator output, characterized in that, in order to expand the functionalities in Possibilities due to the simulation of cargo transportation processes Between warehouses, it entered 1 "1 two elements AND and a switching unit, the output of which is connected to the first input of the first And element, the output of which is connected to the input of the switching unit and to the subtraction input of the first reversible counter, whose output connected to the second input of the first element AND, the output signal of the first signal of the first. reversible counter connected to