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.