Non-destructive Diagnostic Methods for Smart Road Infrastructure Evaluation

2020 ◽  
pp. 237-246
Author(s):  
Lenka Mičechová ◽  
Anna Krišková ◽  
Jozef Jandačka ◽  
Ján Mikolaj ◽  
Michal Veselovský
Keyword(s):  
Diagnostic Methods ◽  
Road Infrastructure ◽  
Non Destructive

scholarly journals Bearing defect diagnosis and acoustic emission

2003 ◽  
Vol 217 (4) ◽  
pp. 257-272 ◽  
Author(s):  
A Morhain ◽  
D Mba
Keyword(s):  
Acoustic Emission ◽  
Threshold Level ◽  
Diagnostic Methods ◽  
Non Destructive Testing ◽  
Test Rig ◽  
Destructive Testing ◽  
High Background ◽  
Bearing Defect ◽  
Non Destructive ◽  
Ae Counts

Acoustic emission (AE) was originally developed for non-destructive testing of static structures, but over the years its application has been extended to health monitoring of rotating machines and bearings. It offers the advantage of earlier defect detection in comparison with vibration analysis. However, limitations in the successful application of the AE technique for monitoring bearings have been partly due to the difficulty in processing, interpreting and classifying the acquired data. The investigation reported in this paper was centred on the application of standard AE characteristic parameters on a radially loaded bearing. An experimental test rig was modified such that defects could be seeded onto the inner and outer races of a test bearing. As the test rig was adapted for this purpose, it offered high background acoustic emission noise providing a realistic test for fault diagnosis. In addition to a review of current diagnostic methods for applying AE to bearing diagnosis, the results of this investigation validated the use of r. m. s., amplitude, energy and AE counts for diagnosis. Furthermore, this study determined the most appropriate threshold level for AE count diagnosis, the first known attempt.

scholarly journals Influence of the surface finishing on ultrasound velocity in wood

2008 ◽  
Vol 56 (2) ◽  
pp. 211-216
Author(s):  
Tomáš Špaček ◽  
Mária Kotlínová ◽  
Michal Kloiber ◽  
Josef Polášek
Keyword(s):  
Ultrasound Velocity ◽  
Diagnostic Methods ◽  
Surface Finishing ◽  
Detector Surface ◽  
Before And After ◽  
Non Destructive ◽  
Ultrasound Testing

Non-destructive diagnostic methods are very useful for monumental buildings. This paper deals with one of these technique, namely with ultrasound testing and influence of surface finishing on ultrasound velocity measured by means of device the Arborsonic Decay Detector. Surface finishing (Primalex – thick synthetic film of the surface finishing, Luxol – Extra – thin synthetic film of the surface finishing and Impranal Profi SL – thick acryl film the surface finishing) were selected and tested in this research. The transmittion time was measured and velocity was converted from it. This was compared before and after application of surface finishing.

Non-Destructive Defectoscopy of Building Structures by Lock-In Thermography

2015 ◽  
Vol 1122 ◽  
pp. 173-176
Author(s):  
Zdeněk Peřina ◽  
Radek Fabian ◽  
Marie Wolfová ◽  
Pavel Valíček ◽  
Vladan Panovec
Keyword(s):  
Heat Flow ◽  
Environmental Change ◽  
Diagnostic Methods ◽  
Building Structures ◽  
Sinusoidal Wave ◽  
Lock In ◽  
Non Destructive ◽  
Destructive Methods

Nowadays there are many diagnostic methods for the detection of different defects in building structures. Destructive methods, which do not enable purposeful redevelopment action or a potential cause prediction of the defect without damage to the structure, are mostly used. Lock-in thermography is based on the modulation of the controlled heat flow, which impact on the diagnosed object. Heat (usually sinusoidal) wave penetrates inside the element and in the place of environmental change, ie. anomalies / deviations in the structure of the material of the tested object are reflected back to the surface. The paper focuses on the possibility of using lock-in thermography in the detection of various defects in building structures.

The Simulation Study on Transformer Oil-Paper Insulation Polarization Spectrum

2013 ◽  
Vol 385-386 ◽  
pp. 1175-1178
Author(s):  
Jun Qiang Zhang ◽  
Tao Zhao ◽  
Yun Peng Liu
Keyword(s):  
Time Constant ◽  
Simulation Analysis ◽  
Debye Model ◽  
Diagnostic Methods ◽  
Transformer Oil ◽  
Equivalent Model ◽  
Polarization Spectrum ◽  
Paper Insulation ◽  
Transformer Insulation ◽  
Non Destructive

Return voltage diagnostic method is an effective method of non-destructive diagnosis in transformer insulating state. The current study is that through experiments get polarization spectrum to analysis the transformer insulating state, but not yet carried out the influence of various factors to the experimental results. So, based on the Debye model and specific parameters comes from one equivalent model of the actual transformer, this paper using RVM methods to simulation analysis maximum return voltage and dominant time constant under different factors. Simulation results show that the diagnostic methods that combine maximum return voltage value with dominant time constant can preferably reflect the transformer insulation state.

Non-destructive detection methods for discontinuities of interconnection structures

2016 ◽  
Vol 33 (1) ◽  
pp. 23-35 ◽  
Author(s):  
Tomas Blecha
Keyword(s):  
Transmission Lines ◽  
Printed Circuit Boards ◽  
Characteristic Impedance ◽  
Diagnostic Methods ◽  
Detection Methods ◽  
Circuit Boards ◽  
Content Type ◽  
Multiple Line ◽  
Detection And Localization ◽  
Non Destructive

Purpose – The purpose of this paper is to demonstrate the non-destructive methods for detection and localization of interconnection structure discontinuities based on the signal analysis in the frequency and time domain. Design/methodology/approach – The paper deals with the discontinuity characterization of interconnection structures created on substrates used for electronics, and methods for their detection and localization, based on the frequency analysis of transmitted signals. Used analyses are based on the theoretical approach for the solution of discontinuity electrical parameters and are the base for diagnostic methods of discontinuity identification. Findings – The measurement results of reflection parameters, frequency spectrums of transmitted signals and characteristic impedance values are presented on test samples containing multiple line cracks and their width reduction. Practical implications – Obtained results can be used practically, not only for the detection of transmission lines discontinuities on printed circuit boards but also in other applications, such as the quality assessment of bonded joints. Originality/value – Developed methods allow the quick identification and localization of particular discontinuities without the destruction of tested devices.

scholarly journals Analysis Of Damage Arising From Exploitation Of The Aircraft

2014 ◽  
Vol 32 (1) ◽  
pp. 5-18
Author(s):  
Piotr Woźny ◽  
Józef Błachnio
Keyword(s):  
Research Methods ◽  
Technical Condition ◽  
Diagnostic Methods ◽  
Non Destructive ◽  
Destructive Methods

Abstract During exploitation, due to a variety of reasons, aircrafts are damaged or suffer from different failures. In the process of operation, using appropriate methods of diagnosis, failure, damage, and relative deregulation of individual elements or units can be detected. For this purpose, one can apply a number of indirect diagnostic methods with the use of recorded diagnostic signals or a direct diagnosis with the use of non-destructive methods. The proper identification of the technical condition allows to determine the causes of irregularities and take actions aimed at preventing their occurrence. The article presents the types of exploitation damage of a multi-purpose aircraft. In addition, the criteria for the division of damage and research methods of the causes of damage are presented. Furthermore, an analysis of the scope of activities to be performed during the research of causes of damage to the aircraft is made.

scholarly journals Non-Destructive Diagnostic Methods for Fire-Side Corrosion Risk Assessment of Industrial Scale Boilers, Burning Low Quality Solid Biofuels—A Mini Review

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7132
Author(s):  
Tomasz Hardy ◽  
Amit Arora ◽  
Halina Pawlak-Kruczek ◽  
Wojciech Rafajłowicz ◽  
Jerzy Wietrzych ◽  
...  
Keyword(s):  
Diagnostic Techniques ◽  
Diagnostic Methods ◽  
Structural Defects ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Solid Biofuels ◽  
Low Emission ◽  
Increased Risk ◽  
Corrosion Risk ◽  
Non Destructive

The use of low-emission combustion technologies in power boilers has contributed to a significant increase in the rate of high-temperature corrosion in boilers and increased risk of failure. The use of low quality biomass and waste, caused by the current policies pressing on the decarbonization of the energy generation sector, might exacerbate this problem. Additionally, all of the effects of the valorization techniques on the inorganic fraction of the solid fuel have become an additional uncertainty. As a result, fast and reliable corrosion diagnostic techniques are slowly becoming a necessity to maintain the security of the energy supply for the power grid. Non-destructive testing methods (NDT) are helpful in detecting these threats. The most important NDT methods, which can be used to assess the degree of corrosion of boiler tubes, detection of the tubes’ surface roughness and the internal structural defects, have been presented in the paper. The idea of the use of optical techniques in the initial diagnosis of boiler evaporators’ surface conditions has also been presented.

scholarly journals Condition Assessment of Low Voltage Photovoltaic DC Cables under Thermal Stress Using Non-Destructive Electrical Techniques

2020 ◽  
Vol 21 (5) ◽  
pp. 503-512
Author(s):  
Ehtasham Mustafa ◽  
Ramy S. A. Afia ◽  
Zoltán Ádám Tamus
Keyword(s):  
Thermal Stress ◽  
Condition Monitoring ◽  
Low Voltage ◽  
Research Work ◽  
Diagnostic Methods ◽  
Voltage Response ◽  
Insulation Material ◽  
On Line ◽  
Non Destructive ◽  
Line Condition

Abstract The output power of the photovoltaic system is heavily dependent on the low voltage (LV) DC cables which are exposed to multiple stresses such as climatic, mechanical, electrical, and thermal stress, hence makes them more exposed to aging as compared to other components in the system. Accordingly, it is essential to monitor the state and know the real cause of the insulation degradation of the cable. The physio-chemical changes inside the insulation during service is attributed to the thermal stress, which the cable has to endure constantly. Traditionally, destructive test techniques have been adopted to study the aging phenomenon in the cable insulation, making them unsuitable for on-line condition monitoring. This research work has been aimed to study the degradation in LV photovoltaic DC cables under thermal stress by measuring the dielectric properties; complex permittivity, tanδ with the change in frequency and decay and return voltage slopes using extended voltage response method. The non-destructive diagnostic methods used are based on the phenomenon of polarization and conduction in the insulation material. The noteworthy change in the values of the imaginary part of permittivity, tanδ at low frequencies, and the overall decrease in the values of return voltage slope showed the change in the structure of the polymer matrix under the stress which was related to the cross-linking based chemical reactions. The results show that the techniques can be adopted for the on-line condition monitoring of the cable for the PV system and the dielectric parameters can be used to study the chemical and physical changes happening inside the material effectively.

Using the Ultrasonic Method for the Defectoscopy of Failures in Reinforced Concrete Columns

2021 ◽  
Vol 322 ◽  
pp. 203-208
Author(s):  
Kristýna Hrabová ◽  
Sabina Hüblová ◽  
Petr Cikrle ◽  
Tomáš Vymazal
Keyword(s):  
Reinforced Concrete ◽  
Ultrasonic Method ◽  
Permanent Deformation ◽  
Concrete Columns ◽  
Diagnostic Methods ◽  
Reinforced Concrete Column ◽  
Existing Structures ◽  
Non Destructive ◽  
Detailed Determination

Using non-destructive diagnostic methods is currently important not only with regard to preserving existing structures but also with regard to sustainable development, which is getting more and more to the forefront of attention. This paper deals with defectoscopy of a reinforced concrete column made with artificially created defects corresponding to the defects in real structures. Modern diagnostic methods enable detailed determination of the properties of structures and detection of their critical points. A method which appears to be very promising in detecting defects and failures is the ultrasonic method. It enables monitoring the development of failures at different levels of loading. Besides that, permanent deformation will also be monitored during the loading using a strain gauge.

Non-invasive and non-destructive techniques in medicine and industry

1979 ◽  
Vol 292 (1390) ◽  
pp. 137-146 ◽  
Keyword(s):  
Diagnostic Methods ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Non Invasive ◽  
Clinical Methods ◽  
Surveillance Method ◽  
The Cost ◽  
Non Destructive ◽  
And Training

The paper deals with the question ‘What can industrial users of radiological and ultrasonic non-destructive testing methods learn from medical users of non-invasive diagnostic methods and vice versa?’ and similarly, 'What can designers of equipment for the two types of users learn from each other?’ It compares the requirements of each of the two disciplines: in medicine, as complementary to clinical methods; in industry, as a maintenance aid and as a surveillance method to assist design. The basis of the comparison is the purpose of the examination, the significance of the cost factor and the differing definitions of quality and safety. The paper also deals with the problem of cooperation and of ‘interfaces' between the various teams, a problem aggravated by different educational and training backgrounds of the various interdependent teams. The above comparison is set into a background of the evolution of the methods, and conclusions are attempted for the future.

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