The paper dwells upon the precision of vibration parameter-based diagnostics of asynchronous motors with continuous monitoring systems. For diagnostics of asynchronous motors, it is important to separate mechanical and electrical components of a signal using its long selection ensuring necessary resolution capability. In that case, a combined monitoring algorithm is used to separate the mechanical and electrical components of a signal, although the monitoring period remains minimal. Using the empirically acquired data we found out the suggested combined algorithm separates mechanical and electrical components and ensures minimal monitoring period.
Kostyukov Al.V., Boychenko S.N., Dudkin A.V. Increasing precision of asynchronous motor diagnostics in real-time monitoring systems // THE YOUNG RUSSIA: BREAKTHROUGH TECHNOLOGIES – INTO PRODUCTION. - No 1, - 2017. - p.249-254
To determine machinery condition methods of vibration diagnostics are widely used today. Those methods are utilized in personal, bench and stationary systems and adapted for various causes, including diagnostics of asynchronous motors by the vibration parameters of their bearing units.
Asynchronous motors can have specific defects of the electromagnetic system. Such defects are detected by the vibration diagnostic methods, but it’s quite difficult to localize and classify them. That might be connected with the fact that vibration signals may reflect processes undergoing on the stator windings, iron core and rotary conduction system.
The partial discharge method increases precision of the diagnostics since various defects of the electromagnetic system have different values of partial discharge parameters. For instance, one can determine a stator winding phase in which the defect is developing. A combination of vibration diagnostics and partial discharge methods helps to detect defects of asynchronous motor electromagnetic system using various physical effects simultaneously to increase the precision of diagnostics.
Kostyukov Al.V., Boychenko S.N., Schelkanov A.V., Burda E.A Combining methods of vibration diagnostics and partial discharges for asynchronous motor diagnostics // THE YOUNG RUSSIA: BREAKTHROUGH TECHNOLOGIES – INTO PRODUCTION. - No 1, - 2017. - p.28-32
The paper describes a study of vibration parameters distribution laws for in-operation vibration in rotary units. To evaluate the reliability of rotary units’ diagnostics it is important to know the nature of the distribution of diagnostic signs characterizing the equipment operation. The chi-squared test is used to check whether the empiric distribution belongs with the theoretical one. The experimental data helped to determine that an empiric distribution of diagnostic signs in rotary equipment is best to be described with a logarithmically normal distribution law.
Kostyukov V.N. Zaytsev A.V., Teterin A.V., Basakin V.V. Studying vibration parameters distribution laws for in-operation vibration in rotary units // THE YOUNG RUSSIA: BREAKTHROUGH TECHNOLOGIES – INTO PRODUCTION. - No 1, - 2017. - p.33-36 (http://elibrary.ru/title_about.asp?id=41264)
The paper dwells upon an urgent problem of specialist training in various industries considering specific training programs for colleges and universities and demands of actual productions. Based on the specialist training program analysis, experience of the NDT personnel pre-certification training and college/university student training, communication with personnel of the existing production facilities, it was concluded that not only college training programs, but personnel training systems should be changed in order to comply with existing order at the modern enterprises of various industries.
Kostyukov V.N., Kosyih A.V., Naumenko A.P. On training scientific and engineering personnel and certification of NDT and technical diagnostic specialists // Kontrol. Diagnostika. - 2017. - p. 38-44
The paper dwells upon problems of modeling vibration-acoustic (VA) signals of machines and mechanisms. Its main objective is creating approaches to developing a phenomenological model of VA signal structure during the occurrence of defects and malfunctions. Partial models of VA signal structures of certain malfunctions of piston machines are suggested.
Kostyukov V.N., Naumenko A.P. Generalized model of vibration-acoustic signal structure and formation mechanism // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p.187-196
The paper dwells upon methodical issues of using shaft sensors for balancing and monitoring of imbalance in super-critical rotors. On the example of shafting with four rotary-table bearings, there are various results of different types of and finding distributed imbalance of a super-critical rotor with five discs.
The suggested method allows giving a constant estimation of residual imbalance state in modern systems of monitoring and technical diagnostics.
Kumenko A.I., Kuzminyih N.Yu., Timin A.V. Monitoring distributed imbalance of experimental rotor using shaft sensor // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p. 186-187
The paper dwells upon the methodology of using shaft sensors in systems for vibration control, monitoring and automatic diagnostics of power units’ condition. It suggests the ways of improving the regulatory environment in monitoring and diagnostic systems for turbine units.
Apart from traditional vibration-parameter-based criteria stated by GOST R 55263-2012 and GOST R 55265.2-2012, we suggest additional criteria for reliability of rotors and turbine units supported by sleeve-type bearings. First of all, those are criteria for static and dynamic responses, as well as criteria for a shaft floating. For static responses we suggest, on the first stage, a maximum permissible deviation of 40% from the rotor’s weight. For dynamic responses, we suggest standards for dynamic loads due to residual imbalance. For sub-critical rotors, the dynamic load must not exceed 5 % from the rotor’s weight, supported by the bearings. For super-critical rotors - 2 % maximum.
We suggest methods for their rating by the results of measuring static and dynamic displacements of the rotors’ necks. The paper gives examples of modeling static and dynamic forces in a power turbine unit’s bearings. Also, there are examples of modeling static and dynamic forces in turbine units’ bearings.
Those criteria of rotary units’ operation status imply using a full system of shaft sensors measuring displacement from both sides of the bearing as per GOST R 55263-2012, unlike ISO 13373-3: 2015, since for an introduction of the said criteria one needs to know quite precisely the position of shaft neck in the bearing bore.
The formulated criteria can be used for machinery status assessment in modern automatic diagnostic systems.
Kumenko A.I., Kuzminyih N.Yu., Timin A.V. Reliability criteria and condition monitoring of power turbine units using static and dynamic powers in shafting supports // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p. 181-186
The paper provides an analysis of standard documents - ISO standards and Russian GOST analogues, such as: ISO 13379- 2:2014 (GOST R ISO 13379- 2- 2016) Condition monitoring and diagnostics of machines - General guidelines on data interpretation and diagnostics technique. Part 2. Data-driven applications; ISO 13373-3:2015 (GOST R ISO 13373- 3- 2016) Condition Monitoring And Diagnostics Of Machines — Vibration Condition Monitoring — Part 3: Guidelines For Vibration Diagnosis; ISO 13373- 9:2015 (GOST R ISO 13373- 9- 2016) Condition monitoring and diagnostics of machines - Vibration condition monitoring - Part 9: Diagnostic techniques for electric motors.
Kumenko A.I., Kuzminyih N.Yu On additional requirements to vibration control and condition monitoring systems for turbine units of TPS and NPC // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p. 174-180
For companies with an uninterrupted production cycle where the technology of operation is strictly set, the main problem of efficiency increasing is the reliability of equipment which is greatly influenced by the personnel operating various production processes in real time and often causing degradation of its condition. Combined with severe wear out of the main equipment featured at the majority of production and transport companies, the personnel’s negative impact on equipment condition leads to considerable losses due to accidents and downtime, as well as the high cost of repair.
Kostyukov V.N., Kostyukov A.V., Kostyukov Al.V., Boychenko S.N., Kazarin D.V. Automatic systems for health monitoring of production and transport industries providing high safety and efficiency // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p. 167-174
A big share of machinery failures (40÷50 %) is caused by the destruction of rolling bearings. To prevent sudden failures of rolling bearings a vibration diagnostics system for in-operation monitoring of bearings must be installed.
Virtually all methods of condition diagnostics of rolling bearings are based on the analysis of vibration-acoustic signals in time or frequency area. To increase the accuracy of diagnostic results, there is an urgent task aimed at developing new methods.
The paper dwells upon the problems of practical use of vibration characteristic function (CF) parameters for evaluation of rolling bearings’ condition. It describes an experimental system, system of diagnostic signs based on CF parameters, methods for obtaining experimental data, results of the data processing.
Kostyukov V.N., Kostyukov Al.V., Boychenko S.N. Application of characteristic function of vibration for condition diagnostics of rolling bearings // Proceedings of the XXI Russian NDT and Diagnostics Conference. - Moscow: "Spektr" Publishing House, 2017. - p. 155-162