关键词: 振动, 模型, 软件, 实验, 边界条件

Abstract: At present,the end of drill string (DS) is simplified as a hinge in FE analysis and the excitation is assumed periodic.This paper emphasizes the longitudinal vibration of DS by modelling the lower end of DS with actual boundary condition.The structural mass matrix and stiffness matrix are obtained,from which the proportional damping matrix is also obtained.The real boundary condition of the lower end of DS is obtained by studying the interaction between the roller cone bit and the rocks.The vibration equation is dissolved by the HOUBOLT technique,a numerical solution method.A simulation software was developed according to the above vibration model.A lot of simulating experiments have been carried out.Some meaningful results are obtained which will guide drilling operations.

Key words: vibration, model, software, experiment, boundary condition