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NPL Academy 2016
Impulse ExcitationJoshua BayfieldEmily Mason
Welcome to the National Physical Laboratory
Impulse Excitation
Welcome to the National Physical Laboratory
Joshua BayfieldEmily Mason
IMPULSE EXCITATION
The next morning…
The calculations
Modulus of Elasticity
We first found the density from the mass and volume of the bars.
We used three different methods to find out the Modulus of Elasticity.
We were over 99% accurate to the actual value, which is around 70GPa (Giga-Pascals)
The three methods we used were:• The value from the length, density, frequency and
thickness• The graph slope, thickness and density• The density, frequency and length on a bar which was
hit from it’s side (instead of in the middle).
But – confusion set in…
And then…
WATER ROCKETS
Acknowledgements
Thank you to John Nunn for hosting us this week.