Analysis of multi-stage running-in process of Sn-11Sb-6Cu alloy and AISI 1045 with phase trajectory plot

2021 ◽  
pp. 1-14
Author(s):  
Yuankai Zhou ◽  
Huan Zhao ◽  
Xue Zuo
Keyword(s):  
Diesel Engine ◽  
Friction Coefficient ◽  
Surface Topography ◽  
Phase Trajectory ◽  
Sliding Bearings ◽  
Phase Trajectories ◽  
Multi Stage ◽  
Stable Attractor ◽  
Aisi 1045

Abstract Running-in of the main bearings of diesel engine is a crucial process before service. Multi-stage running-in is a better way to enhance running-in quality and efficiency. In order to reveal the evolution of phase trajectory and compare the running-in quality, the running-in tests were performed with the material of bearing bush (Sn-11Sb-6Cu) and shaft (AISI 1045). The running-in quality was comprehensively evaluated via friction coefficient, phase trajectory and surface topography. Results indicate that the phase trajectories show a trend of stage-by-stage convergence. The multi-stage running-in can achieve a more stable attractor, lower friction coefficient and smoother surface, that is, a better running-in quality than the constant running-in scheme. This study provides a reference for formulating running-in specifications for sliding bearings.

Modification of the Sliding Joint in Equipment Tribotestor M`89

2020 ◽  
Vol 994 ◽  
pp. 296-303
Author(s):  
Jarmila Oravcová ◽  
Eva Labašová
Keyword(s):  
Friction Coefficient ◽  
Cylindrical Surface ◽  
Structural Modification ◽  
Plane Surface ◽  
Experimental Tests ◽  
Sliding Bearings ◽  
Sliding Joint

This work deals with the modification of the equipment Tribotestor. The equipment was originally designed to measure the friction coefficient of sliding bearings. The structural modification of the attachment of the sliding node has expanded its use. The equipment now also allows to measure the parameters of sliding nodes, which consist of a plane surface and a cylindrical surface. Correctness of this modification was verifieded by the experimental tests performed on several samples.

CONSISTENCY ANALYSIS OF WORN SURFACE TOPOGRAPHY AND FRICTION FORCE BASED ON PHASE TRAJECTORY AND RECURRENCE ANALYSIS

Fractals ◽  
2019 ◽  
Vol 27 (08) ◽  
pp. 1950130
Author(s):  
XUE ZUO ◽  
MINGLONG PENG ◽  
YUANKAI ZHOU
Keyword(s):  
Fractal Dimension ◽  
Surface Topography ◽  
Friction Force ◽  
Phase Trajectory ◽  
Small Volume ◽  
Surface Profile ◽  
Recurrence Plots ◽  
Recurrence Analysis ◽  
Wear Process ◽  
Worn Surface

The dynamic evolutions of friction force and worn surface profile were qualitatively analyzed by phase trajectory and recurrence plots and quantitatively characterized by fractal dimension and percent determinism. The results show that phase trajectories first shrink to a small volume, then stabilize at a minimum volume, finally expand to a large volume in the wear process. The white areas on the recurrence plots increase with the wear time. The fractal dimension first increases, then stabilizes at a high value, and finally decreases rapidly. The percent determinism first decreases, then fluctuates in a certain range, and finally increases. It demonstrates that friction force and worn surface topography derived from one tribology system evolve in a similar but not exactly the same way. They have the consistent evolution law in the wear process. Specially, friction force is much more sensitive to the variation of wear states than the worn surface.

Simultaneous Measurement of Surface Topography and Friction Force by a Single-Head Lateral Force Microscope

1995 ◽  
Vol 117 (2) ◽  
pp. 334-340 ◽  
Author(s):  
C.-J. Lu ◽  
Zhaoguo Jiang ◽  
D. B. Bogy ◽  
T. Miyamoto
Keyword(s):  
Friction Coefficient ◽  
Surface Topography ◽  
Friction Force ◽  
Rotation Angle ◽  
Point Contact ◽  
Lateral Force ◽  
Wear Depth ◽  
Optical Head ◽  
Lateral Force Microscope ◽  
Normal Deflection

Although friction force measurements using one sensor to detect both the normal deflection and rotation angle of a scanning probe are convenient and popular, the critical issues regarding the calibration of the instruments have not been fully studied. A Lateral Force Microscope (LFM), modified from the Point Contact Microscope (PCM), is used to simultaneously measure the surface topography and friction force. An optical head is used to measure the normal bending deflection and rotation angle of the cantilever that carries the diamond tip. Emphasis is put on the development of reliable calibration procedures for obtaining the normal deflection and rotation sensitivities of the optical head as well as the spring constants in the bending and torsion modes. The friction loop, which is essential for friction measurements, is investigated in detail. The LFM is used to measure a two-phase composite to show its ability to distinguish different materials on a surface. Wear tests on a single-crystal silicon <100> surface show different friction coefficient regimes, depending on the applied load. For small loads, there is no wear and the friction coefficient is constant. For larger loads, the friction coefficient and wear depth increase with normal load.

Analysis and Models for the Friction Coefficient of a Sliding Bearing

2013 ◽  
Vol 395-396 ◽  
pp. 826-830
Author(s):  
Bao Ming Wang ◽  
Jin Xin Xu ◽  
Fei Zhu ◽  
Zai Xin Wu
Keyword(s):  
Friction Coefficient ◽  
Rotational Speed ◽  
Moving Average ◽  
Grey System Theory ◽  
Grey System ◽  
Sliding Bearings ◽  
Sliding Bearing ◽  
Non Linear ◽  
Grey Relational Grade ◽  
Grey Relational

In this paper, the analyzing and modeling of the friction coefficient in sliding bearing is reported. Based on the grey system theory, the effects of rotational speed and load on the friction coefficient of the sliding bearings are investigated. The grey relational grade is an important parameter to measure the effects of rotational speed and load on friction coefficient of the sliding bearings. The grey relational grade analysis shows that load has an even more significant effect upon the friction coefficient compared with rotational speed. On the basis of analyzing and processing the experimental data, a nonlinear model for friction coefficient of a sliding bearing have been set up by NARMAX Non-Linear Auto-Regressive Moving Average with Exogenous Input. It was found that the NARMAX Non-Linear model has good accuracy and is applicable for the calculation of friction coefficient in sliding bearing.

scholarly journals Theoretical study to determine the proper injection system for upgrading fuel system of diesel engine om357 to common rail system

2018 ◽  
Vol 7 (4) ◽  
pp. 2594
Author(s):  
Razieh Pourdarbani ◽  
Ramin Aminfar
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Engine Performance ◽  
Injection Pressure ◽  
Common Rail ◽  
Injection System ◽  
Injection Timing ◽  
Common Rail System ◽  
Common Rail Injection System ◽  
Multi Stage

In this research, we tried to investigate all the fuel injection systems of diesel engines in order to select the most suitable fuel injection system for the OM357 diesel engine to achieve the highest efficiency, maximize output torque and reduce emissions and even reduce fuel consumption. The prevailing strategy for this study was to investigate the effect of injection pressure changes, injection timing and multi-stage injection. By comparing the engines equipped with common rail injection system, the proposed injector for engine OM357 is solenoid, due to the cost of this type of injector, MAP and controller (ECU). It is clear that this will not be possible only with the optimization of the injection system, and so other systems that influence engine performance such as the engine's respiratory system and combustion chamber shape, etc. should also be optimized. 

scholarly journals The gas-dynamic antifriction coating of babbitt for bearings of the turbine rotor

2019 ◽  
Vol 298 ◽  
pp. 00036
Author(s):  
Irina Tsareva ◽  
Olga Berdnik ◽  
Lyudmila Krivina ◽  
Yuri Levanov
Keyword(s):  
Friction Coefficient ◽  
Service Life ◽  
Adhesion Strength ◽  
Turbine Rotor ◽  
Low Friction ◽  
Antifriction Coating ◽  
Sliding Bearings ◽  
Gas Dynamic ◽  
Working Surface ◽  
High Adhesion

The application of the anti-friction coating of babbitt on the working surface of sliding bearings is an important technological procedure necessary both for their manufacture and for their repair. To extend the service life and restore the performance of bearings, the coating is preferably applied by gas-dynamic spraying, The coating formed by this method has a low porosity, high adhesion strength and low friction coefficient.

Sign in / Sign up

Export Citation Format

Share Document