SIMPACK User Meeting Simulation of Advanced Chassis ... · PDF fileSimulation of Advanced...
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
SIMPACK User Meeting Baden-Baden 2006
Simulation of Advanced Chassis Concepts for Motorcycles and Racing Cars
Basileios MavroudakisInstitute of Numerical and Computational Mechanics
University of Stuttgart
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Overview
motorcycle dynamics
simulation in motorcycle dynamics, alternative approaches to motorcycle design,
front supension systems, mechatronics
race car dynamics
passive mode decoupling suspensionroll elimination by use of gyro dynamicssimulation of advanced chassis concepts
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Alternative Front Suspension systems
why use them?inefficiency of the telescopic forks: stiction, excessive weight transfer, high weight and inertia moments limited geometry tuning abilities
general advantages of AFS:unsprung weight reduction,superior dynamical behavior, higher geometry parameters range,direction of road forces towards theframe center
…disadvantages:higher complexity in design andtuning of the steering geometry,may require different rider approach
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Simulations: AFSS vs. Conventional Forks
resulting loads and magnitude of load change much greater in case ofconventional forks are
much lower pitch angle variationsunder braking-acceleration excessive load transfer inconventional forks
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Active Roll Control
placed in tandem counter-rotating example of vehicle sustaining mid-bend bump
manipulation of the roll angle through application of roll torque by use of Control Moment Gyros
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Conventional Passive Suspensions
pushrods &rockers
lin. / rot. spring-damper
anti-roll bar
third spring-damper
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Mode Decoupling Suspension System
hydraulic interconnections
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Decoupled Modes
bounce mode
pitch mode
warp mode
roll mode
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
riding over a kerb in chicane
both vehicles at 80m/s, kerb simulated as sinusoidal obstacle
decoupled suspension
conventional suspensionoverly stiff and underdamped roll and warp
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
Handling Limitationsboth vehicles at 65m/s
conventional suspensionhigh rear pitch frequency
decoupled suspension
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Institute of Engineering and Computational Mechanics
University of Stuttgart, GermanyProf. Dr.-Ing. Peter Eberhard
riding over a kerb in chicane, results
The vehicle equipped with the mode decoupling suspension system presents vastly superior body control due to high pitch and roll damping, yet due to the soft warp rides smoothly over the kerb.