Ruslan Yermolenko - Academia.edu (original) (raw)
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Papers by Ruslan Yermolenko
arXiv (Cornell University), May 22, 2024
Machinery & energetics, Oct 9, 2023
The research relevance is determined by the need to improve the processes of measurement of objec... more The research relevance is determined by the need to improve the processes of measurement of objects size in hard-to-reach conditions. In the modern industrial environment, where high measurement accuracy is critical for ensuring safety and maximizing the efficiency of production processes, the study of this topic is relevant in the context of rapid technological development and increased requirements for production quality. The study aims to evaluate the possibilities of using modern computer vision methods for measuring and reconstructing objects in difficult technical conditions, such as the enclosure of a water-water power reactor. The study employed 3D photogrammetry methods, including Depth from Stereo and Multi-View Stereo, as well as Structure from Motion methods. The study determined that modern computer vision methods, in particular machine learning methods, can be successfully used for measuring and reconstructing objects in hard-to-reach conditions. The study showed that the measurement accuracy can reach values close to 1 mm under ideal conditions and at a distance of 1.5 from the measuring device to the object. At the same time, the Multi-View Stereo method revealed greater uniformity of the spatial distribution of errors compared to the Depth from the Stereo method. In practice, in the conditions of real photos, the Multi-View Stereo method turned out to be more demanding to accurately determine the position of the camera. Due to its low demand for the exact coordinates of the cameras, the Depth from the Stereo method showed better results, showing less error in the measurements. The study highlighted the possibility of using the proposed method to distinguish fluctuations in the height of the surface of
Machinery & energetics, Feb 5, 2024
Conducting a study on this topic becomes relevant due to the great importance of the safety of cr... more Conducting a study on this topic becomes relevant due to the great importance of the safety of critical infrastructure facilities and the presence of operational defects in equipment elements and pipelines, which poses serious threats, including the possibility of equipment destruction and negative environmental impact. The purpose of this work is to study the possibility of using the diffraction-time technique of ultrasonic non-destructive testing together with a deep convolutional neural network to accurately determine the numerical value of the height of an operational crack. The methods used include the analytical method, classification method, functional method, statistical method, synthesis method, and others. The study found that an automated approach to measuring crack height, based on diffraction signals and the use of neural networks, significantly improved the quality and accuracy of non-destructive testing. Ultrasonic testing is one of the most common inspection methods for detecting service cracks and is considered to be the most effective. It allows for reliable detection of defects and determination of their size without destroying the product. The results of the study emphasize the high potential and efficiency of the method in analysing the data obtained and provide confirmation of its applicability for determining the condition of objects during ultrasonic inspection. The paper emphasizes that these technologies are particularly important and effective. It is noted that their widespread use
Instruments and Experimental Techniques, 2001
A MKC-07 ПОШУК β–γ-radiometer and dose-rate meter based on Geiger–Muller tubes is described. By u... more A MKC-07 ПОШУК β–γ-radiometer and dose-rate meter based on Geiger–Muller tubes is described. By using an unconventional signal-processing method, it is possible to extend the dynamic range of the instrument by a factor of 10–50, depending on the type and number of detectors in use, and to significantly reduce the error in measuring time-dependent ionizing-radiation intensities. The combination radiometer and dose-rate meter is used to determine the characteristics of constant and nonstationary ionizing-radiation fields.
One of the actual problems of safe and reliable operation of NPP units with pressurized reactors ... more One of the actual problems of safe and reliable operation of NPP units with pressurized reactors is the development of tube plugging criterion for steam generator tubing. The basis for plugging criterion development is associated with existence of flaws with critical sizes at steam generator tubes. For effective application of this criterion the conditions of flaw instability should be analyzed and critical flaw sizes must be determined. Analytical investigation of flaws stability at steam generator tubes is carried out in this paper for semi-elliptical cracks since some of flaws at steam generator tubes for VVERs are similar to such cracks. The analytical solution of thermo-elastic problem dealing with the determination of stresses in tubes wall is presented. It makes it possible to perform linear fracture mechanics analysis with the aim to determine the conditions of crack instability. The approach to develop steam generator tube plugging criteria on the base of obtained results i...
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presen...
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presents the status of efforts by the Ukraine Nondestructive Certification and Training Facility (NDEF) Eddy Current laboratory to improve eddy current inspection in Ukraine.
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presen...
arXiv (Cornell University), May 22, 2024
Machinery & energetics, Oct 9, 2023
The research relevance is determined by the need to improve the processes of measurement of objec... more The research relevance is determined by the need to improve the processes of measurement of objects size in hard-to-reach conditions. In the modern industrial environment, where high measurement accuracy is critical for ensuring safety and maximizing the efficiency of production processes, the study of this topic is relevant in the context of rapid technological development and increased requirements for production quality. The study aims to evaluate the possibilities of using modern computer vision methods for measuring and reconstructing objects in difficult technical conditions, such as the enclosure of a water-water power reactor. The study employed 3D photogrammetry methods, including Depth from Stereo and Multi-View Stereo, as well as Structure from Motion methods. The study determined that modern computer vision methods, in particular machine learning methods, can be successfully used for measuring and reconstructing objects in hard-to-reach conditions. The study showed that the measurement accuracy can reach values close to 1 mm under ideal conditions and at a distance of 1.5 from the measuring device to the object. At the same time, the Multi-View Stereo method revealed greater uniformity of the spatial distribution of errors compared to the Depth from the Stereo method. In practice, in the conditions of real photos, the Multi-View Stereo method turned out to be more demanding to accurately determine the position of the camera. Due to its low demand for the exact coordinates of the cameras, the Depth from the Stereo method showed better results, showing less error in the measurements. The study highlighted the possibility of using the proposed method to distinguish fluctuations in the height of the surface of
Machinery & energetics, Feb 5, 2024
Conducting a study on this topic becomes relevant due to the great importance of the safety of cr... more Conducting a study on this topic becomes relevant due to the great importance of the safety of critical infrastructure facilities and the presence of operational defects in equipment elements and pipelines, which poses serious threats, including the possibility of equipment destruction and negative environmental impact. The purpose of this work is to study the possibility of using the diffraction-time technique of ultrasonic non-destructive testing together with a deep convolutional neural network to accurately determine the numerical value of the height of an operational crack. The methods used include the analytical method, classification method, functional method, statistical method, synthesis method, and others. The study found that an automated approach to measuring crack height, based on diffraction signals and the use of neural networks, significantly improved the quality and accuracy of non-destructive testing. Ultrasonic testing is one of the most common inspection methods for detecting service cracks and is considered to be the most effective. It allows for reliable detection of defects and determination of their size without destroying the product. The results of the study emphasize the high potential and efficiency of the method in analysing the data obtained and provide confirmation of its applicability for determining the condition of objects during ultrasonic inspection. The paper emphasizes that these technologies are particularly important and effective. It is noted that their widespread use
Instruments and Experimental Techniques, 2001
A MKC-07 ПОШУК β–γ-radiometer and dose-rate meter based on Geiger–Muller tubes is described. By u... more A MKC-07 ПОШУК β–γ-radiometer and dose-rate meter based on Geiger–Muller tubes is described. By using an unconventional signal-processing method, it is possible to extend the dynamic range of the instrument by a factor of 10–50, depending on the type and number of detectors in use, and to significantly reduce the error in measuring time-dependent ionizing-radiation intensities. The combination radiometer and dose-rate meter is used to determine the characteristics of constant and nonstationary ionizing-radiation fields.
One of the actual problems of safe and reliable operation of NPP units with pressurized reactors ... more One of the actual problems of safe and reliable operation of NPP units with pressurized reactors is the development of tube plugging criterion for steam generator tubing. The basis for plugging criterion development is associated with existence of flaws with critical sizes at steam generator tubes. For effective application of this criterion the conditions of flaw instability should be analyzed and critical flaw sizes must be determined. Analytical investigation of flaws stability at steam generator tubes is carried out in this paper for semi-elliptical cracks since some of flaws at steam generator tubes for VVERs are similar to such cracks. The analytical solution of thermo-elastic problem dealing with the determination of stresses in tubes wall is presented. It makes it possible to perform linear fracture mechanics analysis with the aim to determine the conditions of crack instability. The approach to develop steam generator tube plugging criteria on the base of obtained results i...
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presen...
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presents the status of efforts by the Ukraine Nondestructive Certification and Training Facility (NDEF) Eddy Current laboratory to improve eddy current inspection in Ukraine.
Currently, there are three remote automated eddy current inspection systems supplied in Ukraine u... more Currently, there are three remote automated eddy current inspection systems supplied in Ukraine under international cooperation agreements for examination of steam generators, collectors and steam generator tubing. Since 1966 the field experience in using eddy current testing (ET) for in-service inspection of VVER designed steam generators in Ukraine has shown several advantages over the previous inspection methodology which was an air bubble leakage technique. However, the field experience in using eddy current inspection technology has also shown that inspections are not always reliable. Some nuclear power plants have experienced unplanned shutdowns due to leaks in steam generator tubes, some of which were tested by ET prior to the leak. Therefore, eddy current inspection has shown significant improvement over previous testing techniques, field experience also shows the necessity to improve the ET inspection reliability as applied at Ukraine nuclear power plants. This paper presen...