scholarly journals ON DEVELOPMENT OF AVIATION EQUIPMENT’SRELIABILITY MODELS (ON THE EXAMPLE OF HELICOPTERS)

2020 ◽  
pp. 8-16
Author(s):  
A. Bursala ◽  
O. Tcherednikov ◽  
V. Golub ◽  
Y. Trygub
Keyword(s):  
Statistical Models ◽  
Operational Reliability ◽  
Technical Condition ◽  
Statistical Information ◽  
Current Level ◽  
Flight Safety ◽  
Combined Operations ◽  
Military Aviation ◽  
Engine System ◽  
Mathematical Processing

On the example of helicopters, the topical issues of systematization and mathematical processing of statistical information taking from fault log sheetsto assess the level of reliability and flight safety of state aviation equipment are considered. The reliability of all helicopter systems must meet the pressing needs of defense capabilities and support the capabilities of the state aviation of Ukraine to carry out combat missions at the current level. Improving preparedness for assigned tasks will facilitate participation in combined operations with peacekeeping and NATO forces. The considered model of the system of aviation equipment on the example of helicopters consists of interdependent, jointly functioning, united by a single purpose of five subsystems of the corresponding type of specialty: “helicopter and engine”, “aircraft armament”,“aircraftequipment”, “avionics equipment”,“navigation and target acquisition system”. Realization and methodical approaches to the development of complex failuremodels of the elements of “helicopter and engine” system by types of helicopters are substantiated. The paper proposes to address on the example of helicopters the lines of approach the problem of assessing the real level of operational reliability and flight safety of aircraft to maintain their serviceable condition. When putting military aviation assets into operation according to the technical condition, using statistical models of reliability and flight safety, the important task of increasing resource indicators is solved, which requires improving the system of collecting, processing and analyzing information from fault log sheets.

scholarly journals THE CONCEPT OF EVALUATION OF MAXIMUM ACCEPTABLE RELIABILITY FACTORS OF STATE AVIATION HELICOPTERS

2021 ◽  
pp. 17-24
Author(s):  
V. Boiarov ◽  
А. Bursala ◽  
V. Golub ◽  
M. Zhdaniuk ◽  
O. Cherednikov
Keyword(s):  
Operational Reliability ◽  
Technical Condition ◽  
Flight Safety ◽  
Traffic Light ◽  
Conceptual Approach ◽  
Combined Model ◽  
Reliability Factor ◽  
Limit Values ◽  
The Military ◽  
Acceptable Reliability

The aim of the study is to develop and determine the maximum acceptable reliability factor of state aviation helicopters based on statistics on malfunctions that occur during the operation of the aviation materiel, taking into account the recommendations of ICAO. The paper defines the general criteria for calculating the limit values of reliability (operational reliability and flight safety). For their implementation it is necessary: to carry out constant monitoring of flight safety and the general reasons which cause emergence of malfunctions of helicopters, their systems and subsystems; to use the proposed combined model on the principle of "traffic light" to determine the level of flight safety indicators at their standard deviation when justifying decisions on the forecast for future periods of operation and establishing certain values of forecast indicators of the "upper control limit" of operational Based on the adopted conceptual approach to determining the dynamics of change in failure rates, quantitative criteria are developed. Proposals to determine the indicators of the technical condition during the military operation of the aircraft will maintain high combat readiness of state aviation at a given level, predict the need for maintenance and repair and predict the timing and direction of modernization of aircraft.

Assessment of technical condition of high-voltage overhead power transmission lines at the stage of their ageing

2021 ◽  
Vol 14 (2) ◽  
pp. 100-107
Author(s):  
E. M. Farhadzadeh ◽  
A. Z. Muradalyiev ◽  
S. A. Muradalyiev ◽  
A. A. Nazarov
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Transmission Lines ◽  
Power Transmission ◽  
Operational Reliability ◽  
Technical Condition ◽  
Weak Links ◽  
Power Transmission Lines ◽  
Nonlinear Growth ◽  
Overhead Power Transmission Lines

The organization of operation, maintenance and repair of the basic technological facilities of electric power systems (EPS), which are beyond their designed service life (hereinafter referred to as ageing facilities, or AFs) is one of the problems that determine the energy security of many countries, including economically developed nations. The principal cause of insufficient overall performance of AFs is the traditional focus of the EPS management on economic efficiency and the insufficient attention to reliability and safety of AFs. The tendency to nonlinear growth in the frequency of occurrence of unacceptable consequences in the EPS requires ensuring the operational reliability and safety of AFs. The averaged estimates of reliability and safety used at designing power facilities are not suitable for characterization of overall operational performance. Among the basic and the least investigated (in terms of operational reliability and safety) EPS facilities are overhead power transmission lines (OPL) with a voltage of 110 кV and above. This is for a reason. OPL are electric power facilities with elements distributed along a multi-kilometer line (supports, insulators, wires, accessories, etc.). That is what makes the organization of continuous monitoring of the technical condition of each of these elements, and, consequently, the assessment of operational reliability and safety, so problematic. A method is suggested for assessment of “weak links” among the operated OPL on operative intervals of time along with a method for assessment of the technical condition of OPL at examination of a representative sample.

scholarly journals The method for increasing the efficiency of equipment’s maintenance in railway traction power supply systems

2018 ◽  
Vol 47 (3) ◽  
pp. 39-47 ◽  
Author(s):  
Oleksandr Matusevych ◽  
Valeriy Kuznetsov ◽  
Viktor SYCHENKO
Keyword(s):  
Power Supply ◽  
Operational Reliability ◽  
Technical Condition ◽  
Repair System ◽  
Maintenance And Repair ◽  
Traction Substations ◽  
Electric Equipment ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

Purpose. To develop the method for increasing the efficiency of the equipment’s maintenance and repair system, ensuring necessary level of operational reliability of the equipment, safety and reliability of the electric equipment with minimal expenses on operation. Relevance. Aging of the power equipment in railway power supply systems sharply raised a need for assessment of its states and degree of risk for operation outside rated service life. In critical conditions of technological processes and operational modes of the railways it is necessary to increase the equipment’s operational reliability. The scheduled maintenance and repair system whose main technical and economic criterion is the minimum of equipment’s downtimes on the basis of a rigid regulation of repair cycles, in the conditions of market regulations in the field of repair in many cases does not provide the optimal decisions due to insufficient financing. The solution of this problem is possible by improvement of the maintenance and repair system. Under these conditions the main direction for supporting the operational reliability of power electric equipment on TS is a development of the modern methods based on individual supervision over real changes of technical condition of power equipment. Scientific novelty. In this article the authors proposed an integrated approach, on the basis of which can be developed the effective maintenance and repair system for traction power supply systems. Proposed approach allowed to react quickly to changes of service conditions on traction substations, to control the technical condition of power electric equipment under the conditions of uncertainty, to establish interrelation between quality of service and operational reliability of the equipment, to choose a service strategy on traction substations. Practical importance. The validity of the developed method was confirmed by the results of calculations and practically by choosing the optimal maintenance's option for transformer TDTN-25000/150-70 U1 (ТДТН-25000/150-70 У1) on traction power supply substation.

scholarly journals Improving The Accuracy Of Selection Of Bird Radar Echoes Against A Background Of Atomized Clouds And Atmospheric Inhomogeneities

The Ring ◽  
2015 ◽  
Vol 37 (1) ◽  
pp. 3-18
Author(s):  
Leonid Dinevich
Keyword(s):  
Bird Migration ◽  
Meteorological Conditions ◽  
Flight Safety ◽  
Selection Algorithm ◽  
Radar Echoes ◽  
Military Aviation ◽  
Radar Echo ◽  
Reflected Signal ◽  
Selection Of ◽  
Polarization Fluctuation

Abstract The algorithm for bird radar echo selection was developed in Israel and has been successfully used for many years to monitor birds in periods of massive intercontinental migration in order to ensure flight safety in civil and military aviation. However, it has been found that under certain meteorological conditions the bird echo selection algorithm does not filter out false signals formed by atomized clouds and atmospheric inhomogeneities. Although the algorithm is designed to identify and sift false signals, some useful echoes from smaller birds are erroneously sifted as well. This paper presents some additional features of radar echoes reflected from atmospheric formations that can be taken into account to prevent the loss of useful bird echoes. These additional features are based on the use of polarization, fluctuation and Doppler characteristics of a reflected signal. By taking these features into account we can reduce the number of false signals and increase the accuracy of the bird echo selection algorithm. The paper presents methods for using radar echoes to identify species and sizes of birds, together with recommendations on using the data to ensure flight safety during periods of massive intercontinental bird migration.

Assessment of the technical condition of mines with mechanical fuses

2021 ◽  
Vol 2021 (1) ◽  
pp. 1-12
Author(s):  
Adam Kubecki ◽  
Cezary Śliwiński ◽  
Janusz Śliwiński ◽  
Ireneusz Lubach ◽  
Leszek Bogdan ◽  
...  
Keyword(s):  
Construction Materials ◽  
Armed Forces ◽  
Operational Reliability ◽  
Strength Properties ◽  
Technical Condition ◽  
Armed Conflicts ◽  
Long Term Storage ◽  
Precise Adjustment ◽  
Main Charge ◽  
Materials Used

Contemporary armed conflicts reveal that the use of effective mine barriers has a significant impact on the course of hostilities. Therefore, the Polish Armed Forces selected reliable and effective explosive ordnance as a priority, both newly-acquired material and those currently in operation. For this reason, among others, strict supervision over the technical condition of mines is exercised, in particular during their long-term storage. The reasons behind the increased mine unreliability may include physical and chemical changes in the construction materials used (corrosion, deformations, loss of strength properties), deterioration of the physicochemical properties of the main charge, booster and primer-detonator, inadequate technical condition of the safety components, or the failure of mine fuse mechanisms. In order to assess the mine's operational reliability, each mine fuse subassembly is examined and then a check of the entire assembled mine is performed. This requires proper planning of the full test cycle and the use of inspected and calibrated measuring devices and test stands enabling the precise adjustment of mechanical and climatic stress parameters.

scholarly journals Geotechnical and ecological foundations of the sustainable life cycle of the long-operated unique underground structures of the water disposal system in difficult ground conditions

2019 ◽  
Vol 265 ◽  
pp. 05002
Author(s):  
Nicolay Perminov
Keyword(s):  
Life Cycle ◽  
Operational Reliability ◽  
Technical Condition ◽  
Simultaneous Increase ◽  
Underground Structures ◽  
Joint Work ◽  
Soil System ◽  
Ground Conditions ◽  
Condition Modeling ◽  
Water Disposal

Intensive development of megacities causes the need for sustainable operation of underground urban infrastructure facilities. In the special protection against man-made impact, long-operated unique underground structures of the water disposal system, which are related to facilities with an increased level of responsibility and danger, are needed. In the report, based on the experience of studying the operation of underground wastewater facilities in conditions of weak soils and intensive external static and dynamic impacts, there are proposed new methods for diagnosing their technical condition, modeling and monitoring of the joint work of the "underground structures aggregate of soil" system are implemented, forecasting and shaping conditions for its sustainable life cycle. Point and linear objects of the water canal of St. Petersburg are developed and implemented at unique (to a depth of 70 m.) geotechnology, providing simultaneous increase of bearing capacity, operational reliability and ecological safety of longoperated underground drainage facilities in difficult ground conditions with increasing man-caused impacts.

Culture and Flight Safety in Military Aviation

2000 ◽  
Vol 10 (2) ◽  
pp. 111-133 ◽  
Author(s):  
Joseph L. Soeters ◽  
Peter C. Boer
Keyword(s):  
Flight Safety ◽  
Military Aviation

scholarly journals Command-methodological competence of cadets-military pilots as a factor of flight safety

2021 ◽  
Vol 27 (4) ◽  
pp. 85-91
Author(s):  
A. I. Savelev
Keyword(s):  
Air Force ◽  
Professional Training ◽  
Cognitive Activity ◽  
Research Centre ◽  
Professional Activity ◽  
Flight Safety ◽  
Leading Role ◽  
Military Aviation ◽  
Military Pilots ◽  
The Military

The military professional training of cadets-military pilots in a military aviation university is conditioned by the trends in the development of military education, its prompt response to the personnel needs of the troops. Aviation units need military pilots who are ready to fulfill the official duties of crew commanders, to solve the urgent task of ensuring flight safety. Training of flight personnel for military aviation does not fully take into account the need to form cadets' competencies as an aviation commander and teacher, which will contribute to ensuring flight safety and increasing the combat potential of aviation units and subunits. The article deals with the problem of flight safety as a factor affecting the national security of Russia, paying attention to the causes of accidents and pilot errors. In the course of the study, it was proved that the military-professional activity of cadets-military pilots is the process of solving professional tasks that ensure the combat readiness of aviation units while observing flight safety conditions. Based on the content analysis of the command and methodological professional tasks based on the activity approach, the leading role of the command-methodological activity has been established. The functional approach and the principle of identification made it possible to identify the functions of the leading command-methodological activity (military flight training and educational, organizational and managerial). Arguments are given regarding the development of cadets not only a set of abilities for command-methodological activity, but also professionally important qualities that integrate command-methodological competence. The structure of competence (motivational-value, cognitive, activity components) is determined taking into account the specifics (leading type of activity) and features (a set of command and methodological professional tasks) of military professional activity. The criteria for the formation of the components of the command-methodical competence (professional purposefulness, intellectual potential, professional responsibility) have been identified. The methodological basis of the pedagogical system for the formation of the command-methodical competence of cadets-military pilots was formed by the system-structural, personality-activity, functional, modular, adaptive, technological and competence-based approaches. The results of the experimental work carried out in the branch of Military Educational-Research Centre of Air Force Air Force Academy in Syzran confirmed the dependence of the cadets' readiness for flight safety activities on the formation of command-methodological competence.

scholarly journals And probabilistic model to calculate on-the-dejnosti nodes and interfaces of the manipulator

2017 ◽  
Author(s):  
Н.А. Сидоренков ◽  
Б.Г. Мартынов
Keyword(s):  
Service Life ◽  
Operational Reliability ◽  
Technical Condition ◽  
Optimal Frequency ◽  
Maintenance And Repair ◽  
Reliability Models ◽  
Warranty Period ◽  
Hydraulic Manipulators ◽  
Statistical Studies ◽  
Proactive Maintenance

Во время эксплуатации гидроманипуляторов (ГМ) возникает задача продления жизненного цикла ГМ. В настоящее время он составляет при полной нагрузке ГМ от 3 до 5 лет или 6000 моточасов до капитального ремонта. В зависимости от условий работы и обслуживания этот ресурс, по данным ПО «Подъемные машины», может быть израсходован за 8 мес. Руководством по эксплуатации ГМ определены пять видов ТО: ЕТО и четыре номерных. Причем в гарантийных обязательствах определен период работы ГМ до первого отказа. Он соответствует примерно 120 моточасам. Для продления срока службы ГМ до капитального ремонта необходимо перейти от обычной планово-предупредительной системы ТО и ремонта к проактивной системе. Основу проактивной системы ТО и Р составляет правильное управление техническим состоянием механизма с целью повышения его эксплуатационной надежности, определения оптимальной периодичности ТО и Р, что в свою очередь требует полной информации о техническом состоянии механизма и надежности его узлов и сопряжений. Цель проактивной системы ТО и Р – предупреждать отказ узлов и сопряжений механизма. Для реализации этой цели необходима разработка модели надежности ГМ и проведение статистических исследований отказов элементов механизма. Поэтому данная задача является актуальной. В настоящей статье приводится выражение, которое позволит формировать стратегию обслуживания данного типа манипуляторов для продления их срока службы. Цель исследования – разработка вероятностной модели надежности узлов и сопряжений ГМ для решения одной из задач управления техническим состоянием механизма с целью обоснования проактивной системы ТО и Р. During operation of hydraulic manipulators (GM), there arises the problem of extending the life cycle of the GM. Currently, it is under full load UM from 3 to 5 years or 6000 hours before overhaul. Depending on the conditions of operation and maintenance of this resource, according to «Lifting machines», can be used for 8 months. The user manual for the GM identifies five kinds: UTB and four plates. And in a warranty period defined by the work of the GM until the first failure. It corresponds to about 120 hours. To extend the service life of the GM overhaul need to move from conventional preventive system of maintenance and repair to a proactive system. The basis for proactive maintenance and R is the correct management of the technical condition of the mechanism with the purpose of increasing its ex-operational reliability, determining the optimal frequency and R, which in turn requires full information about the technical condition of the mechanism and reliability of its components and interfaces. The purpose of proactive maintenance and repair – to prevent failure of the nodes and interfaces of the mechanism. To achieve this goal it is necessary to develop reliability models of the GM and carrying out statistical studies of failures of elements of the mechanism. Therefore, this task is urgent. In this paper, we provide an expression that will form the servicing strategy for this type of manipulators to extend their service life. The purpose of the study: the development of probabilistic reliability models of the nodes and interfaces of GM to address one of the problems of control of technical condition of the mechanism in order to justify the proactive maintenance and R.

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