Results 31 to 40 of about 178,633 (301)
Stick-slip vibration behaviors of BHA and its control method in highly-deviated wells
Alexandria Engineering Journal, 2022 Stick-slip vibration is a common phenomenon met in oil gas drilling, especially in the complex trajectory wells such as highly-deviated wells, it will cause the earlier failure of BHA (bottom hole assembly) and lower drilling efficiency.
Weiji Liu +3 more
doaj +1 more source
Stick–slip in hand guidance of palletizing robot as collaborative robot
International Journal of Advanced Robotic Systems, 2022 Stick–slip is a challenging problem in palletizing robots and constitutes one of the main problems in precision positioning control. This study analyzed the stick–slip of a four-degree-of-freedom ceiling-mounted hand-guiding collaborative robot in a ...
Yun-Ju Chuang +3 more
doaj +1 more source
Observation and modeling of the suction pump effect during rapid dilatant slip [PDF]
, 2003 The temporary pressure drop observed during post-peak dilatant slip in axi-symmetric testing of a porous aeolian sandstone is modeled using a simple function of opening caused by sliding along the fault surface.
Rudnicki, J. W. +3 more
core +1 more source
Journal of Experimental Biology, 2007 ![Figure][1] California spiny lobster ( Panulirus interruptus ), and their relatives have been tormenting fishermen for centuries with their anti-predator rasp; according to Sheila Patek from the University of California, Berkeley, it's an `abrasive, obnoxious, squawking noise'.
openaire +1 more source
Study on Drill String Stick-slip Vibration Pattern Under Bit-Rock Interaction
Shiyou jixie, 2023 Stick-slip vibration leads to high-frequency shear stress on drill string and premature fatigue of drill string.Therefor,the torsional vibration model of drill string system considering bit-rock interaction was built by coupling the bit-rock interaction ...
Xing Xuesong +4 more
doaj
Meikuang Anquan, 2023 For the problem of stick-slip vibration caused by hard rock formation in the process of drill bit penetrating in coal mine, and the discrete element method (DEM) was employed to study the rock cutting performance and stick-slip vibration behavior of PDC ...
Jian CHEN +6 more
doaj +1 more source
Stick-slip singularity of the Giesekus fluid [PDF]
, 2015 The local asymptotic behaviour at the stick-slip singularity is determined for the Giesekus fluid in the presence of a solvent viscosity. In planar steady flow, the method of matched asymptotic expansions is used to show that it comprises a three region ...
Evans, Jonathan
core +1 more source
Study of the influences of rotary table speed on stick-slip vibration of the drilling system
Petroleum, 2015 Stick-slip vibration presents one of the major causes of drilling problems, such as premature tool failures, low drilling efficiency and poor wellbore quality.
Liping Tang +4 more
doaj +1 more source
Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan
Shock and Vibration, 2019 This paper investigates the creep groan of a vehicle’s brake experimentally, analytically, and numerically. Experimentally, the effects of acceleration on caliper and strut, noise, brake pressure, and tension are measured.
Dejian Meng +4 more
doaj +1 more source
EnergiesThe critical factors that affect bottomhole stick–slip vibrations during vertical drilling operations are thoroughly investigated and analyzed in this research.
Chinedu Ejike +4 more
doaj +1 more source