scholarly journals Methods of Diagnosing of the Parts Status of the Cylinder-Piston Group of Automotive-Tractor Engines under Operating Conditions

2020 ◽  
pp. 69-72
Author(s):  
Б.С. Антропов ◽  
В.В. Гумённый ◽  
А.А. Рудаков ◽  
В.А. Генералов
Keyword(s):  
Operating Conditions ◽  
Diagnostic Methods ◽  
Technical Equipment ◽  
Labor Costs ◽  
Maintenance And Repair ◽  
Operational Conditions ◽  
Piston Group ◽  
Cylinder Piston ◽  
Tractor Equipment

Приведены методы диагностирования состояния деталей цилиндропоршневой группы (ЦПГ) двигателей для использования их непосредственно в эксплуатационных условиях автотракторной техники. Методы просты и достоверны, разработаны на основе учёта комплекса внешних проявлений неисправностей указанных деталей, с минимальным использованием диагностических приборов. Разработанные методы могут быть использованы владельцами технических средств, не имеющими производственной базы для проведения технического обслуживания и ремонта автотракторной техники. Применение разработанных методов диагностирования позволит сократить материальные и трудовые затраты при устранении неисправностей деталей ЦПГ двигателей. Methods of diagnostics of parts status of cylinder-piston group (CPG) of engines for their use directly in operational conditions of motor-and-tractor equipment are presented. The methods are simple and reliable, developed on the basis of a complex of outward appearances of these component malfunctions with minimal use of diagnostic devices. The developed methods can be used by owners of technical equipment that do not have a production base for maintenance and repair of motor-and-tractor equipment. The use of the developed diagnostic methods will reduce material and labor costs when troubleshooting the parts of the CPG engines.

scholarly journals Методика для трибодиагностики судовых крейцкопфных дизелей на основе имитационного моделирования

2020 ◽  
Author(s):  
A.V. Golenishev ◽  
A.V. Nadezkin ◽  
M.E. Starchenko
Keyword(s):  
Diesel Engine ◽  
Simulation Model ◽  
Technical Condition ◽  
Operating Conditions ◽  
Marine Diesel Engine ◽  
Threshold Values ◽  
Piston Group ◽  
Marine Diesel ◽  
Cylinder Piston ◽  
Wear Products

Рассматриваются подходы по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующие переход объекта диагностирования судового крейцкопфного дизеля из одного технического состояния в другое. Показано, что существующие методики не учитывают индивидуальные особенности и техническое состояние деталей цилиндропоршневой группы. Предложено для решения задачи их трибодиагностики использовать разработанную имитационную модель, позволяющую провести моделирование процесса изнашивания цилиндровой втулки и поршневых колец судового дизеля и на основании полученных расчетов определить концентрацию продуктов износа поступивших в отработанное цилиндровое масло при различной скорости изнашивания трущихся деталей. Данные о фактической концентрации продуктов износа в отработанном цилиндровом масле в дальнейшем соотносятся с результатами моделирования, что позволяет оценить техническое состояние деталей цилиндропоршневой группы двигателя. Представлены результаты моделирования по определению пороговых значений концентрации продуктов износа в отработанном цилиндровом масле, характеризующее переход судового дизеля из исправного в несправное техническое состояние. Даны практические рекомендации по выбору пороговых значений содержания продуктов износа в отработанном цилиндровом масле для различных типов судовых крейцкопфных дизелей и условий их эксплуатации.The article examines approaches to determine the threshold values of the concentration of wear debris in used cylinder oil that characterize the transition of a ship crosshead diesel engine unit under test from one technical condition to another. It is shown that the existing methods do not take into account the individual characteristics and technical condition of the parts of the cylinder-piston group. To solve the problem of tribodiagnostics, it is proposed to use the developed simulation model, which allows modeling the wear process of the cylinder bushing and piston rings of a marine diesel engine and, based on the obtained results, determining the concentration of wear products issued in the used cylinder oil at different wear rates of the moving parts. The data on the actual concentration of wear products in the used cylinder oil are subsequently correlated with the simulation model results, which makes it possible to evaluate the technical condition of the parts of the engine cylinder-piston group. The article presents the results of modeling of threshold values determination of the concentration of wear products in used cylinder oil, that measure the transition of a marine diesel engine from a working condition to a malfunctioning technical condition. Practical recommendations are given on choosing threshold values for the concentration of wear products in used cylinder oil for various types of marine crosshead diesel engines and their operating conditions.

scholarly journals Justification of cooficients reqiered for correction of rates of detail needs for machine maintenance and repair

2020 ◽  
Vol 210 ◽  
pp. 08011
Author(s):  
Alexey Shisteev ◽  
Galina Buraeva ◽  
Petr Ilyin ◽  
Victoriya Kovalivnich ◽  
Sergey Agafov
Keyword(s):  
Spare Parts ◽  
Operating Conditions ◽  
Maintenance And Repair ◽  
Machine Maintenance ◽  
Tractor Equipment

When solving the problems of increasing the reliability of automotive and tractor equipment during the regular repair period, a problem of adjusting the norms of the need for spare parts appears. The lack of recommendations for their determination, depending on the operating conditions, determines the need to deepen the analysis, development and refinement of techniques in order to clarify and adjust the normalizing factors.

scholarly journals INCREASING OF THE INFORMATIVEVALUE OF AUTOMOBILE ENGINE DIAGNOSTICS BY MEANS OF TECHNICAL ENDOSCOPY

2018 ◽  
Vol 22 (1) ◽  
pp. 18-26
Author(s):  
E. V. Ageev ◽  
A. V. Shcherbakov ◽  
YU. G. Alekhin ◽  
S. A. Grаshcow
Keyword(s):  
Combustion Engine ◽  
Practical Importance ◽  
Technical Condition ◽  
Technical State ◽  
Design Parameters ◽  
Mutual Position ◽  
Labor Costs ◽  
Piston Group ◽  
Cylinder Piston ◽  
Technical Endoscopy

Car engine is the most complex and important unit of a car. A lot of technical, economic and environmental automobile performance depend on it. Therefore, the development of advanced methods for diagnosing the technical state of engine mechanisms and systems is of great practical importance. The most part and labor intensity of the total number of malfunctions accounts for the cylinder-piston group (GPG). The purpose of this work was to increase the informative value of the process of diagnosing the engines of VAZ front-wheel drive vehicles by using technical endoscopy. To obtain information about the level of technical condition, it is not advisable to disassemble a unit or assembly in a good operation condition, since, first, it is associated with considerable labor costs, and second, and what is important, each disassembly and change of the mutual position of the used parts leads to the reduction of the residual life by 30 - 40%. Using a technical endoscope to obtain information about the technical state of the GPG provides unique opportunities for visual diagnostics. Due to the use of a technical endoscope, it became for the first time possible to proceed while diagnosing internal combustion engine GPG to the evaluation of design parameters of the technical state, such as: the state of the hone net, grooves, scoring, scratches, which could only be performed before by automobile disassembly. In general, technical endoscopy increases the informative value of the process of cylinder-piston group diagnosing. The use of a technical endoscope reveals unique possibilities for an operative assessment of the technical condition of the object being diagnosed in order to shorten the time of detection and subsequent elimination of malfunctions.

scholarly journals Research of operational dependability of automotive engines

Dependability ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 22-27 ◽  
Author(s):  
Yu. V. Bazhenov ◽  
M. Yu. Bazhenov
Keyword(s):  
Technical Condition ◽  
Factors Affecting ◽  
Maintenance And Repair ◽  
Operational Conditions ◽  
Diagnostic Parameters ◽  
Common Causes ◽  
Operational Tests ◽  
Cylinder Piston ◽  
Scientific Substantiation ◽  
Engine Components

The problem of increasing the dependability of the engine, which is the most complex and expensive unit of an automotive vehicle, cannot be solved without objective and reliable information on the failures and malfunctions of its components, their causes, actual life, as well as the factors affecting such indicators in real operational conditions. Manufacturing factories do not always have such information, hence design deficiency failures associated with design and development flaws are among the most common causes of loss of engine operability.The aim of this paper is to study the engine operational dependability using the results of their maintenance and repair.The methods are based on operational tests of engines that yield the most complete and objective information on their dependability, as they were conducted in typical operational conditions of automobile operating companies in the course of vehicle maintenance and repair. The results of the studies processed with the standard Statistica 6.0 are represented in the form the statistical evaluations of the dependability of primary structural engine components (times to failure, changes in the probability of nofailure depending on the travelled distance). The analysis of the obtained information allows estimating the level of actual dependability of the engine, identifying design flaws, developing specific measures aiming to increase operational dependability. Information obtained during such tests is useful not only to the engine manufacturers, but to the operators as well, as it enables a scientific substantiation of the norms of operability. For the purpose of identification and localization in the process of maintenance and repair of specific engine malfunctions, the paper substantiates a set of diagnostic parameters and their standard values.Conclusions. The research allowed elaborating a set of diagnostic parameters for evaluation of the technical condition of primary engine systems (cylinder-piston group, crank and gas distributing mechanisms) that define and limit its dependability. The application of the findings in the automobile maintenance and repair processes enables a significant improvement of the engines’ operational dependability and reduction of the costs of ensuring their operability.

scholarly journals VIBRATION PROCESSES AND THEIR RELATIONSHIP WITH DEFECTS

2021 ◽  
Vol 11 (07) ◽  
pp. 81-86
Author(s):  
Fariz Qafarov Fariz Qafarov ◽  
Elnarə Səlimova Elnarə Səlimova ◽  
Aybəniz Əmirova Aybəniz Əmirova
Keyword(s):  
Turnaround Time ◽  
Operating Conditions ◽  
Diagnostic Methods ◽  
Vibration Diagnostics ◽  
Operational Conditions ◽  
Dynamic Forces ◽  
Diagnostic Signs ◽  
Machine Parts ◽  
Pumping Unit ◽  
Pumping Units

ABSTRACT The article is devoted to vibration diagnostics, an effective method for assessing the parameters of the mechanical state of centrifugal pumping units. The use of vibration diagnostics allows, due to early detection of malfunctions, to improve target operation, increase the turnaround time and reduce the likelihood of emergency destruction of pumping unit elements. Diagnostic signs of the presence of defects in various elements of the pumping unit are presented. During the development of diagnostic methods, the character stages of the development of injuries are selected. These stages are the formation of the injury, the accumulation of injuries, collapse, and so on. consists of stages. Dynamic forces are considered to be the main cause of vibration in machine parts. It is under the influence of dynamic forces that fatigue breaks down in machine parts. The use of vibrodiagnostics in machine parts allows to accurately assess the degree of damage to its individual nodes. This, in turn, leads to improved operating conditions. In conclusion, it should be noted that vibrodiagnostics not only detects malfunctions in machines, but also reveals the causes of its formation. Keywords: vibrodiagnostics, improvement of operational conditions, determination of defects, probability of emergency destruction, repair, assessment.

scholarly journals Method for diagnosing the ICE cylinder-piston group in the combustion chamber in the mode of cranking the engine crankshaft

2020 ◽  
Author(s):  
Alexandr Gritsenko ◽  
Vladimir Shepelev ◽  
Sergey Baryshnikov
Keyword(s):  
Combustion Chamber ◽  
Combustion Engine ◽  
Dynamic Change ◽  
Experimental Studies ◽  
Technical Condition ◽  
Diagnostic Methods ◽  
New Method ◽  
Diagnostic Efficiency ◽  
Piston Group ◽  
Cylinder Piston

Abstract To increase the diagnostic efficiency, significantly reduce the unproductive time, and mainly increase the reliability and accuracy, we propose a new method and tools implementing it - an oscillographic method for monitoring the pressure and phase parameters during the dynamic change in the operating parameters. The proposed work is aimed at improving the internal combustion engine (ICE) performance by timely diagnosing the cylinder-piston group (CPG) and its maintenance based on the diagnostic results. The scientific novelty of the work lies in the establishment of the interconnection of the CPG parameters obtained in the test modes of the ICE operation, allowing us to justify the diagnostic modes and their limiting values; the development of diagnostic methods and tools allowing us to justify the test modes for diagnosing the ICE CPG; the experimental data, which revealed that the instantaneous pressure signal in the combustion chamber is a sensitive diagnostic sign, which reflects the technical condition of the ICE CPG and its elements; the results of the experimental studies of diagnosing the ICE CPG in test modes. The results of the experimental work were compared with the results of theoretical modeling, the convergence between them was 97–99%. The production validation of the new method demonstrated the reliability within 0.92–0.97.

scholarly journals Исследование расхода масла автотракторными двигателями

2020 ◽  
Author(s):  
B.S. Antropov ◽  
V.V. Gumenniy ◽  
V.V. Kapralov ◽  
V.A. Generalov
Keyword(s):  
Free Market ◽  
Engine Oil ◽  
Motor Oil ◽  
Oil Consumption ◽  
Piston Cylinder ◽  
Piston Group ◽  
Crankcase Oil ◽  
Cylinder Piston ◽  
Tractor Equipment ◽  
Factory Standard

В условиях рыночной экономики автотранспорт является основным по перевозке грузов. К нему предъявляются серьёзные требования как по надёжности, так и по экономичности, в частности по расходу топлива и картерного масла двигателей. Рассмотрены вопросы по определению расхода масла двигателя. Установлено, что под расходом масла автотранспортных двигателей понимается его долив от замены до замены. Долив масла до нормы связан с угаром в процессе эксплуатации автотракторной техники. Установлено, что расход масла является величиной переменной, возрастающей по мере увеличения пробега двигателя, вследствие износа деталей цилиндропоршневой группы ДВС. Определено также, что при предельном расходе масла, составляющим тройное увеличение заводского норматива для новых двигателей (перед запуском их в эксплуатацию), эксплуатация должна быть прекращена по экономическим соображениям. Как правило, в данном случае на двигателях заменяются детали цилиндропоршневой группы (поршни, гильзы и поршневые кольца). Расход масла на долив используется и для диагностирования двигателей, а именно по его значению можно определить состояние деталей цилиндропоршневой группы. Авторами приведены методы углублённого диагностирования с целью определения цилиндров, имеющих неисправности.Under free market conditions motor transport is the main transport of goods. Serious requirements are applied to it both in terms of reliability and efficiency in particular for fuel consumption and crankcase oil for engines. The issues of determining the engine oil consumption are considered. It was also established that the consumption of motor oil is understood as topping it up from replacement to replacement. Topping up the oil to normal is associated with burning while in operation of motor-and-tractor equipment. It has been established that oil consumption is a variable increasing as the engine mileage increases due to the wear of parts of the cylinder-piston ICE group. It is determined that with a maximum oil consumption amounting to a triple increase in the factory standard for new engines (before putting them into operation) operating should be stopped for economic reasons. As a rule in this case parts of the cylinder-piston group (pistons, sleeves and piston rings) are replaced on the engines. Oil consumption for topping up is also used to diagnose engines, namely by its value it is possible to determine the condition of parts of the piston-cylinder group. The methods of in-depth diagnosis in order to identify cylinders with malfunctions are presented by the authors.

Impact of climatic conditions on the parameters of failure flow of military vehicles

2021 ◽  
pp. 095440702110202
Author(s):  
Nikolaj Dobrzinskij ◽  
Algimantas Fedaravicius ◽  
Kestutis Pilkauskas ◽  
Egidijus Slizys
Keyword(s):  
Climatic Factors ◽  
Armed Forces ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Technical Equipment ◽  
Factors Affecting ◽  
Military Vehicles ◽  
Equipment Reliability ◽  
Number Of Factors ◽  
The Impact

Relevance of the article is based on participation of armed forces in various operations and exercises, where reliability of machinery is one of the most important factors. Transportation of soldiers as well as completion of variety of tasks is ensured by properly functioning technical equipment. Reliability of military vehicles – armoured SISU E13TP Finnish built and HMMWV M1025 USA built were selected as the object of the article. Impact of climatic conditions on reliability of the vehicles exploited in southwestern part of the Atlantic continental forest area is researched by a case study of the vehicles exploitation under conditions of the climate of Lithuania. Reliability of military vehicles depends on a number of factors such as properties of the vehicles and external conditions of their operation. Their systems and mechanisms are influenced by a number of factors that cause different failures. Climatic conditions represent one of the factors of operating load which is directly dependent on the climate zone. Therefore, assessment of the reliability is started with the analysis of climatic factors affecting operating conditions of the vehicles. Relationship between the impact of climatic factors and failure flow of the vehicles is presented and discussed.

scholarly journals Evaluation of Salvage Logging Productivity and Costs in the Sensitive Forests of Bulgaria

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 309
Author(s):  
Stanimir Stoilov ◽  
Andrea R. Proto ◽  
Georgi Angelov ◽  
Salvatore F. Papandrea ◽  
Stelian Alexandru Borz
Keyword(s):  
Cycle Time ◽  
Operational Efficiency ◽  
Fixed Costs ◽  
Labor Costs ◽  
Salvage Logging ◽  
Operational Conditions ◽  
Work Cycle ◽  
Wet Snow ◽  
Productivity Rate ◽  
Steep Terrain

Steep terrain harvesting can only be implemented by a limited set of operational alternatives; therefore, it is important to be efficient in such conditions, in order to avoid incurring high costs. Harvesting abiotically-disturbed forests (salvage harvests caused by wet snow), which is becoming common these days, can significantly impact the operational efficiency of extraction operations. This study was implemented in order to evaluate the performance of truck-mounted uphill cable yarding operations in salvage logging deployed in coniferous stands. A time study was used to estimate the productivity and yarding costs, and predictive models were developed in order to relate the time consumption and productivity to the relevant operational factors, including the degree of wood damage. The average operational conditions were characterized by an extraction distance of 101 m and a lateral yarding distance of 18 m, resulting in a productivity rate of 20.1 m3 h−1. In response to different kind of delays, the productivity rate decreased to 12.8 m3 h−1. Under the prevailing conditions, lateral yarding accounted for 32% of the gross work cycle time, and for 50% of the delay-free work cycle time of the machine. Decreasing the lateral yarding distance and increasing the payload volume to the maximum capacity of the machine would eventually lead to a yarding productivity of close to 30 m3 per SMH (scheduled machine hour). The calculation of the gross costs of uphill yarding showed that the labor costs (35.7%) were slightly higher than the fixed costs (32.9%), and twice as high compared to the variable costs (17.7%). The remote control of the carriage, mechanical slack-pulling mechanisms, and radio-controlled chokers are just some of the improvements that would have led to increments in operational efficiency.

Study on Characteristics of the Linear Air-Conditioner Compressor at Varied Operating Conditions

2011 ◽  
Vol 201-203 ◽  
pp. 632-636 ◽  
Author(s):  
Jie Fei Xie ◽  
Xin Hua Li ◽  
Hong Zhang
Keyword(s):  
Engineering Application ◽  
Axial Direction ◽  
Operating Conditions ◽  
Air Conditioner ◽  
Design Development ◽  
Runge Kutta Method ◽  
Moving Body ◽  
Cylinder Piston ◽  
Compressor Performance ◽  
Intake Pressure

This paper mainly introduces a novel linear air conditioner compressor which is driven by the linear oscillatory motor with two divided moving body, of which the Cylinder-piston assembly presents symmetrical distribution along the axial direction. The compressor dynamics equations were built and solved numerically with the fourth order Runge-Kutta method. in the meantime, this paper emphatically analyzes the influence of those factors, such as the intake pressure, the exhaust pressure, the suction gas superheat, the cooling degree, on the compressor performance at varied operating conditions. These works shows that improving the suction gas pressure and reducing the exhuast pressure can help to increase the refrigeration capacity and energy efficiency ratio of the air conditioner compressor. Those analysis results provide theory foundation for design,development, and engineering application of this linear air-conditioner compressor.

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