Numerical simulation of the dynamic behaviour of resilient mounts for marine diesel engines

2015 ◽  
pp. 163-172
Keyword(s):  
Numerical Simulation ◽  
Diesel Engines ◽  
Dynamic Behaviour ◽  
Marine Diesel

scholarly journals The dynamic behaviour of Archimede’s Bridges: Numerical simulation and design implications

2010 ◽  
Vol 4 ◽  
pp. 91-98 ◽  
Author(s):  
Federico Perotti ◽  
Gianluca Barbella ◽  
Mariagrazia Di Pilato
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behaviour

Reliability Analysis of Great Lakes Marine Diesels: State of the Art and Current Modeling

1990 ◽  
Vol 27 (04) ◽  
pp. 237-249
Author(s):  
Anastassios N. Perakis ◽  
Bahadir Inozu
Keyword(s):  
Great Lakes ◽  
Diesel Engines ◽  
Failure Modes ◽  
State Of The Art ◽  
Relevant Literature ◽  
Fault Tree Analysis ◽  
Reliability Engineering ◽  
Marine Industry ◽  
Marine Diesel ◽  
Basic Concepts

Some essential steps for the application of reliability, availability, and maintainability (RAM) techniques to marine diesel engines are presented. The paper begins with a summary of the basic concepts of reliability engineering, followed by a survey of the relevant literature on RAM applications to the marine industry and to marine diesel engines in particular. Next, the results of an informal survey of the reliability, maintenance, and replacement practices of Great Lakes operators are presented. Finally, the first two steps for a RAM application, failure modes and effects analysis and fault tree analysis, are introduced and applied for a prototype Colt-Pielstick marine diesel engine.

Fuel Efficiency – Challenges and Innovations in Emulsified Fuel Technology

2015 ◽  
Author(s):  
Jerry Ng ◽  
Kaisa Honkanen
Keyword(s):  
Diesel Engines ◽  
Fuel Injection ◽  
Fuel Efficiency ◽  
Combustion Efficiency ◽  
Secondary Atomization ◽  
Emulsified Fuel ◽  
Main Challenge ◽  
Marine Diesel ◽  
Initial Fuel ◽  
Fuel Technology

Emulsified fuel technology has been developed since the early 1980’s to the improve combustion efficiency of marine diesel engines by creating a secondary atomization effect after the initial fuel injection. The main challenge is to measure the improved sfoc of ships accurately and reliably. This paper presents a proposed method to measure the sfoc accurately and reliably to the order of 1%. Electronic governor also poses new challenge to measuring the sfoc of ships burning emulsified fuel. Meanwhile, fuel types supplied to ship owners are of increased varying properties although still complying to ISO8217 standard. This paper describes the innovations in emulsified fuel technology that were developed to meet these challenges.

Increasing the durability of the coupling "crankshaft neck – bearing liner" by applying nanocomposite additives to the engine oils of marine medium-speed diesel engines

2021 ◽  
pp. 93-100
Author(s):  
Л.Б. Леонтьев ◽  
Н.П. Шапкин ◽  
А.Л. Леонтьев ◽  
В.Н. Макаров ◽  
А.В. Арон
Keyword(s):  
Wear Resistance ◽  
Diesel Engines ◽  
Operating Conditions ◽  
Inorganic Materials ◽  
Engine Oil ◽  
High Wear Resistance ◽  
Medium Speed ◽  
Marine Diesel ◽  
Optimal Material ◽  
Technical Operation

Повышение долговечности трибосопряжений судовых дизелей, определяющих их ресурс, представляет собой актуальнейшую проблему, обусловленную как безопасностью мореплавания, так и экономическими факторами. Основной причиной отказов коленчатых валов двигателей, определяющих необходимость капитального ремонта, является износ шеек. Решение проблемы повышения износостойкости и, соответственно, долговечности связано с применением трибоактивных присадок в смазку. Несмотря на глубокие и обстоятельные исследования в области применения органо-неорганических материалов для использования в качестве присадок в моторное масло для повышения долговечности трибоузлов осуществить выбор оптимального материала для конкретных условий практически невозможно, так как исследования выполнены для различных условий эксплуатации и по различным методикам. Цель работы – разработка триботехнической присадки к моторным маслам, обеспечивающей повышение надежности и эффективности технической эксплуатации судовыхсреднеоборотных дизелей путем формирования тонкопленочного металлокерамического покрытия на поверхностях трения стальных деталей трибоузлов, позволяющего получить оптимальный комплекс параметров материала износостойкого покрытия. В работе представлены исследования эксплуатационных свойств присадок в моторное масло 17 органо-неорганических триботехнических материалов 4 групп — природные и искусственные полимеры, из которых были изготовлены свыше 20 композиций и композитов. Установлено, что наиболее перспективным является использование нанокомпозитов на основе вермикулита, модифицированного кислотой, в качестве присадок в моторное масло, так как они обладают минимальными коэффициентом трения при граничной смазке (0,007–0,014) а также высокой износостойкостью стали 40Х и обеспечивают минимальную величину скорости изнашивания вкладыша подшипника, благодаря чему повышается ресурс трибосопряжения более, чем в 3 раза, и соответственно снижаются эксплуатационные расходы. Increasing the durability of the tribo-couplings of marine diesel engines, which determine their resource, is an urgent problem due to both the safety of navigation and economic factors. The main reason for engine crankshafts failures, which determine the need for major repairs, is the wear of the necks. The solution to the problem of increasing wear resistance and, accordingly, durability is associated with the use of triboactive additives in the lubricant. Despite in-depth and thorough research in the field of application of organo-inorganic materials for use as additives in engine oil to increase the durability of tribo-nodes, it is almost impossible to choose the optimal material for specific conditions, since the studies were carried out for various operating conditions and according to various methods. The purpose of the work is to develop a tribotechnical additive to motor oils that provides an increase in the reliability and efficiency of technical operation of medium-speed marine diesel engines by forming a thin-film metal-ceramic coating on the friction surfaces of steel parts of tribo-nodes, which allows to obtain an optimal set of parameters of the wear-resistant coating material. The paper presents studies of the operational properties of additives in engine oil of 17 organo-inorganic tribotechnical materials of 4 groups — natural and artificial polymers, from which more than 20 compositions and composites were made. It has been established that the most promising is the use of nanocomposites based on vermiculite modified with acid as additives in engine oil, since they have a minimum coefficient of friction with boundary lubrication (0.007-0.014) as well as high wear resistance of 40X steel and provide a minimum wear rate of the bearing liner, thereby increasing the tribo-tension life by more than 3 times, and, accordingly, operating costs are reduced.

scholarly journals Research on Fault Prediction for Marine Diesel Engines

2020 ◽  
Vol 08 (08) ◽  
pp. 36-44
Author(s):  
Zhengyang Qi ◽  
Yunsong Qi ◽  
Guangpeng Hu
Keyword(s):  
Diesel Engines ◽  
Fault Prediction ◽  
Marine Diesel

scholarly journals Influence of lubricating oil centrifugal separation intensity in combined cleaning systems on marine diesel engine

2020 ◽  
Vol 2020 (3) ◽  
pp. 23-32
Author(s):  
Nikolai Sergeevich Molokov ◽  
Gennadiy Petrovich Kicha ◽  
Andrei Veniaminovich Nadezkin
Keyword(s):  
Diesel Engines ◽  
Experimental Simulation ◽  
Lubricating Oil ◽  
Centrifugal Separation ◽  
Fuel Quality ◽  
Resource Saving ◽  
Minimum Value ◽  
Marine Diesel ◽  
Engine Wear ◽  
Capacity Index

The article considers the rationality of combined lubricating oil cleaning system in the automatically operated marine diesel engines. The system includes a self-recovering filter and a self-cleaning centrifugal purifier. This combination is found to obtain resource-saving oil using coupled with minimum engine wear and increased reliability. The full-flow filtration of oil in a die-sel engine lubricating system is necessary to protect its friction couples (bearings) from abrasive wear. Centrifugal separation contributes deep oil purification i.e. removal of insoluble impurities reducing lubricating oil service life. By means of experimental simulation there has been found a minimum value of centrifugal purifier capacity index, when engine wear reaches the lowest level and keeps stable. The dependence of engine wear on the fuel quality and centrifugal purification intensity represented by centrifugal purifier capacity index is displayed. The adequacy variance was calculated, the adequacy of the found model being checked by using Fisher criterion. The experimental design and processing of the results have been carried out using orthogonal central composite plan of the second order. Specificity of polynomial when all the points of extremum show the minimum value of engine wear was presented. The model is designed to select the proper oil purifier for forced marine diesel engines with average and increased revolutions.

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