Objective tuning of semi-active dampers: Method development for ride metric optimisation utilizing a four poster rig
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Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Mobility engineering (MPMOB), MSc
Publicerad
2023
Författare
Ramsberg, Jesper
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
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Sammanfattning
Active systems in premium passenger cars are gaining popularity which in turn leads
to higher demands on these systems to perform. One such system are semi-active
dampers which can replace passive dampers and is a big part in how the suspension
performs. Traditionally, semi-active dampers are tuned by experienced engineers
with focus on subjective assessment and understanding of vehicle dynamics. Test
driving and analysing data lets the engineers tune the specific system to a desired
functionality. To achieve an overall better result for semi-active damper systems it
would be effective to extend the objective capabilities of the tuning process. This is
exactly where this project finds its purpose. This project aims to create a method
that makes it possible to objectively tune semi-active dampers utilizing a four poster
rig. Focus was on primary ride comfort, looking at the level of damper control and
ride abruptness. To do so a metric for primary ride control was found and validated
on the four poster rig. Optimisation of semi-active damper parameters was investigated
in CAE and transferred to the four poster rig. A complete vehicle was setup
on the rig and the semi-active damper ECU was connected to a laptop. The laptop
measured and updated the vehicle according to patternsearch optimisation while
the vehicle got excited by a recorded. Different target functions and initial guesses
were investigated, which resulted in three interesting outcomes. The optimisation
worked well on the rig and it ran continuously without human input. To conclude
the project, a metric was found and validated and an objective tuning method was
found. With that conclusion the aim of the project was satisfied.
Beskrivning
Ämne/nyckelord
Semi-active , damper , tuning , subjective , objective , four , poster , rig , active , systems , primary , ride , control , abruptness