SU1624454A1 - Apparatus for continuous diagnosis of linear dynamic systems - Google Patents

Abstract

The invention relates to instrumentation engineering and can be used for continuous diagnostics during operation of devices that are described by a system of linear differential or difference equations. The aim of the invention is to increase the reliability of diagnosis. For this purpose, a device containing a test generator, two adders, a subtraction unit, a reference reaction generator, and a comparison unit were inserted a correlator, analog-to-digital converter, two registers, a clock generator, a SYNCHRONIZATION block, and a block of indices (AI. 9 or .

Description

The invention relates to instrumentation engineering and can be used for continuous diagnostics during operation of devices that are described by a system of linear differential or difference equations.

The purpose of the invention is to increase the reliability of continuous diagnosis of linear dynamic systems in the operating mode,

Figure 1 shows the block diagram of the device; Fig. 2 shows an example of the implementation of the comparison block; fig.Z - generator of reference reactions; 4 shows a correlator; figure 5 - block synchronization; figure 6 is a temporary diagram of the operation of the device; 7 - clock generator; in Fig.8 is a generator of test effects; Fig. 9 is a subtraction unit.

The device (figure 1) contains the first adder 1. a generator of 2 clock pulses, a generator of 3 test actions, a subtraction unit 4, a second adder 5, a correlator 6, an analog-to-digital converter (ADC) 7, the first and second registers 8 and 9, the comparison unit 10, the generator 11 reference reactions, the synchronization unit 12, the display unit 13, the diagnosed system 14, consisting of the main and backup linear dynamic systems 15 and 16 (the main and backup control objects) and has information input 17 and information output 18. Moreover, the first and second information the ion inputs of the adder 1 are connected respectively to the input of the device 17 and the output of the generator jpa 3, and the output of the adder 1 is connected to the first input of the diagnosed system 14 (the input of the object 15). The first information inputs of the subtraction unit 4 and the adder 5 are connected to the first output of the diagnosed system 14 (object output 15), and the second information inputs of the unit 4 and the adder 5

Yo

  1 second exit diagnosis. .- 1- 14 (output of the object 16). 1 chr,} og i 4 subtraction is information 18 by the device 18, output r, fc; O (this test stimulus J is connected to the second input of the diagnosed sys tem, 14 (input 16 of the object) and input 62 of the correlator 6, input 6-, which is connected to the hike of the adder 5, and the output is connected to I1 | formzts1 | 0nnm converter input 7 Information ROXES of registers 8 and 9. The ut domains go mainly with information outputs of the converter 7 and 11 reference reactions , and informational inputs of registers 8 and 9 are connected with Persians of r / (10i) and second (South) information (Zuo The first inverse output of the block 10 is connected to the input of the block 13, and the second pr - output is connected to the input (11i) of the number, “generator 11, the output of the sign of the beginning of which is connected to the input of the block 12 Perihy firioKa 12 input connected to the input srrM (i 12) of the initial installation of the generator 11, and the third output of the block 12 is connected to the input (Uz) of the initial installation of the block 10., generator Output of the generator 2 clocks; The soybean is connected to the clock input of the ge / sgatsee about the test actions by the input of the inverter 7, the sync switch (1 3J i 1 reference reactions, the first and second register inch I, i. i P, and - the clock input (10) of block 10 Equal to 5 / uk 10 comparisons (Fig. 2) contain a digital gomperator 19, triggers 20 and / i - о рнт22 PLI, HF element 23 and holding line 2L .11 reference clock generator ii, i fcb 1г.1Л | contains the element 25 AND, the counter - and the fixed permanent memory and.

Correlle torus ci) line

 } 8 282 B | H hazerzhki, multipliers

2 Sch, 2, 29z, .., 29km, integrators 30i, 302, -10g ..., 30k + i and .zgor31.

The synchronization unit 12 (FIG. 5) contains a decoder 32 and a running multivibragor 33. The generator 2 clocks (php 7) contains 34-36 from the emulsion 34-36 And, rezi t.TOpDi 37 and 38, capacitors 39-41 and kv-TsGUYY resonator 42, Test Effect Generator 3 (FIG. 8) contains registers 43-14, cyf M TOpn 45-47 modulo two, -m Lem-nt 43 ls resistors 49-51.

Llo: with 4 subtractions (FIG. 9) contains an operational amplifier 52, resistors 53-58 and a ksh-donsator 59

VcTponcTBO works as follows.

In the process of processing information, the speci fi cation signal J of its “stroke 17 and test

The signal Tc of the output of generator 3, added in adder 1, is fed to the input of the main linear dynamic system 15, where they are processed in accordance with the function of this system L. At the same time, the test signal t from the output of the generator 3 arrives at the input of the additional linear dynamic system 16. the signals of the main and additional linear dynamic systems Cx + 1) and Lt are respectively subtracted in block 4. As a result, at the output 18, the response of the main linear dynamic system Lx to the signal x at the input 17 is formed.

It is known that if the autocorrelation function of the test signal behaves as a d function, then the mutual correlation function of the input and output signals is the impulse response of the linear system. Let the test signal t, the main signal at the input 17 - x. Since the signals x and t are independent, their mutual correlation function Rx, t (r) 0.

Taking into account that the mutual correlation function of the signals at the input and output of the linear system is a convolution of the auto-correlation function of the input signal and its impulse response for the diagnosable system:

R2u. (R) -Rt.t (r) xh (T), (1)

where R2Lt, t (7) is the mutual correlation function of the test signal at the inputs and the sum of reactions to the test signal at the outputs

diagnosed system

Rt, t (T) is the autocorrelation function of the test signal1

h (t) - impulse characteristics of the system being diagnosed.

Considering that a test signal is given, for which the autocorrelation function Rt, t (r) 6 (t), from expression (1) it follows that

R2iu (r) h (r) (2)

The input 6i of the correlator 6 from the output of the adder 5 receives a signal 2Lt + Lx, the input 62 receives a test signal t from the output of the generator 3. The correlator measures the mutual correlation function between the signals 2Lt and t, which according to expression (1) that the autocorrelation function of the signal t is close to the 5-function and is the impulse response of the system being diagnosed. 14. Generation

5 test signal with specified characteristics is carried out using a shift register with feedback, which allows to obtain a periodic good-through sequence

(PSP), in which the autocorrelation function is close to the g-function. The signal from the output of the correlator 6 in analog form is fed to the input of the converter 7, where it is digitized and then fed to the input of the register 8 in the parallel code. From the first output of the generator 11, the signal of the reference impulse characteristic of the diagnosed system in the form of a digital parallel code is fed to the input of the register 9. Through the clock pulses coming from the output of the generator 2 to the input of the increment of the converter 7, the input 11 of the generator 11 and the synchronous inputs of registers 8 and 9 and block 10 comparison, a synchronous comparison of samples of the reference and actual impulse characteristics is performed in the comparison unit 10 (the information inputs to its information inputs, respectively, ISTRY 8 and 9). The result of the comparison is displayed by block 13. After the end of the comparison of the pulse characteristics, the block 12 sets the generator 11 and the block 10 to the initial state and then the comparison process is repeated. If the measured pulse characteristic does not match, the red LED lights up in block 13 (display unit 13 is made on a D-flip-flop, the green and red LEDs are connected to the direct and inverse outputs, respectively).

Initial state.

In the initial state, the clock pulses from the output of the generator 2 are fed to the input of the generator 3 test actions, which produces a test signal in the form of SRP. The test and main signals, added in adder 1, are input to the main linear dynamic system 15 and are processed in accordance with its function. At the same time, the test signal from the generator 3 output arrives at the input of the additional linear dynamic system 16, the output signals of the main and additional linear dynamic systems 15 and 16 are subtracted in block 4. As a result, the output of the 18 produces the response of the main linear dynamic system 15 to the main signal. From the output of the correlator 6, a signal equal to internal noise is fed to the input of the converter 7 and then in the digital code through the register 8 goes to the first information input (10i) of block 10, to the second information input (102) of which from the generator 11 through the register 9 enters the digital code of the first reference of the reference impulse response stored in memory 27 of the generator 11

Device operation in dynamic mode.

The first readout of the measured impulse response of the diagnosed system 5 14, converted into a digital code by the converter 7 and, accordingly, the first readout of the reference impulse response stored in memory 27 at the zero address, through registers 8 and 9 arrive at

0 the first and second inputs of the comparator 19 (figure 2).

When the codes are equal, a high voltage level appears at the output of the comparator 19, which, after a hold time in the delay line 24, determined by the end of the comparison transients, enters the input of the trigger 20, the output of which is high. on which the trigger 21 is set to one state and unblocks the passage of clock pulses through element 25 to the counting input of counter 26. The next memory address is selected with the next clock pulse with 5 power of counter 26 and 27 (fig.Z) on which a reference count is stored corresponding impulse response. This reading is compared in block 10 of the comparison with the corresponding reading of the measured impulse response from the output of the converter 7. At the output of element 22 there is a high voltage level, and at the output of element 23 it is low

Voltage level 5, block 13 is in the same zero state if the corresponding readings are equal. Upon completion of the comparison of the impulse characteristics, the unit 12, in accordance with the code of the last address, sets the reference unit 10 to the initial state and the generator 11 of the reference reactions. If the compared samples are not equal, then a low voltage level appears at the output of the comparator 19 (Fig. 2), which passes through the trigger 20 to the first input of the element 22, to the second input of which a low level is fed from the inverse output of the trigger-21 wives As a result, the output of element 22 is low.

0, the voltage level at the output of the element 23 is a high voltage level, which sets the trigger of the block 13 to one and the red LED lights up. The comparison process is repeated with a period determined by the period of the SRP (pseudo-random sequence).

Claims (1)

Apparatus of the Invention A device for continuous diagnostics of linear dynamic signals, comprising a generator of test actions, two adders, a subtraction unit, a reference test response and a comparator unit, the first information input of the first adder being the test set input of the device, the second information input of the total adder is connected to the generator output test actions, the output of the first sum is the output of the device for connecting to the input of the main control object, the first information the inputs of the subtraction unit and the second adder are combined and are the input of the device for connection to the output of the main control object, and the second information inputs of the subtraction unit and the second adder are also combined and form the input of the device for connection to the output of the backup control object, characterized in that to increase the reliability of diagnostics, it contains a correlator, an analog-to-digital converter, two registers, a clock generator, a synchronization unit, and a display unit whose input is connected n to the inverted output of the comparison unit, the output of the test actions generator is the output of the device for connecting the reserve control object to the input, the output of the subtraction unit is the information output of the device, the first and second information inputs and the output of the correlator are connected respectively to the output of the second adder, generator output test effects and information input of the analog-digital converter, the output of the clock generator is connected to the clock input of the test actions generator, the increment of the analog-digital converter and the synchronous inputs of the reference reaction generator, the first and second registers and the comparison unit, the first and second information inputs and the direct output of which are connected respectively to the outputs of the first and second registers and the input number of the test generator of the reference reactions, information inputs first and second registers connected to the information output of the analog-digital converter and the information output of the generator of reference reactions, and the input and first and second outputs of the synchronization unit are connected respectively to the output of the sign of the start of the test of the generator of reference reactions, the input of the initial installation of the same generator and the input of the initial installation of the comparison unit . ". I Mf frSffrzgi Pu & .4 Fi & .5 Ql.1 Out 6A.15 ) BuxlB, LOO You BA.ifi bit) t1 START DIAGNOSTIC / SHIA R FIG. 7 Ito QKDHHAHHE D1 GN11ST1 OVAN1I Yl From 6A.2 | L | 6 + Un Niggle 1Ji, l) lIl-K155nP13 ЩШ4.1П15-КЭЭ1ЛП5П Mb -К531ЛШ Jx5 an 4Јf K SA 1,6,6 - I P four JA - K 5744D1A |