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EHTC 2010
MF-Swift: A tire model for handling, ride comfort,
durability and control applications
EHTC 2010
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EHTC 2010 2
Contents
• TNO Delft-Tyre toolchain
• MF-Swift:
• Intended range of application
• Concept
• Unique advantages
• Availability
• Application example
• Conclusions
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EHTC 2010 3
TNO Delft-Tyre toolchain
Measurement Identification Simulation
parameter fitting
+
database
MF-Tool
TYDEX files
tyre
property
file
tyre model
MF-Tyre
MF-Swift
MBS
solver
tyre testing
signal
processing
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EHTC 2010 4
MF-Swift
TNO is the original developer of MF-Tyre:
• Empirical model based on Pacejka’s Magic Formula
• Single point tyre to road contact
• Used for vehicle handling:
• Step steer, slalom, sine steer, j-turn
• Smooth road surfaces
• Applicable for both passenger car as well as motorcycle tyres
MF-Swift is an extension of MF-Tyre with:
• An advanced road contact/enveloping model
• Representation of tyre dynamics
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EHTC 2010 5
MF-Swift Intended range of application
• Vehicle behaviour on uneven roads:
• ride comfort analyses
• durability load calculations (fatigue spectra and load cases)
• Simulations in which control systems are involved that can excite
tyre dynamics, e.g. ABS, ESP, etc.
• Analysis of drive line vibrations
• Analysis of shimmy vibrations; these vibrations typically have a
frequency in the range of 10-25 Hz.
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EHTC 2010 6
MF-Swift Advanced road contact model
cam
cam
ls
wheel
centre
w -y
F
cam
cam
ls
• Elliptical cams represent tyre contour
• Enveloping model output is effective road surface with:
• 2D: height, forward slope, road curvature
• 3D: road banking/camber
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EHTC 2010 7
MF-Swift Tyre dynamics
• Primary/first eigenmodes of the a passenger car tyre:
• below 60 to100 Hz tread band may still be considered as a rigid
body, e.g.:
• truck tyre < 60 Hz
• passenger car tyre < 100 Hz
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EHTC 2010 8
MF-Swift Tyre dynamics
Rigid ring (6 DOF)
Enveloping model with elliptical cams
Effective road plane
Sidewall stiffness& dampingRim
Residualstiffness &damping
Slip model
Cleat
Effective road surface
Contact patch dimens oi ns
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EHTC 2010 9
Unique advantages MF-Tyre/MF-Swift
• MF-Tyre has unique features and is available free of charge in
the major simulation packages
• MF-Swift is an extension of MF-Tyre:
• One tyre model for all applications
• Little extra measurements required
• Older MF-Tyre datasets can be ‘upgraded’ to MF-Swift
• MF-Swift only has 6 degrees of freedom computationally
efficient
• MF-Tool provides stand alone (independent) parameter fitting
possibilities
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EHTC 2010 10
MF-Tyre/MF-Swift availability
Under construction:
CarSim
BikeSim
TruckSim
Available:
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EHTC 2010 11
MF-Swift application example
Durability load calculation at Nissan, Japan
• OpenCRG file
• 4x4 mm grid size
• binary, 273 MB
• Adams model
• flexible bodies
• MF-Swift 6.1.2
• durability road
• digitised 4x4 mm grid
• 9.7 GB
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EHTC 2010 12
MF-Swift application example
Example: uneven road simulation
Comparison vertical force on vehicle body
PSD
Frequency [Hz]
Test Adams
Time [s]
Forc
e [
N]
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EHTC 2010 13
MF-Swift application example
Example: uneven road simulation
Comparison longitudinal force on vehicle body
PSD
Frequency [Hz]
Test Adams
Time [s]
Forc
e [
N]
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EHTC 2010 14
Concluding remarks
• With Delft-Tyre TNO has developed an integral toolchain for all
tyre modelling needs
• The MF-Tyre/MF-Swift tyre model can be applied for all vehicle
dynamic simulations, ranging from handling to durability
• The MF-Tyre/MF-Swift concept is fast, accurate and requires little
measurements
• The MF-Tyre/MF-Swift models will be available soon in the Altair
program suite