scholarly journals Reliability optimization of process parameters for marine diesel engine block hole system machining using improved PSO

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Honggen Zhou ◽  
Weibin Yang ◽  
Li Sun ◽  
Xuwen Jing ◽  
Guochao Li ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Process Parameters ◽  
Machining Process ◽  
Engine Block ◽  
Stable Region ◽  
Particle Swarm Algorithm ◽  
Marine Diesel Engine ◽  
Reliability Optimization ◽  
Process Reliability ◽  
Marine Diesel

AbstractThe processing quality of the block hole system affects the working performance of the marine diesel engine block directly. Choosing an appropriate combination of process parameters is a prerequisite to improving the accuracy of the block hole system. Uncertain fluctuations of process parameters during the machining process would affect the process reliability of the block hole system, resulting in an ultra-poor accuracy. For this reason, the RBF method is used to establish the relationship between the verticality of the cylinder hole and process parameters, including cutting speed, depth of cut, and feed rate. The minimum cylinder hole verticality is taken as the goal and the process reliability constraints of the cylinder hole are set based on Monte Carlo, a reliability optimization model of processing parameters for cylinder hole is established in this paper. Meanwhile, an improved particle swarm algorithm was designed to solve the model, and eventually, the global optimal combination of process parameters for the cylinder hole processing of the diesel engine block in the reliability stable region was obtained.

scholarly journals Machining-Reliability-based Optimization of Process Parameters for Marine Diesel Engine Block Hole System Using HJ-PSO

2021 ◽  
Author(s):  
HONGGEN ZHOU ◽  
Weibin Yang ◽  
LI SUN ◽  
XUWEN JING ◽  
GUOCHAO LI ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Process Parameters ◽  
Machining Process ◽  
Engine Block ◽  
Stable Region ◽  
Depth Of Cut ◽  
Particle Swarm Algorithm ◽  
Marine Diesel Engine ◽  
Process Reliability ◽  
Marine Diesel

Abstract The processing quality of the block hole system affects the working performance of the marine diesel engine block directly. Choosing an appropriate combination of process parameters is a prerequisite to improve the accuracy of the block hole system. Uncertain fluctuations of process parameters during the machining process would affect the process reliability of the block hole system, resulting in an ultra-poor accuracy. For this reason, the RBF method is used to establish the relationship between the verticality of the cylinder hole and process parameters, including cutting speed, depth of cut, and feed rate. Taking the minimum cylinder hole verticality as the goal and setting the process reliability constraints of the cylinder hole based on Monte Carlo, a reliability optimization model of processing parameters for cylinder hole is established in this paper. Meanwhile, an improved particle swarm algorithm was designed to solve the model, and eventually, the global optimal combination of process parameters for the cylinder hole processing of the diesel engine block in the reliability stable region was obtained.

New In-Situ Technology for Marine Diesel Engine Crankshaft Renovation and its 3D Surface Texture Model

2012 ◽  
Author(s):  
Toms Torims ◽  
Branko Katalinic ◽  
Andris Ratkus ◽  
Janis Vilcans ◽  
Marcis Zarins
Keyword(s):  
Surface Roughness ◽  
Diesel Engine ◽  
Machining Process ◽  
Marine Diesel Engine ◽  
Roughness Parameters ◽  
Surface Roughness Parameters ◽  
3D Surface ◽  
Crankshaft Journal ◽  
Marine Diesel ◽  
Engine Crankshaft

Repairing marine diesel engine crankshafts is a significant part of overall engine repairs and thus is very important for the ship building and ship repair industry. When a ship’s diesel engine is repaired, crankshaft journal surfaces must be renewed according to very precise geometrical and surface roughness requirements. Although current technologies are sufficient to meet these requirements, they are very time consuming and consequently expensive. A comprehensive research into the surface machining of marine diesel engine crankshaft journals allowed to improve technological processes and to identify respective surface roughness parameters, as well as to provide appropriate technological recommendations. It is important to note that crankshaft journal surfaces must be seen as 3D objects, whose micro-topographical surface roughness parameters have to be defined so that they reflect the actual surface. To summarize all available scientific research in this field, we can state that there has been no analysis into the impact of technological regimes on the surface micro-topography of marine engine crankshaft journals. Bearing in mind the aforementioned arguments a study has been launched to develop a novel grinding technology, enabling diesel engine crankshafts with medium-sized crankpin journals to be repaired directly inside the engine housing. This paper covers the following issues: 1) Description of the novel technological equipment for crankshaft journal grinding; 2) 3D roughness model of the crankshaft journal surface; 3) calculation of 3D parameters based on practical metrological and technological characteristics. This technology saves significant financial resources as well as reduces engine repair time. By solving problems related to surface accuracy, it is possible to considerably improve the crankshaft machining process, along with the performance of maintenance operations and consequently the overall quality of repair work. In this paper, the crankshaft journal surfaces will be defined using 3D surface roughness parameters.

Virtual Machining Process System for Marine Diesel Engine Key Parts

2010 ◽  
Vol 33 ◽  
pp. 418-422
Author(s):  
C.S. Zhu ◽  
Ling Xu ◽  
X.F. Fang ◽  
S.W. Zhang ◽  
H.Y. Wang
Keyword(s):  
Diesel Engine ◽  
Traditional Method ◽  
Manufacturing Industry ◽  
Development Time ◽  
Machining Process ◽  
Marine Diesel Engine ◽  
Virtual Machining ◽  
Marine Diesel ◽  
Process System

The virtual machining process system is built based on VERICUT platform to simulate the whole procedure of machining marine diesel engine key parts. It changes the traditional method of test-cutting, shortens development time and ensures the safety of the actual machining process system. Examples of machining marine diesel engine frame and cylinder cover are done to verify the effectiveness of this system. It is demonstrated that it has a wide application future and spreading value in the production of marine diesel engine key parts and the whole manufacturing industry.

Three-Dimensional Vibration of the Crankshaft of a Large Marine Diesel Engine Under a Mixed Thermo-Elastic-Hydro-Dynamic Lubrication Coupling Between Flexible Crankshaft and Engine Block

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Lidui Wei ◽  
Haijun Wei ◽  
Haiping Du ◽  
Shulin Duan
Keyword(s):  
Diesel Engine ◽  
Three Dimensional ◽  
Coupling Model ◽  
Engine Block ◽  
Effect Of Temperature ◽  
Marine Diesel Engine ◽  
Strongly Coupled ◽  
Marine Diesel ◽  
Vibration Mechanism ◽  
Set Up

To predict the vibration characteristics of the crankshaft of the larger marine diesel engine accurately and comprehensively, based on the finite element models of the crankshaft and the engine block reduced by a component mode synthesis (CMS) method as well as extended Reynolds equation and Greenwood-Tripp theory, a mixed thermo-elasto-hydro-dynamic lubrication coupling model between a whole flexible engine block and a rotating flexible crankshaft is set up. According to this strongly coupled nonlinear model, the torsional-axial-lateral three-dimensional (3D) vibration of the crankshaft can be calculated simultaneously. The method is verified through comparison with other computational methods. Also, the vibrations are compared under different support models and whether to consider the effect of temperature. Specific 3D vibrations are displayed, and some stage nonlinear characteristics are shown in 3D direction. The modeling method will contribute to reveal the vibration mechanism and optimize the design of the shafting system.

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