Research on the intelligent generation method of MBD model 3D marking using predefined features

2020 ◽  
Vol 28 (3) ◽  
pp. 222-238
Author(s):  
Xuwen Jing ◽  
Mingming Tang ◽  
Jinfeng Liu ◽  
Honggen Zhou ◽  
Peng Zhao ◽  
...  
Keyword(s):  
Technological Innovation ◽  
Process Design ◽  
Connecting Rod ◽  
Association Model ◽  
Global Manufacturing ◽  
Modeling Problem ◽  
Marine Diesel ◽  
Expression Model ◽  
Product Manufacturing ◽  
Rapid Modeling

Model-based definition (MBD) carries out a technological innovation for global manufacturing, application of MBD technology plays an important supporting in process design, product manufacturing and other development activities, rapid creation of MBD models have become a key to reduce time and cost for enterprises. However, interactive dimensioning method has severely hampered the efficiency of MBD model creation. This paper mainly studies the dimensions intelligent marking method based on the predefined features to solve the rapid modeling problem of MBD model. Firstly, the expression model of dimensions metadata is established based on the feature identifier. Secondly, by establishing an association mechanism between the dimensions and the predefined feature, the “model-feature-dimensioning” association model is formed. Thirdly, through analysis of the dimensioning type, the intelligent dimensioning algorithm process is determined. Moreover, the completeness check of the dimensions is guaranteed during the marking process. Finally, taking the connecting rod and crankshaft of marine diesel as the research object, the effectiveness of this method is verified.

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.

Research on visual 3D assembly process design and simulation for marine diesel engine

2017 ◽  
Vol 22 (S3) ◽  
pp. 5505-5519
Author(s):  
Zhang Hui ◽  
Fei Tianming ◽  
Guan Wei ◽  
Zhang Shengwen ◽  
Jin Zhipeng ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Process Design ◽  
Marine Diesel Engine ◽  
Assembly Process ◽  
Marine Diesel ◽  
3D Assembly

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.

Analysis of the Lubrication Condition of a Crosshead Pin Bearing of a Large Marine Diesel Engine

2005 ◽  
Author(s):  
Sylvester Abanteriba
Keyword(s):  
Operating Conditions ◽  
Main Function ◽  
Connecting Rod ◽  
Operating Cycle ◽  
Lubrication Film ◽  
Normal Forces ◽  
Lubricating Film ◽  
Marine Diesel ◽  
Lubrication Condition ◽  
Low Levels

The main function of the crosshead bearing of a crosshead engine is to transmit the load from the connecting rod, which is directly attached to the piston of the engine, through a second rod to the guide shoe, which bears the entire crosshead. Apart from this function it enables the large normal forces, which are usually borne by the piston skirt in the case of a trunk piston engine, to be transmitted to the guide shoe from which it is subsequently transmitted to the rails along which the guide shoe glides. The dynamics of the crosshead bearing is such that the bearing pin is subjected to very low levels of incomplete rotation resembling that executed by a pendulum over a reduced arc. The bearing is also subjected to the load in only one direction. These operating conditions augur poorly for the formation of the hydrodynamic oil film necessary to support the imposed load. This type of bearing is therefore susceptible to considerable friction losses and significant wear as a result of lack of the capacity to generate lubrication film. This paper evaluates a model to determine the levels of achievable hydrodynamic film and the measures introduced to generate a hydrostatic squeeze lubricating film in the bearing as a result of the introduction of high pressure oil during part of the operating cycle of the engine.

On the Continuous Temperature Monitoring of an Engine Bearing

1977 ◽  
Vol 191 (1) ◽  
pp. 161-167 ◽  
Author(s):  
G. Goodwin ◽  
R. Holmes
Keyword(s):  
Fuel Oil ◽  
Lubricating Oil ◽  
Bearing Surface ◽  
Connecting Rod ◽  
Marine Diesel ◽  
Mechanical Linkage ◽  
Load Conditions ◽  
Continuous Temperature ◽  
Made In ◽  
Engine Bearing

Measurements of bearing surface temperature were made in a large end bearing of a marine diesel engine, the data being communicated by a mechanical linkage attached to the connecting rod. The engine was run with the lubricating oil heavily diluted with fuel oil, and also with a variety of load conditions on the test cylinder. Some observations were made immediately after a rapid start in order to assess the effects of priming of the lubrication system. The observations are discussed and some qualitative conclusions drawn.

Effect of Connecting Rod Obliquity on the Torsional Vibration of Marine Diesel Engines with Variable Inertia

1986 ◽  
Vol 10 (4) ◽  
pp. 201-211 ◽  
Author(s):  
M.R. Haddara ◽  
M.A. Younis
Keyword(s):  
Fourth Order ◽  
Diesel Engines ◽  
Torsional Vibration ◽  
Analytical Method ◽  
Numerical Solutions ◽  
Connecting Rod ◽  
Secondary Resonance ◽  
Resonant Frequencies ◽  
Marine Diesel ◽  
Insight Into

Recent instances of marine crankshaft failure were attributed to secondary resonance which is a consequence of variable inertia. More insight into the secondary resonance producing mechanism may be gained by considering the effect of connecting rod obliquity. In this work an analytical method for the study of the effect of variable inertia, taking into account the obliquity of the connecting rod, is developed. New resonant frequencies are found. Expressions defining the boundaries between resonant and non-resonant solutions are derived. Moreover, numerical solutions are obtained using a fourth order Runge-Kutta algorithm. Results obtained from both approaches are in agreement.

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.

The Design Research on the Key Components of Low-Speed Marine Diesel Engine

2014 ◽  
Vol 599-601 ◽  
pp. 499-502
Author(s):  
Tin Tin Liu ◽  
Guo Jin Chen ◽  
Zhong Min Liu
Keyword(s):  
Diesel Engine ◽  
Optimization Model ◽  
Design Research ◽  
Simulation Optimization ◽  
Marine Diesel Engine ◽  
Constraint System ◽  
Marine Diesel ◽  
Expression Model ◽  
Mapping Mechanism

This paper is mainly discussed the establishment of the unified constraint expression of simulation optimization model. Express all kinds of element constraints with unified physical mathematical mapping mechanism, uniform the model representation of product components in each domain and establish the unified expression model, in order to facilitate the follow-up simulation solution of multi-domain constraint system.

Sign in / Sign up

Export Citation Format

Share Document