scholarly journals A Visualization Solution of the Stress State of Connecting-rod Big End in the Experimental Device for Lubricating Condition of the Connecting-rod Big End Bearing

2020 ◽  
Vol 30 (7) ◽  
pp. 37-42
Author(s):  
Thi Thanh Hai Tran ◽  
Anh Dung Le ◽  
Tien Dat Do
Keyword(s):  
Stress State ◽  
Ccd Camera ◽  
Experimental Device ◽  
Connecting Rod ◽  
Operating Cycle ◽  
Visualization System ◽  
Oil Film ◽  
Rod Model ◽  
Load Simulation ◽  
Oil Film Pressure

This paper presents a visualization solution of the stress state of the connecting-rod big end in the experimental device for lubricating of the connecting-rod big end bearing. The connecting-rod model is in photoelastic material that is subjected to the load simulation corresponding to the engine's operating cycle. This experimental device and the connecting-rod model are used to determine the load diagram, measure the oil film pressure, oil film thickness, oil film temperature. In this study, a visualization system of stress state in the connecting-rod big end is built that stress of connecting-rod is one of the characteristics when we study the connecting-rod big end bearing. The stress state of the connecting-rod is visualized by the transmission photoelasticimetry. This method allows the visualization of the isochrones fringes, which are lines of equal difference regarding the main stress in the connecting-rod. The visualization system consists of a polarizer, two quarter ware blades, and an analyzer. The stress contour’s images of the connecting-rod at different angles of the crankshaft are realized by a CCD camera. The stress state in the connecting-rod is compatible with the load applied.

A Measurement of Oil Film Pressure Distribution in Connecting Rod Bearing With Test Rig

1992 ◽  
Vol 35 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Tsuyoshi Masuda ◽  
Kenshi Ushijima ◽  
Kyugo Hamai
Keyword(s):  
Pressure Distribution ◽  
Connecting Rod ◽  
Test Rig ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure

Wear of Dynamically Loaded Hydrodynamic Bearings by Contaminant Particles

1980 ◽  
Vol 102 (4) ◽  
pp. 452-458 ◽  
Author(s):  
A. Ronen ◽  
S. Malkin ◽  
K. Loewy
Keyword(s):  
Wear Intensity ◽  
Linear Wear ◽  
Connecting Rod ◽  
Operating Cycle ◽  
Hydrodynamic Bearings ◽  
Oil Film ◽  
Dimensional Changes ◽  
Air Cleaners ◽  
Dynamic Loading Conditions ◽  
Engine Bearing

An investigation is reported on the wear of hydrodynamic bearings by contaminant particles in the oil under dynamic loading conditions. A test bearing rig was developed to dynamically simulate an automotive connecting rod engine bearing, and the contaminant additions were of the types normally used for testing of automotive oil filters and air cleaners. Shaft and linear wear for clean and contaminated oil were measured both in terms of dimensional changes and weight loss at two different rotating speeds. As compared with clean oil, both shaft and linear wear were found to increase by typically a factor of 20 when running with the contaminated oil. A direct correlation was found between the local oil film thickness history and wear intensity for both the clean and contaminated oil. The wear tended to increase steeply at those locations where the oil film was smaller for a greater portion of the operating cycle.

The Analysis of the Deformation and Contact Lubrication Problem of HPD Diesel Engine Connecting Rod Bearings Based on the FFT Method and Flexibility Matrix Method

2012 ◽  
Vol 602-604 ◽  
pp. 2170-2173
Author(s):  
Jun Yan Zhang ◽  
Su Fen Zhang ◽  
You Wei Zhang
Keyword(s):  
Dynamic Load ◽  
Matrix Method ◽  
Journal Bearing ◽  
Load Condition ◽  
Connecting Rod ◽  
Film Pressure ◽  
Oil Film ◽  
Flexibility Matrix ◽  
Steady Load ◽  
Oil Film Pressure

Based on the fast fourier transform (FFT) and flexibility matrix method, the effects of the FFT and flexibility matrix method on the distribution of oil film pressure, elastic deformation in the steady load and the journal center orbit of the connecting rod big-end bearings in the dynamic load are investigated. The results are shown that when the eccentricity ratio is more than 1, the maximum oil film pressure obtained by FFT method is bigger on both ends of the journal bearing and on its intermediate position is smaller. To the connecting rod big-end bearing, under the dynamic load condition, there is the same trend of the journal center orbit with two methods. However, with FFT method, the journal is largely deviated from bearing center.

Study of Cavitation and Wear Damages in Conrod Big End Bearing of a Heavy Duty Diesel Engine by Using Elasto-Hydrodynamic Method

2009 ◽  
Author(s):  
Hadiseh Karimaei ◽  
Hamidreza Chamani
Keyword(s):  
Diesel Engine ◽  
Heavy Duty ◽  
Connecting Rod ◽  
Cavitation Damage ◽  
Oil Film ◽  
Heavy Duty Diesel Engine ◽  
Hydrodynamic Method ◽  
Heavy Duty Diesel ◽  
Wear Damage ◽  
Oil Film Pressure

Wear and cavitation erosion are the common damages in engine bearing shells. In the case of cavitation damage, the generation and immediate collapse of small gas bubbles cause high pressure pulses and the bearing surface is being locally damaged. Cavitation damage is observed in heavy duty diesel engine due to highly dynamic loading, oscillation of pins, turbulence of oil flow and other factors. Wear damage induces adjustment in the bearing geometry and affects the oil film pressure and the durability of bearing shell. In this paper, wear and cavitation damages in connecting rod big end bearing have been studied. In order to compute the bearing lubrication characteristic such as minimum oil film thickness and maximum oil film pressure, Elasto-Hydrodynamic method that incorporates mass conserving algorithm has been utilized. Wear and cavitation damages in two different designs of connecting rod structure in a heavy duty diesel engine have been assessed and the results have been presented. Furthermore, the effect of connecting rod structure on wear damage has been investigated.

Numerical Simulation on Velocity Profiles of Mill Bearing Lubrication

2010 ◽  
Vol 145 ◽  
pp. 282-286
Author(s):  
Qing Xue Huang ◽  
Jian Mei Wang ◽  
Yu Gui Li ◽  
Li Feng Ma ◽  
Chun Jiang Zhao
Keyword(s):  
Cross Section ◽  
Velocity Profiles ◽  
Flow State ◽  
Oil Film ◽  
Velocity Gradients ◽  
Oil Flow ◽  
The Mathematical Model ◽  
The Relationship ◽  
General Velocity ◽  
Oil Film Pressure

No 460 oil-film bearing oil as the dedicated lubricant is regarded as the incompressible Newtonian fluid. To comprehensively analyze the real oil flow state, the mathematical model on velocity profiles, together with its dimensionless equations, is established, and the calculating program is developed to simulate the 3D velocity profiles and velocity gradients at different oil flow layers. The relationship between velocity profiles and the oil film pressure is discussed, and the velocity tendency is consistent with the general velocity profile of wedge cross section. The conclusions are beneficial to the further study on lubricating performances of heavy contact components and to prolong their service lives.

A Ritz Model of Unsteady Oil-Film Forces for Nonlinear Dynamic Rotor-Bearing System

2004 ◽  
Vol 71 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Tiesheng Zheng ◽  
Shuhua Yang ◽  
Zhonghui Xiao ◽  
Wen Zhang
Keyword(s):  
Free Boundary ◽  
Ritz Method ◽  
Computing Time ◽  
Force Model ◽  
The Finite Element Method ◽  
Oil Film ◽  
Great Saving ◽  
Cavitation Region ◽  
The Given ◽  
Oil Film Pressure

Based on the free boundary theory and variational method, this paper presents a Ritz method to compute the instantaneous hydrodynamic forces of a real bearing subject to any perturbed motions of the rotor. The given method manipulates the cavitation region by simply introducing a parameter to match the free boundary condition and, as a result, a very simple approximate formula of oil-film pressure were obtained leading to great saving of computing time. The numerical examples show the high accuracy of the proposed formulas. This oil-film force model is also used to analyze the nonlinear dynamics of a rigid unbalanced rotor with elliptical bearing support. The results well agree with those of the oil-film force model computed by the finite element method and the computing time is saved greatly.

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