scholarly journals ACOUSTIC EMISSION TESTING OF FIBERGLASS PIPES AND FITTINGS

2021 ◽  
pp. 12-25
Author(s):  
S. V. Elizarov ◽  
D. A. Terentyev ◽  
K. A. Medvedev ◽  
V. I. Ivanov ◽  
A. G. Halimov ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Residual Life ◽  
Early Stage ◽  
Experimental Studies ◽  
Operating Mode ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Dimensional Inspection ◽  
Emission Testing ◽  
Acoustic Emission Testing

Experimental studies was carried out. The purpose was to develop a method to test fiberglass pipelines in operating mode. The acoustic emission method was chosen as the main method of nondestructive testing, and visual and dimensional inspection was chosen as an additional method. Acoustic parameters and acoustic emission properties of fiberglass pipes were determined. It was found that acoustic emission sensors can be installed at distances of up to 9-18 m from each other. A series of loading tests was carried out to refine the methodology. Every loading case was performed until leakage registration. In most cases, leakage occurred near the fillet at pressures of 2.2…3.0 from the working pressure, which indicates a large margin of safety for fiberglass pipes. It is confirmed that the acoustic emission method allows early defect detection. Based on the acoustic emission data, 4 main stages of fiberglass pipes degradation were identified. Visual and dimensional inspection was informative only at stages III – IV. Stage IV in most cases corresponds to the leakage. Even early stage of depressurization was registered as continuous acoustic emission. Signals with amplitudes exceeding 60…80 dB were registered at all loading stages. The location map became informative after filtering events by acoustic emission parameters. A methodology for the testing of fiberglass pipes and fittings in operating mode was developed. It contains, in contrast to the currently valid standards, specific numerical values of various quantities related to both the preparation and carrying out of acoustic emission testing and the classification of the identified sources of acoustic emission according to the degree of danger and allows to evaluate the residual life of fiberglass pipelines. The most informative parameter was the activity of acoustic emission; therefore, it is recommended to carry out loading without holding the pressure. It is planned to carry out additional experiments to clarify the mechanisms of fracture acting at each of the 4 identified stages of degradation.

ACOUSTIC EMISSION TESTING OF POWER TRANSFORMERS INSULATION

2020 ◽  
pp. 40-44
Author(s):  
V. V. Bardakov ◽  
S. V. Elizarov ◽  
V. A. Barat ◽  
V. G. Kharebov ◽  
K. A. Medvedev
Keyword(s):  
Acoustic Emission ◽  
High Sensitivity ◽  
Partial Discharges ◽  
Power Transformers ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Emission Data ◽  
Emission Testing ◽  
Insulation Defect ◽  
Acoustic Emission Testing

Testing results of power transformers insulation for the presence of insulation defects, accompanied by the partial discharges occurrence, by means of the acoustic emission method are presented in this article. In particular, the testing of two power transformers with different lifetime was carried out. One transformer was defect-free and one with a willing insulation defect. Based on the testing results, the features of acoustic emission data for power transformers in the presence of partial discharges are found. High sensitivity of acoustic emission method for acoustic wave registration from partial discharges is shown in the article. A method for filtering of noise hits and extraction of hits from partial discharges is proposed. This method is based on excretion of acoustic emission hits from partial discharges out of total number of hits by means of periodicity of their registration, which is synchronized with power supply frequency on the first step. On the next step based on acoustic emission parameters of hits excretion on the previous step, filtration was carried out. The location of the insulation defect which led to the appearance of partial discharges was determined based on the volume location algorithm, by means of acoustic emission method. The insulation defect was confirmed by verification.

scholarly journals Features of Noise Filtering During Acoustic Emission Testing

2019 ◽  
Vol 9 (1) ◽  
pp. 3977-3980
Keyword(s):  
Acoustic Emission ◽  
Acoustic Noise ◽  
Low Noise ◽  
Non Destructive Testing ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Destructive Testing ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
Non Destructive

This article discusses the problems of the acoustic emission method of non-destructive testing. An approach to filtering noise arising from monitoring of acoustic emission is considered. The filtering of acoustic noise is one of the key problems of the acoustic emission method, since the low noise immunity of the acoustic emission method prevents the expansion of its industrial application. The complexity of the filtering is explained by the fact that the waveform and spectrum of acoustic emission pulses change depending on the distance between the defect, which is the source of acoustic emission waves, and the sensor. In turn, the interference, as a rule, is non-stationary in nature and is determined by the type of technological process of the tested composition. This article discusses various types of noise processes, both stationary and non-stationary. The signal and noise parameters are compared, based on which recommendations are given for constructing algorithms for detecting acoustic emission pulses against a background of noise.

Measuring-Diagnostic System for Monitoring and Evaluating the Operational Reliability of Rotor Blades for Aircraft Gas Turbine Engines by Acoustic Emission Method

2020 ◽  
Vol 897 ◽  
pp. 190-194
Author(s):  
Margarita Urbaha ◽  
Alexander Urbah ◽  
Mukharbiy Banov ◽  
Vladimir Shestakov ◽  
Pavel Pogorodny
Keyword(s):  
Acoustic Emission ◽  
Gas Turbine ◽  
Early Stage ◽  
Diagnostic System ◽  
Operational Reliability ◽  
Rotor Blades ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Acoustic Emission Method ◽  
Emission Method

Diagnostics of the rotor blades of aircraft gas turbine engines at pre-operational stage and later on during repairs is carried out by instrumental methods of non-destructive testing. The requirements for increasing operational reliability and safety of flights require a search for new solutions in assessing the strength of rotor blades at an early stage of damage development. For these purposes, one of the perspective directions is the development of acoustic emission methods. This article represents an experimental setup and a measuring-diagnostic system for assessing the operational reliability of rotor blades by the acoustic emission method. It also discusses the results of testing.

scholarly journals APPLICATION OF ACOUSTIC EMISSION METHOD FOR THE EVALUATION OF THE MICROMECHANICS OF DESTRUCTION OF FIBERGLASS MATERIALS UNDER STATIC LOAD

Aviation ◽  
2020 ◽  
Vol 24 (4) ◽  
pp. 169-176
Author(s):  
Margarita Urbaha ◽  
Konrad Stefański ◽  
Mukharbiy Banov ◽  
Vladimir Shestakov
Keyword(s):  
Acoustic Emission ◽  
Damage Accumulation ◽  
Static Load ◽  
Experimental Studies ◽  
External Environment ◽  
Design Feature ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Proportional Change ◽  
Two Stages

The paper presents the results of experimental studies using the acoustic emission method of samples made of fiberglass, the design feature of which is the presence of both base fibers and weft fibers. The test data are presented in relative units and the concept of staged damage accumulation is used, which allows one to recognize subtle phenomena of the nature of the destruction of fiberglass. Tests of the samples with a transverse arrangement of fibers with respect to the applied load showed that the fracture process both in the strain parameters and in the parameters of the total acoustic emission has two stages of damage accumulation: the stage of proportional change of these parameters from stress and the stage of intensive increment of these parameters. In this case, the parameter of the total acoustic emission shows that this process of destruction begins earlier by 5–6% than the strain parameter shows. The proposed methodology and equipment allows us to identify the nature of fracture and assess the tensile strength of such a “staged” composition, and also to solve the problem of what affected the structural unity violations, which may be due to the presence of a set of cracks formed during manufacturing or under the influence of stresses and the external environment during the process of loading.

STANDARDS FOR THE TECHNICAL STATE TESTING OF REINFORCED CONCRETE STRUCTURES BY MEANS OF ACOUSTIC EMISSION METHOD

2020 ◽  
pp. 32-39
Author(s):  
A. I. Sagaydak ◽  
V. V. Bardakov ◽  
S. V. Elizarov ◽  
V. I. Ivanov
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
Experimental Studies ◽  
Test Method ◽  
Reinforced Concrete Beams ◽  
Damage Degree ◽  
Emission Testing ◽  
Acoustic Emission Testing

The review of 3 standards in the field of concrete and reinforced concrete acoustic emission testing, developed and issued by International Organization for Standardization in 2019 is provided in the article. The first standard describes the process of acoustic emission signals measuring in concrete and reinforced concrete. The second standard describes test method for damage qualification of reinforced concrete beams. This standard allows dividing the damage degree of reinforced concrete beams into 3 groups: minor, intermediate, heavy. The third standard describes method for active cracks classification in concrete. This standard allows dividing growing cracks into 2 types: tensile cracks and other crack types (shear). Experimental studies on the correctness assessment of these standards by reinforced concrete beams three-point bending testing with incremental cyclic load were carried out. In total 5 RC beams of heavy concrete with different concrete strength and reinforcing type were tested. Based on the testing results the correctness of the criteria and methods presented in the standards was confirmed.

Application of the Acoustic Emission Method for Estimating the Residual Life of Elastic Elements at the Stage of Preparing a Product for Operation

2022 ◽  
Vol 1049 ◽  
pp. 289-294
Author(s):  
Evgeny Remshev ◽  
Artem Gusev ◽  
Sergey Voinash ◽  
Irina Vornacheva ◽  
Alexander Scherbakov ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Residual Life ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Non Destructive ◽  
Elastic Elements ◽  
Experimental Substantiation

The article discusses the experimental substantiation of predicting the operational properties of elastic elements by the acoustic emission (AE) method, as well as the use of the non-destructive method of acoustic emission as an element of digital certification of critical mechanical and instrument engineering products.

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