Magnetic mass-lift impulsive seismic energy source including repelling electromagnets and reaction mass damping

摘要

A seismic energy source includes a base plate having a first electromagnet thereon. A reaction mass has a second electromagnet thereon. A switchable current source is connected to the first and second electromagnets such that the first electromagnet repels the second electromagnet. At least one damper is functionally connected between the reaction mass and the base plate. The damper is configured to enable faster movement of the reaction mass away from the base plate than toward the base plate.