金刚石止推轴承组振动特性研究

发布时间：2018-03-22 09:02

  本文选题：金刚石止推轴承组　切入点：振动特性　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】：金刚石止推轴承组是孔下动力钻具的关键部件之一,钻进时其承受着旋转摩擦、振动、冲击等恶劣工况,容易造成金刚石片破碎、脱落、磨损,金刚石止推轴承组的可靠性和寿命已经成为制约孔下动力钻具发展的重点所在。本文利用105金刚石止推轴承组,开展其轴向振动特性研究。论文主要开展了以下工作:首先,分析了金刚石止推轴承组在实际钻进过程中所处的孔内工况,通过简化假设,建立了金刚石止推轴承组的振动模型,以及其在周期性振动、阶跃振动、锯齿振动三种振动状态下的振动响应模型,为金刚石止推轴承组的分析研究提供了理论基础。其次,结合振动实验台,设计了一套金刚石止推轴承组振动模拟实验系统,包括旋转输出台、旋转传动轴、钻杆支撑夹具以及调距夹具,完成了该系统的组装及调试,具有提供旋转、模拟孔底摩擦切削、传递振动、振动扫频、测试轴承组振动响应的功能。借助该实验系统对金刚石止推轴承组进行了扫频实验,确定了其固有振动频率,并利用锤击法进行了验证,实验表明:金刚石止推轴承组的一阶固有频率、二阶固有频率和三阶固有频率分别为61Hz、100Hz和250Hz,孔底作业时应尽量避开此频率区间,减少共振破坏。通过开展不同振动类型、振动频率、振动力大小下的金刚石止推轴承组的振动实验,测试其响应特性,实验表明:(1)金刚石止推轴承组在50Hz、90Hz、189 Hz附近响应明显,在金刚止推轴承组设计时应尽量避开该频率区;(2)金刚石止推轴承组的振动研究应当针对内圈与外圈分别进行分析讨论。论文所开发的振动实验系统可为后续孔底工具振动测试提供模拟条件,为金刚止推轴承组及底部钻具组合(BHA)的优化设计提供参考依据。
[Abstract]:The diamond thrust bearing group is one of the key parts of the drill tool under the hole. It is subjected to the bad working conditions such as rotating friction, vibration, impact and so on, which can easily lead to the breakage, shedding and wear of the diamond sheet. The reliability and life of diamond thrust bearing set have become the key point of restricting the development of dynamic drilling tools under hole. In this paper, the axial vibration characteristics of 105 diamond thrust bearing group are studied. The main work of this paper is as follows: first, The working conditions of diamond thrust bearing group in the hole during drilling are analyzed. By simplifying the hypothesis, the vibration model of diamond thrust bearing group is established, and the periodic vibration and step vibration of diamond thrust bearing group are established. The vibration response model under three kinds of vibration states of sawtooth vibration provides a theoretical basis for the analysis and research of diamond thrust bearing group. Secondly, a set of vibration simulation experiment system for diamond thrust bearing group is designed with the vibration test bench. Including rotary output table, rotary drive shaft, drill pipe supporting fixture and adjusting distance fixture, the system has been assembled and debugged, which provides rotation, simulation hole bottom friction cutting, transfer vibration, vibration sweep, The function of vibration response of bearing group was tested. The frequency sweep experiment of diamond thrust bearing group was carried out with the help of the experimental system, and the natural vibration frequency was determined, which was verified by hammering method. The experimental results show that the first, second and third natural frequencies of diamond thrust bearing group are 61 Hz and 250 Hz respectively. The frequency range should be avoided and the resonance damage should be reduced when the bottom of the hole is operated. The vibration experiment of diamond thrust bearing group under vibration frequency and vibration force shows that the response characteristics of diamond thrust bearing group are obvious in the range of 50Hz ~ 90Hz ~ (~ (189) Hz). The vibration research of diamond thrust bearing group should be analyzed and discussed separately for inner ring and outer ring. The vibration experiment system developed in this paper can be used as the bottom of follow-up hole. Tool vibration testing provides simulation conditions, It provides a reference for the optimization design of bearing group and bottom drilling tool combination.
【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】：P634.4
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本文编号：1647964