| 摘要 |
<p>In the representative embodiments of the present invention described herein, new and improved methods and apparatus are disclosed for measuring various forces acting on an intermediate body between the lower end of a drill string (11) and the earth-boring apparatus (14) coupled thereto whereby the magnitudes and angular directions of bending moments and side forces acting on the earth-boring apparatus (14) can be readily determined so that predictions can be made of the future course of excavation of the apparatus.</p> |
