lab#2 bouncing ball supplemental testing experiments and analysis performed by mike krieg
TRANSCRIPT
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Lab#2 Bouncing BallSupplemental Testing
Experiments and analysis performed by Mike Krieg
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Ultra High Speed Video
•High speed video taken using Phantom v4.3 high speed camera
•Video filmed at 1200 fps
•Racquetball dropped from ~3.5ft
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Analysis
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035-1
0
1
2
3
4
5
Time (s)
Po
siti
on
(in
)
Top
BottomGeometric Center
•Video was analyzed frame by frame to extract racquetball positions throughout impact.
•Positions determined for top and bottom of ball (middle taken as average)
•2 independent methods were employed to determine restitution coefficient from position data
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Velocity Method
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035-200
-150
-100
-50
0
50
100
150
200
250
Time (s)
Ve
loc
ity
(in
/s)
sinVimpact 181
sinVreflex 162
impact
reflexvelocity V
Ve
According to the velocity method the coefficient of restitution was determined to be 0.8950
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Ball Deflection Method
0 0.005 0.01 0.015 0.02 0.025 0.03 0.035-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
Time (s)
Ba
ll C
om
pre
ss
ion
(in
)
Coefficient defined by ratio of reaction impulses during impact
tc
t
t
tc
dtR
dtRe
1
2
Reaction forces approximated using Hooke’s Law
tc
t
t
tctc
t
t
tc
dt
dt
dtk
dtke
1
2
1
2
According to the deflection method the coefficient of restitution was determined to be 0.8693