Winner Discover Sensors Award Waterford Inst. Of Tech. 2010.
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Transcript of Winner Discover Sensors Award Waterford Inst. Of Tech. 2010.
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Winner Discover Sensors Award
Waterford Inst. Of Tech. 2010
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Dungarvan CBS
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Philip Coffey, Gary Hurley, Joseph FoleyTeacher
Mr. Eanna McGrath
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Look at what forces can do to a bridge.
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What Is a Newton?
A Newton is the unit of measurement for a
Force
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What Is One Newton?
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1 apple=
1 Newton
Joseph shows that
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Forces in Pairs
Newton’s Third Law
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Newton’s third law states that every
action has an equal and opposite reaction
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Philip demonstrates this law using
two force sensors to
measure the forces acting in
opposite directions upon an elastic band.
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Now to our bridge
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But First,What are many bridges built from?
I beams
But why I beamsWhy not Box section for example?
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I beams are used because they are strong and can resist tension, compression and torsion forces. However they are lighter and cheaper than box
section.
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And that’s why I beams are used
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We are investigating the forces acting on various
parts of our bridge as a car travels across it
To do this we use four load cells on the bridge connected to a laptop.
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Load Cells
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Typical forces on the bridge.
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What can affect the forces acting on the bridge?
What about a pothole?
To demonstrate how a pothole can affect the forces on a bridge.
A force plate is used. Gary applies a force by jumping on it.
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As you can see by the spike the force acting on the force plate is almost quadrupled when Gary crashes
back down.
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Now we must simulate a pothole on our bridge.
We use an elastic band over the road to simulate this
situation.
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Typical forces on the bridge with a
pothole
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Now look at the difference between the two graphs
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Without the pothole
With the pothole
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WithWithout
Comparing the graphs without and with a pothole.
Large Spike Caused By Pothole
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Imagine the advantages sensor technology offers to engineers in building bridge prototypes and
testing new designs.
This enables them to research and anticipate forces on a bridge.
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Avoiding potholes in the world of
construction...
...is just as important as avoiding
bunkers in the world of golf.
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As Gary says “The stresses involved in both are often the
same”.