SU1516819A1 - Vibrotesting system - Google Patents

Abstract

This invention relates to vibration testing equipment. The purpose of the invention is to improve the measurement accuracy by eliminating the errors of the software survey of analog-digital converters. A high-frequency crystal oscillator 1 generates reference oscillations for the generator 2 of the infra-low-frequency oscillations and the generator of 10 polling intervals. On the shaker table 4, a vibrometer 5 and a test object 8 are installed, the output signals of which are converted into code by analog-digital converters 6 and 9, respectively, and transmitted to processing unit 7 for processing. The shaper 10 polling intervals produces pulses that trigger analog-to-digital converters with a frequency that is a multiple of the moving system of the shaker. 2 Il.

Description

The invention relates to vibration testing equipment and can be used to test seismometric equipment in the frequency range from 0.01 to 20 Hz.

The purpose of the invention is to improve the measurement accuracy by reducing the errors of the software forming the polling intervals for analog-to-digital converters.

Figure 1 shows the block diagram of the vibration test system; FIG. 2 is a block diagram of a survey interval generator.

The vibration testing system consists of a series-connected high-frequency crystal oscillator 1, a generator of 2 low-frequency oscillations, an amplifier 3, a vibrostand, a vibrometer 5, a first analog-to-digital converter (ADC) 6, a computing unit 7, made in the form of a computer, the test subject is installed on the i-table i an object 8, the output of which is connected to the first input of the second (ADC) 9. The output of the second ADC 9 is connected to the second input of the computing unit 7. The second output of the vibrometer 5 is connected to the second input of the amplifier 3. The output of the quartz oscillator 1 is also connected to the first input of the 10 interrogation intervals, which is the first input of the And 11 element. The information inputs of the buffer register 12 and the decryption circuit 13 of addresses and commands are combined and are the information inputs of the imaging unit 10 polling intervals to which the information outputs of the computing unit 7 are connected. The output of the generator 10 polling intervals, which is the output of the circuit AND the selection of the state of the subtractive counter 15, is connected to the second inputs of the first and second ADC 6 and 9. The input of the buffer register 12, the input of the element OR 1b and the input of the trigger 17 are combined and connected to the first output circuit 13 decoding addresses and commands. The second output of the decryption circuit 13 and co, and an is connected to the second input of the trigger 17, the output of which is connected to the second input of the And 11 element. The output of the And 11 element is connected to the first input of the subtractive

1 release of O. The state of output of which is connected to the house of the element OR 1b. You r OR 1b is connected to the second counter of the 15. counter 15.

Vibration testing with em as follows.

Installed on the gene 50, the framing frequency oscillations are introduced into the computer by a computer (the controller thermostat into the computer peripherals. Using the entered value, the value

15

20

25

thirty

35

40

45

50

st

P

l OP

   t ;;. p

where N is the number of tact of total quartz to form a survey;

f „„ is the frequency of the reference Hz;

Frequency fluctuates the amount of change in the period of infrani oscillations.

The signal from the frequency generator is amplified by an amplification that causes the vibrostand 4, it is forced to undergo testing. The vibrometer 5 measures ur and controls the output of the body 3 to keep the vibration level. The ADC 6 prplnya from the output of the vibrometer gives it to a computer for anal converts the output object in the code and into a computer for analysis.

Calculated value in a computer that forms an exchange with a polling driver. Diagram 13 of the cipher and the polling driver commands determines the naznah transmitted information of the command selection record counter 15 trigger to zero state prevents the passage of the impulse counting pulse and writes the pulses of the hyster of the device cop information into the buffer p

counter 15, the installation inputs of which is subtractive counter 15.

connected to the information outputs of the buffer register 12. The output of the counter 15 is connected to the input of the circuit

one

16819-

1 selection of the state of the counter, the output of which is connected to the second input of the element OR 1b. The output of the element g OR 1b is connected to the second input of the subtraction of the 10. counter 15.

Vibration testing system works as follows.

The frequency value set on the generator 2 of the low frequency oscillations is inputted into the computer by the operator (the control console unit included in the peripheral devices of the computer. The value

15

20

25

thirty

35

40

45

50

st

P

l OP

   t ;;. p

where N is the number of cycles of the high-frequency quartz oscillator to form the polling intervals;

f „„ is the frequency of the reference oscillator, Hz;

oscillation frequency of the stand, Hz; the number of measurements on one period of infra-low-frequency oscillations.

The signal from the infra-low frequency generator 2 is amplified by amplifier 3 and excites the vibrostand 4, onto which test object 8 is mounted. Vibrometer 5 measures the vibration level and controls the output signal of amplifier 3 in order to maintain a given vibration level. The ADC 6 converts the signal from the output of the vibrometer into a code and transmits it to a computer for analysis. A / D converter 9 converts the output signal of the test object into a code and transmits it to a computer for analysis.

The calculated value of N is transmitted to a computer, which forms a standard exchange with the shaper of 10 polling intervals. The decryption scheme 13 of the addresses and commands of the poller of the 10 polling intervals determines the destination and address of the transmitted information. In the event that the write command is allocated to the subtracting counter 15, the trigger 17 is set to the zero state, which prohibits the passage of pulses to the counting clock of the subtracting counter 15 and writes the pulses on the buses of the interface of the computer interface to the buffer register 12 and

When a command to start up a generator of 10 polling intervals appears on the mainline of a computer, the command is allocated

and sets trigger 17 to the state of logical one. At the same time, counting pulses are passed through the element 11 to the counting input of the detracting counter 15. Each pulse reduces the misloader recorded in the counter 15 by one and when the deducting counter 15 reaches the O state, the O selection circuit 1 generates the O subtractive counter 15 Generates a pulse to the second input of the logic element OR 1b, while the contents of the buffer register 12 are rewritten into the subtractive counter 15. As a result, the subtractive counter 15 is reset and will be set to zero again.

soybean rocket; one with the amplifier input; the output of the second analog-to-digital converter is connected to the second input of the unit; the calculation is; the input of the second analog-to-digital converter is designed to communicate with the object, characterized in that

In order to improve measurement accuracy, it is equipped with a high-frequency quartz oscillator and a polling inverter driver, consisting of a buffer register, address and command decryption circuit, subtractive counter, zero state separation circuit, trigger, element OR, and element And, the first input of And, first input

state after the passage of the N pulse - 2 o bodies of the polling intervals, combined with the co-input of the generator of infra-low

Thus, the vibrations are provided and are connected to the output of pulsing the pulses with the required period. The output pulses from the allocation circuit 14 of the O subtractive counter 15 are fed to the inputs. Starting the first and second ADC 6 and 9. The computer polls the readiness of the ADC 6 and 9. When a readiness bit is received

The frequency quartz rei-eparopa information inputs of the buffer register 25 and the decryption of command addresses are combined and are informational inputs that form and 1 polling intervals, the first input is three hera, the first input of the 1GII element and

A / D converters 6 and 9, the computer inputs the buffer register, are combined and

the formations from the first and second ADCs 6 and 9 are operational memory. After entering n values, the computer processes the records by decomposing it into a series. The results of the calculations determine the amplitudes of the harmonic components in the output signals of the vibrometer and the test object, which allows determining the conversion factor and phase shift. Conducting a measurement for several values of frequencies allows obtaining the amplitude and phase characteristics of the instrument under study - a geophone.

Claims (1)

Invention Formula Vibration testing system containing sequentially connected generator of infra-low-frequency oscillations, amplifier, vibrostand, vibrometer, first analog-digital conversion to the first output of the circuits. Address and command decryption, the era of which is connected to the second input of the trigger, the trigger output is connected to BTO The f-ring input of the AND element, the output of which is connected to the first input of the subtracting counter, the setup inputs of which are connected to the information outputs of the buffer register, the output The Q of the detracting counter is connected to the input of the zero-state selection circuit of the counter, the output of which is connected to the second input of the OR element and is the output of the polling integral generator that is connected to the first inputs of the first and second analog-digital converters, the output of the OR element The input of the subtracting counter is connected to the second one; the information inputs of the survey ingerator are connected to the information: the output terminals of the computing unit. 50 frequency quartz rei-eparopa, information inputs of the buffer register 25 and the decoded address and command circuits are the information inputs that form and 1 polling intervals, the first trigger input, the first input of the 1GII element and the input From the buffer register are combined and pineny with the first output of circuits. - decoding of addresses and commands, the era of which you are connected to the second input of the trigger, the output of the trigger is connected to the BTO of the input of the element I, the output of which is connected to the first input of the detracting counter, the installation inputs of which are connected to the information outputs buffer register output The Q of the detracting counter is connected to the input of the zero-state selection circuit of the counter, the output of which is connected to the second input of the OR element and is the output of the polling interval generator, which is connected to the second inputs of the first and second analog-digital converters, the output of the OR element is connected to the second input subtractive counter, information from the shaper inputs into the survey are connected to the information: the yn outputs of the computing unit. 0 Phie.g