scholarly journals A Study on Anti-Shock Performance of Marine Diesel Engine Based on Multi-Body Dynamics and Elastohydrodynamic Lubrication

2021 ◽  
Vol 11 (23) ◽  
pp. 11259
Author(s):  
Liang Chen ◽  
Dongxin Xue ◽  
Xigeng Song ◽  
Zhaoqi He ◽  
Dongjie Huang
Keyword(s):  
Diesel Engine ◽  
Working Conditions ◽  
Diesel Engines ◽  
Underwater Explosion ◽  
Elastohydrodynamic Lubrication ◽  
Step Size ◽  
Main Bearing ◽  
Calculation Step ◽  
Body Dynamics ◽  
Multi Body

Diesel engine anti-shock performance is important for navy ships. The calculation method is a fast and economic way compared to underwater explosion trial in this field. Researchers of diesel engine anti-shock performance mainly use the spring damping model to simulate the main bearings of a diesel engine. The elastohydrodynamic lubrication method has been continuously used in the main bearings of diesel engines in normal working conditions. This research aims at using the elastohydrodynamic lubrication method in the main bearings of the diesel engine in external shock conditions. The main bearing elastohydrodynamic lubrication and diesel engine multi-body dynamics analysis is based on AVL EXCITE Power Unite software. The external shock is equivalent to the interference on the elastohydrodynamic lubrication calculation. Whether the elastohydrodynamic lubrication algorithm can complete the calculation under interference is the key to the study. By adopting a very small calculation step size, a high number of iterations, and increasing the stiffness of the thrust bearing, the elastohydrodynamic lubrication algorithm can be successfully completed under the external impact environment. The calculation results of the accelerations on engine block feet have a similar trend as the experiment results. Diesel engines with and without shock absorbers in external shock conditions are calculated. This calculation model can also be used for diesel engine dynamics calculations and main bearing lubrication calculations under normal working conditions.

Vibrating Simulation of Diesel Engine Based on Multi-Body Dynamics

2011 ◽  
Vol 97-98 ◽  
pp. 706-711 ◽  
Author(s):  
Kang Shao ◽  
Chang Wen Liu ◽  
Fong Rong Bi ◽  
Xian Feng Du ◽  
Xia Wang ◽  
...  
Keyword(s):  
Diesel Engine ◽  
System Analysis ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Dynamics Simulation ◽  
Main Bearing ◽  
Engine Vibration ◽  
Body Dynamics ◽  
Flexible Body Dynamics ◽  
Multi Body

Taking example of a four-cylinder inline diesel engine that used in vehicle, this paper makes an assembly engine of three-dimensional that based on virtual prototype technology. While using the flexible-body dynamics simulation, the main bearing load that effect engine’s vibration will be gained. And the key point vibration response will be gained when the support part constrained. The experimental results coincide with the simulation results shows the correction of the simulation analysis. The initial stage of the vibration can be predicted by using the method of multi-body system analysis, and this guide the designer to identify the engine vibration.

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.

Research of Amplification Frame Optimization Based on Optistruct

2012 ◽  
Vol 510 ◽  
pp. 541-544
Author(s):  
Bing Zhong
Keyword(s):  
Stress Distribution ◽  
Structural Optimization ◽  
Working Conditions ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Body Dynamics ◽  
Utilization Ratio ◽  
Simulation Results ◽  
The Cost ◽  
Multi Body

The motion of amplification frame of dumper was simulated by multi-body dynamics simulation software ADAMS, and the danger working conditions of amplification frame were calculated. The stress of amplification frame was simulated and analyzed by Optistruct software. The results show that the stress distribution in amplification frame is not uniform and it is big in the middle and small in the edge zeros. The structure of amplification is optimized according to the simulation results. The utilization ratio of the material increases and the cost of production decreases after structural optimization.

Modeling and Kinematics Simulation Analyze of Conventional Suspension with Double Trailing Arms for Light Off-Road Vehicles

2013 ◽  
Vol 312 ◽  
pp. 673-678 ◽  
Author(s):  
Rui Ling Wang ◽  
Jian Zhu Zhao ◽  
Guo Ye Wang ◽  
Xiao Kai Chen ◽  
Liang Li
Keyword(s):  
Working Conditions ◽  
Vertical Plane ◽  
Front Wheel ◽  
Road Vehicles ◽  
Steering Angle ◽  
Helical Springs ◽  
Kinematics Simulation ◽  
Body Dynamics ◽  
Suspension Model ◽  
Multi Body

To study the kinematics characteristics of conventional suspension with double trailing arms for light off-road vehicles, suspension model of a light off-road vehicle was established on multi-body dynamics software ADAMS/View, which has double trailing arms and helical springs, and make the suspension kinematics simulation for getting the caster angle and front-wheel steering angle curves on different working conditions. The results show that the double trailing arm lengths, the angles between double trailing arms and horizontal plane/vertical plane, bushing stiffness of the double trailing arms linking with frame are main parameters that affect the caster angle and front-wheel steering angle. The suspension model is rational.

Strength Analysis of Diesel Engine Crankshaft Based on Flexible Multi-Body Dynamics

2014 ◽  
Vol 654 ◽  
pp. 65-68
Author(s):  
Ling Jin Wang ◽  
Dan Li ◽  
Xiu Xia Lu ◽  
Pei Fan Li ◽  
Ying Jun Jia
Keyword(s):  
Diesel Engine ◽  
High Cycle Fatigue ◽  
Dynamics Simulation ◽  
Strength Analysis ◽  
Cycle Fatigue ◽  
Safety Factors ◽  
Body Dynamics ◽  
Dynamics Calculation ◽  
Multi Body ◽  
Engine Crankshaft

Crankshaft is one of the key parts of the diesel engine. Several causes would be lead to the failure of the crankshaft. A novel strength analysis method is used for crankshaft high cycle fatigue simulation of the diesel engine based on flexible multi-body dynamics in this paper. In order to investigate the fatigue strength of other parts of the diesel engine at the same time, a complete coupled dynamic model of diesel engine crankshaft and block is built and coupled dynamics simulation is carried out. Then dynamics calculation results of each part is extracted for high cycle fatigue analysis and the reliability research of the crankshaft, The simulation results show that, the minimum safety factors of the crankshaft is 1.301, it meet the strength requirements, the safety factors of the block and the cap could be calculated at the same time. These suggest that this method can guide the design of the diesel engine crankshaft and has gained significant importance in practical study.

scholarly journals Multi-Body Dynamics Analysis of V-Type Diesel Engine Crankshaft

2014 ◽  
Vol 8 (1) ◽  
pp. 744-749
Author(s):  
Yanming Xu ◽  
Xianbin Teng ◽  
Zhimin Yu ◽  
Tao Ge
Keyword(s):  
Diesel Engine ◽  
Dynamics Analysis ◽  
Body Dynamics ◽  
Multi Body ◽  
Engine Crankshaft

Experimental Study on Anti-Fatigue Damage Structural Design of Diesel Engine Bearings

2012 ◽  
Vol 214 ◽  
pp. 97-101
Author(s):  
Zhen Jie Guo
Keyword(s):  
Experimental Study ◽  
Fatigue Life ◽  
Diesel Engine ◽  
Service Life ◽  
Fatigue Damage ◽  
Working Conditions ◽  
Structural Design ◽  
Connecting Rod ◽  
Main Bearing ◽  
Modern Times

With higher requirements on energy-saving and environmental protection of diesel engine in the modern times, the loads on main bearing and connecting rod bearing of diesel engine are continuously increased, and also working conditions are even more critical. Bearings are the key moving parts of diesel engine, and play an important influence on reliability, service life and other performances of diesel engine. Therefore, the reasons for fatigue damages to its bearings greatly affect fatigue life. In traditional designs, effects of the problem are studied few. In this paper, therefore, this problem is studied for discussing the formation reasons and solutions for it theoretically.

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.

Dynamics Simulation of Diesel Engine Piston pin Based on ADAMS and its Application in Fault Diagnosis

2011 ◽  
Vol 308-310 ◽  
pp. 1860-1864
Author(s):  
Hai Bing Xiao ◽  
Xiao Peng Xie
Keyword(s):  
Fault Diagnosis ◽  
Diesel Engine ◽  
Dynamics Simulation ◽  
Fast Fourier Transformation ◽  
Engine Piston ◽  
Power Spectral ◽  
Body Dynamics ◽  
Piston System ◽  
Simulation Results ◽  
Multi Body

In this paper, ADAMS multi-body dynamics simulation was introduced in order to solve the diesel engine piston pin dynamics. Take diesel engine piston for example, the model of piston system was established based on ADAMS/Engine module. According to rotational speed of crankshaft, piston pin dynamics simulation was analyzed. Through Fast Fourier Transformation, piston pin power spectral density was got for piston pin fault diagnosis. The results show that simulation results are consistent with theory, dynamics simulation applied in fault diagnosis is feasible.

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