Virtuell modell av växellåda för visuell kartläggning av interna processer- Framtagning av utrustning för framtida studier inom optimering av verkningsgrad
2019
The background of this Bachelor Thesis is optimizing the efficiency in gearboxes
by studying friction and distribution of lubricant in a gearbox. The motive for researching
this field is the increasing demand for sustainability and reduced carbon
dioxide emissions, which can be related to the efficiency of gearboxes. The aim of
our Bachelor Thesis is to instigate further scientific research about optimizing the
drivline by providing information regarding how to construct a gearbox which can
serve as a fundament for further research. In other words, mapping the activities
required for constructing a gearbox. After discussing with CEVT and several
postgraduates, a requirement specification was established listing all the needs and
desires regarding the study. In order to collect data, a survey was conducted which
examined several formerly established gearboxes. The information was then used
as references and inspiration for the shaping of our final design. Worth mentioning
is that the gearbox will be driven without any load except for the load produced
by the lubricant. Having conducted several different design evaluations, it was decided
to construct a transparent gearbox in order to maximize the visualization of
the ongoing internal processes of the gearbox i.e. the distribution of lubricant on
the gears.
The study then continues by determining compatible dimensions of the gearbox
components e.g. gears, walls etc. This was done by creating a virtual model in
the software Catia v5, setting the adequate constraints and finally running kinematic
simulations using the DMU Kinematics function found in Catia. Once the
design and dimensions had been defined, the following step was determining which
material to use for realizing the virtual model. Using the software CES EduPack
along with the requirement specification, the polymer material polycarbonate was
selected to use for the walls due to its satisfying mechanical properties, termal
properties and properties for processing.
The study resulted in a virtual model, derived from the defined constraints and
criterias, along with detailed information regarding the design process. Since the
initial purpose was to provide information and mapping of the activities needed
to construct the gearbox, the study achieved its original objective. Moreover, the
simulations of the virtual model demonstrate that a physical prototype would
function in reality. The Thesis finishes with a discussion on how the construction
process was conducted, underlying causes and alternative approaches to certain
activities. The study also ends with a conclusion and the authors’ input regarding
future research.
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