SU1007111A1 - Device for calculating modes of pipeline networks - Google Patents

Abstract

1. A DEVICE FOR CALCULATING THE MODES OF PIPELINE NETWORKS, which contains a memory block of resistances of branches, whose address input is connected to the first output of the control unit, and the output - to the input of the calculation unit, in order to improve the accuracy of the calculation, it contains the block of memory of node numbers, the block of memory of branch numbers, the block of memory of balancing influences, the block of calculating of nodal heads, the block of memory of nodal heads, element AND, four elements OR, switch of balancing effects unit, the storage unit of the node costs and the comparison unit, the first output of the control unit is connected to the first inputs of the first and second OR elements, the outputs of which are respectively connected to the address inputs of the memory blocks of the node numbers and balancing influences, the first output of the control unit is connected to the first input element, AND, the output of which is connected to the first input of the third element OR, the output of which is connected to the address input of the nodal memory block; heads, the second output of the control unit is connected to the first control to it the input of the balancing switch, to the address inputs of the memory blocks of node expenses and branch numbers and to the second input of the third OR element, the output of which is connected to the address input of the memory block of node heads, the third and fourth outputs of the control unit are connected to the control inputs of blocks respectively calculating the output head and balancing factors; the inputs of all memory blocks. combined with and connected to the fifth output (RUN of the control unit, the output of the branch number memory unit is connected to the second input of the second OR element and the second input of the first OR element, the output of the number memory module is connected to the second control input of the balancing switch and with the second input of the element I, the first input of the calculating unit of the balancing effects is connected to the output of the memory block of the nodal heads and to the first input of the comparing unit, the output of the block for calculating the balancing influences is connected to. the input of the memory block balancing effects, the output of which is connected to the information input of the switch balancing effects the output of which is connected to the second input of the block

Description

the number of node pressures, the first input of which is connected to the output of the block of node memory, you-. the stroke of the node pressure calculator is connected to the second input of the fourth OR element, the output of which is connected to the information input of the node pressure memory block, the output of the node pressure calculator is connected to the second comparison unit, the control input of which is connected to the sixth output of the control unit, and the output with the input of the control unit, the first input of the fourth element OR, and the information inputs of the memory blocks of the node numbers, branch resistances and node costs are. device inputs, device output is the output of the storage block of node pressures.

2. The device according to claim 1, which is designed so that the calculating block of balancing effects consists of an input register, three adders and a non-linearity block, the outputs of the input register being connected to the inputs of the first adder, the output of which is connected to

07111

the first input of the nonlinearity setting unit, the first inputs of the second and third adders are combined and connected to the output of the nonlinearity setting unit, the second inputs of the second and third adders are connected to the corresponding outputs of the input register, the first, second inputs of the input register and the second input of the nonlinearity setting unit are respectively the first , the third and second inputs of the balancing effects calculator, and the outputs of the second and third adders are combined and are the outputs of the balancing calculator. zdeystvy,

3. The device according to claim 1, in which, the unit for calculating the nodal heads consists of an adder and a division unit, the input of which is divisible is connected to the output of the adder, the inputs of the adder and the input of the divider of the division unit are respectively the first , the second and third inputs of the unit for calculating nodal heads, and the output of the dividing unit is the output of the unit for calculating nodal heads.

one

The invention relates to digital computing and can be used autonomously, as well as as part of a computer complex for calculating the established modes of hydraulic, gas, ventilation, etc. networks.

A device for calculating pipeline networks is known in which a pipeline section is modeled by a circuit comprising a differential amplifier, a potentiometer, a diode bridge, and a diode-resistive circuit of a piecewise linear approximation of the OZ pipeline characteristics.

The disadvantages of this device include the need for autonomous power sources for each model of the site, manual input of information about the hydrodynamic resistance of pipelines, as well as the low accuracy of the simulation due to the instrumental error of the analog elements.

A device for calculating piping networks is known, which contains a current source, a load element on which a voltage drop proportional to the current is created, a quad squared as a MOSFET transistor, a resistor element and a potentiometer for setting the hydrodynamic resistance value C21. ,

The disadvantages of this device. It should be attributed to the low speed of solving problems due to the manual setting of the value of hydrodynamic resistances, as well as low (analog) accuracy of the solution.

The closest in technical essence to the present invention is a device for calculating the modes of pipeline networks, which contains a dial-up field, the branch models whose inputs are connected via a switch to the outputs of the block calculating balancing effects VIY, the memory module of the resistance of the branches, the address that is connected to the output of the block control and control input of the switch, and output to the input of the balancing effects calculator, the outputs of the branch models are connected to the group of inputs of the field floor and Res switch unit inputs G:, calculating the counterbalancing effects disadvantages of the known devices. are the manual set of the topology of the simulated pipeline network and the unproductive time spent on preparing the problem for the solution, as well as the presence of a dial floor with unreliable mechanical contacts. In addition, the device is characterized by low decision accuracy, which is determined by the accuracy of analog, computational elements. The aim of the invention is to improve the accuracy of calculations. The goal is achieved by the fact that a device for calculating the modes of pipeline networks containing a block of resistance of branches, whose address input is connected to the first output of the control unit, and an output to the input of the balancing effects calculator, has been entered branch numbers, memory block of balancing influences, node pressure calculation block, node pressure memory block, AND element, four elements OR balancing action switch, node memory block and a comparison unit, the first output of the control unit is connected to the first inputs of the first and second OR elements, whose outputs are respectively connected to the address inputs of the memory blocks of the node numbers and balancing influences, the first output of the control unit is connected to the first input of the AND element, the output of which is connected to the first input of the third OR element, the output of which is connected to the address input of the memory block of node pressures, the second output of the control unit is connected to the first control / input of the switch balancing their effects, to the address inputs of the memory blocks of node costs and numbers of them, and to the second input of the third OR element, the output of which is connected to the address input of the memory block of node heads, the third and fourth outputs of the control unit. are connected to the control inputs of the blocks calculating node pressures and balancing influences, the inputs of all blocks are paired and connected to the fifth output of the control unit, the output of the memory block of branch numbers is connected to the second second element OR and the second input of the first The OR element, the output of the memory block of node numbers is connected to the second control input of the switchboard balancing effects and the second input of the AND element, the first input of the balancing action calculator connected to the output of the memory node node pins and the first input of the comparator, the output of the balancing calculator impacts connected to the information input of the memory block balancing effects, you-. the stroke of which is connected to the information input of the balancing switch, the output of which is connected to the second input of the nodal calculator, the first input of which is connected to the output of the nodal flow memory, the output of the nodal calculator to the second input of the fourth element OR, the output of the second connected to the information input of the node pressure memory, the output of the node pressure calculator is connected to the second input of the comparator, the control input of which is connected to the sixth output The control unit and the output with the input of the control unit, the first input of the fourth element OR, and the information inputs of the memory blocks of node numbers, branch resistances and node costs are the device inputs, the device output is the output of the node head memory ,. The balancing effects calculation block consists of an input register, three adders and a nonlinearity setting unit, the outputs of the input register are connected to the inputs of the first adder, the output of which is connected to the first input of the nonlinearity setting unit, the first inputs of the second and third sum of tori are combined and connected to the output block specifying nonlinearity, the second inputs of the second and third adders are connected to the corresponding outputs of the input register, the first, second inputs of the input register and the second input of the task block The linearities are the first, third and second inputs of the balancing effects calculator, respectively, and the outputs of the second and third adders are combined and are the output of the balancing effects calculator. The node pressure calculator consists of an adder and a division block whose input is connected to the output of the adder, the inputs of the adder and the divider 6jjoKa divider are the first and second inputs of the node calculator, and the output of the division block is the output of the calculator nodal pressures. FIG. 1 shows a diagram of an apparatus for calculating modes of pipeline networks; in fig. 2 is a block diagram of the calculation of balancing effects; in fig. Figure 3 shows the block head calculation; in fig. one of the possible variants of the circuit implementation of the control unit; in fig. 5 one I.Z of possible variants of circuit realization of the switchboard of counterbalancing influences; in fig. 6 is one of the possible variants of the circuit implementation of the block as compared to. The device (Fig. 1) consists of block 1 of memory of branch resistance, block 2 of control, block 3 of calculating balancing effects, blockade of memory of node numbers, block 5 of memory of branch numbers, block 6 of memory of balancing influence, block 7 of calculating nodes heads, block 8 of memory of node headings of the OR elements, element I 13, switch I of balancing influences, block 15 of memory of node expenses and block 16 of comparison. The balancing effects calculating unit 3 (FIG. 2). Contains the input register 17, the adder 18, the non-linearity setting unit 19, adders 20 and 21. 1 The node 7, the calculation of the nodal pressures (Fig. 3) contains the accumulating adder 22 and the division unit 23. The control unit 2 (FIG.) Contains a clock generator 24, AND elements, a command counter 33, AND elements, a branch number counter 39, a node number counter kQ, blocks k} and 2 comparisons, and triggers 3 and 44. Balancing action switch 14 ( Fig. 5) contains multi-bit adders 45 and 46, an adder 47 modulo two, elements -I 48 and 49, and an OR element 50. Comparison unit 16 (Fig. 6) contains adders 51 modulo two, the number of which is determined by the number of compared binary bits, the element OR 52, the trigger 53, the element And 54 and the element 55 of the delay. The device works as follows. A pipeline network containing V branches and q nodes is described by a system of equations containing a q-1 linear equation of the form (1) where Q is the flow in the mth branch, flowing to or flowing out from node B; Qp-node flow (sampling) in the node E; . Pp is the number of branches converging in y3jfe 1; and J-q + 1-nonlinear equations of the form 5, I. (2) where N. is the pressure drop on the mth segment (branch) of the network; S is the number of branches forming the contour; oL, is the branch hydrodynamic resistance; n is the number determined by the nature of the flow movement. The source (for the calculation data are the heads Hg generated by the pumps in certain network nodes, called the master nodes, the nodal costs Qg, the wind resistance 1 | and the network topology information. Before entering the initial data into the device, all the branches and nodes of the network are numbered. Each the branches are assigned the sequence number t ()), 7i each node is assigned the sequence number F (). Topology information provided by the node and network number; is stored in the node number memory block and the branch number memory block. In the memory cell of the block t of the memory of the node numbers in the first input, the numbers of the nodes between which the network branches are enclosed are recorded. Thus, in the first memory cell of the memory block C of the node numbers are recorded the numbers of two nodes, between which the first branch of the network is enclosed in the second memory cell - the numbers of two nodes, between which the second branch of the network is located, etc. Thus, in block k, the node number memories are filled with V memory cells with information about the nodes of the incident network branches. In block 5 of the memory of the branch numbers, the first input records the branch numbers incident to the network nodes. Thus, in the first cell of the memory of the block 5, the memory of the branch numbers .5 is recorded from the number of all the branches converging in the first node, etc. In total, in block 5, the memory of branch numbers is filled with q some memory with information about the branches of the incident network nodes. In the memory unit 1 of the resistances of the branches, the values of the hydrodynamic resistances of branches / (w, ..., V) are recorded at the first input. In total, in the memory block 1 of the branch resistances, V cells are filled with information on the resistance values of the branches of the network of the calculated network. In block 15, the nodal-expense memory at the first input is recorded VE, LICHICH of the nodal expenditure Qp. In the memory block 8 of the node pressures, the first input through the first input of the element OR 9 enters information about the pressures in the master nodes of the network, i.e. those nodes in which the pumps are turned on. At that, the cells of the block 8 are filled, the addresses of which coincide with the numbers of the master nodes of the network. The numbers of master nodes of the network are not recorded in block 5 of the memory of branch numbers, since the pressures at these nodes are not subject to calculation. After the initial data is entered into the corresponding blocks of the device, the device is started. 1B At the address input of the block k of the memory of node numbers, the sample code of the first memory cell, which contains the numbers of two nodes i and j incident to the first branch, is entered through the element OR-11 from the first output of control block 2. At the same time, this sampling code is fed to the address input of the block 1 of the memory of branch resistances and through the element OR 12 to the address input of the block b of the memory of counterbalancing influences. The control input of the k memory of node numbers from the fifth output of the control block 2 receives a control signal, according to which the memory of the k memory is selected and the information is read from its first memory cell. The binary codes of the node numbers I and j from the output of the block k of the memory of node numbers through the open element AND 13 and the element OR 10 arrive at the address input of the block 8 of the memory of the node pressures. In the memory cells of block 8 of memory of node heads with addresses and j, the values of heads of these nodes are H- and H- (if these nodes are not master, since the first iteration contains zeros). From the output of block 8, the control signal is fed to the first input of the balancing effects calculation unit 3 and to the first input of the comparison unit 16. The second input of the balancing effects calculation unit 3 from the output of the branch resistance memory block 1 receives the resistance value of the first branch from the control signal. On the control signal from the third output of the control unit 2, which is fed to the third input of the unit 3, compute-. balancing influences, in block 3, the values of balancing influences of the first branch IHrHjl gi are calculated, 1 (.-5Чп (And оС,, n | m.-Hi (HrMjO- 14) sizes H and 42 come from the output of block 3 to the first input of the balancing actions memory block 6. 9 and are recorded in the first memory cell of the block 6 by the control signal, stepping from the fifth output of the control unit 2. In a similar way, the balancing influences of the other branches (total V branches) are calculated, they are recorded in the corresponding memories of memory block 6. After calculating the ur The node inputs are calculated for the network branches V, the branch input for the memory block 5, the node input for the memory block 15, and the first input for the switch 1 of the second control unit 2 receives the sampling code the first cell of the memory. At the same time, this code enters the black element OR 10 at the address input of the memory block of node heads.The first cell of the memory of the block 5 of the branch numbers contains branch numbers incident to the first network node. moat branches through an OR gate 12 receives the address input of memory block 6 and the counterbalancing effects through OR gate 11 to the address input of the k memory node numbers. The codes of the node numbers are received by the control signal at the second input of the switchboard of balancing effects (AND element 13 is closed). The balancing switch 1, according to the ratio of the codes to its first and second inputs, is connected to the second input of the block 7 for calculating the nodal heads of one of the two balancing effects or H corresponding to the mth branch of the network. If a branch with a number is enclosed between nodes with numbers i and j and calculates: with the head of node i, then if i i, the value. In addition, the first input of block 7 from the output of block 15 of the node costs by the control signal receives the costs of the nodes. The unit 7 calculates the UWL head according to the control signal from the control unit 2, generates at its output the values of the heads of the nodes in accordance with the expression -1/91 Hg-f, (1 where Pr is the number of branches coinciding with the number I; But - head at node 1; Qg - consumption at node 1.; - sum of balancing actions of all m branches converging at node E (Y is the balancing effect of branch t, which can be included in (5) or as depending on the ratio of the number of the node for which the head is calculated and the number of the second node of the branch t). the node head pressure is fed to the second input of the comparison unit 16, where it is compared with the head of the same node obtained at the previous iteration and fed to the first input of the comparison block 16 from the output of the node 8 of the head pressure memory by the control signal at its second input. Coincidence or the discrepancy between these values is recorded in the comparison block J6, after which the calculated pressure value is recorded through the element OR 9 in the memory block 8. After such a calculation of the head in all nodes, the fulfillment of the condition of the end of the iterative process is checked. At the same time, the third input of the comparison unit 16 from the sixth output of the control unit 2 receives a polling signal of the unit 16. The iteration process ends when the required 11H solution is reached, which is determined by the number of compared bits in the comparison unit 16, where M is the required resolution accuracy, And and n are the vectors of the nodal head at the Kth and (K + 1) th iterations. The balancing effects calculating unit 3 (FIG. 2) forms the function. -S nlHrH / llp, I fn corresponding to the first balancing-. the influence of the nrfi branch and the function ml / .si.n (.). l) I t corresponding to the second balancing effect of the mth branch.

1110

The unit 7 for calculating the nodal heads (Fig. 3) forms the functions (5).

The control unit operates as follows.

The Start signal arriving at the second input of the element I 25, the clock pulses from the generator output 2k clock pulses arrive at the first input of the counter 33 commands. On the first cycle of operation of the device, the state of the counter 39 is measured by the number of branches per unit. Block k compare-. The next state of the counters is 39 branch numbers with the total number of branches P in the simulated pipeline network and, in the event of a coincidence, generates a signal 1 at its output. The zero state of flip-flop 3 indicates that the device has performed a cycle of calculating the balancing effects of the branches of the simulated network. A sample of the block number memory and readout of information from the memory cells are made. In the second cycle of operation, information is sampled and read out from block 8 of the node pressure head. On the third cycle, the branch resistance memory block is sampled. In the fourth cycle, a control signal is generated to calculate the values of the balancing effects. On the fifth cycle, a block 6 of memory balancing the possibilities is sampled.

actions and recording information in the memory from the output of the balancing effects calculation unit 3. In addition, on the fifth clock cycle, the command counter 33 is reset to zero. Further, the operation of the control unit 2 is repeated as described above until the moment when

| in the counter 39 branch numbers coincides with the number of branches P of the simulated network.

Similarly, the cycle of calculating node pressure is completed. After the cycle of calculating node pressure is completed, the comparison of node pressure at this and previous iterations is made in comparison block 16 (Fig. 1), and the result of the comparison determines the need to continue counting.

The switch, at the command of the control unit 2, outputs the value of the counterbalancing effect to the block for calculating the node pressures.

Comparison unit 16 (Fig. 6) performs bitwise comparison of information received at its inputs. The proposed device increases the accuracy of the solution in comparison with the known device due to the automation of the set of topology of the calculated pipeline network and the rejection of the keyed floor.

f (/g./

G7

18

/

ten

IB

L

FIG. I

23

Fig.Z

ffS

CV

SO

FIG. five

Claims (3)

1. A DEVICE FOR CALCULATING MODES OF PIPELINE NETWORKS, containing a memory block of the resistances of the branches, the address input of which is connected to the first output of the control unit, and the output is to the input of the unit of balancing effects, about τη- which, in order to increase the accuracy of calculation, a node number memory block, a branch number memory block, a balancing influence memory block, a nodal head calculation block, a nodal head calculation block, a nodal head memory block, an AND element, four OR elements, a balancing action switch are introduced into it; Lock memory node costs and the comparison unit, the first control unit output is connected to first inputs of first and second OR, the outputs of which are respectively connected to the address inputs of the memory block numbers of nodes and equalized outweighs impacts, the first control unit output is connected to the first input _element: and whose output is connected to the first input of the third OR element, the output of which is connected to the address input of the nodal memory block; pressure, the second output of the control unit is connected to the first control input a balancer of the balancing actions, to the address inputs of the memory blocks of nodal expenses and branch numbers and to the second input of the third OR element, the output of which is connected to the address input of the memory block of nodal heads, the third and fourth outputs of the control unit are connected to the control inputs of the nodal pressure calculation units and balancing effects-: actions, inputs of all memory blocks. combined and connected to the fifth output ₍ control unit output, the output of the branch number memory unit is connected to _(the second input of the second OR element. and the second input of the first OR element, the output of the node number memory block is connected to the second control input of the balancing actions switch and the second input of the And element, the first input of the balancing actions calculation block is connected to the output of the nodal head memory block and to the first input of the comparison block, the output of the calculation block balancing effects connected to the information input of the memory block balancing effects, the output of which is connected to the information input of the switch balancing effects s whose output is coupled to a second input of you, SU ... 1007111 calculus nodal pressures, the first input of which is connected to the output node of the storage unit costs, you are a. the stroke of the nodal head calculation unit is connected to the second input of the fourth OR element, the output of which is connected to the information input of the nodal head memory unit, the output of the nodal head calculation unit is connected to the second input of the comparison unit, the control input of which is connected to the sixth output of the control unit, and the output to the input of the control unit, the first input of the fourth OR element and the information inputs of the memory blocks of node numbers, branch resistances, and node costs are. the inputs of the device, the output of the device is the output of the memory block of nodal heads. 2. The device according to p. ^ Characterized in that the balancing action calculation unit consists of an input register, three adders and a nonlinearity setting unit, the outputs of the input register being connected to the inputs of the first adder, the output of which is connected to the first input of the nonlinearity setting unit, the first inputs of the second and the third adders are combined and connected to the output of the nonlinearity setting unit, the second '' inputs of the second and third adders are connected to the corresponding outputs of the input register, the first, second inputs of the input the histra and the second input of the nonlinearity setting unit are the first, third, and second inputs of the balancing actions calculation unit, and the outputs of the second and third adders combined are the output of the balancing actions calculation unit, 3. The device according to claim 1, which is important in that the nodal head calculation unit consists of an adder and a division unit, the input of which is divisible is connected to the output of the adder, the inputs of the adder and the input of the divider of the division unit are first, second and the third inputs of the nodal head calculation unit, and the output of the division unit is output; home block nodal pressure calculation.