【摘 要】
：
The drill-strings are slender structures, with length reaching several kilometers.They transfer rotary motion to the drill-bit in the process of drilling bo
【机 构】
：
CentreforAppliedDynamicsResearch,UniversityofAberdeen,Scotland,UK
【出 处】
：
第三届非线性力学最新进展国际会议Third International Conference on Recent Adv
论文部分内容阅读
The drill-strings are slender structures, with length reaching several kilometers.They transfer rotary motion to the drill-bit in the process of drilling bore-hole for oil/gas ex-traction.Complex behaviour of the system can result from presence at the same time of different dynamical phenomena, including torsional, lateral and axial vibrations, stick-slip, bit bounce and bit-whirl.Interactions between these phenomena introduces additional complexity to the system dynamics.The occurrence of these phenomena, especially stick-slip vibrations, lead to the reduction of depth of penetration and may cause failures and wear to the drilling equipment, thus increasing considerably drilling time and its costs.
其他文献
The elastic vibration response of two-layer semiconducting microcantilevers, which were excited with a frequency-modulated pump laser and detected use anoth
A novel model comprising of a vibration absorber and an axially loaded beam bridge is studied from a vibratory power flow viewpoint to examine its dynamical
To study the stress triaxiality in the neck region of the circumferentially notched tension bars, the distribution of strain and stress are calculated analy
A fracture criterion is newly proposed to predict fracture initiation and model fracture behavior of metal materials for four different fracture mechanisms
In this talk, some new results we obtained recently on generalized Hamiltonian systems will be presented.Mathematically, a n-dimensional dynamical system is
A new higher-order nonlocal strain gradient elasticity theory which considers higher-order stress gradient and strain gradient nonloeality is proposed.It is
We consider a body moving in a rarefied homogeneous medium composed of point particles.The body is a bounded connected domain with piecewise smooth boundary
We study the synchronization of two rotating pendula mounted on a horizontal beam which can roll on the parallel surface.The pendula are forced to rotate by
The vibration characteristics of microcantilevers can be used in many applications including atomic force microscopy (AFM), biological detection, and chemic