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Torsional vibration analysis of transmission and crankshaft in a hypercar

Sjöbeck, Axel LU (2026) MMEM01 20261
Machine Elements
Abstract
The master’s thesis includes a torsional vibrations analysis of an engine crankshaft and transmission in a hypercar. A torsional model is implemented in order to analyze how excitations produced by the engine affect the vibrational dynamics of the system. This is done by analyzing resonance frequencies and response amplitudes at critical speeds. A frequency-domain driven Python model is built in parallel to a time-domain driven model in the specialized simulation software GT-suite. One of the primary research questions is if the frequency-domain model can produce matching results and if it can reduce the simulation time. Additionally a torsional vibration damper is implemented in order to reduce peak amplitudes. The findings of this thesis... (More)
The master’s thesis includes a torsional vibrations analysis of an engine crankshaft and transmission in a hypercar. A torsional model is implemented in order to analyze how excitations produced by the engine affect the vibrational dynamics of the system. This is done by analyzing resonance frequencies and response amplitudes at critical speeds. A frequency-domain driven Python model is built in parallel to a time-domain driven model in the specialized simulation software GT-suite. One of the primary research questions is if the frequency-domain model can produce matching results and if it can reduce the simulation time. Additionally a torsional vibration damper is implemented in order to reduce peak amplitudes. The findings of this thesis include a reduced solver time compared to the GT counterpart. The two models shows strong structural resemblance with near identical natural frequencies and modal shapes. The frequency based model can consistently match forced vibrational behavior with the GT model. The critical speed amplitude values across the system do not entirely align entirely between the models, but shares the essential amplitude behavior. (Less)
Popular Abstract (Swedish)
Projektet handlar om att studera hur en kraftfull V8 motor med extrem prestanda orsakar
vibrationer i en växellåda och motorns vevaxel. Kraftiga vibrationer kan både skada bilen
och störa föraren. Idén till att studera vibrationerna är att bygga två modeller parallellt: en
analytisk approach med Pythonkod och en med den specialiserade simuleringsmjukvaran
GT-Suite.
Please use this url to cite or link to this publication:
author
Sjöbeck, Axel LU
supervisor
organization
alternative title
Torsionell vibrationsanalys av transmission och vevaxel i en hyperbil
course
MMEM01 20261
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Torsional vibrations, Powertrain dynamics, Lumped parameter model, Frequency response analysis, Engine excitation
other publication id
LUTFD2/(TFME-26)/5048-SE(1-94)
language
English
id
9229710
date added to LUP
2026-06-11 15:11:24
date last changed
2026-06-11 15:11:24
@misc{9229710,
  abstract     = {{The master’s thesis includes a torsional vibrations analysis of an engine crankshaft and transmission in a hypercar. A torsional model is implemented in order to analyze how excitations produced by the engine affect the vibrational dynamics of the system. This is done by analyzing resonance frequencies and response amplitudes at critical speeds. A frequency-domain driven Python model is built in parallel to a time-domain driven model in the specialized simulation software GT-suite. One of the primary research questions is if the frequency-domain model can produce matching results and if it can reduce the simulation time. Additionally a torsional vibration damper is implemented in order to reduce peak amplitudes. The findings of this thesis include a reduced solver time compared to the GT counterpart. The two models shows strong structural resemblance with near identical natural frequencies and modal shapes. The frequency based model can consistently match forced vibrational behavior with the GT model. The critical speed amplitude values across the system do not entirely align entirely between the models, but shares the essential amplitude behavior.}},
  author       = {{Sjöbeck, Axel}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Torsional vibration analysis of transmission and crankshaft in a hypercar}},
  year         = {{2026}},
}