The Measurement-While-Drilling (MWD) system, composed of a tri-axial magnetometer and accelerometer, is widely used in the Horizontal Directional Drilling machine coal mines. This system can provide attitude information each measuring point borehole, which will eventually allow trajectory borehole to be drawn. information, however, showed low-level accuracy, due sensor’s imperfection mounting e...

In this research, finite element analysis of the conventional drilling and vibration assisted drilling is carried out. The ABAQUS software is employed for FE analysis. The Johnson-Cook models for both plastic deformation and damage are employed for FE simulation.The results of the FE analysis are then verified with experimental results in both conventional and vibration assisted drilling on Al ...

Bone fracture due to an accident, aging or diseases is a feature of everyday life. One of the principal methods of repair and reconstruction of such a fracture is based on drilling the bone and fixing its separate parts together using screws, wires and plates. Morphology of the drilled hole surface and fixative components such as screws, pins and hooks influences strength of the bonds between t...