Upload
ashley-samules
View
574
Download
0
Embed Size (px)
Citation preview
Design of a motorcycle swing arm/suspension systemAshley ThorneBsc (Hons) applied technology project.Staffordshire uniiversity_2013
Project Aims and objectives
• To attain and apply a understanding of the working principles of motorcycle suspension systems.
• To develop an applicable solution using CAD software (Creo parametric 2.0)
• To apply Material/joining selection in accord with FEA(Creo simulate 2.0) studies to evaluate and develop the structural profile of the system.
• To implement multi-body dynamics studies(Msc Adams) to simulate vehicle operation and obtain data relating to system performance .
Project methodology Re-design
Synthesis of results
data Design validation and virtual testing
Concept generation
Problem definition/motivation
Research
Design concepts
FEA Loads and constraints
Pivot one
Fixed
Pivot two
Fixed
Pivot three
Loaded
Material selection
Function: Support bending and torsion loads
Constraints: Dimensions of length and width Must accommodate packaging requirements.
Objectives: Minimise mass: Optimise lateral and torsional stiffness
Free variables: Cross sectional area, choice of material.
Additional consideration Joinability/ fabrication
Selected material :Aluminium, 6061, wrought, T6
FEA results and implicationsLongitudinal loading Torsional loading
Max loading case approximated by considering vehicle and rider masses hitting a bump while the entire mass is balanced on the rear wheel (wheelie).
Max loading case calculated by calculating leverage produced by the height of the wheel and tyre in addition to the width of the swing arm as a product of the maximum theoretical tyre force generated.
MBD Results and implicationsThe final model was
comprised of
• 6 Degrees of freedom• 14 Moving Parts (not
including ground)• 2 Cylindrical Joints• 1 Planar Joints• 6 Revolute Joints• 2 Translational Joints• 5 Fixed Joints
The multibody dynamics analysis took the form of the following simulations•Drop tests
•Bump tests •Effects of bump frequency on vertical displacement of the wheel and frame
MBD Results and implicationsBelow is shown the results of a bump frequency simulation, imitating what is know in industry as a two poster rig and is used to simulate many operating condition relating to the suspension system.
Synthesis
• Is the design Feasible ?
• Has the systems performance been tested sufficiently to justify application?
• Are results valid?
• Identify areas where simulation/analysis procedure can be improved!
Conclusion and recommendations
• Increase in the accuracy of the FEA model will produce more reliable results.
•Increase in the complexity of the multibody model would allow for a greater range of operating conditions to be observed
•Virtual results should be backed up by real world test data
Acknowledgements
• Many thanks to all who contributed to the completion of this project and gave assistance throughout the course of study.
Professor David Cheshire Chris smout Alex Heaton
Staffordshire university
Thanks for listening !
Any questions?