The effect of active forces on Wheel Suspension Kinematic Design parameters
Typ
Examensarbete för masterexamen
Program
Automotive engineering (MPAUT), MSc
Publicerad
2020
Författare
Reddy, Chintalapudi Adithya
Venkatesh, Manikanta
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
For passenger cars, passive suspension systems are designed to adapt to a wide
range of driving conditions and hence, vehicle suspension design is associated with
certain trade-offs between several vehicle attributes (ride comfort and road holding,
to name one). Active suspensions however, gives the potential to minimise some of
these trade-offs while still being able to adapt to almost all driving conditions.
This master thesis work aims at studying the effects of active spring and active
damper forces on suspension kinematic parameters through full vehicle simulations.
Further, possible modifications to the suspension geometry such as removing antiroll
bar component, having a zero anti-geometry (anti-lift, anti-dive and anti-squat)
for front and rear suspension and changes to the suspension kinematic targets in the
presence of active forces are also investigated.
The methodology adapted in the thesis work is an iterative process of comparing the
performance of active suspension performance against the passive suspension baseline.
This "baseline" performance of the passive suspension system is established
by simulating a chosen number of driving maneuvers with a baseline suspension
geometry and setup as that of a current production car. The active forces are then
introduced in the suspension system and the same chosen number of driving maneuvers
are simulated to compare the suspension performance. Further, the third set
of simulations are performed for an active suspension system with varied kinematic
targets and modifications to suspension geometry.
The results from these three sets of simulations are compared, which provides insights
to the possible modifications that can be done to the suspension geometry
in the presence of active forces. The main outcome is the suspension behavioral
patterns in full vehicle simulations with active suspension, with varying parameters
of suspension design. The report also details about the results from the driving
simulator which are correlated to the simulation results. A case study is discussed
in detail towards the final chapters, regarding the effect of active damping forces on
vehicle steering demands.
Beskrivning
Ämne/nyckelord
active suspension , vehicle attributes , full vehicle simulations , varied kinematic targets