scholarly journals Methodological approach to the research of energy cogeneration systems operational reliability indicators

2021 ◽  
Vol 6 (3) ◽  
pp. 263-276
Author(s):  
A. Domnikov ◽  
M. Khodorovsky ◽  
L. Domnikova
Keyword(s):  
Methodological Approach ◽  
Operational Reliability ◽  
Reliability Indicators

scholarly journals Reliability of the RBMK-1000 coolant flow measurement system

2019 ◽  
Vol 5 (1) ◽  
pp. 81-87
Author(s):  
Arkady I. Pereguda
Keyword(s):  
Mathematical Model ◽  
Measurement System ◽  
Flow Measurement ◽  
Rotation Period ◽  
Operation Time ◽  
Operational Reliability ◽  
Coolant Flow ◽  
Reliability Indicators ◽  
Parametric Reliability ◽  
Two Parameters

An analysis of statistical data of diagnostic measurements of two parameters determining the performance of the RBMK-1000 SHADR-8A flowmeters – the minimum value of the negative amplitude half-wave at the transistor flow measuring unit (TIBR) input and the mean-square deviation over the flowmeter ball rotation period – made it possible to develop a mathematical model of the flowmeter parametric reliability. This mathematical model is a random process, which is a superposition of two delayed renewal processes. Studying the flowmeter operational reliability model provides an exponential estimate of the probability that the parameters determining the flowmeter performance will not exceed the specified levels. Using the Bernoulli scheme and the probability-estimating relationship for the flowmeter performance parameters, it is possible to calculate the probability of failure-free operation of both a single reactor quadrant and the coolant flow measurement system. In addition, it becomes possible to estimate the quadrant failure rate. Important for practice is the possibility of predicting the number of failed flowmeters depending on the system operation time. An indicator of the system reliability can be the average number of failed flowmeters, the relation for which is given in the paper. All the research results were obtained without any additional assumptions about the random values distribution laws. The obtained results can be easily generalized for the cases when the vector dimension of the determining parameters is greater than two. The use of the results of this study is illustrated by calculated quantitative values of the flowmeter parametric reliability indicators and the coolant flow measurement system.

scholarly journals Stochastic models for ensuring parametric reliability of the construction machines

2021 ◽  
pp. 262-273
Author(s):  
Galyna Getun ◽  
Vitalii Les'ko ◽  
Iryna Bezklubenko ◽  
Olena Balina ◽  
Yurii Butsenko
Keyword(s):  
Methodological Approach ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Technical Condition ◽  
Technical Problems ◽  
Reliability Models ◽  
Reliability Indicators ◽  
Hydraulic Machines ◽  
Parametric Reliability ◽  
Analysis Of Failures

The solution of technical problems to ensure the working capacity is largely determined by the effectiveness of theoretical and applied developments in an area of estimation and prediction of their reliability indicators. An effective approach to the analysis of failures and the development of operability and parametric reliability models provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydro drive elements of construction machines, their relationships and features of the formation of parameters failures. And this will allow to get more real and accurate results of estimation of reliability indicators of hydraulic drives of both construction and other hydraulic machines. They do not exhaust all possible variants of models that can take place when analyzing the reliability of hydraulic drives of machines, but at the same time they to a certain extent extend and refine the set of known reliability models. Specific in terms of formation of parametrical failures are such consistently connected in terms of the layout of hydraulic elements, as working sections of hydraulic distributors and hydraulic cylinders, which are part of the subsystems of GPs and form the so-called functional areas (FA). Reaching the FA limit is a compatible result of the combined random process of evolution of the volumetric efficiency JCUA  these elements, and the technical condition of the FA is estimated to be generalized by the JCUA, which equals the product of the JCUA of consecutively connected elements: . In this case, the probability of maintaining the capacity of the FA will be: . The processing of diagnostic information and the study of the reliability of GPs in real conditions of their operation showed that the distribution of JCUD hydraulic elements with a sufficient degree of consistency can be described under several theoretical laws. It is considered when the JCUA sections of the hydraulic distributor and hydraulic cylinder are distributed by gamma distribution and exponential distribution. The use of the general methodological approach to the analysis of failures and the construction of models of operability and parametric reliability provides an opportunity to obtain more adequate models of reliability of hydraulic drives of machines, as they more fully take into account the specifics of the structure and functioning of the hydraulic drive elements, They don't exhaust all possible models that can take place when analyzing the reliability of hydraulic drives, but at the same time they are to some extent expanding and refining the range of already known models of reliability.

scholarly journals METHODOLOGICAL APPROACH TO DETERMINATION OF THE TREND OF CHANGES IN AIRCRAFT RELIABILITY INDICATORS OF AVIATION EQUIPMENT ON THE EXAMPLE OF STATE AVIATION HELICOPTERS

2020 ◽  
pp. 42-51
Author(s):  
V. Golub ◽  
O. Bursala ◽  
V. Chupryna
Keyword(s):  
Methodological Approach ◽  
Statistical Processing ◽  
Armed Forces ◽  
Mean Value ◽  
Control Limit ◽  
Acceptable Level ◽  
Reliability Indicators ◽  
The Mean ◽  
Index Level

The problem of flight tsafety , without regard to swift scientific and technical progress in industry of aviation equipment, become exceptionally sharp in our time. The statistical processing of empiric data is an actual task in monitoring of process of exploitation of propulsion MODULE of the Armed Forces of Ukraine and determination of tendencies of technical service and repair, directions of modernisation of armament and military equipment. The article considers the approach of the systems to the evaluation of reliability and safety of flights in relation to accomplishment of combat missions and preventionof aviation accidents. A methodological approach to the mathematical processing of statistical information for the period 2016-2019 on malfunctions was developed. The quantitative evaluation of their level is conducted on the generally accepted standardized indexes (statistical and probabilistic), specific methodology was here used. Index "parameter of failure flow" that characterizes the level of operating reliability and index "level of accident rate" that characterizes safety of flights were used in this methodology on ІСАО recommendation. Certain trends of changes of these indexes, the “upper control limit of reliability" and the considered conception of acceptable level of safety performance ( ALoSP) are expected for future periods for the different types of helicopters. On the base of operating data, the prognosis indexes expected, "upper control limit of reliability" on 2020 for the specific types of helicopters. As expected, according to obtained results, for all types of helicopters the mean value of this index will make not more than 4,3 failures per 100 flight hours. In accordance to conception of "acceptable level of "ALoSP" it is possible to distinguish three levels or "triggers" of flights safety : Acceptable level (Acceptable), special purpose level (Target), Critical level (Alert). These "triggers" are calculated taking into account the mean value of statistical sets of data about failures (for the last 3 years) and standard deviation that gives an opportunity to define the necessary additional measures of management to provide safety of flights. Authors came to the conclusion that conception of ALoSP is suitable for the evaluation of efficiency to provide flights safety of aviation of the Armed Forces of Ukraine with implementation of necessary adaptation to the existent terms of application of UKR aviation.

scholarly journals Assessment of Operational Reliability Indicators of Mine Hydraulic Excavators

2020 ◽  
pp. 745-756
Author(s):  
Vladimir V. Moskvichev ◽  
Maksim A. Kovalev
Keyword(s):  
Coal Mine ◽  
Random Variables ◽  
Operational Reliability ◽  
Main Equipment ◽  
Reliability Indicators ◽  
Hydraulic Excavators

The results of the reliability indicators study of mine hydraulic excavators in the coal mine «Kolyvansky» of JSC «Siberian Anthracite» are presented. The analysis of the reliability indicators changes of the main equipment assemblies and excavators in general is performed. Quantitative values of the random variables have been determined, and the effectiveness of the existing system for collecting and analyzing information about the excavators reliability has been assessed. The rating of reliable hydraulic excavators in the coal mine «Kolyvansky» has been compiled

scholarly journals DETERMINATION OF OPERATIONAL RELIABILITY INDICATORS OF AVIATION EQUIPMENT TAKING INTO ACCOUNT ICAO RECOMMENDATIONS

2021 ◽  
pp. 25-35
Author(s):  
O.L. Bursala ◽  
V.M. Golub ◽  
O.M. Cherednikov ◽  
V.M. Chupryna ◽  
I.V. Kovalenko
Keyword(s):  
Operational Reliability ◽  
Functional Systems ◽  
Reliability Indicators ◽  
Equipment Reliability

On the basis of the developed technique for estimation of aviation equipment reliability indicators, the results of determination of orientating reliability indicators of helicopters and their functional systems are presented. The list and the main reasons for the change of reliability indicators for 2016–2020 are determined.

scholarly journals Assessment of operational reliability indicators of pit rope-operated excavators

2020 ◽  
Vol 6 (4) ◽  
pp. 25-44
Author(s):  
Vladimir V. Moskvichev ◽  
Maksim A. Kovalev
Keyword(s):  
Coal Mine ◽  
Operational Reliability ◽  
Current Level ◽  
Operating Conditions ◽  
Reliability Indicators

The results of the study of operation reliability indicators of rope-operated excavators for 20172019 in the conditions of the Kolyvansky coal mine of Siberian Anthracite JSC are presented. The analysis of changes in reliability indicators of the main groups of equipment is performed. The conclusion is made about the current level of reliability for the main groups of excavator equipment and the components of the equipment that require increasing operational reliability are identified. The rating of reliability among rope-operated excavators used in the conditions of the Kolyvansky coal mine has been compiled. Recommendations have been developed to maintain and improve the reliability of the main groups of equipment and they components for rope-operated excavators in operating conditions at the Kolyvansky coal mine.

Analytical assessment of predicted operational reliability indicators for electric centrifugal pump installations based on empirical observations of their failures

2020 ◽  
pp. 31-35
Author(s):  
Людмила Yushin ◽  
I.YU. Byikov
Keyword(s):  
Statistical Analysis ◽  
Centrifugal Pump ◽  
Operational Reliability ◽  
Replacement Rate ◽  
Mean Time Between Failures ◽  
Reliability Indicators ◽  
Time Between Failures ◽  
Analytical Assessment ◽  
Mean Time ◽  
Electric Centrifugal Pump

Analytical assessment of predicted operational reliability indicators for electric centrifugal pump installations based on empirical observations of their failures A methodology for the analytical assessment of predicted operational reliability indicators of equipment based on empirical observations of failures (using the example of electric centrifugal pump installations for oil production) is presented. Keywords: electric centrifugal pump installation, indicators of operational reliability, mean time between failures, statistical analysis, forecast indicators, Weibull distribution, critical service life, recovery rate, replacement rate, analytical method. [email protected]

scholarly journals DETERMINATION OF THE TREND OF CHANGES OF RELIABILITY INDICATORS OF STATE AVIATION HELICOPTERS ACCORDING TO OPERATING DATA

2020 ◽  
pp. 17-27
Author(s):  
V. Golub ◽  
V. Bashynskyi ◽  
M. Zhdaniuk
Keyword(s):  
High Reliability ◽  
Statistical Processing ◽  
Armed Forces ◽  
Operational Reliability ◽  
Flight Safety ◽  
Aviation Accidents ◽  
Reliability Indicators ◽  
Equipment Reliability ◽  
Reliability Characteristics ◽  
Different Types

The most important characteristics of the processes efficiency in aircraft equipment technical operation are the operational reliability characteristics. High reliability of aviation equipment is the main condition for its readiness, efficiency and safety. The aircraft equipment reliability is its ability to perform specified functions, maintaining during some time the values of the established flight and technical and operational indicators within the specified limits, which correspond to the specified modes and conditions of use, maintenance, repair, storage and transportation. Despite the quick scientific and technological progress in aviation, the problem of flights safety has become extremely acute in the present time. Empirical data statistical processing is an urgent task in monitoring of the Ukrainian Armed Forces aircrafts operation and determining trends in maintenance and repair, areas of modernization of armaments and military equipment. The subject of the work is the analysis and system approach based on the developed estimation technique of aviation equipment reliability indicators. The results of determined helicopters and their functional systems reliability are presented. The trend and the main reasons for the change in reliability indicators for 2016-2019 are determined. The main purpose of reliability analysis is to determine the causal relationships between quantitative and qualitative reliability indicators and the level of flight safety that lead to aviation accidents. Statistical information in the form of fault records and reports, where the generalized operational data are sent by the State aviation units according to the methodical recommendations. Indicators analysis of operational reliability and flights safety for helicopters according to statistical data of failures, damages and incidents is done. Moreover, the trend and the main reasons for the helicopters reliability indicators changes for the period 2016-2019 are defined. The results of research are presented in the final tables, which show the average values of operational reliability, flight safety and the level of combat flight task for different types of helicopters in all specialties. The causes of malfunctions that affect the level of operational reliability, flight safety and non-fulfillment of the flight task on helicopters for the period 2015-2019 were taken into account. According to the statistics analysis of the malfunctions reported causes , it is determined that the total number of reported malfunctions on different types of helicopters in 2019 increased by 11.0% compared to 2018, compared to 2017 by 43.7%, compared to 2016 by 58.4%, compared to 2015 by 70.0%.

scholarly journals REMOTE CONTROL SYSTEM FOR TECHNOLOGICAL PARAMETERS OF PRESSED PILES

2020 ◽  
Vol 11 (3) ◽  
pp. 18-28
Author(s):  
A. N Gaido ◽  
A. G Pogoda ◽  
L. M Kolchedantsev ◽  
D. V Vershinin
Keyword(s):  
Relevant Information ◽  
Operational Reliability ◽  
Labor Costs ◽  
Technological Parameters ◽  
Satellite Navigation System ◽  
Reliability Indicators ◽  
Building Information ◽  
Reducing Costs ◽  
The Cost ◽  
Constituent Elements

The article discusses the results of research in the field of developing a system that in real time allows you to display and remotely transmit the main technological parameters of indentation of factory-made piles (values of indentation forces, number and depth of immersed piles, their displacement relative to the design position). Unlike existing analogues, it allows you to additionally guide the installation of the indentation on the dive points of piles without instrumental removal of their position on the ground. This is done by orienting the installation through a global satellite navigation system. And the position of the piles is set automatically by calculating their coordinates obtained from the project in dfx format, previously entered into the memory of the on-board computer. The constituent elements of such a system are presented, as well as the interface for setting up and displaying technological parameters. The main technological indicators of the process in remote mode can be displayed on the display of any mobile device. It is shown that the cost of such a system is 8 % of the cost of the installation of the indentation of piles. It has been established that it pays off by reducing costs with the subsequent strengthening of grillage structures. These additional works are eliminated due to the prompt elimination of identified deviations, as well as improving the accuracy of installation of piles in the design position. The article presents an algorithm for performing work when setting up the system, receiving and transmitting relevant information. It is shown which participants at different stages will be involved in these processes. In conclusion, various performance indicators for the implementation of such a system are presented. Based on the results of the timing, it is proved that its use allows to reduce the duration and labor costs of both the production of works and the preparation of executive documentation. In addition, the information obtained can be integrated into the building information model, which will allow analyzing the operational reliability indicators of pile foundations.

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