MTB Toolbox (Analysis MTB) - Dipartimento d`Ingegneria

Department of Engineering
Machine Design Research Group
University of Perugia
“Development of a toolbox for the modeling and
simulation of mountain bikes”
Dipartimento di Ingegneria Industriale, Università degli Studi di Perugia
Via G. Duranti 67, 06125 Perugia, Italy
E-mail: [email protected]
Development of a toolbox for the modelling and simulation of mountain bikes
Machine Design Research Group
C. Braccesi, F. Cianetti, L. Landi
Machine Design
Machine Design
M. Chiarini, L. Tomassini, S. Baglioni
E-mail:
[email protected]
Webpage: www.caedii.unipg.it
Development of a toolbox for the modelling and simulation of mountain bikes
Research Aim
Making a tool used in the field of Virtual Prototyping, able to allow engineers and designers to
evaluate the kinematic and dynamic behavior of rigid, front suspended and full suspended
bikes model.
ADAMS/View as the multibody development environment
Capabilities
Automatic and parametric modeling of rigid, front suspended and full suspended (capability
of modeling frame components both as rigid and flexible)
Tire modeling (friction modeling)
Suspension full modeling (damping and stiffness, linear or non-linear)
Braking system modeling, with cantilever and disc typologies
Biker modeling with lumped parameters, pedaling modeling (by the spline expressed in terms
of torque exerted vs. pedaling frequency) and reaction times modeling during braking
Aerodynamic forces modeling
Kinematic analysis
Dynamic analysis on test rig with ground motion generated or analytically or imported from
external file (it is possible to simulate motion conditions with constant slope and fixed ratio)
Dynamic analysis on 3D ground with the capability to simulate a full track in variable
ascending and descending conditions (motion conditions with fixed ratio)
Ascending speed control by automatic modulation of the torque in function of the motion
condition
Descending speed control by controlled braking system action in function of the motion
condition
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox
Design
MTB
Analysis
MTB
MTB
Edit
The toolbox, built inside ADAMS/View multibody simulation environment, is divided into
three sections that, by macros, allow to parametrically create bike models, to choice the
analyses to be conducted and eventually motion conditions that have to be imposed.
Automatically all significant results are saved both numerically and in a graphic form
Development of a toolbox for the modelling and simulation of mountain bikes
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MTB Toolbox (Design MTB)
Bike
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Virtual Bike
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Design MTB)
Flow-chart of the
“Design Toolbox”
Design MTB
Rigid
Hard Tail
Monopivot
Horst Link
Main Frame
Main Frame
Main Frame
Main Frame
Fork
Fork
Swingarm
Upper Link
Wheels
Damper
Fork
Chainstays
Wheels
Damper
Rear link
Wheels
Fork
At this level the bike typology is choose and
for this typology a specific model could be
choose among predefined ones (ie. Orbea,
Cannondale, Giant, Meriva, ...)
N.B. Structural components could be rigid
(wireframed or imported by CAD) or flexible
(modelled with modal approach into FE
codes)
Damper
Wheels
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Design MTB)
Example of a Bike modeling with rigid components and swing arm flexible
Development of a toolbox for the modelling and simulation of mountain bikes
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MTB Toolbox (Analysis MTB)
Virtual Bike
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Results
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Flow-chart of the
“Analysis Toolbox”
Analysis MTB
Downhill
Hill
Road 3D
Rim brake
Disc brake
At this level the braking system typology is
choose and then is defined
N.B. Dynamic analysis are “Downhill”, “Hill”
and “Road 3D”. First two conducted on test
rig and the third on virtual real road.
Kinematic
Brake input
Man input
Track input
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Example of kinematic analysis
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Example of dynamic analysis on test rig
(constant slope and road roughness profiles externally loaded)
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Example of dynamic analysis on test rig
(constant slope and road roughness profiles externally loaded)
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Example of dynamic analysis on road
(variable altimetric profile and road roughness profiles externally loaded)
Development of a toolbox for the modelling and simulation of mountain bikes
MTB Toolbox (Analysis MTB)
Example of dynamic analysis on road
(variable altimetric profile and road roughness profiles externally loaded)
Development of a toolbox for the modelling and simulation of mountain bikes
Components Durability (Test Case)
Research activity – Mountain Bike Design and Durability
MTB Toolbox
Post Processing – Stress Recovery
MTB Toolbox Hierarchy
Flexible body
MultibodyMBS/Flex
model Model
Development of a toolbox for the modelling and simulation of mountain bikes
Components Durability (Test Case)
Research activity – Mountain Bike Design and Durability
Development of a toolbox for the modelling and simulation of mountain bikes