RU2713563C1 - Information-diagnostic system for monitoring of technical state of pipelines - Google Patents

Abstract

FIELD: measurement technology.

SUBSTANCE: use: to monitor pipeline technical state. Summary of invention consists in the fact that information-diagnostic system for control of technical state of pipelines includes a base made massive and vibration-resistant, excitation device consisting of series-connected: an acoustic radiator mounted on the support, a digital-to-analogue converter and a personal computer, as well as a recording device consisting of two sensitive elements, which can be made in form of piezoelectric sensor, microphone or laser vibrometer, installed with possibility of controlling distance between them and possibility of their movement along longitudinal axis of analyzed pipeline, wherein system of supports with retainers, on which analyzed pipeline is arranged, is introduced.

EFFECT: improving control accuracy of technical condition of pipelines due to taking into account pressure effect on pipeline.

1 cl, 4 dwg, 1 tbl

Description

The invention relates to the field of non-destructive testing methods, namely to control the technical condition of pipelines by their resonant frequency.

Closest to the claimed invention is an installation for studying the effectiveness of determining the location of pipelines RU No. 145137, IPC G01V 1/00, 02.24.2014, which contains a massive and vibration-resistant base on which the studied pipeline is located, a recording system consisting of two sensitive elements installed with the possibility of adjusting the distance between them using the mechanism of movement of sensitive elements at equal distances from the longitudinal axis of the studied pipeline, and sensitive elements are connected through an analog-to-digital converter to a personal computer, as well as an excitation system consisting of a series-connected acoustic emitter installed on the base, a digital-to-analog converter and a personal computer, while an acoustic emitter is installed on the base with a test pipe placed with the possibility of turning in the horizontal plane by hinging its end to the base.

The disadvantage of the prototype is the low accuracy of the control of the technical condition of pipelines, since it does not take into account the effect of pressure created by the soil, taking into account factors such as the density of the soil and its thickness.

The task of the invention is to develop an information-diagnostic complex for monitoring the technical condition of pipelines, which eliminated the disadvantages of the prototype.

The technical result is to increase the accuracy of monitoring the technical condition of pipelines.

The technical result is achieved by the fact that in the information-diagnostic complex for monitoring the technical condition of pipelines, containing an excitation device, consisting of series-connected: an acoustic emitter installed opposite the pipeline under study, a digital-to-analog converter and a personal computer, also has a recording device, consisting of two sensitive elements installed with the ability to control the distance between them and the ability to move the senses -negative elements along the longitudinal axis of the test conduit according to the present invention, there are supports with locks, which are situated on the analyzed line, which enables the simulation of physical effects of pressure generated by the ground, taking into account factors such as soil density and its thickness.

Physical modeling is based on a mechanical similarity consisting in the study of dimensionless quantities such as Poisson's ratio, Young's modulus, etc. Physical modeling consists in applying a variable mechanical effect of the clamps. The study of the influence of the pressure created by the soil is carried out in laboratory conditions.

Moreover, the base of the structure is massive and vibration-resistant, and piezoelectric sensors, laser vibrometers, microphones can be used as sensitive elements.

The design of the installation allows you to locate the sensor for measuring vibration at any point in the studied pipeline. This is especially true for the use of proximity sensors (microphone or laser vibrometer).

The invention is illustrated by drawings, where in FIG. 1 shows the proposed information-diagnostic complex for monitoring the technical condition of pipelines, FIG. 2 support with a lock, in FIG. 3 a support with an acoustic emitter, in FIG. 4 base with legs. In the drawings, the numbers indicate:

1 - guide;

2 - support with a clamp;

3 - support with an acoustic emitter;

4 - a clamp;

5 - support with a clamp;

6 - leg;

7 - height adjuster;

8 - test pipe;

9 - base with legs;

10 - regulator of the degree of mechanical impact;

11 - a clamp bolt;

12 - clamp bolt of a clamp;

13 - a nut of fastening of a leg;

14 - acoustic emitter;

15 - a sensitive element (conventionally, one is shown in the drawing);

16 - analog-to-digital Converter (ADC);

17 - digital-to-analog converter (DAC);

18 - personal computer (PC).

The information-diagnostic complex for monitoring the technical condition of pipelines contains: guides 1, on which supports with clamps 2 are fixed, clamps with clamp bolts 11 and clamping bolts 12 clamp the studied section of the pipeline 8, clamps 4 are equipped with regulators of the degree of mechanical impact 10 that simulate statistical mechanical the impact of soil on the control object, and are also equipped with height regulators 7, allowing to simulate bending stresses in a vertical plane.

Acoustic emitter 14 is fixed on the support 3 opposite the pipeline to create a resonant frequency and support with a lock 5. The whole structure is supported by a base 9, which is equipped with legs 6, which allow adjusting the angle of the pipe, and also to prevent contact with the floor covering, which in turn increases accuracy of the final result. To fix the legs 6, nuts for fastening the legs 13 are used, they also allow you to adjust the height of the installation. The individual parts of the installation are bolted together.

The design of the fastening elements allows for research with pipelines made of various materials and various diameters.

The registration device consists of two sensing elements 15 with the possibility of their movement along the guide 1, ADC 16 and PC 18. The excitation device consists of an acoustic emitter 14, DAC 17 and PC 18.

The principle of operation of the information-diagnostic complex for monitoring the technical condition of pipelines is as follows.

Sensitive elements 15 are recorded resonant vibrations that are excited in the pipe 8 by an acoustic emitter 14, installed opposite the studied pipeline.

In this case, the studied pipeline 8 is installed on supports with clamps 2, with the help of which a certain soil pressure will be created (table 1).

Table 1. The calculated values of the pressure of various types of soil from the depth (Gaponenko SO. Acoustic-resonance information-measuring complex and methods for controlling the location of buried pipelines: dissertation of the candidate of technical sciences. Kazan State Power Engineering University, Kazan, 2017).

Using a personal computer 18, a signal is transmitted through the DAC 17 to an acoustic emitter 14, which excites resonant vibrations in the studied pipeline 8. Sensitive elements 15 (one is conventionally shown in the drawing) mounted on supports with clamps 2, vibrations of the walls of the pipeline are recorded at three points. The signal from the sensitive elements through the ADC 16 is fed to a personal computer for further analysis.

Changing the static mechanical impact (load) allows you to simulate the effects of various types of soil at different depths of the control object. The degree of mechanical impact (pressure) of the soil on the studied pipeline is regulated using a scale on the handle of the regulator of the degree of mechanical impact 10, due to the force applied by it (turning the handle).

Claims (1)

An information-diagnostic complex for monitoring the technical condition of pipelines, containing a base made massive and vibration-resistant, an excitation device consisting of serially connected: an acoustic emitter mounted on a support, a digital-to-analog converter and a personal computer, as well as a recording device, consisting of two sensitive elements that can be made in the form of a piezoelectric sensor, microphone or laser vibrometer installed with possibly the ability to control the distance between them and the possibility of their movement along the longitudinal axis of the studied pipeline, characterized in that a support system with clamps on which the studied pipeline is placed is introduced.

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