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Energy Considerations If we take PDA measurements….

Published byEmilie Levick Modified over 9 years ago

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Presentation on theme: "Energy Considerations If we take PDA measurements…."— Presentation transcript:

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2 Energy Considerations If we take PDA measurements….

3 Energy Concepts Potential EnergyPotential Energy Rated EnergyRated Energy Kinetic Energy (Hammer Efficiency)Kinetic Energy (Hammer Efficiency) Transferred Energy (ENTHRU)Transferred Energy (ENTHRU)

4 …we can calculate the Transferred Energy WRWRWRWR h E R = W R h Manufacturer’s Rating WRWRWRWR Max E T = ∫F(t) v(t) dt (ENTHRU) η T =  ENTHRU/ E R (transfer ratio or efficiency) Measure Force, F(t) Velocity, v(t)

5 Statistical Summaries Transferred energy ratios at End of Driving

6 Statistical Summaries Transferred energy ratios at End of Driving

7 Statistical Summaries Transferred energy ratios at End of Driving

8 Statistical Summaries Transferred energy ratios at End of Driving

9 Energy Three types of energy: Potential or rated energy (mgh) Friction inside hammer Inclination Kinetic or impact energy (mv 2 /2) Hammer cushion Helmet Pile cushion Transferred energy or ENTHRU (PDA) Pile length Resistance

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