Stress Analysis on a Connecting Rod Big End Bearing of Two-Stroke Marine Diesel Engine

2014 ◽  
Vol 631-632 ◽  
pp. 623-626 ◽  
Author(s):  
Gong Zhi Yu ◽  
Hong Liang Yu ◽  
Shu Lin Duan
Keyword(s):  
Diesel Engine ◽  
Stress Analysis ◽  
Theoretical Basis ◽  
Marine Diesel Engine ◽  
Connecting Rod ◽  
Body Dynamics ◽  
Marine Diesel ◽  
Multi Body

In this paper, the multi-body dynamics software EXCITE was used to simulate the connecting rod big end bearing of two-stroke marine diesel engine. The result showed the stress analysis of connecting rod big end bearing. The purpose is to provide a theoretical basis for the actual conditions of connecting rod big end bearing, and to improve the design of the crankshaft structure.

Crankshaft Transient Motion Analysis for Marine Diesel Engine

2014 ◽  
Vol 926-930 ◽  
pp. 773-776 ◽  
Author(s):  
Hong Liang Yu ◽  
Shu Lin Duan
Keyword(s):  
Diesel Engine ◽  
Stress Distribution ◽  
Motion Analysis ◽  
Theoretical Basis ◽  
Marine Diesel Engine ◽  
Transient Motion ◽  
Body Dynamics ◽  
Marine Diesel ◽  
Deformation Stress ◽  
Multi Body

The multi-body dynamics software EXCITE was used to simulate the marine diesel engine in this paper. The result shown the analysis of the crankshaft transient motion. The purpose provided a theoretical basis on the actual conditions of crankshaft vibration, deformation, stress distribution and improve the design of the crankshaft structure.

scholarly journals Fractographic Study of Marine Diesel Engine Connecting Rod Stud Bolt Crack

2021 ◽  
Vol 58 (4) ◽  
pp. 28-42
Author(s):  
K. Carjova ◽  
V. Priednieks ◽  
R. Klaucans ◽  
I. Irbe ◽  
A. Urbahs
Keyword(s):  
Fatigue Crack ◽  
Diesel Engine ◽  
Tensile Tests ◽  
Marine Diesel Engine ◽  
Connecting Rod ◽  
Worst Case ◽  
The People ◽  
Marine Diesel ◽  
Fatigue Rupture ◽  
Fatigue Crack Development

Abstract Failures of marine diesel engine components can lead to serious consequences for a vessel, cargo and the people on board a ship. These consequences can be financial losses, delay in delivery time or a threat to safety of the people on board. This is why it is necessary to learn about connecting rod bolt failures in order to prevent worst-case scenarios. This paper aims at determining the origin, velocity and the duration of fatigue crack development of a diesel alternator engine which suffered a significant failure of one of its mains, not long after a major overhaul had been completed and with less than 1000 running hours having elapsed. It was verified with fatigue rupture of one of the four connecting rod stud bolts. Tensile tests were performed in the remaining connecting rod bolts. During this procedure, another fatigue crack in an adjacent bolt was identified. The probable root case of damage, and at the end some final remarks are presented.

3D Finite Element Analysis of Marine Diesel Engine Connecting Rod

2011 ◽  
Vol 314-316 ◽  
pp. 351-354
Author(s):  
Bin Zheng ◽  
Yong Qi Liu ◽  
Rui Xiang Liu ◽  
Jian Meng
Keyword(s):  
Finite Element ◽  
Diesel Engine ◽  
Maximum Principal Stress ◽  
Marine Diesel Engine ◽  
Connecting Rod ◽  
3D Finite Element ◽  
Stretch Condition ◽  
Marine Diesel ◽  
Maximum Stretch ◽  
Transition Location

In this paper, with the ANSYS, stress distribution and safety factor of marine diesel engine connecting rod were analyzed by using 3D finite element method. The results show that the position of maximum principal stress is transition location of small end and connecting rod shank at maximum stretch condition. The value of stress is 24.69 MPa in dangerous position. The position of maximum principal stress is transition location of small end and connecting rod shank at maximum stretch condition. The value of stress is 198.65 MPa in dangerous position. Safety factor is 2.51.

Fretting damage prediction of connecting rod of marine diesel engine

2011 ◽  
Vol 25 (2) ◽  
pp. 441-447 ◽  
Author(s):  
Jung Ho Son ◽  
Sung Chan Ahn ◽  
Jong Gug Bae ◽  
Man Yeong Ha
Keyword(s):  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Connecting Rod ◽  
Damage Prediction ◽  
Marine Diesel ◽  
Fretting Damage

Effects of Exhaust Gas Recirculation on Combustion and Emission of a Marine Diesel Engine

2014 ◽  
Vol 926-930 ◽  
pp. 905-908 ◽  
Author(s):  
Hong Liang Yu ◽  
Gong Zhi Yu ◽  
Shu Lin Duan
Keyword(s):  
Diesel Engine ◽  
Theoretical Basis ◽  
Exhaust Gas Recirculation ◽  
Marine Diesel Engine ◽  
Exhaust Gas ◽  
Cylinder Pressure ◽  
Fishing Vessel ◽  
Marine Diesel ◽  
Gas Recirculation ◽  
Load Conditions

Taking into account the formation of thermal NO, the local balance method and Extended Zeldovich model were used in the paper to simulate the combustion and emission of a marine diesel engine with the AVL FIRE software and to verify the model. The effects of exhaust gas recirculation(EGR) ratios of 0%, 10%and 20% on combustion and emission of a diesel engine were discussed. The purpose of the paper provided a theoretical basis for the marine diesel engine upgrade of Chinese small and medium sized vessels, especially fishing vessel engine. The results show that with the increasing of EGR ratio,the cylinder pressure and combustion temperatures decreases and the peak of soot also shown a downward trend and more gentle, under the same load conditions.

Study on the Assembly and Adjustment Technology of the Low-Speed Marine Diesel Engine

2011 ◽  
Vol 422 ◽  
pp. 601-605
Author(s):  
Guo Jin Chen ◽  
Zhong Min Liu ◽  
Ting Ting Liu ◽  
Shao Hui Su ◽  
Guang Jie Yuan ◽  
...  
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Exhaust System ◽  
Thickness Measurement ◽  
Measuring System ◽  
Marine Diesel Engine ◽  
Connecting Rod ◽  
Low Speed ◽  
Marine Diesel ◽  
Assembly Technology

This paper takes the high-power low-speed marine diesel engine as an object to carry out a series of technical researches. These technologies include the assembly and the precision adjustment on the components of the piston, the crosshead and the connecting rod, and the assembly and the timing adjustment on the fuel and exhaust system, the assembly and the precision adjustment on the crankshaft and the engine base. The test technology and system of the high-power marine diesel engine are studied. The new method to determine the assembly quality of the piston and crosshead based on the strain measurement for the small end of the connecting rod and the oil film thickness measurement for the crosshead and the supporting plate is proposed. The stress measuring system for the engine body is built. The engine body’s deformation before and after the crankshaft assembly and the bearing block’s deformation during the crankshaft movement are analyzed to evaluate the stress situation of the crankshaft after the installation. Therefore the assembly technology for the low-speed high-power diesel engine is improved to ensure the reliability of the diesel engine work.

Lubrication Simulation of Main Bearing about a Marine Diesel Engine Based on Multi-Body Dynamics and Elastohydrodynamic

2011 ◽  
Vol 347-353 ◽  
pp. 2679-2683
Author(s):  
Li Dui Wei ◽  
Shu Lin Duan ◽  
Qi Li Wu ◽  
Ji Wu ◽  
Wei Guo
Keyword(s):  
Diesel Engine ◽  
Load Condition ◽  
Engine Block ◽  
Asperity Contact ◽  
The Finite Element Method ◽  
Main Bearing ◽  
Working Cycle ◽  
Body Dynamics ◽  
Marine Diesel ◽  
Multi Body

The purpose of this paper is to find a method to study the lubrication character of the main bearings and load condition of the crankshaft about the marine two-stroke diesel engine. Based on the finite element method, multi-body dynamics, elastohydrodynamic and Green-Tripp theory about contact, the simulation of coupling between the elastic crankshaft and engine block is carried out. The load of main bearings, the minimum of oil film thick, orbital path of journal, average of asperity contact pressure are explored. The results indicate that the lubrication is good except No.2 main bearing. Parts of main bearings appear three peaks in a working cycle, which shows that above theory and elastic crankshaft and engine block is obligatory to simulate the lubrication and load condition accurately.

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