scholarly journals Increase of informativity of two-frequency method of defectometry at ultrasonic control of details and units of railway rolling stock

2018 ◽  
Vol 77 (3) ◽  
pp. 182-187 ◽  
Author(s):  
A. N. Kireev
Keyword(s):  
Experimental Studies ◽  
Rolling Stock ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Frequency Method ◽  
Ultrasonic Control ◽  
Software Product ◽  
Non Destructive ◽  
Rolled Wheel ◽  
Railway Rolling Stock

When forecasting the technical state of the parts and units of railway rolling stock in operation, an important task is to determine the shape of the discontinuity in ultrasonic non-destructive testing in order to predict its behavior in further operation (this is especially important if the discontinuity in the results of such control is acceptable). Author proposed a solution for the improvement of the two-frequency defectometry method. A mathematical apparatus was developed and a method for determining the coefficient of the discontinuity shape was elaborate on its basis. The method makes it possible to determine the shape of both a point and an extended discontinuity. The software product NDTRT-07.03.01.18 was developed to automate calculations in determining the shape of discontinuity by a two-frequency method. The article gives a description of the experimental studies carried out to evaluate the reliability of the proposed method. This method can be used in determining the shape of the discontinuity in the details of the rolling stock, in which the defect can have a different shape, for example: cast wheel centers; various shaped castings used in the manufacture of rolling stock units (brackets for locomotive bogies, cast sidewalls for cars), as well as in parts manufactured by the method of plastic deformation, including wheel treads, axles, all-rolled wheels, rolled wheel centers, etc. In these details discontinuities are predominantly planar in nature, but voluminous discontinuities are also encountered - non-deformable nonmetallic inclusions, therefore the developed method can be applied to such objects of rolling stock railways.

Photometric Method of Diagnosis of Bearing Units Operating with Hydrocarbon Mixtures

2018 ◽  
Vol 284 ◽  
pp. 1342-1348
Author(s):  
E.N. Gryadunova ◽  
R.N. Polyakov ◽  
N.V. Tokmakov
Keyword(s):  
Experimental Studies ◽  
Physicochemical Process ◽  
Bright Spot ◽  
Photometric Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Internal Damage ◽  
Hydrocarbon Mixtures ◽  
Bearing Unit ◽  
Non Destructive

The article is devoted to the diagnosis of bearing units working with hydrocarbon mixtures. The diagnostic is based on the photometric method. This method allows you to determine the internal damage to the bearing unit at the stage of the appearance of the microcrack. The photometric method is based on changing the color of the indicator fabric. As the indicator substance, a bromine solution was used which had a dark brown color. If there is a leak, the hydrocarbon reacts with bromine molecules and a bright spot appears on the tape. Indicator fabric is applied to the bearing unit during assembling.The material of the article contains a model of the physicochemical process, which is the basis of the photometric method. Various stages of leakage of hydrocarbon mixtures through microcracks were studied. The results of the experimental studies are consistent with the theoretical propositions. The proposed diagnostic method can be used as a method for non-destructive testing of bearing units.

Application of the Roof Leakage Infrared Detection Technology

2013 ◽  
Vol 401-403 ◽  
pp. 978-981
Author(s):  
Xiao Wen Zeng ◽  
Yong Mei Zhang
Keyword(s):  
Thermal Imaging ◽  
Experimental Studies ◽  
Test Method ◽  
Thermal Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Infrared Thermal Imaging ◽  
Scope Test ◽  
Detection Technology ◽  
Non Destructive

The infrared thermal imagery technology receives more and more attention in the civil engineering because of its unique advantages. But there is still room for more in-depth theoretical and experimental studies in the aspect of its applicable scope, test method, the result and the precision analysis and so on. Through the research of the infrared thermogram of water-containing and insulation-free roof specimen and glass fiber insulation roofing specimen, this paper mainly analyzes the factors which influence detection of the roof leakage by using infrared thermal method and gives some suggestion for the application of infrared thermal imaging in the roof leak detection. Thus it provides the theory basis and the technical reference for the actual infrared non-destructive testing.

scholarly journals Ways to increase the production efficiency of hardwood blanks

2021 ◽  
Vol 280 ◽  
pp. 07010
Author(s):  
Serhiі Mazurchuk ◽  
Nataliya Marchenko ◽  
Yuriy Tsapko ◽  
Olga Bondarenko ◽  
Nataliya Buyskikh ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Production Efficiency ◽  
Experimental Studies ◽  
Control Methods ◽  
Conceptual Scheme ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Testing Method ◽  
Main Factors ◽  
Non Destructive

The article presents the main results of experimental studies on the identification of the main grade defects of oak lumber by the thermal non-destructive testing method. Regressional dependences of wood defects temperature display from the main factors for the studied grade defects are proposed. Indicators of infrared radiation (temperature range) of the main visible oak grade defects obtained as a result of experimental studies are presented. A conceptual scheme for the line control methods of identification of the main grade defects in lumber are proposed.

Исследование выявляемости поверхностных плоскостных дефектов ультразвуковым методом с применением волн Рэлея

2021 ◽  
Vol 6 ◽  
pp. 26-34
Author(s):  
Н.П. Алешин ◽  
Н.В. Крысько ◽  
С.В. Скрынников ◽  
А.Г. Кусый
Keyword(s):  
Experimental Studies ◽  
Signal Amplitude ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Electromagnetic Acoustic Transducer ◽  
Destructive Testing ◽  
Testing Method ◽  
Acoustic Transducer ◽  
Non Destructive ◽  
Planar Flaw

The issues of detecting operational surface planar flaws by the ultrasonic non-destructive testing method with the use of Rayleigh surface waves generated by an electromagnetic-acoustic transducer are considered. The paper presents experimental studies of planar defects detection, simulated by an artificial reflector of the "notch" type with different width, depth and angle of inclination. The dependences of the signal amplitude on the listed parameters are constructed and their character was estimated. The optimal amplitude models for constructing the probability of detection curves (PoD) have been determined. A conclusion is made about the minimum dimensions of an operational planar flaw detected by the considering method with a probability of 90%, taking into account the confidence interval of 95%.

scholarly journals ANALYSIS OF METHODS AND MEANS OF DETERMINATION OF THE FACTORY OF OIL PIPELINES AND THE CALCULATION OF THEIR RESIDUAL RESOURCES

2021 ◽  
pp. 134-141
Author(s):  
R. T. Martyniuk ◽  
O. T. Chernova ◽  
M. R. Shyan
Keyword(s):  
Oil And Gas ◽  
Experimental Studies ◽  
Statistical Processing ◽  
Design Parameters ◽  
Experiment Planning ◽  
Actual State ◽  
Technical Diagnostics ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

The basic principle of diagnosing long-life metal structures, and pipe­lines in particular, is based on consistent and systematic measurements of certain design parameters, on detecting changes in these parameters during operation and comparing them with the original ones, and on predicting changes in these parameters. The application of technical diagnostics and non-destructive testing methods to determine the actual technical status is a regular technological operation and, as experience shows, an effective way of ensuring the tech­nical reliability and safe operation of pipelines and the gas transmission system as a whole. The methods of non-destructive testing, correlation analysis and mod­ern methods of statistical processing of experimental and reference data (artificial neural networks) were used to determine the actual state of oil and gas pipelines. Factor and regression analysis methods were used during theoretical studies. In the course of the experimental studies, the methods of experiment planning, probability theory were used.

Experimental Research of Flaw Detection Technique at Manual Ultrasonic Testing of Railway Rolling Stock Elements

NDT World ◽  
2015 ◽  
Vol 18 (4) ◽  
pp. 72-75 ◽  
Author(s):  
Киреев ◽  
Andrey Kireev
Keyword(s):  
Form Factor ◽  
Ultrasonic Testing ◽  
Experimental Studies ◽  
Flaw Detection ◽  
Rolling Stock ◽  
Dual Frequency ◽  
Frequency Method ◽  
Limit Values ◽  
Defect Type ◽  
Railway Rolling Stock

Introduction. The work aim was to carry out experimental studies of dual-frequency method reliability for defect type determination at manual ultrasonic testing of railway rolling stock elements. Method. The method of discontinuity type determination includes: measuring amplitude characteristics of echo signals from the detected defect on the frequency of 2.5 and 5.0 MHz; calculation a defect form-factor; comparing the form-factor with the certain limit values, one of which corresponds to a planar defect and the other corresponds to a volume defect. The defect is considered planar/volume, if its form-factor differs from the appropriate limit value by no more than 30%. The method gives an opportunity to determine types for both point and extensive defects. For the experiment a sample was manufactured, in which various artificial reflectors of different types and dimensions were made. The type of each reflector was determined with dual-frequency method. The relative error and reliability of type determination were calculated. Results. Experimental studies have shown that reliability of defect type determination with dual-frequency method is quite high. The average accuracy of point defect determination has been 97,389%; extensive defect determination has been 93,588%.

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