SU1285491A1 - Device for reproducing time functions - Google Patents

Abstract

The invention relates to the field of analog computing and is intended to reproduce the functions of time at long intervals. The aim of the invention is to increase accuracy. The goal is achieved due to the fact that, in addition to the periodic function generation unit 1, the first 2 analog storage unit, synchronization unit 4, the second 3 analog storage unit, integration unit 6 and output adder 7 are inserted to the sampling pulse generator 5 allows us to proceed to the replacement of a piecewise constant approximation, to a piecewise linear approximation of the functions of time. 2 Il. (L

Description

1

eleven

The invention relates to automation and computing technology and is intended to reproduce the required time functions at long intervals, in particular in software drivers of automatic controllers.

The purpose of the invention is to increase accuracy.

FIG. 1 is a functional block diagram of the device for reproducing the function of time; in fig. 2 - timing charts of the device. ,

(t - j; - -) on the approximation interval of the NSI

of The pulse disappears once at the beginning of the next integration cycle (interval T) simultaneously with the pulse CB1 and ensures that the output signal uU (t) of the integration unit 6, which is defined by the expression

one

& U (t) -l- J f (t.) -F (t.) It T. and o 1 + 1 I

. f (t ,,) - f (t,) „, O),

J- S

The device for reproducing the time functions (Fig. T) contains a block 1 forming periodic functions, the first 2 and second 3 analog memory blocks, the synchronization block 4, the sampling pulse generator 5, the integration block 6, the output adder 7.

The device for reproducing the functions of time works as follows.

The periodic function generation unit 1 reproduces the required

the function f (-T-) in the accelerated in d- (times the time scale, periodically repeating from the NSI signals from the first output of the synchronization unit. Shaper 5 sampling pulses from the SI clock signals (from the second output of the synchronization unit 4), the frequency of which the number of approximation intervals of the required function, generates pulses of the sample CB1 and CB2, which ensure the recording of the next value of the function

f () respectively in the first 2 and

the second 3 analog storage blocks, and the pulses NO to zero the integration block 6. Since the interval between the pulses CB1 and CB2 is chosen equal to one period of sync pulses 5 where,, 1,2 ..., T is constant on the integration.

Thus, the output voltage of the integration block 6 is a sawtooth curve, the slope of which in the iM integration cycle is determined by the difference f (tp-f (tj), and the output of the output adder 7 f, (t) is piecewise linear approximation of tre20

thirty

of the function f (t): f5 (t) f ,, (t + i:) f (t.) -f dU (r), 0 t T.

(2)

As follows from the expression (1). when choosing a constant integration Tj equal to the approximation interval T, the output signal of block 6 integrating 35 NIN at the end of the integrating cycle (at T) is equal to

li (t)

TW) .if (tL)

40

 f (t ,,,) - f (t.).

(3)

and at the output of the output adder 7, the signal is

45 f .. (t; 4-T) f (t;) + uU (T) f (t.,),

Those. the next value of the required function, which is recorded in the first analog storage unit of the SI (Tj, |), then in the first analog 50 2 simultaneously with the reset in the storage unit 2, the output signal of the block 6 is stored and the desired function f (tp at the current ( i) step, and in the second key 3, the value of f () is stored, corresponding to the next (1 + 1) -th step of 55. To reduce the requirements and the accuracy of storage of these values in anathegation, which ensures an exact conjugation of the values of f (t ) at the ends of the interval T.

Claims (2)

Invention Formula log memos in blocks 2 and 3 they can be overwritten that time where, 1, 2 ..., T - constant integration. Thus, the output voltage of the integration block 6 is a sawtooth curve, the slope of which in the iM integration cycle is determined by the difference f (tp-f (tj), and the output of the output adder 7 f, (t) is piecewise linear approximation of the three of the function f (t): f5 (t) f ,, (t + i:) f (t.) -f dU (r), 0 t T. (2) As follows from the expression (1). when choosing a constant integration Tj,; equal to the approximation interval T, the output signal of block 6 of the integrated 35 NIN at the end of the integration cycle (at T) is equal to li (t) TW) .if (tL) 40  f (t ,,,) - f (t.). (3) and at the output of the output adder 7, the signal is 45 f .. (t; 4-T) f (t;) + uU (T) f (t.,), Those. to the next value of the required function, which is written to the first analog storage unit 2 at the same time as dropping the output signal of the block 6 into zero integration, which provides an exact conjugation of the f (t) values at the ends of the interval T. Invention Formula A device for reproducing the functions of time containing a block generating a periodic function connected by the output to the information input of the first analog storage unit connected by a control input to the first output of the sampling pulse generator; a synchronization unit whose first and second outputs are connected respectively to the trigger input of the generating unit of the periodic function and the clock input of the sampling pulse generator, characterized in that, in order to improve accuracy, an output adder is inserted into it, a second analog storage unit and an integrated unit Coupled straight and inverting inputs informational E respectively to the outputs of the second and first analog memory blocks, the output of the adder output is the output device and the first and second inputs connected to the output sootyetst- venno first analog memory unit and the output of integrating unit connected to the input zeroing with the first output of the sampling pulse generator, the second output of which is connected to the control input of the second analog storage unit connected by an information input ion input to the output of the generation unit of the periodic function.