SU963000A1 - Device for computing generalized realization - Google Patents

Description

The invention relates to computer technology and can be used for statistical processing and calculation of distribution moments, in particular for statistical synthesis of random vibration realizations when testing the vibration reliability of machines and devices.

A device for generating output signals proportional to the average value of the input ^] is known.

These devices are complex structures using algebraic combinators or multi-contact relay coils ^

The closest to the proposed technical essence is a device for determining the average value for the set of implementations, which consists of an analog-to-digital converter with an input switch, an average value calculator, a control unit, and an output storage device with a converter, and the sources of realization of ⁴ random processes through the switch and analog-to-digital converter connected to vakitse into droplets ⁵ mu mean value calculator, connected through an output memory output transducer.

₁₀ In this device, by a signal from the control unit, the analog-to-digital converter is connected in series to subsequent sources (from 1 to N) of implementations and ₁₅ input of analog numbers a _о (t), ..., а ^ (t) and the average calculator arithmetic values.

The arithmetic mean calculator sums up 20 numbers entering it and divides the resulting amount by a number. N sources of implementations. The indicated operation is performed for a number of moments of time £ 2].

However, the known device does not form a generalized implementation, which is the sum of the arithmetic mean value (mathematical expectation) over the ensemble j and the standard deviation taking into account the sign at individual times.

The formation of a generalized implementation is necessary for reproducing 1 'on the electrodynamic vibration stands of operational random vibrations.

It should be noted that the formation of the average value for the set of 1 implementations does not reflect the nature of the changes in each implementation of the set.

The indicated change can be taken into account by the formation of the average deviation from the average value, in other words by the formation of the standard deviation and taking this deviation into account when forming the average value. 2

The purpose of the invention is to increase the accuracy of the formation of a generalized implementation of the ensemble.

The goal is achieved ₃

-Themes that the device for calculating the generalized implementation, comprising the memory unit, whose output is cos union of an information input of the recording unit, the source implementation ,, which outputs are connected to corresponding bit governmental ³ switch inputs, the output of which is connected to the data input of the analog-to-digital a converter, the output of which is connected to the information input of the first average value calculator, the output of the control unit is connected to the control inputs of the switch, an analog-to-digital converter, the first subtract average divisor values Nia ^4, the recording unit and the storage unit, and enter the second average value calculator, square, adders, averaging filters, product sign determination unit, the key function generator ⁵ whose output is connected to information. the key input and the first input of the first adder directly, and through the first averaging filter, with the ⁵ second input of the first adder, the output of which is connected to the first information input of the unit for determining the product sign, the second information input of which is connected to the output of the second adder, and the output of the determination unit the sign of the product is connected to the control input of the key, the output of which is connected to the first input of the third adder, the output of which is connected to the information input of the digital-to-analog converter, whose path through the second averaging filter is connected to the {information input of the memory unit, 'the first input of the second adder is connected to the output of the third averaging filter, the second input of the third adder is combined with the second input of the second adder, the inputs of the third averaging filter and the first quad and connected to the output of the first calculator average value, the output of the first quadrator is connected to the first input of the fourth adder, the output of which is connected to the information input of the functional converter, the output is analog the o-digital converter through the second quadrator is connected to the information input of the second average value calculator, the output of which is connected to the second input of the fourth adder, the control inputs of the digital-to-analog pre converter, the product sign-determining unit, the functional converter and the second average value calculator are combined and connected to the output control unit.

The drawing shows a block diagram of the proposed device.

The device contains sources 1 ^, 1 ^, ... 1 ^, and implementations, the switch

2, analog to digital converter

3, quadrants 4 and 5, calculators 6 and 7 of the average value, functional converter 8, averaging filters 9-11, unit 12 for determining the sign of the product, adders 13 “16 (reversible) key 17, digital-to-analog converter 18, memory block 19, registration unit 20, a control unit.

The output of the functional Converter 8 is formed by a signal value equal to the standard deviation of the process.

At one input of block 12, the signal is equal to) ^ (6., -) - ^ (^), Η) where in (t -)

1

On the other is equal!

instantaneous average value of the process for time t-; the smoothed (time-averaged) value of the process, the input of block 12 is the signal yb --- asch) -a (ъ where G (tq)

G (t.) Ί

At the output, the sign signal is the instantaneous value of the rms * deviation of the process at> ment c; the average value of the standard deviation of the process, block 12 is formed umo15 u _A --si £ n Yk | 11) ί Cb-ii) - <7 Щ)] 1, (6) where sign is the sign operator.

At the output of the key 17, which is reversible, the order is formed *) AG (t;)], (4) where (tl-hlnCt

AGttp-Oi-tl-G'Ot.i),

The outputs of the implementation sources 1 are connected through a switch 2 to the input of an analog-to-digital converter 3.

The output of the analog-to-digital converter 3 is connected directly to the input of the average value calculator 6, and to the input of the average value calculator 7 through the quadrator 4. The output of the average value calculator 7 is connected to one input of the first adder 13, the output of which is connected to the other input through the square 5 calculator 6 average value.

963000 6 to the other input of which the output of the adder 15 is connected, to one input of which the output of the calculator 6 of the average value is connected directly, and to the other input through the averaging filter 10.

The output of block 12 is connected to the control input of the key 17, to the information input of which the output _{λ of the} functional converter 8 is connected.

The output of the key 17 is connected to one input of the adder 16, to the other input of which the output of the calculator 6 of the average value is connected. The output of the adder 16 through a series-connected digital-to-analog Converter 18 and the averaging filter 11 is connected to the input of the block. 19 of the memory, the output of which is connected to the input 20 of the registration unit 20, which is essentially an information presentation unit.

The output of the control unit 21 is connected to the control inputs of the switch 2, analog-to-digital converter 3, 'calculators 6 and 7 of the average value, block 12, digital-to-analog converter 18, block 19 and block 20.

The device operates as follows.

Before starting work, the control unit 21 issues a reset signal, which sets the circuit to its initial state. In this case, the input of the analog-to-digital converter 3 is connected ι through the switch 2 to the first source 1 of implementations. An analog-to-digital converter 3 converts the analog value of the first implementation at the time of the survey to the number a ^ (q).

By the signal from the control unit 21, the number a ^ it ^) is copied to the calculator 6 of the average value and after squaring Ga ^ (t _d ) j is copied to the calculator 7 ·

Then, according to the signal from block 21, switch 2 connects the digital converter 3 to the source 1 ^. implementations, forms in calculators 6 and 7 the numbers a ^ (t ^) ^and ^^, respectively.

Thus, the analog-to-digital converter 3 is connected in series to the following sources .1 ^> 14, · .., 1 and implementations and input of analog numbers a ^ (t ₄ ), ..., βγ (tj),. . . a ^ (t ^) and their squares in calculators 6 and 7, respectively.

the second one

The output of the adder 13 is connected to the input of the functional Converter '8, the output of which is connected to one input of the adder 14 directly, and to the other input through an averaging filter 9 · The output of the adder 14 is connected to a single input of block 12, to

I

Ί

Calculators 6 and 7 summarize the incoming numbers and divide the sum by the number η (η is the number of sources of implementations).

At the output of calculator 6 of the average value, the average value of the ensemble of implementations for is formed. of the polling moment t ^ ·, and at the output of the calculator 7, the average value of the square of т _г (t ₄ ) (the second initial moment) is formed by the ensemble of realizations for the polling moment t ₄ .

According to the signal from the control unit 21, the functional converter 8 generates at the output a signal value representing the mean square deviation: deviation according to the ensemble of realizations for the moment of polling t ₄ .

The signal of the control unit 2.1 at the output of the block 12 generates a signal defined by the relation (3), i.e. taking into account the sign of the product of the deviation of the arithmetic mean from its smoothed value and the deviation of the rms value from its smoothed value.

The output signal of block 12 is supplied to the control input of key 17, the output of which is formed by a signal equal to the signal at the output of functional converter 8, and its sign is determined by the signal at the control input of key 17 (coincides in sign with the sign of the signal at the output of block 12 )

Thus, at the output of the adder 16, a signal is formed where pl () is the average value for time t ₄ over the set of realizations;

bChts) ~ the mean square deviation for the moment Ts over the set of realizations,. The obtained value C) for the moment of polling is overwritten by a signal from the control unit 21 to the memory unit 19. After time T _ol (the frequency of the survey of sources of implementations) analog-to-digital Converter 3 is again connected to the first source 1 ₄ . In the future, the device works similarly.

In block 19, a series of q) values are accumulated for time t ₄ ,. .., tq.,. ,, t ^.

As these values are determined (or after the completion of the survey of the sources of implementations), the data is output to block 20 (for example, a recorder with a digital-to-5 analog converter), on which an updated time function n \ y (T) of the arithmetic mean value over the ensemble of implementations is formed,

The proposed device allows to increase the accuracy of the formation of a generalized ensemble implementation when reproducing operational cases of 15 tea vibrations on electrodynamic vibration stands, which means it will increase the reliability of information about vibration resistance, vibration resistance and vibration reliability of machines and assemblies during vibration testing.

Claims (2)

1. US patent number 3371200, class. 235-193, published. 1975. 2. USSR author's certificate number 268036, cl. G About G 7/52, 19b2.