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Published byEmilie Levick Modified over 3 years ago

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Energy Considerations If we take PDA measurements….

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

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…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)

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Statistical Summaries Transferred energy ratios at End of Driving

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Statistical Summaries Transferred energy ratios at End of Driving

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Statistical Summaries Transferred energy ratios at End of Driving

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Statistical Summaries Transferred energy ratios at End of Driving

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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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