Slide 1

Slide 2 Energy Considerations If we take PDA measurements. Slide 3 Energy Concepts Potential EnergyPotential Energy Rated EnergyRated Energy Kinetic Energy (Hammer Efficiency)Kinetic Energy (Hammer Efficiency) Transferred Energy (ENTHRU)Transferred Energy (ENTHRU) Slide 4 we can calculate the Transferred Energy WRWRWRWR h E R = W R h Manufacturers Rating WRWRWRWR Max E T = F(t) v(t) dt (ENTHRU) T = ENTHRU/ E R (transfer ratio or efficiency) Measure Force, F(t) Velocity, v(t) Slide 5 Statistical Summaries Transferred energy ratios at End of Driving Slide 6 Statistical Summaries Transferred energy ratios at End of Driving Slide 7 Statistical Summaries Transferred energy ratios at End of Driving Slide 8 Statistical Summaries Transferred energy ratios at End of Driving Slide 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