SU1640569A1 - Device for construction and object state control - Google Patents

Abstract

The invention relates to a measuring and control technology and can be used for the inspection of industrial equipment operating under vibration conditions. The purpose of the invention is to expand the functionality by detecting local defects. An ultrasonic echo-location flaw detection circuit and a weighted comparison circuit are introduced into the device containing a vibration measurement circuit with a vibration sensor. As the transducer of the ultrasonic flaw detection circuit, the vibration sensor of the vibration measurement circuit was used. 1 hp ff, 1 ill.

Description

The invention relates to a measuring and control technology and can be used for the inspection of industrial equipment operating under vibration conditions.

The purpose of the invention is to expand the functionality of the device by detecting local defects.

The drawing shows a diagram of one of the possible options for building a device.

The device contains a circuit of I vibration measurements, including a vibration sensor 1, a preamplifier 2 connected in series, a low pass filter 3, an amplifier 4, a detector 5 and the first indicator 6, and a ultrasonic echo-location flaw detection II (ultrasonic flaw detection) circuit, which includes serially connected elements 7 isolators, a bandpass filter 8, a limiting amplifier 9 and an adder 10, a pulse generator 11 connected in series, a frequency divider 12 and a pulse shaper 13, the output of which is connected to the second input of the isolating element 7, subsequently connected trigger 14, circuit 15, counter 16, read-only memory (ROM) 17, digital-to-analog converter (DAC) 18, adder 10, integrator 19 and second indicator 20, and attenuation compensation element 21 and delay element 22 The second input of the integrator 19 is connected with the output of the frequency divider 12, the input of the attenuation compensation element 21 and the second inputs of the trigger 14 and the counter 16, the second output of which through the delay element 22 is connected to the first input of the trigger 14. The output of the pulse generator 11 is connected second entrance and the ROM 17 and the AND 15 circuit. The code of the attenuation element 21 is connected to the second input of the amplifier limiter 9. The device also contains a weighted comparison circuit III, which includes a potentiometer 23, the first 24 and the second 25 comparators and the source 26 of the reference levels, the corresponding inputs of which are connected the first inputs of the comparators 24 and 25, the second inputs of which are connected to the moving contact of the potentiometer 23, the fixed contacts of which are connected respectively to the outputs of the detector 5 and the integrator 19 (the outputs of circuits I and II). The output of the vibration sensor 1 is connected to the first input of the eleo.

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There are 7 outputs, the output of which is connected to the input of the preamplifier 2. The output signals of the amplifier 4, the amplifier limiter 9 and the adder 10 are received for additional processing. The output of the first comparator 24 serves to generate an alarm, and the output of the second comparator 25 to generate a command for emergency shutdown of the object (outside the device).

The device works as follows.

Circuit I vibro-measurements using the vibration sensor 1 determines the level of vibrations and feeds it to one of the inputs of the weighted comparison circuit III. Scheme II Ultrasonic flaw detection periodically excites the vibration sensor 1, which emits ultrasonic pulses into a design, perceives and converts echo signals, which in the ultrasonic defectoscopy scheme are compared with the original pre-stored signals characteristic of the defect-free design. In this case, circuit II generates a signal proportional to the changes in the echo signal and is associated with the evolved local defects of the structure, and supplies it to the second input of circuit III of the weighted comparison. The weighted comparison circuit III summarizes the signals from the I vibration measurement circuit and the ultrasonic flaw detection circuit II, giving greater or lesser importance to this or that signal. This is established in advance, depending on the characteristics of the object or structure. So, for example, if the equipment is more important for equipment vibration resistance, and minor structural defects are acceptable, then vibration measurement takes priority. If even minor structural defects (for example, a helicopter screw crack) are dangerous, then ultrasonic flaw detection results in greater weight. According to the results of the weighted summation, the lit scheme generates, by comparing the sum with the specified limits, a command to alarm or emergency shutdown of the object. A particular use of the invention may be to control the operation of the vibration sensor 1 itself by comparing its own response to the probe pulse with its original data. In this case, the integrity and sensitivity of the sensor, the state of its contact with the structure under study, the strength of attachment, etc. can be assessed.

The device provides signal outputs for additional processing (outside

devices):

vibration signals to the detector — for spectral, correlation, probabilistic, and other analyzes;

amplified echo signal - for a detailed analysis of the response of the structure to an ultrasonic probe pulse under vibration conditions;

results of the comparison of the echo signal with the initial data before integration - for operational assessment of the changes taking place with localization of the places of defects, determination of their size and character, etc.

Claims (2)

1. A device for monitoring the state of structures and objects containing a circuit vibration measurements with a vibration sensor, characterized in that, in order to extend the functionality by detecting local defects, it is equipped with an ultrasonic location-based defectoscopy scheme (ultrasonic flaw detection) and a weighted comparison scheme, the inputs of which are connected respectively to the outputs of the vibration measurement schemes and ultrasonic flaw detection, and in The vibration sensor of the vibration measurement circuit was used as a converter of the ultrasonic flaw detection scheme. 2. The device according to claim 1, characterized in that the weighted comparison scheme made in the form of a potentiometer, the first and second comparators and the source of the reference levels, the corresponding outputs of which are connected to the first inputs of the first and second comparators, the second the inputs of which are connected to the movable contact of the potentiometer, and the fixed contacts of the latter are the inputs of this circuit. rfc ABOUT Uh Nido full service G- {Alarm But Manda on shutdown On dopopn ovrvtku 20 I 79 To complement the oyriotka 22 iiJZl -, II -, -. ir-1I