State of Aircraft Turboshaft Engines by Means of Tribotechnical Diagnostic

2018 ◽  
Vol 35 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Janka Mihalčová
Keyword(s):  
Chemical Elements ◽  
Friction Pair ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Rotating Disc ◽  
Quantitative Characterization ◽  
Qualitative And Quantitative ◽  
Friction Regime

AbstractThe contribution describes concrete example of application of tribotechnical methods for the determination of the bearing wear state in aircraft turboshaft engines. Tribotechnical methods, which will be mentioned, deal with qualitative and quantitative characterization of particles occurred in oil. Here belong method optical emission spectrometry method with rotating disc electrode for determination of chemical elements concentration in oil. Method of optical particles counting for detection of particles distribution according to their scale, determination of their number and ferrographic analysis. Exploitation of these methods make it possible to determine quickly and correctly the friction regime and wearing of friction pair that is washed by oil in observed engines.

Using Atomic Spectrometry and Volumetry Method for Determination of Bearing Corrosion in Tribotechnical Diagnostics of Engines

2014 ◽  
Vol 616 ◽  
pp. 110-117 ◽  
Author(s):  
Janka Mihalčová
Keyword(s):  
Reference Material ◽  
Water Content ◽  
Chemical Elements ◽  
Optical Emission ◽  
Atomic Spectrometry ◽  
Lubricating Oil ◽  
Emission Spectrometry ◽  
Rotating Disc ◽  
Karl Fischer

The presence of water in the engine lubrication system is supposed to be a significant factor, which causes engine corrosion. Atomic spectrometry method and method for water content determination were applied for the detection of corrosion. Rotating disc electrode optical emission spectrometry (RD OES) is a method used to determine the concentration of 21 chemical elements in used lubricating oil in 30 seconds. In the used oil the concentration of Fe, Cu and Sn was monitored because these elements are indicators of bearing wear. The elements were analyzed using Conostan S-21 organo metallic calibration standards. The precision of the method was verified by calculating RSD for n = 3, the values of which are for Fe, Cu and Sn less than 7 %. Accuracy of measurement was verified by measuring standard reference material NIST 1084a. Karl Fischer volumetric method was used for the determination of water content in used lubricating oils with precision less than 1 %. The obtained reference material 34849 HYDRANAL-Water Standard 10.0, which is traceable to NIST SRM 2890 for determination of water content by Karl Fischer method, was analyzed for accuracy purposes.

Tribotechnical Diagnosis in Aircraft Engine Practice

2013 ◽  
Vol 308 ◽  
pp. 57-62 ◽  
Author(s):  
Janka Mihalčová
Keyword(s):  
Chemical Properties ◽  
Optical Emission ◽  
Aircraft Engine ◽  
Degradation Process ◽  
Emission Spectrometry ◽  
Infrared Spectrometry ◽  
Wear Particles ◽  
Rotating Disc ◽  
Large Particles

The article deals with the assessment of lubricants properties, monitoring of behaviour and consequences of the lubricant degradation process during its work in the machine lubrication system of aircraft engine by using tribotechnical diagnosis. To be used four methods for qualitative and quantitative determination of large particles, which were found in oil during operation. Concentration of elements was determined by optical emission spectrometry with rotating disc electrode (RD OES) application, categorization of particles by dimension and quantity was performed by method of optical shading. By used of ferrographic analysis was studied morphology of wear particles and physic-chemical properties of oil were determined with Fourier transform infrared spectrometry (FTIR).

X-ray photoelectron spectroscopy characterization of aerosol particles in Antarctica

2015 ◽  
Vol 27 (5) ◽  
pp. 493-499 ◽  
Author(s):  
Simona Rella ◽  
Cosimino Malitesta
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Chemical Elements ◽  
Aerosol Particles ◽  
Qualitative And Quantitative Analysis ◽  
Surface Enrichment ◽  
X Ray ◽  
Qualitative And Quantitative

AbstractQualitative and quantitative analysis of surface species on size-segregated atmospheric particulate collected in Antarctica during the 2010–11 summer was performed by X-ray photoelectron spectroscopy (XPS). This represents the first example of surface characterization of Antarctic aerosols. The size class with particle cut-off diameter of 3 μm was richest in terms of chemical elements. Peculiar findings of the application included detection of Ca (possibly surface-segregated) and surface enrichment of Mg. The determination of nitrate, ammonium and sulphate species on collection filters provides evidence for a possible advantage of XPS over more laborious techniques (e.g. ion chromatography). The presence of these species is in reasonable agreement with other recent reports from Antarctica.

An on-line matrix separation and preconcentration procedure for ICP-OES determination of Cd, Co, Cu, Mn and Pb traces in Zr and Zr-Nb alloys using a cation-exchange resin microcolumn

2021 ◽  
Author(s):  
Masoud Aghahoseini ◽  
Gholamhassan Azimi ◽  
M. K. Amini
Keyword(s):  
Inductively Coupled Plasma ◽  
Cation Exchange Resin ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Separation And Preconcentration ◽  
On Line ◽  
Plasma Optical Emission Spectrometry

Determination of traces of Cd, Co, Cu, Mn and Pb elements in zirconium and its alloys by inductively coupled plasma optical emission spectrometry (ICP OES) suffers from severe spectral interferences...

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