Now showing items 1-3 of 3
Numerical simulation of the roller cone drill bit lift-off phenomenon
Rotary drilling with roller cone bit is often accompanied by wide fluctuations of the weight on bit (WOB). In certain cases the WOB periodically reduces to null. It has been postulated that in these cases the bit lifts off ...
Infrared thermography for non-destructive identification of reinforcement in concrete
Infrared thermographic technique is investigated numerically and experimentally to identify reinforcing steel in concrete members. Other non-destructive techniques, such as the ultrasonic technique, are subject to errors ...
Experimental system identification of model frames using frequency-domain and time-domain methods
Two different metal test frames are excited using the impact-hammer method. The force-input and specific acceleration-output time-histories were recorded, and through frequency-domain, and time-domain structural system ...