scholarly journals USING OF THE MATHEMATICAL APPARATUS REGRESSION ANALYSIS TO UNIFY THE CALCULATING METHODOLOGY FOR THE T-64B TANK'S OVERHAUL LIFE

2021 ◽  
Vol 5 (3) ◽  
pp. 151-157
Author(s):  
Helen Makogon ◽  
Volodymyr Chalapko ◽  
Serhiy Guba ◽  
Vladyslav Staryshenko ◽  
Viktor Moskalenko ◽  
...  
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Training Group ◽  
Regression Equation ◽  
Operating Conditions ◽  
Analytical Dependence ◽  
Normal Operation ◽  
Mathematical Apparatus ◽  
Repair Service ◽  
Combat Training

The subject matter of the article is the life cycle of a T-64B tank sample during the period from normal operation in a combat training group to resource consumption and carrying out average and capital repairs. The goal of the study is to develop a model of dependence of inter-repair service life of the T-64B tank sample on the machine operating conditions and, on its basis, a methodology for controlling the parameters of individual assemblies and systems of the tank sample during its life cycle. The tasks to be solved are: to analyze the results of statistical records of tank system failures and damages number and identify the predicates set affect the inter-repair service life of the machine depending on conditions of its tasks for the intended purposes; to create the regression equation for getting the unified analytical dependence of inter-repair service life of the T-64B tank sample in the period from normal operation in training and combat group to service life and overhaul; to investigate specific influence of reliability indices on the machine's service life. General scientific and special methods of scientific knowledge are used. The method of hierarchy analysis, mathematical apparatus of probability theory and multidimensional statistical analysis were used. The following results are obtained. A set of predicates influence the inter-repair service life of the machine depending on conditions of its tasks for the intended purposes fulfillment has been determined. A regression equation has been drawn up to obtain a unified analytical dependence of the overhaul life of a T-64B tank sample during the period from normal operation in a combat training group to the development of a resource and carrying out of intermediate and complete overhauls were drawn up. Engineering solutions have been proposed to implement a methodology for monitoring the parameters of individual units and systems of the tank sample during its life cycle, namely integrated real-time monitoring of oil condition and recording of engine operating hours under various load conditions. Conclusions. The space of features characterizes the conditions of the tank sample tasks for its intended purposes, includes service life, crew training, operation, seasonality of the unit’s performed tasks nature, machine  operating time since the last service and range of the vehicle before the next overhaul. The analytical relationship between the individual factors determining the conditions under which the T-64B tank sample performs its tasks for the intended purposes and the machine's service life consumption as a dependent variable can be determined in the form of a regression equation. Differentiated control of the parameters of individual assembly units and systems of the tank sample plays a leading role in ensuring the combat readiness and efficiency of the use of aging samples of weapons, insures personnel against possible accidents and catastrophes, sudden failures.

scholarly journals Methodical approach to forecasting costs for updating and using arms and military equipment park

2021 ◽  
pp. 37-45
Author(s):  
Oleksii Leontiev ◽  
Maryna Naumenko
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Failure Rate ◽  
Methodological Approach ◽  
Operating Conditions ◽  
Operating Costs ◽  
Residual Service Life ◽  
Purchase Price ◽  
Military Equipment ◽  
The Cost

A methodological approach to forecasting the cost costs at the main stages of the life cycle of a sample of weapons and military equipment, as one of the most important carriers of the capabilities of military organizational-staff formations, is proposed, which is carried out when substantiating measures for developing the capabilities of troops in the course of long-term and medium-term defense planning. The methodological approach is based on the use of the concept of a typical distribution of the cost of the life cycle of a sample by stages and stages, which allows in a formalized form to link costs at each stage of the purchase price of a serial product of a sample of weapons and military equipment of a specific type and type, taking into account the choice of a specific way of obtaining weapons and military equipment. It is proposed to forecast the volume of necessary costs at the stage of operation and support, taking into account the uneven distribution of these costs during this stage of the life cycle of a separate product. For this, it is proposed to divide the entire period of the duration of the operation stage into two main parts. The first part corresponds to the operating conditions of the product with a constant failure rate of the equipment after the completion of a short running-in process, and the operating costs per unit of time on it are considered the same throughout its duration. A formalized expression is proposed for obtaining the predicted value of these costs depending on the purchase price of the product. In the second part of the period of operation and support of a product of weapons and military equipment, operating costs per unit of time change over time according to an exponential law, reflecting the fact that operating costs increase with an increase in the failure rate as it approaches the assigned service life, which corresponds to the laws, known from the general theory of reliability of technology. The specifics of forecasting the costs of operation and support of a product obtained by import and which has already been in operation and has a residual service life have been determined.

scholarly journals MODEL OF AN ESTIMATION OF A RESOURCE OF TRACTION TRANSFER OF A MOTOR CARLOAD ROLLING STOCK

2015 ◽  
Vol 2 (158) ◽  
Author(s):  
Aleksandr Babanin ◽  
Sergiy Yarovoy ◽  
Vadim Bulba
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Motor Block ◽  
Technical Condition ◽  
Normal Operation ◽  
Rolling Stock ◽  
Definition Of ◽  
Analytical Expressions

In clause questions of definition of a resource of the wheel motor block traction transfer of a motorcarload rolling stock are considered. Problems of forecasting of a technical condition of responsible units oftraction transfer are certain. The model of deterioration in which the periods extra earnings are allocated,normal operation, intensive deterioration and prolongation of service life of the wheel motor block of amotor carload rolling stock is formalized for weigh his life cycle. For each allocated period meetingdependences of speed and intensity of deterioration are offered. According to dependences calculations arelead and analytical expressions of wear of points of cog-wheels of power reducing of traction transfer whichallow to predict his resource in operation are received.

scholarly journals Estimating efficiency of forecasting technical conditions of ship propulsion systems

2021 ◽  
Vol 2021 (4) ◽  
pp. 27-33
Author(s):  
Guriy Alekseevich Kushner ◽  
Victor Andreevich Mamontov
Keyword(s):  
Service Life ◽  
Operating Conditions ◽  
Technical State ◽  
Extrapolation Method ◽  
Normal Operation ◽  
Propeller Shaft ◽  
Shaft Line ◽  
Operating Modes ◽  
Forecasting System ◽  
Vibration Parameters

The article considers an approach to assessing the effectiveness of the most common methods of predicting the technical conditions and failure with reference to the ship shafting. There have been analyzed the main factors in operation of the ship shaft line, which cause the change in its technical state. It has been found that a special feature of some loads acting on the propeller shaft is their stochastic or changing nature over time, which hampers predicting the technical state of the shafting and its units. The features of stochastic and extrapolation forecasting methods have been analyzed. The possibility of using statistical methods in conditions of mass standard production of shafting units with a relatively short regulated service life is estimated. An extrapolation method is proposed for predicting the maximum permissible clearance of stern tube bearings. The case of accumulating samples of measuring results of the propeller shaft sagging in the given time intervals is considered, the approximating functions are constructed. The criteria for the reliability of the results of extrapolation methods for predicting the wear of stern tube bearings are determined. There have been developed the proposals for adapting the causal method as an alternative to the extrapolation method. A schematic diagram of a system for the ship shafting failure predicting has been developed using the registration and analysis of vibration parameters, which serves as the basis for constructing a regression model of damage accumulation. The proposed forecasting system allows studying the actual operating conditions of the shafting, defining the actual external loads and the regularities of their occurrence, measuring deformations and stresses, and determining quantitative indicators of the reliability of the shafting during normal operation and special operating modes, for example, with vibration resonance. The theoretical basis of the algorithm for calculating and registering loads affecting the service life of shafts is proposed.

Effects of Pavement Condition on LCCA User Costs

2019 ◽  
Vol 2673 (5) ◽  
pp. 339-350 ◽  
Author(s):  
Egemen Okte ◽  
Imad L. Al-Qadi ◽  
Hasan Ozer
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
The United States ◽  
Operating Conditions ◽  
Work Zone ◽  
Operating Costs ◽  
Normal Operation ◽  
Normal Operating ◽  
User Costs

Life cycle cost analysis (LCCA) is one of the well-established methods to determine the cost-effective alternative between different transportation infrastructure projects. Life cycle cost of a roadway alternative consists of agency and user costs over an analysis period appropriately selected. Agency costs include initial construction costs, and maintenance and rehabilitation costs incurred within the analysis period. User costs incur when there is a work zone present and also during normal operating conditions. In traditional LCCA, adopted by many agencies around the United States, it is assumed that the difference in user cost between alternatives mainly arise from work zone costs. The costs that arise during normal operating conditions (mainly vehicle operating costs) are not dependent on project alternatives and thus are traditionally considered to be negligible. This paper introduces a methodology to test the sensitivity of vehicle operating costs to roughness and texture profile quantitatively and evaluate its contribution to LCCA calculations. It was hypothesized that even the slight changes in surface profile between various alternatives may result in different user costs between the alternatives. A case study is presented to illustrate the effect of user costs of normal operating conditions on LCCA analysis results. Case study showed that vehicle operating costs that arise during normal operation may greatly affect the results of LCCA and should be considered, especially for low-volume traffic projects.

scholarly journals Life Prediction of Battery Using a Neural Gaussian Process with Early Discharge Characteristics

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1087
Author(s):  
Aijun Yin ◽  
Zhibin Tan ◽  
Jian Tan
Keyword(s):  
Life Cycle ◽  
Gaussian Process ◽  
Early Discharge ◽  
Remaining Useful Life ◽  
Operating Conditions ◽  
Cycle Life ◽  
Normal Operation ◽  
Discharge Characteristics ◽  
Whole Life Cycle ◽  
Capacity Prediction

The state of health (SOH) prediction of lithium-ion batteries (LIBs) is of crucial importance for the normal operation of the battery system. In this paper, a new method for cycle life and full life cycle capacity prediction is proposed, which combines the early discharge characteristics with the neural Gaussian process (NGP) model. The cycle data sets of commercial LiFePO4(LFP)/graphite cells generated under different operating conditions are analyzed, and the power characteristic P is extracted from the voltage and current curves of the early cycles. A Pearson correlation analysis shows that there is a strong correlation between P and cycle life. Our model achieves 8.8% test error for predicting cycle life using degradation data for the 20th to 110th cycles. Based on the predicted cycle life, capacity degradation curves for the whole life cycle of the cells are predicted. In addition, the NGP method, combined with power characteristics, is compared with other classical methods for predicting the remaining useful life (RUL) of LIBs. The results demonstrate that the proposed prediction method of cycle life and capacity has better battery life and capacity prediction. This work highlights the use of early discharge characteristics to predict battery performance, and shows the application prospect in accelerating the development of electrode materials and optimizing battery management systems (BMS).

A new handbook on structural concrete service life assignment taking into account the operating environment impact in their life cycle

2020 ◽  
pp. 126-134
Author(s):  
Vyacheslav Falikman ◽  
◽  
Valentina Stepanova ◽  
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Operating Environment ◽  
Environment Impact ◽  
Structural Concrete ◽  
Concrete Service

В статье систематизированы основные критерии, необходимые для определения нормативных сроков эксплуатации бетонных и железобетонных конструкций, проведен анализ состояния отечественной и зарубежной нормативной базы в отношении требований к срокам службы железобетонных конструкций, рассмотрены основные нормативно-технические документы в области проектирования железобетонных конструкций зданий и сооружений по их жизнен-ному циклу. Описаны виды коррозионных повреждений железобетонных конструкций и определяющие их факторы, приведены согласованные на международном уровне модели долговечности для некоторых деградационных процессов. На основе проведенных работ подготовлены предложения по оценке коррозионного состояния эксплуатировавшихся железобетонных конструкций, их остаточной несущей способности, эксплуатационной пригодности, ожидаемого срока службы в заданных агрессивных условиях и методов определения нормативных сроков службы железобетонных конструкций. Даны предложения по разработке и актуализации ряда релевантных нормативных, технических и организационно-методических документов.

Viability of turbine blade material with a long service life

2019 ◽  
pp. 28-35
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
M. K. Chegurov
Keyword(s):  
Heat Treatment ◽  
Service Life ◽  
Yield Strength ◽  
Mechanical Characteristics ◽  
Operating Time ◽  
Structural Features ◽  
Operating Conditions ◽  
Standard Methods ◽  
Experimental Values ◽  
Plasticity Coefficient

This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the 4th stage of turbine GTE-45-3 with an operating time of 13,000 to 100,000 hours. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, non-standard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole.

scholarly journals Predicting the influence of the non-sinusoidal network mode on power transformers

2019 ◽  
Vol 114 ◽  
pp. 04005
Author(s):  
Ngo Van Cuong ◽  
Lidiia I. Kovernikova
Keyword(s):  
Service Life ◽  
Electric Power ◽  
Power Quality ◽  
Electrical Equipment ◽  
Operating Conditions ◽  
Transformer Oil ◽  
Power Transformers ◽  
Electrical Network ◽  
Electrical Networks ◽  
Current Harmonics

The parameters of electrical network modes often do not meet the requirements of Russian GOST 32144-2013 and the guidelines of Vietnam. In the actual operating conditions while there is the non-sinusoidal mode in electrical networks voltage and current harmonics are present. Harmonics result in overheating and damage of power transformers since they cause additional active power losses. Additional losses lead to the additional heat release, accelerating the process of insulating paper, transformer oil and magnetic structure deterioration consequently shortening the service life of a power transformer. In this regard there arises a need to develop certain scientific methods that would help demonstrate that low power quality, for instance could lead to a decrease in the electrical equipment service life. Currently we see a development of automated systems for continuous monitoring of power quality indices and mode parameters of electrical networks. These systems could be supplemented by characteristics calculating programs that give out a warning upon detection of the adverse influence of voltage and current harmonics on various electrical equipment of both electric power providers and electric power consumers. A software program presented in the article may be used to predict the influence of voltage and current harmonics on power transformers.

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