SU1158869A1 - Device for resonance vibroacoustic check of articles - Google Patents

Abstract

A DEVICE FOR A RESONANT VIBROACOUSTIC CONTROL OF PRODUCTS, containing a series-connected phase detector, an integrator, a controlled oscillator, an oscillator, an oscillator and matching receiver, an input to the first and an inverter, the input and output of which are connected to the inputs of the first switch, output which is connected to the first input of the phase detector, serially connected reference voltage generator and the second switch, the output of which is connected to the input of the controlled oscillator, and frequency counter, This is due to the fact that, in order to reduce the monitoring time, it is equipped with a first counter, successively connected by a pulse filter, the input of which is connected to the output of the phase detector, a second counter and a differential comparator, the second input of which is connected to the information output of the first counter, and the output with inputs Reset the first and second counters, are connected in series with a single-oscillator, the input of which is connected to the overflow output of the first counter, the third counter with: and a descriptor, the outputs of which are connected They are connected to the control inputs of the switches, the output of the matching amplifier is connected to the second input of the phase detector, the second output of the controlled oscillator is connected to the information inputs of the first counter and 00 90 C frequency counter, and the controls to the input of the first counter. with

Description

1 The invention relates to a test Telnoy technique and can be used for vibro-acoustic testing of products, for example, elements of aircraft. The closest in technical essence and the achieved result to the invention is a device for resonant vibroacoustic control of products, containing sequentially connected phase detector, integrator, controlled oscillator, oscillator, oscillation receiver and matching amplifier, first switch and inverter, input and the output of which is connected to the inputs of the first switch, the output of which is connected to the first input of the phase detector, is connected in series with the setpoint of support 1X voltages and the second an commutator, the output of which is connected to the input of a controlled oscillator, and the frequency meter G1 3. The disadvantage of the known device lies in the large measurement time, which is due to the need for manual switching 13 (jump to the device to determine the subsequent resonant frequencies of the test object. Purpose of the invention fusion of control time. This goal is achieved by the fact that a device for resonant vibro-acoustic control of a product containing a series-connected phase detector, an integrator, controls oscillator, oscillation exciter, oscillation receiver and matching amplifier, first switch and inverter whose input and VELKHOD are connected to the inputs of the first switch, the output of which is connected to the first input of the phase detector, are connected in series by the setpoint voltage generator and the switch that is connected to the input a controlled oscillator, and often a tomer, is equipped with a first counter, successively connected by a pulse filter, the input of which is connected to the output of the phase detector, a second counter and digital The compiler, the second input of which is connected to the information output of the first counter, and the output - Q inputs Reset nejpBoro and the second counters connected in series by a single-channel, the input connected to the Overflow output of the first counter, the third counter and de-diffractor, the outputs of which are connected to the control the inputs of the switches, the output of the matching amplifier is connected to the second input of the phase detector, the second output of the controlled oscillator is connected to the information inputs of the first counter and frequency meter, and Aulus kschy input of the latter connected to the output of the first overflow COUNT. The drawing shows a block diagram of a device for the resonant vibro-acoustic control of products. The device contains a phase-connected phase detector li integrator 2, a controlled oscillator 3, an oscillator 4., oscillations receiver 5 and a matching amplifier 6, the first switch 7 and the inverter 8, the input and output of which are connected to the inputs of the first switch 7 whose output is connected - with the first input of the phase detector 1, the reference voltage setting unit 9 and the second switch 10, the output of which is connected to the input of the controlled generator 3, and the frequency meter 11, the first counter 12, are connected in series pulse filter 13, the input of which is connected to the output of the phase detector 1, the second counter 14 and the digital comparator 15, the second input of which is connected to the information output of the first counter 12 ,. and the output is with the inputs Reset the first 2 and second 14 counters connected in series by the single i6 torus i6, the input of which is connected to the overflow output of the first counter 12, the third counter 17 and the decoder 18, the outputs of which are connected by the inputs ynpa-BJttums tm inputs 7 and 10, 9 The output of the matching axis is connected to the second input of the phase detector I, the second output of the controlled oscillator 3 is connected to the information inputs of the first counter 12 and the frequency meter H, and the control to the 1C {the last input is connected to the forward i2 counter of the first counter i2. Reference numeral 19 denotes a test article that is acoustically coupled to an exciter 4 and an oscillation receiver 5.

3

In the proposed device, the blocks included in it can be as follows.

The controlled oscillator 3 can be selected from the group of measuring signal generators of a special form, in which the oscillation frequency can be tuned by an external control voltage. Counters 12 and

14 integrated circuits, such as type 561 NEU, digital comparator

15 - chip 561 ISH. As a one-shot 16 can be used chip KM 155 AHP. The switch 10 with the decoder 18 can be implemented on chips of type K 591 KN 1.

The device for resonant vibro, roacoustic control works as follows.

Install the controlled article 19 into the device. The device is tuned, for which the corresponding frequency range of the controlled oscillator 3 is set, in which the monitored resonant frequencies of the test object are overlapped by means of voltage supplied to the generator input. In the setting unit 9, reference voltages are set, which are alternately applied to: the input of the controlled generator 3 provides a signal from the output of the generator with frequencies equal to the values of the resonant frequencies of the defect-free product. When the devices are turned on, the output of the one-shot 16 produces a pulse of a predetermined duration, which: enters the input of the third counter 17 (address counter). The signals from the counter 17 output. Through the decoder 18, the commutator switches 7 and 10 arrive at the control inputs. Switch 7 connects the output of the controlled generator 3 to the first input of the phase detector I. The second switch 10 supplies the control input of the generator 3 to the first the reference voltage from the output of the setting device 9. With the action of the control voltage, the generator 3 generates a signal whose frequency corresponds to the first resonant frequency of the defect-free product. The output signal of the oscillator 3; by the wobbler 4 oscillations is converted into an impact applied to the test object 19. From the device attached to the object 69. four

The oscillator 5 oscillation signal through the matching amplifier 6 is fed to the second input of the phase detector 1.

The signal from the output of the phase detector 1 through the integrator 2 in the form of monotonously from) the amplitude of the signal is fed to the control input of the generator 3. At the same time, the frequency of the generator varies as it approaches

in magnitude to the frequency of resonant oscillations of the product under investigation. The self-tuning process is controlled by a pulse filter 13, at the output of which a sequence of pulses is formed when the duration of the pulses from the phase detector is less than a predetermined value.

Pulse output signals

filter 13 is fed to the input of the second counter 14. The input of the first counter 12 receives signals from the output of the generator 3.

Digital comparator 15 compares the readings of counters 12 and 14 and zeroes them if their readings do not match. With the appearance of signals from the output of the pulse filter, simultaneous filling begins.

counters 12 and 14, their reset is terminated and when the counter 12 at its output overflows is filled, an impulse indicating the completion of the auto-tuning process appears.

A pulse from the output of the counter 12 starts a frequency meter .11 measuring the first: the resonant frequency of the product and the one-shot 16, the pulse duration at the output of which is set

A frequency meter 11 is sufficient for frequency measurement. At the end of the indicated pulse on its trailing edge, BliOBb triggers the third counter 17, the signal from 6 outputs which is available through the decoder 10 to the switch 10, causing it to switch. From the sensor 9 voltage supports to the input of the generator 3, the pressure is applied, ensuring

tuning the generator to the vtoru) the resonant frequency of the defect-free; products. NrocesavtopodKoy; Repeated, which leads to measurement and indication on the frequency counter t i

second resonant controlled product, etc.

Thus, the invention provides for the sequential automatic measurement of all the resonant frequencies of the product, which reduces the monitoring time. About defectiveness of the product su 1158869 d t on the deviation of the measured resonant frequencies from the resonant frequencies of the defect-free product.

Claims (1)

¢ 5.4) DEVICE FOR RESONANT VIBROACOUSTIC PRODUCT CONTROL, · containing a series-connected phase detector, an integrator, a controlled oscillator, an exciter, an oscillation receiver and a matching spruce, the first switch, and an inverter whose input and output are connected to the inputs of the first switch the output of which is connected to the first input of the phase ⁴ detector ⁴ , series-connected reference voltage regulator and a second switch, the output of which is connected to the input of the controlled generator, and a frequency meter, exc The reason is that, in order to reduce the monitoring time, it is equipped with a first counter connected in series with a pulse filter, the input of which is connected to the output of the phase detector, a second counter and a digital®4 comparator, the second input of which is connected to the information output of the first counter, and output - with the “Reset” inputs of the first and second counters connected in series with a single vibrator, the input of which is connected to the overflow output of the first counter, the third counter and a decoder, the outputs of which are connected to the control -governing switch inputs, the output of the matching amplifier coupled to a second input of the phase detector, the output of the second controlled oscillator connected to the data inputs of the first counter and the frequency counter and the control input of the latter connected to the output of the first counter overflows.