SU1195361A1 - Device for changing scales in analog computers - Google Patents

Abstract

DEVICE FOR CHANGES. SCALES IN ANALOG COMPUTING MACHINES, containing an operational amplifier, the output of which is the device output and connected to the inputs of the initial conditioner, the outputs of the amplifier and the upper and lower limits of the integrated range, the outputs of which are connected to the control inputs of the unit initial conditions, and an integrating capacitor connected between the input and output of the operational amplifier, characterized in that, in order to simplify the device Without decreasing accuracy, n digital-controlled resistances, n shift registers, n initial code setting blocks, sets of upper, and lower limits of the integration range and 2n OR elements are entered into it, and digital-controlled resistances are connected between the corresponding input of the device for changing scales on the input of the operating the amplifier, the control inputs of each digitally-controlled impedance are connected to the bit outputs of the Corresponding shift register connected by setting inputs with corresponding Each unit of the shift register is connected to the output of the corresponding element OR, the first inputs of which are connected respectively to the lower and upper bounds sensors from the sl range, and the second inputs are connected to the outputs of the upper fixation block with Cj and boundaries of the range of integration.

Description

one

The invention relates to a computing technique and can be applied in analog computing machines (AVMs) for solving systems of linear homogeneous and inhomogeneous D1 attenuatorial equations.

The purpose of the invention is to simplify the device without reducing accuracy.

The drawing shows a diagram of a device for resizing in AVMs,

The device contains an operational amplifier 1 with an integrating capacitor 2 in the feedback circuit, fixing blocks for the lower 3 and upper 4 limits of the integration range, digital-controlled resistances 5 connected to the input of operational amplifier 1, a shift register 6 connected to the control inputs of the digital-controlled resistance 5, the elements are OR 7, the first inputs of which are connected to the outputs of the fixing blocks of the lower 3 and upper 4 limits of the integration range, and the second inputs are connected to the setting devices 8 of the upper and lower limits of the range, b Lok 9 of the initial code and the initial conditions setting unit 10 Operational amplifier 1 with a capacitor 2 in the feedback circuit forms an integrator. The initial condition setting unit 10 contains the first capacitor 11, one output of which is connected via a current-limiting resistor 12 to the output of operational amplifier I and through the normally closed contacts of the first relay 13 is connected to the second output of the same capacitor. The second output of the first capacitor II is connected through the normally open contact of the first relay 13 to the input of the operational amplifier I. One output of the second capacitor 14 through the normally closed contacts of the second relay 15 is connected to the code of the inverter 16, the input connected to the output of the operational amplifier 1., and normally open contact with the input of the operational amplifier, another output of the second capacitor 14 through the limiting discharge current, the resistor 17 is connected to the zero potential bus, the winding 18 of the second relay is connected to the output m block fixing the lower limit 3, and the winding 19 of the first relay - with the output of the block

953612

fixing the upper limit 4. A comparison device is used as the fixing unit for the lower bound 3 and the fixing unit for the upper bound 4

5 (comparator) of two voltages, one of which is the value of the range limit, the other is the value of the variable. Block 9 of the initial code is implemented as a keyboard

10 registers. Initial register code

Shift 6 can also be brought from a digital computer through an appropriate switch. As setting devices 8 lower and upper boundaries

15 of the integration range, the corresponding codes of the fixation blocks of the lower 3 and upper 4 boundaries of the range of the same devices are used to scale in analog

20 computing machines.

The device works as follows.

Let it be necessary to solve a system of linear differential equations.

. "..X f and ,. X „", .. X; + ... "

in

12 2.

one

Iv 1

2 S 22 2-- “2; i-- l. P

0)

X o (. X + I, X V .. + & .. X. + ... a. X; 1111 12 2 1 in п

, the initial state of the coefficients are set

to the digitally controlled resistances 5 through registers 6 with the help of blocks 9 of the initial code. After the start of integration and upon reaching the variable X; voltage of the lower limit of the range unit 10 setting the initial conditions increases the voltage on the capacitor 2 twice, and the unit 3 fixing the lower boundary through the elements of IL 7 produces a pulse J which shifts codes on shift registers 6 connected to the digital-controlled resistance 5, to the left, integrator inputs. In this case, the coefficient

 The cycles (L., I.2, - .., are doubled. At the same time, the impulse Uf goes through the corresponding elements ILi 7 to the right-shift buses of the shift registers 6,

5 connected to the digital-controlled resistances 5, the inputs of which are connected according to the equation to be solved with the output of the integrator. This will cause a decrease in the coefficients of the resulting new system of two equations. "IlV-2 ° l -lnn 2" 2i -. "N2 - 2a,,, - - .. 2a; .X ..... 2", X,, + 2.l ...... l .... a. „N-“ ni n2 2 - l “ni - n4 is equivalent to the system (1), -a scale of the variable x-, doubled when you reach By varying the range limit, unit 10 of setting the initial conditions of the integrator reduces the voltage on the capacitor of the integrator by two times, and the block of fixing the upper limit of the range 4 through the elements OR 7 generates a pulse that shifts codes on registers 6 connected to the digitally controlled resistances 5, which are the inputs of the integrator. At the same time, the coefficient a is halved. Simultaneously, 614 with this impulse and 1 through the corresponding elements OR 7 is fed to the left shift busbars of the shift registers 6 connected to the digitally controlled resistances 5, the inputs of which are connected according to the equation with the corresponding input, which causes an increase in the coefficients - 1 ni twice. As a result, the system of equations (I) is converted to the form% "i -" t2V - 2 ",, x ....... V “2ZV- 2“ ji; - "rp, - M / r ° iiNI" i2 2 - l HV-4% n .x ..... The system of equations (3) is also equivalent to system (1), and the scale of the variable Xj is reduced by half. When a variable transitions to other subranges, the scaling process is repeated.

Claims (1)

DEVICE FOR CHANGE. SCALES IN ANALOGUE COMPUTING MACHINES, containing an operational amplifier, the output of which is the output of the device and connected to the inputs of the initial setting unit, outputs connected to the input of the operational amplifier, and blocks for fixing the upper and lower boundaries of the integration range, the outputs of which are connected to the controlling inputs of the initial installation unit conditions, and an integrating capacitor connected between the input and output of the operational amplifier, characterized in that, in order to simplify the device without lower accuracy, it introduced η digitally controlled resistances, η shift registers, η job blocks' of the initial code, upper and lower integer ranges and 2η OR sensors, and digitally controlled resistances are connected between the corresponding input of the device for zooming and the input of the operational amplifier, the control inputs of each digitally-controlled resistance are connected to the discharge outputs of the corresponding shift register connected by the installation inputs with the outputs of the corresponding When the initial code is set, the left and right shift inputs of each shift register are connected to the output of the corresponding OR element, the first inputs of which are connected to the lower and upper limits of the range, respectively, and the second inputs are connected to the outputs of the fixation blocks of the upper and lower boundaries of the integration range. SU, „, 1195361> 1 1195361