指向式旋转导向系统偏置心轴的动力学仿真和疲劳特性研究

发布时间：2018-03-07 15:00

  本文选题：旋转导向系统　切入点：偏置心轴　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：机械内偏置指向式旋转导向系统可以很好地解决滑动导向钻井中钻进效率低、钻进深度受限、井眼光滑、对水平井和复杂井钻进困难等问题。已有研究成果表明偏置心轴是导向机构中的薄弱环节,本文应用数值模拟方法研究机械内偏置指向式旋转导向系统导向机构中偏置心轴动力学及疲劳特性,为导向机构的心轴的设计提供技术支持。论文在已有试验样机的基础上,用Solidworks和Ansysworkbench软件建立了偏置心轴及轴承的力学模型,确定了单元类型、材料属性和心轴的约束条件等参数,计算得出心轴的在静止偏置力作用下的应力、应变及挠度大小。对导向机构的心轴进行了动力学仿真分析,模拟心轴在不同的挠度情况下,旋转弯曲过程中的偏转角度、最大应力和偏置力等参数,并将其与已有的理论分析、试验研究、静力学分析等结果进行对比分析,为设计改进提供了依据。利用钛合金心轴材料的疲劳曲线,在RecurDyn软件中进行拟合,在心轴的应力应变水平下选择相关的疲劳计算准则和应力历史修正方法计算得出心轴的疲劳寿命,并与理论计算和试验得出的寿命进行了分析对比,给出了偏置心轴设计的改进意见。
[Abstract]:The rotary steering system with mechanical bias pointing can solve the problems of low drilling efficiency, limited drilling depth and smooth borehole in sliding guide drilling. For horizontal well and complex well drilling difficulty, the research results show that the bias core shaft is the weak link in the guiding mechanism. In this paper, a numerical simulation method is used to study the dynamic and fatigue characteristics of the bias axis in the steering mechanism of the mechanical internal bias steering system, which provides technical support for the design of the steering mechanism. The mechanical model of the eccentric shaft and bearing is established by using Solidworks and Ansysworkbench software. The parameters such as element type, material properties and constraint conditions of the shaft are determined, and the stress of the core shaft under the action of static bias force is calculated. The dynamic simulation analysis of the core shaft of the steering mechanism is carried out. The parameters such as the deflection angle, the maximum stress and the deflection force of the core shaft in the process of rotating and bending under different deflection conditions are simulated. The results of theoretical analysis, experimental study and statics analysis are compared and analyzed, which provides the basis for design improvement. The fatigue curves of titanium alloy core shaft are fitted in RecurDyn software. The fatigue life of the core shaft is calculated by selecting the relevant fatigue calculation criterion and the stress history correction method under the stress strain level of the core shaft, and the fatigue life of the core shaft is analyzed and compared with that obtained by the theoretical calculation and the test. Some suggestions for improving the design of bias axis are given.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE92
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本文编号：1579776