In-Service Lubricant Analysis

2016 ◽  
pp. 539-558
Keyword(s):  
Lubricant Analysis

A novel method for the evaluation of the contamination dispersing ability of lubricants (CONTA-DISP)

2021 ◽  
Vol 68 (3-4) ◽  
pp. 22-28
Author(s):  
Bettina Ronai ◽  
Rainer Franz ◽  
Marcella Frauscher
Keyword(s):  
Lubricating Oils ◽  
Practical Procedure ◽  
Particulate Contamination ◽  
Optimum Parameters ◽  
Analysis Methods ◽  
Lubricant Analysis ◽  
Novel Method ◽  
Dispersing Ability

Water and solid particulate contamination are the two most common contaminants of lubricated systems and may be highly problematic for these systems. To reduce downtime and prevent failure, lubricant formulations contain detergent and dispersant additives that play an important role in terms of contamination tolerance. In lack of a practical procedure for the determination of the relevant properties, a novel method for the evaluation of the dispersing ability of lubricating oils is introduced. Following and combining established lubricant analysis methods, a procedure with optimum parameters was found. An assessment of the method using fresh and artificially altered lubricating oils allowed a differentiation concerning their dispersing ability.

scholarly journals Monitoring of Agricultural Machines with Used Engine Oil Analysis

2015 ◽  
Vol 63 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Daniel Bekana ◽  
Antoni Antoniev ◽  
Martin Zach ◽  
Jan Mareček
Keyword(s):  
Performance Monitoring ◽  
Predictive Maintenance ◽  
Vibration Monitoring ◽  
Engine Oil ◽  
Cost Cutting ◽  
Maintenance Program ◽  
Used Motor Oil ◽  
Lubricant Analysis ◽  
Monitoring Performance ◽  
Agricultural Machines

Predictive maintenance has gained wide acceptance as a cost cutting strategy and improve maintenance in modern industry. Condition monitoring by lubricant analysis is one of the basic tools of a predictive maintenance program along with vibration monitoring, performance monitoring and thermography. In many cases, it enables identification of a potential problem before a major repair is necessary and downtime during critical operations can be avoided.In this paper we analyzed the used motor oil and its remaining resource in agricultural machines.

Elastic Connecting-Rod Bearing With Piezoviscous Lubricant: Analysis of the Steady-State Characteristics

1979 ◽  
Vol 101 (2) ◽  
pp. 190-197 ◽  
Author(s):  
B. Fantino ◽  
J. Frene ◽  
J. Du Parquet
Keyword(s):  
Steady State ◽  
Film Thickness ◽  
Plane Elasticity ◽  
Operating Conditions ◽  
Maximum Pressure ◽  
Connecting Rod ◽  
Oil Film ◽  
Lubricant Analysis ◽  
Relative Eccentricity ◽  
Dimensional Equation

The effect of the deformation of an automotive connecting-rod on the oil film characteristics are studied. The simultaneous elastic deformation and pressure distribution are obtained by iterative methods in steady-state conditions under realistic speeds and loads (5500 rpm, 25,000 N). Plane elasticity relations are used in this study. The following parameters are investigated: —bearing characteristics: bearing thickness B and bearing clearance C, —operating conditions: journal speed N and applied load W, —lubricant: viscosity μ0 and piezoviscous coefficient α. As a result of the deformation, the maximum pressure and the attitude angle are decreased and the relative eccentricity is greatly increased. The minimum oil film thickness is slightly but systematically decreased. The piezoviscosity effect is noticeable only at high loads: it increases slightly the oil film thickness and the maximum pressure. An empirical dimensional equation for the minimum oil film thickness hm is derived numerically for the bearing considered. Thus: hm∼μ0NW0.5(1+0.06108α)B0.12C0.09

Hypernated supercritical fluid chromatography: Potential application for car lubricant analysis

2012 ◽  
Vol 1270 ◽  
pp. 318-323 ◽  
Author(s):  
Gwenaelle Lavison-Bompard ◽  
Fabrice Bertoncini ◽  
Didier Thiébaut ◽  
Jean-François Beziau ◽  
Bernadette Carrazé ◽  
...  
Keyword(s):  
Supercritical Fluid ◽  
Supercritical Fluid Chromatography ◽  
Potential Application ◽  
Lubricant Analysis

Control of Activity of Aircraft Engines by Analysis of Wear Debris Particles in Terms of Shape and Size

2015 ◽  
Vol 18 ◽  
pp. 136-143 ◽  
Author(s):  
Janka Mihalčová ◽  
Miroslav Rimár
Keyword(s):  
Mechanical System ◽  
Wear Debris ◽  
Aircraft Engine ◽  
Particle Analysis ◽  
Lubrication System ◽  
Aircraft Engines ◽  
Automated Method ◽  
Debris Particles ◽  
Lubricant Analysis ◽  
Shape And Size

The contribution deals with use of semi-automated method of magnetic separation of particles in order to control mechanical system of aircraft engines. There are three levels of machine wear characterized by means of wear debris particle analysis in the lubrication system of aircraft engines. The shape and size of wear debris particles formed due to machine wear arise immediately in case of wear change thus this method is extremely suitable to control mechanical system washed by lubricant. Analysis of actual samples of lubricating oils containing several types of wear debris at the same time resulted in finding out and characterizing the levels of wear, from standard up to critical one. The contribution describes typical types of aircraft engine lubrication system wear with allocation of the wear level to particular pictures of wear debris particles.

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