| 摘要 |
<p>A method and drilling apparatus to adjust the pulse shape, transmitting impact energy produced by piston (24) on the drill bit, is adjusted close to a pulse shape best absorbed by the drilling object (3) from the bit or a corresponding drill rod (1). The energy pulse moving from piston to drill rod is shaped to grow as a function of time into a stress pulse by adjusting the piston construction to grow backward from its impact surface as to its diameter (8a-d) or to increase as to its mass concentrations.</p> |
