The features of Real-time condition monitoring of machinery and the differences from On-line and Off-line condition monitoring are considered. Taking into account a human factor, the monitoring system model has been reviewed. This model shows that observability of the units state and the entire production complex equipment can be provided by measuring the diagnostic signals (vibration parameters) and rate of their change, which show accurately within scale the generalized units errors and rates of their growth, as well as residual life and its reducing, and the whole complex safety.
Determinate partial ageing functions and their rates, defined by the generalized errors, structural parameters and rates of their growth are offered to be used as variables of the unit’s state. Regularities for petrochemical complex units operation based on a sporadic character of control actions, which are the framework of the monitoring system generalized model, are identified taking into account the human factor.
Technical state of the production complex and correspondingly the risk of its operability loss are offered to be evaluated according to a minimum residual operability and a maximum rate of its loss, observed by the diagnostic and monitoring systems among the units group composing the complex. The required operational speed of the diagnostic and monitoring systems (DMS) is offered to estimate the maximum rate of the petrochemical complex residual operability loss according to the observability criteria of the monitoring theory Conclusions:
Monitoring allows to transfer the equipment and production complexes failures from a “sudden” to a “gradual” category;
Necessity of the failures reduction by ten times and corresponding increase of the equipment run-to-failure requires decrease of the monitoring mistakes to minimum (zero);
Decrease of a statical error and the implementation period reducing up to some months requires development of diagnostic methods and standard techniques invariant to the equipment type diagnostic features formation;
Decrease of a dynamic error requires a significant excess of the monitoring pace over pace of failures development at the production complexes, thus excluding a manual labor by means of automation of all monitoring processes: from parameters measurement and automation of a diagnostic output of information on the equipment state up to its unhampered and timely delivery and presentation to all levels of the production complex control.
Kostyukov V.N, Kostyukov A.V. Real-time monitoring of machinery malfunctions // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.83.
Current Russian and International standards in the field of standardizing parameters for piston machines vibration including piston compressors are reviewed. It is shown that the current standards do not meet the requirements for the piston compressors safe operation at hazardous production facilities. The article describes the Russian Federation National Standard "Condition monitoring and diagnostics of machines. Hazardous equipment monitoring. Vibration generated by rotodynamic pump and compressor units".
Kostyukov V.N, Naumenko A.P. Standardization in vibration monitoring of piston compressors // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.82-83.
Operation experience and results of the COMPACS® stationary system for machinery health monitoring and automatic diagnostics are given. The system manufactured by DYNAMICS SPC is intended to prevent sudden failures and breakdowns of the CDU-VDU equipment, shifting them from the sudden to the observed category. The system warns the staff about changes in the equipment technical state, giving recommendations to take urgent actions in order to lead the equipment into "acceptable" technical state.
Description of the system operation in real conditions is given, and analysis of the dynamic equipment operation is carried out. Reasons of the equipment failures are described, and recommendations for improving technical and economic parameters of the equipment operation and maintenance cycle optimization are offered.
Kostyukov An.V., Kostyukov Al.V., Tarasov E.V., Putintsev S.L., Chatkin A.P. Operation of equipment for primary oil processing under control of the COMPACS stationary system for health monitoring and automatic diagnostics // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.81.
The efficiency of malfunction detection for machinery protected by diagnostic and condition monitoring systems is strongly dependent from quality of their tuning, full and objective examination during post-production acceptance tests. However, the task of minimizing the influence of human factor on design quality check-up and tuning process can be successfully solved by automatic test benches.
A test bench provides automation of the most laborsome tasks, such as:
Diagnostic feature calibration in measuring channels;
Metrological check-up for measuring channels;
Expert system check-up, including defect signal formation and registering of the expert system messages;
Automatic formation and printing of a test report, as well as database storage of the results.
Tarasov E.V., Kazarin D.V., Zaytsev A.V., Pavlenkov D.V., Kostuykov V.N. Automatic test bench for machinery diagnostic and condition monitoring systems // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.80-81.
The research is based on the data obtained by an on-board monitoring system COMPACS®-EXPRESS-3 and aimed mostly at increasing reliability of machinery diagnostics of rolling stock units (in electric trains) by finding codependences in changes of vibration diagnostic features during condition degradation process from analyzing statistic properties of their distribution.
At the same time, the results obtained during the course of work are invariant to the diagnostic subject and can apply to machinery in hazardous production facilities in FEC.
The completed research allowed to establish the criteria according to which the cases of defect development were found using trends of vibration diagnostic features.
Tsurpal A.E., Kazarin D.V., Dederer Ya.V., Kostuykov V.N. The research of vibration activity of machinery units by vibration parameter trends // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.78-79.
The paper is aimed at researching the influence of rotation frequency and condition of rolling bearings on the level of vibration spectrum components which corresponds to the frequencies of rolling element bearing defects exposure.
The research is based on a theory of experimental planning using an experimental stand to assign frequency and record vibration signals. Different types of bearings have been subjected to the experiment: regular rolling bearings as well as rolling bearings with artificiality created defects and bearings with defects obtained during long-term operation.
The obtained results show the direct dependence between the level of spectrum components corresponding to the frequencies of rolling bearing defect exposure and rotation frequency. It should be noted, that such sensitive dependence is directly connected with condition of the rolling bearing under analysis
These results laid a foundation for creating mathematical models of rolling bearings vibration used in automatic expert systems for rolling bearing diagnostics.
Basakin V.V., Kazarin D.V., Zaytsev A.V., Teterin A.O., Kudryavtseva I.S. The research of rotation frequency influence and technical state condition upon the level of vibration spectrum components of rolling bearings // 5th International Conference on Oil and Gas Engineering. – Omsk: INTECH Edit., 2015 – p.79-80.
The paper dwells upon the method of calculation of guideline values of diagnostic signs in terms of statistical decision-making theory. It gives an example of calculation of the probability of the defect skipping and false alarms, the risk of the failure skipping while selecting the size of the regulatory characteristic of different decision-making methods.
It is shown that it is reasonable to use a method of minimum number of false decisions if the costs of false alarms and defect skipping are comparable. If the defect skipping cost is considerably higher than the cost of the false alarm it is advisable to use method of Neumann-Pearson. Selection of threshold values of diagnostic signs according to their distribution functions for different states of a machine under diagnostics should be made when the probability rates are >0.93 and <0.95.
Kostyukov V.N., Naumenko A.P. Risk assessment of selection of guideline values of diagnostic signs // Condition Monitoring and Machinery Failure Prevention Technologies (СМ/MFPT 2015)
The paper dwells upon new approaches towards imbalance diagnostics for both – separate rotors and shaft rotors. The methods are based on comprehensive usage of sensors for absolute support displacement and relative/absolute shaft displacement.
There are a lot of tasks to be solved with such sensors’ application, but the main one is the diagnostics of imbalance and its spreading area. The present paper covers only that one task.
Along with minimizing the absolute radial vibrations of journals and supports, it is also suggested to minimize turning angles of journals and consequently decrease the residual rotor vibration. The method can be utilized witht the COMPACS® system and intended for morden systems of imbalance monitroing and diagnostics and its automatic detection.
Kumenko А.I. Balancing of flexible rotors and shafting systems based on the COMPACS systems with the use of shaft sensors // Neftegaz.ru. – 2015. – №3. – p. 58-61.
Safe resource-saving operation of the machinery of the industry and transport branches is a very urgent task. Real-time condition monitoring of the machinery provides observability and allows to implement safe resource-saving technology of the machinery maintenance and repair. This paper considers the experience in operation of systems for health monitoring of hazardous production facilities and the machinery of energy sector and rail transport in case of smooth or discontinuous changes in vibration diagnostic features that reflect the corresponding multi-stage processes of destruction machines generating multimodal trends vibration parameters.
The paper proves that real-time condition monitoring systems increase diagnostics productivity in million times in comparison to "manual" tools, and provide economical effect for a consumer due to:
Increase of technogenic safety and machinery run-to-failure in dozens and hundreds of times.
Increase of readiness coefficient and main production assets usage coefficient.
Kostyukov V.N., Tarasov E.V. Real time vibration-diagnostic condition monitoring of production and transport complex machinery // Condition Monitoring and Machinery Failure Prevention Technologies (СМ/MFPT 2015)