Investigating modal requirements for vibration isolation in driveline installations: A parametric study of the correlation between modal quantities and dynamic response
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Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Applied mechanics (MPAME), MSc
Publicerad
2023
Författare
Blom, Linn
Hallberg, Oscar
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The Performance and Driveability team at Volvo Cars Corporations works to ensure a
smooth and comfort ride for the vehicle occupants. This includes to isolate longitudinal
vibrations that can be perceived as disturbing. This thesis focuses on finding a modal
requirement on the engine set-up that can declare the time domain performance regarding
vibration isolation. A parametric study has been conducted to see how deviations in
parameter values affect the performance of the driveline configuration. This was done
with the Latin Hypercube Sampling method to generate designs that was simulated in
Adams View. From Adams, modal data and time domain data were obtained and the performance
was evaluated by using the vibration dose value in the longitudinal direction,
which is known to be a good measurement of comfort in vehicles.
Modal kinetic energy and participation factors are shown to be good measurements of
the coupling between eigenmodes, and their different terms are tried as modal requirement.
No definitive value was obtained but an idea is that a combination of different
modal terms could perform well regarding correlation. The parametric study shows that
inertia properties heavily influence the performance of the engine set-up and that a well
performing set-up is less sensitive to variations than a worse performing one. In addition,
this thesis work has provided a framework for modal analysis that can be used by Volvo
Cars Corporations in further research within this subject or for other purposes.
Beskrivning
Ämne/nyckelord
Vibration isolation , Driveline installation , Modal kinetic energy , Participation factor , Modal analysis , Adams View , Rigid body dynamics , Spearman’s rank correlation