Stress Distribution Analysis on Alloy Layer of High Power Marine Diesel Engine Bearing Bush

2013 ◽  
Vol 331 ◽  
pp. 148-152
Author(s):  
Xiu Xu Zhao ◽  
Zhi Xiang Hu ◽  
An Jian Huang
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Alloy Layer ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Marine Diesel ◽  
Bearing Alloy ◽  
Stress And Strain Distribution ◽  
Engine Bearing ◽  
Oil Film Pressure

According to the characteristics of large size, small clearance ratio, high oil film pressure and thin oil film thickness in the actual conditions of high power marine diesel engine bearing, this Paper analyzes oil film pressure distribution on inner surface of bearing bush based on the finite difference method, uses finite element method to establish the hierarchical model, and analyzes stress and strain distribution on bearing alloy. In addition, this Paper researches the changes of stress and strain distribution on bearing alloy layer when alloy layer thickness changes for the optimization design of high power marine diesel engine bearing bush.

Full Shafting-Based Elastohydrodynamic Lubrication Simulation for Main Bearings of Marine Diesel Engine

2012 ◽  
Vol 479-481 ◽  
pp. 1119-1123 ◽  
Author(s):  
Hui Xing ◽  
Hui Zhang ◽  
Qili Wu ◽  
Shu Lin Duan
Keyword(s):  
Diesel Engine ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Film Pressure ◽  
Oil Film ◽  
Marine Diesel ◽  
Simulation Results ◽  
Lubrication Characteristics ◽  
The Impact ◽  
Oil Film Pressure

To predict and analyze accurately the lubrication characteristics and its influencing factors of main bearing for large low-speed two-stroke marine diesel engine, based on EHD lubrication model of dynamically loaded bearing, coupling simulation between EHD and MBD for main bearing of marine diesel engine was carried out. Systemic models were established separately considering the independent crankshaft of diesel engine and the full shafting of propulsion power plant. Main bearing load, peak oil film pressure, oil film pressure distribution, MOFT and orbital path in one working cycle under rated working conditions were investigated, and simulation results were compared based on both models. The results show that, if the impact of full shafting was considered, the lubrication characteristics of No.8 main bearing changed significantly, the lubrication characteristics of other main bearings were similar as the simulation results of the independent crankshaft model.

On the Continuous Monitoring of Oil-Film Thickness in an Engine Bearing

1978 ◽  
Vol 192 (1) ◽  
pp. 371-376 ◽  
Author(s):  
G. Goodwin ◽  
R. Holmes
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Continuous Monitoring ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Numerical Predictions ◽  
Medium Speed ◽  
Marine Diesel ◽  
Signal Conditioning Circuitry ◽  
Engine Bearing

This paper describes research involving the measurement of oil-film thickness in a large end bearing of a medium-sized medium-speed marine diesel engine. The design of the transducer and its novel signal conditioning circuitry is discussed. Comparisons are made between the measured results and numerical predictions.

Lubrication analysis for the piston ring of a two-stroke marine diesel engine taking account of the oil supply

2019 ◽  
pp. 146808741987211 ◽  
Author(s):  
Tongyang Li ◽  
Xuan Ma ◽  
Xiqun Lu ◽  
Chuanjuan Wang ◽  
Bowen Jiao ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Piston Ring ◽  
Lubricating Oil ◽  
Design Parameters ◽  
Bench Test ◽  
Marine Diesel Engine ◽  
Oil Film ◽  
Oil Supply ◽  
Marine Diesel ◽  
The Impact

The piston ring is one of the most important parts of a two-stroke marine diesel engine. It is lubricated by a special mode in which the lubricating oil is directly injected into the liner’s inner surface. In this article, taking account of the oil supply, a piston ring lubrication model is developed based on oil mass conservation. The lubrication region of this piston ring–cylinder liner is divided into inlet, core lubrication, and outlet regions, with the oil supply being converted into an oil film. The impact of the width of the core lubrication region on squeezing of the oil is considered. To verify the model, friction force measurements are performed in a reciprocating bench test under fully flooded conditions, and the model is further validated by comparing the minimum oil film thickness with data from the literature. The model is applied to the top ring of a two-stroke marine diesel engine, and the impacts of the oil supply and its design parameters are analyzed.

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.

Finite Element Analysis of Marine Diesel Engine Frame

2011 ◽  
Vol 421 ◽  
pp. 320-324
Author(s):  
Guang Jie Yuan ◽  
Jie Sun ◽  
Jun Luo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Diesel Engine ◽  
High Power ◽  
Cylinder Block ◽  
Marine Diesel Engine ◽  
Three Dimension ◽  
Element Analysis ◽  
Finite Element Software ◽  
Marine Diesel

Taking the marine low-speed high power diesel engine frame for example, created a three-dimension model through UG. By using the finite element software ANSYS investigated the body’s stress status and displacement which provides a valuable reference for the structural optimization of the cylinder block of diesel engine’s design.

Numerical Analysis of High Power Marine Diesel Engine Main Bearing Load and Lubricating Properties

2013 ◽  
Vol 331 ◽  
pp. 25-30
Author(s):  
Xiu Xu Zhao ◽  
An Jian Huang ◽  
Zhi Xiang Hu
Keyword(s):  
Diesel Engine ◽  
High Power ◽  
Dynamic Pressure ◽  
Marine Diesel Engine ◽  
Main Bearing ◽  
Minimum Thickness ◽  
Medium Speed ◽  
Bearing Load ◽  
Marine Diesel ◽  
Lubrication Condition

The main bearing is one of the primary friction pairs of a diesel engine. The lubrication condition affects the performance of the marine diesel engine directly. Continuous working time of main bearings is longer, load is higher and working condition is even worse especially in low medium speed marine diesel engine, making it difficult to form good dynamic pressure lubrication.Therefore, this paper takes a high-power marine diesel G32 with 9 cylinders as an example, calculates and analyzes the load, the orbit of main shaft center and the minimum thickness of oil film in each main bearing, providing the basis to estimate each main bearing’s lubricating condition, predicting each main bearing’s performance precisely and judging whether there exists abnormal working conditions in each main bearing.

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