Understanding football boot traction requirements

Centre for Sports Engineering Research
Understanding football boot traction
requirements through high-speed video
analysis
Heather Driscoll
SportSURF Traction Workshop – 15th June 2011
Background

PhD – “Testing methodologies in football boot outsole design”

Identify realistic testing conditions
Select an analysis method
Develop method into a player
movement analysis protocol
Analyse obtained data to extract
accurate and useful foot-tosurface loading conditions
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Methodology
Field of view
x
y
Running direction
Camera 2
(right)
Camera 1 (left)
Left camera
Right camera
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Methodology
x
z
y
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Marker location
P2
P4
P5
P1
P3
Forefoot
Rear-foot
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Automated tracking
1
x
2
Crop
Threshold
& label
Select marker
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Data collection

Doncaster Rovers FC training ground, October 2010

8 youth team players

Copa Mundial football boots

3 movements:
– Acceleration phase of sprinting
– 45o lateral side-cut
– Long range kick (filming planted foot)

5 repeats of each movement

Ground condition – midrange (FIFA ball bounce)
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Visualisation and Informatics

Stud transposition
P2
P4
P5
P3
P1
S2 ×
×
S1
S3
×
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Visualisation and Informatics

Stud transposition

Euler angle (orientation)
x
z
y
y

z


x
PITCH
YAW
ROLL
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Visualisation and Informatics

Stud transposition

Euler angle (orientation)

Centre of rotation (2D)
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Visualisation and Informatics

Stud transposition

Euler angle (orientation)

Centre of rotation (2D)

Helical screw axis (3D)
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Example results
Displacement (mm)
100
50
0
-0.05
0
0.05
0.1
0.15
0.2
P1
z
P1
y
-50
Video
-100
0.25
Time (s)
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Conclusions and future work

Player testing protocol for laboratory and outside.

Can track shoe position through 3 movements.

Can deduce shoe position, orientation and velocity.

Identify time requiring highest traction.

Is there a simple movement that can be easily replicated?

How do the results relate to current traction testing protocol?

What suggestions can be made to improve realism of testing?
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Long term goals
Player
testing
Prototype
Design
cycle
Traction
testing
FE model
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Thank you for listening
Acknowledgements: Thank you to adidas for sponsoring the research.
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