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The wear tribometer and digitalization of tribological tests data

Zdravecká E., Ondáč M., Tkáčová J.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 61, nr 2

321--326

Purpose: The article deals with the modernization of the Amsler experimental machine. Modernization includes implementation of sensors for measuring the friction moment, the normal load and temperature; application of electronic components for measurement and graphical evaluation of tribological data. Design/methodology/approach: In order to reach the goals further actions were provided: • Substitution and elimination of mechanical measuring unit with sensors and application of MATLAB/Simulink, • Implementation of computer for data processing and analyzing. Findings: Records of tribological parameters were digitized using data acquisition card with MATLAB/Simulink and saved to a file processed in Matlab and transferred again to Simulink. To filter the records, the simulation scheme was designed in which low-pass filter was proposed by instrument FDA to monitor changes in the tribological characteristics. Applied modernization enables the increase of precision and effectiveness of measurements e.g. measurement of friction coefficient and temperature of lubricant and contacting tribopairs in the conditions of determined load. To change the sliding velocity the speed frequency converter was designed and connected. Research limitations/implications: Analyzed modernization of the machine refers to pin on disc, disc-disc, block and disc unit sliding friction processes. Practical implications: The possibilities of data processing and preserving in tribological research. Originality/value: Designed and structurally modernized measuring system of the Amsler tribometer should ensure continuous recording of tribological characteristics in required output. Results of this research can be used for study of contact fatigue and properties of lubricant, especially on friction pairs systems, sliding friction models, in extend given: • Selection of materials for friction pair elements, • Analysis of research on friction and materials under sliding and wear processes, • Lubricant selection for specified tribological system.