Energy Considerations If we take PDA measurements….

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Presentation transcript:

Energy Considerations If we take PDA measurements….

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

…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)

Statistical Summaries Transferred energy ratios at End of Driving

Statistical Summaries Transferred energy ratios at End of Driving

Statistical Summaries Transferred energy ratios at End of Driving

Statistical Summaries Transferred energy ratios at End of Driving

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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