An Experimental Study of Traction Characteristics for a Family of Transmission Fluids
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Mechanical and Aerospace Engineering Honors Theses; 2020
Efficiency of transmissions used in ground vehicles is a major research topic in automotive industry, aiming at increasing the travel distance and life of hybrid or electric vehicles. Any achievable reductions in power losses of the transmission results directly in improved fuel economy or battery driving range for a typical internal combustion engine or electric vehicle, respectively. As such, establishing friction characteristics of transmissions fluid empirically becomes critical for conducting direct comparisons between different fluids. These friction measurements can be regressed into friction formulae to be used in simplified power loss prediction models, while also providing much needed data for validation of more advanced tribology models. In this study, a methodology is proposed to perform tightly controlled traction measurements of lubricated contacts of a two-disk tribometer setup. This methodology is applied to three candidate transmission fluids identified for a high-speed automotive application to provide a comparison amongst them. Traction curves are generated for each lubricant covering wide ranges of contact parameters including rolling and sliding velocities, normal force, and oil inlet temperature. Finally, these curves are regressed to derive closed-form friction formulae for each lubricant as a function of the same parameters.
Academic Major: Mechanical Engineering
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