Cyclic Indentation Method Applied to Evaluating Surface Degradation of Cylinder-Piston Group Parts

2021 ◽  
Author(s):  
J. Wang ◽  
H. Li ◽  
K. Grinkevych ◽  
R. Huang ◽  
J. Xu ◽  
...  
Keyword(s):  
Indentation Method ◽  
Surface Degradation ◽  
Piston Group ◽  
Cyclic Indentation ◽  
Cylinder Piston

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 REDUCING TEMPERATURE OF CYLINDER LINER DUE TO APPLICATION OF HEAT CARRIER WITH HIGH-CONDUCTIVE MULTIGRAPHENE NANOPARTICLES

2019 ◽  
pp. 56-62
Author(s):  
Roman Vladimirovich Gorshkov
Keyword(s):  
Heat Transfer ◽  
Base Fluid ◽  
Cooling System ◽  
Solid Phase ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Heat Conducting ◽  
Piston Group ◽  
Cylinder Piston ◽  
Cooling Cavity

The paper considers one of the promising ways to influence the heat transfer in the cooling system of a cylinder-piston group, which is to improve physical properties of coolants. It has been stated that the development of nanotechnology has recently made it possible to significantly increase the thermal conductivity coefficient of base coolant - an aqueous solution of ethylene glycol due to its modification by high-conductive solid multigraphene nanoparticles. The resulting stable two-phase suspensions based on the base coolant and particles of the solid phase are called nanofluids. To evaluate the increase in heat transfer at the “wall-coolant” boundary and the decrease of temperature of this wall when applying nanofluid in the engine cooling system as compared to the base fluid, an experimental setup was developed for simulating the flow of coolant in the annular channel of the cooling cavity of the cylinder liner and the conditions determining the heat transfer in its cooling cavity. As a result of conducting a series of experiments under similar test conditions, a significant increase in the heat transfer coefficient was found at the boundary of the “liner wall-liquid” due to the use of nanofluids with highly heat-conducting multigraphene nanoparticles compared to the base fluid. This led to a decrease in the temperature of the cylinder liner. Reducing the temperature of the heat-loaded engine parts allows to increase the reliability of the promising and forced diesel engines, to increase the degree of boosting at the average effective pressure while maintaining the permissible temperature level of the parts of the cylinder-piston group. Intensification of heat transfer at the “wall-liquid” interface contributes to an increase in the thermal efficiency of various heat exchangers as part of an internal combustion engine associated with the main circuit of the cooling system.

scholarly journals Selection of Parameters for Diagnostics of Parts of Cylinder-piston Group of Automotive Diesel Engines

2020 ◽  
Author(s):  
Б.С. Антропов ◽  
В.В. Капралов ◽  
В.В. Гумённый ◽  
В.А. Генералов
Keyword(s):  
Service Life ◽  
Information Value ◽  
Dust Particles ◽  
Inertial Forces ◽  
Oil Consumption ◽  
Automotive Engines ◽  
Piston Group ◽  
Cylinder Piston ◽  
Quality Check ◽  
Selection Of

Детали цилиндропоршневой группы (ЦПГ) определяют ресурс автомобильных двигателей, так как они являются наиболее нагруженными газовыми и инерционными силами, имеющими переменный и знакопеременный характер изменения. К тому же эти детали имеют контакт с горячими газами и атмосферным воздухом, содержащим абразивные частицы пыли, что интенсифицирует их износ. Достоверность диагностирования состояния деталей ЦПГ зависит от информативности выбранных параметров, которыми являются показатели качества работы двигателей. Проверка двигателей из эксплуатации с пробегами, близкими к их ресурсу, на тормозном стенде при работе на номинальном режиме, показала, что самым информативным является расход масла на долив (на угар). Он рекомендован как основной диагностический параметр деталей ЦПГ. Вспомогательными параметрами рекомендуются компрессия и расход картерных газов, которые целесообразно использовать при углублённом диагностировании указанных деталей с целью определения неисправных цилиндров двигателя. Parts of cylinder-piston group determine service life of automotive engines as they are the most loaded gas and inertial forces, having variable and sign-alternating character of change. In addition, these parts have contact with hot gases and atmospheric air containing abrasive dust particles which intensifies their wear. Reliability of diagnostics of CPG parts condition depends on information value of selected parameters which are indicators of engines operation quality. Check of engines out of service with runs close to their service life on the brake stand bench during operation at nominal conditions has showed that the most informative is oil consumption through burning. It is recommended as the main diagnostic parameter of CPG parts. The auxiliary parameters are recommended compression and flow rate of crankcase gases which are useful for deep diagnostics of the specified parts in order to determine faulty cylinders of the engine.

scholarly journals Research and development of commercially viable lubricants to intensify working life of marine diesel engines and cylinder piston group in internal combustion engines

2021 ◽  
Vol 2021 (4) ◽  
pp. 62-74
Author(s):  
Vasiliy Aleksandrovich Chanchikov ◽  
Ivan Nikolaevich Guzhvenko ◽  
Alexandr Ivanovich Andreev ◽  
Marina Aleksandrovna Shulimova ◽  
Sergey Aleksandrovich Svekolnykov
Keyword(s):  
Diesel Engines ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Mechanical Mixing ◽  
Friction Modifier ◽  
Marine Engine ◽  
Piston Group ◽  
Molybdenum Diselenide ◽  
Marine Diesel ◽  
Cylinder Piston

The paper presents the results of studying the influence of variable characteristics of lubricating oils for marine diesel engines (concentration of layered friction modifier in lubricating oil, viscosity of lubricating oil, contact pressure in the friction zone) on the tribological parameters of parts of the cylinder-piston group of marine diesel engines. There are considered the aspects of increasing the reliability and wear resistance of the cylinder-piston group of marine diesel engines when a layered friction modifier is added to the base lubricating oil in a concentration of 1.5 vol.%. There have been carried out the comparative tribological studies of M-16G2CS lubricating oil including an additive based on molybdenum diselenide. Dependences of the wear of parts of the cylinder-piston group of a marine engine on different parameters of the studied lubricants are shown. The wear rate of experimental samples in conditions of variable characteristics of lubricants has been studied. According to the tribological studies of lubricants and structural materials, the tribological rating of lubricating compositions containing M16G2CS marine engine oil as a base and a layered friction modifier - molybdenum diselenide as a tribologically active additive was built. The test tool for the antiwear ability of lubricants is a friction machine of an original design with abraded samples according to the “ball-cylinder” contact scheme. Mechanical mixing of the lubricating medium of “oil + additive” type on the RPU-0.8-55A rotary-pulsating unit was one of the variable parameters in the tests. The tribological efficiency of the studied antiwear additive varies depending on the type of mixing of the additive solution before adding to the base lubricating oil and makes 13-54% (the difference in the diameter of the wear spot of the sample) for mechanical mixing, and for rotary-pulsation mixing - 45-56%.

Automated Diagnostic System for Engine Cylinder-Piston Group

2020 ◽  
Author(s):  
Olexii Saraiev ◽  
Iryna Saraieva ◽  
Igor V. Gritsuk ◽  
Vladimir Volkov ◽  
Oleksandra Litikova ◽  
...  
Keyword(s):  
Diagnostic System ◽  
Piston Group ◽  
Engine Cylinder ◽  
Cylinder Piston

Expert assessment of the technical condition of the cylinder-piston group of the car engine

2021 ◽  
Vol 13 (1) ◽  
pp. 133-139
Author(s):  
Iryna Sarayevа ◽  
◽  
Alexander Khrulev ◽  
Oleksandr Vorobiov ◽  
◽  
...  
Keyword(s):  
Structural Parameters ◽  
Random Variable ◽  
Technical Condition ◽  
Expert Assessment ◽  
Diagnostic Parameter ◽  
Average Value ◽  
Piston Group ◽  
Cylinder Piston ◽  
The Difference ◽  
Relative Change

Informative dampers and installation methods do not dose the speed, accurately distinguish the nature of the injustice of the cylinder-piston group and check the tightness of the valves of the single-stage model of the engine, which allows a preliminary quality assessment in the production assessment. . During the inspection, the activity of the "black box" is checked for unknown structural elements, the initial diagnostic obligations that affect. The nomenclature of structural parameters that are checked is determined in accordance with existing standards. Based on the advanced model development method produced by the technical condition of the cylinder-piston group and the sealed valve of the engine, model, detailed dosing, statistical information, machines, machines, machines, machines, machines, machines, machines, machines and equipment. first, to localize the unevenness of the cylinder-piston group and the tightness of the engine valve, and secondly, to formally process the process of automated technical diagnosis; thirdly, it will provide a high rate of indiscriminate diagnosis. To assess the sensitivity of the diagnostic value as a random variable, it is proposed to evaluate not the relative change in the limit and nominal value of the controller, the relative change in the average value of the random variable within the allowable value. The diagnostic parameter is considered stable if the condition under which the absolute maximum value from the average value does not exceed "three sigma" is fulfilled. Informative in consideration is the diagnostic parameter in which the ratio of the difference between the average significant value of the random control in good and faulty state of the object to the difference of standard deviations exceeds one. Expert assessment of the technical condition of the road vehicle is associated with the determination of diagnostic parameters, structural parameters, as well as the reasons that caused the change of these parameters.

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