Katowice, 20.06.2019 r. MSc. Łukasz Kuczyński
Faculty of Transport
Silesian University of Technology
Abstract of PhD dissertation entitled
"Vibroactivity of gearbox housing made of selected
composite materials"
In the PhD dissertation, identification studies were undertaken on the use of composite materials in the construction of the gearbox housing, as an alternative to commonly used materials. It was assumed that as part of own research, the possibilities of using three different composite materials for the construction of the gearbox housing will be examined and analyzed. The main aim of the dissertation is to analyze the impact of these materials on vibroactivity and housing mass, while maintaining the same geometric dimensions of the generated models.
The research and analyses carried out in the study show that it is possible to make composite gearbox housings from various materials. The developed method of combining composite housings with inserts of bearing hubs made of steel enables performing laboratory tests of new material solutions for housings. The use of selected composite materials allows reducing the weight of the housing in relation to the steel housing by at least 60%.
The modal analysis of free-hanging housings mounted on a laboratory bench showed that the composite bodies are characterized by the occurrence of resonance frequencies in lower frequency ranges, while in the higher ranges they dampen vibration much better than the steel housing. The performed tests of vibroactivity at various constant rotational speeds of the gear allow drawing the conclusion that composite housings are less sensitive to changes in the rotational speed of the gear than the steel housing. Tests have shown that in higher ranges of rotational speed, gearbox housings made of composite materials have a comparable or lower level of vibration. The tests and analyses of vibroactivity of the gearbox housing carried
out at various gear loads allow affirming that composite housings are less sensitive to a load change than the steel housing.
The scope of the PhD dissertation, as well as the research and analysis of the results have confirmed the validity of the theses adopted therein.
