SU991447A1 - Device for setting boundaries - Google Patents

Description

The invention relates to hybrid computing and can be used in specialized gi & Readable computing devices in solving boundary problems of mathematical physics. A hybrid computing device is known, containing an R-grid, code-controlled current sources and computing units. For boundary conditions, this device uses code-controlled current sources 1. The disadvantage of this device is its low speed. The closest in technical terms to the invention is a device containing R.-; eTKy, two interface blocks, an insertion unit, a switch, a converter, code-controlled voltage sources, and code-controlled resistors. The initial conditions as well as the correction of the parameters of the grid model in the process of solving perform code-controlled voltage sources and code-controlled conductances 2. The disadvantage of the known device 5 is that when setting the boundary conditions of the second and third kind, the performance of the device as a whole decreases due to the deterioration of the convergence of the iterative computational process, which is explained by the incomplete adequacy of the processes occurring in the simulated object and also by increasing the time calculation of the adjustable parameter implemented by the code-controlled grid element. The purpose of the invention is to increase the speed of solving the problem. The goal is achieved by adding an adder, an operational amplifier and three registers, whose input groups are first, second and second, respectively, to the device containing the code-controlled source. By the third groups of inputs for specifying discrete equivalents of voltage and conductivity of the device, the group of outputs of the first register is connected to the group of inputs of a code-controlled source of voltage, the output of which is connected to info The input inputs of the first, second, and third keys, the output of the third key are connected to the first 1 input of the adder, the output of which is connected to the information input of the fourth key, the output of which is connected to the output of the first key and connected to the information input of the co-controlled resistor, the output of which is the output of the device and connected with the output of the second key and with the information input of the fifth key, the output of which is connected to the input of one rational amplifier, the output of which is connected to the second input of the adder, the first and second outputs The second register is connected respectively to the control inputs of the first and second keys, the third output of the second register is connected to the control inputs of the third, quadruple, and fifth keys, the group of outputs of the third register is connected to the group of control inputs of the coding-controlled resistor.

The drawing schematically shows the proposed device.

The device contains a register 1, a code-controlled voltage source 2, keys 3-7, an adder 8, an operational amplifier 9, a register 10, a code-controlled resistor, Neither register 12, input groups 13-15 of the device.

The device works as follows.

When electrical modeling

the boundary problems all the diversity in the specification of the initial, boundary conditions and the right-hand sides of equations of type (T) (l) reduces to a definite combination of the parameters U, R, E, -. (and 5 ° to Pb1b are at the node point of the grid model.

The information on the first 1 and second 1O register changes in the process of solving the problem according to the algorithm for solving it. The operation mode of the code-controlled resistor is set at the stage of preparing the grid model for the solution. Registers 1 and 10 are the buffer memory of the code-controlled voltage source 2 and resistor 11, which is needed to organize simultaneous occupancy of information in all blocks 2 and 11

hybrid ustruystva when solving a problem, i.e. to parallelize the computational process. The adder 8 is built on an operational amplifier using a non-inverting input, and operational amplifier 9 is a repeater with a high input impedance.

To simulate the third kind of boundary conditions, register 12 sends a signal to the closing of keys 3, 4 and 7 (An example of solving the problem of heat conduction is considered).

On. groups of inputs 13 and 14 of registers 1 and 10 receive information (in the form of discrete equivalents of voltage and conductivity), which is then fed to the inputs of code-controlled voltage sources 2, and resistor 11, where it is converted to analog values. The potential obtained at the output of the code-controlled voltage source 2, proportional to the difference (©) I, through the switch 3 is fed to the first input of the adder 8. To this, through the switch 7 and the operational amplifier 9, the potential generated at the output of the device is applied. As a result, the output signal adder 8 is proportional to the value of TJ, -T (9) f-® code-controlled resistor, the conductivity of which should be proportional to the coefficient cL, a voltage drop is proportional to the difference) 3 ". Thus, at the output of the device, at the nodal point is formed

boundary condition OtCTj ,, - TO) - where

0, is the heat transfer coefficient, Tr is the medium temperature, T (в) is the nodal point temperature located on the surface of the object being simulated, is the heat flux.

The modeling of the boundary conditions of the second kind is carried out similarly. The difference is that in the process of solving the value of the code-controlled conductivity does not change.

. When modeling the boundary conditions of the first kind, from the register 12 a control signal is applied only to switch on the key 5 and to the output of the device, i.e. A stream from the output of the code-controlled source voltage is fed to the boundary node.

To simulate the right side of equation (1), the register 12 receives signals only to turn on the key 6. Then the set potentials from the output of the code

Claims (1)

Claim A device for setting boundary conditions, containing a code-controlled voltage source, five keys and a code-controlled resistor, characterized in that, in order to increase the speed and speed, an adder, an operational amplifier and three registers are introduced into it, the input groups of which are respectively the first, second and the third group of inputs for setting discrete equivalents of voltage and conductivity of the device, the group of outputs of the first register is connected to the group of inputs of a code-controlled voltage source, the output of which is connected with the information inputs of the first, second and third keys, the output of the third key is connected to the first input of the adder, the output of which is connected to the information input of the fourth key, the output of which is connected to the output of the first key and connected to the information input of the code-controlled resistor, the output of which is the output of the device and is connected to the output of the second key and to the information input of the fifth key, the output of which is connected to the input of the operational amplifier, the output of which is connected to the second input of the adder, the first and the second outputs of the second register are connected respectively to the control inputs of the first and second keys, the third output of the second register is connected to the control inputs of the third, fourth and fifth keys, the group of outputs of the third register is connected to the group of control inputs of the code-controlled resonator.