潜孔钻机钻架随机动力学模型及可靠性分析

发布时间：2018-06-21 11:01

本文选题：潜孔钻机 + 随机动力学模型　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：潜孔钻机是煤炭、建材、化工及冶金辅助矿山等爆破炮孔使用的重要钻进设备之一,钻机钻架结构运行可靠性高低对生产具有重要意义。由于钻架结构在制造、安装、运行等环节存在着不可避免的随机因素,传统分析将动力学参数视为确定性的量,难以对某些结构破坏问题给出合理解释,因此对潜孔钻机钻架结构可靠性受随机因素影响敏感程度的研究十分必要。本文建立钻架结构随机有限元模型,考虑钢材弹性模量、激励力的大小、激励力频率随机参数,对结构动力学响应及动力可靠性指标的影响规律进行研究。对其进行动力学特性及动力响应分析,得到结构随机参数与激励随机参数单独随机下动应力均值及标准差的分布规律,分析在一阶矩、二阶矩意义下动应力均值及标准差变异性随参数变异系数变化规律。采用应力强度可靠度计算模型,计算随机参数下钻架结构可靠性指标。通过定义相对变化率系数,定量描述钻架结构可靠性指标受随机参数的影响灵敏程度。分析得出影响钻架结构动态响应量及可靠度灵敏的随机参数,为钻架结构可靠性设计及安全运行提供重要理论指导。
[Abstract]:DTH drilling rig is one of the important drilling equipment used in coal, building materials, chemical and metallurgical mines. The reliability of drilling rig structure is of great significance to production. Because of the inevitable random factors in the manufacture, installation and operation of the drilling-frame structure, the traditional analysis regards the dynamic parameters as deterministic quantities, so it is difficult to give a reasonable explanation for some structural failure problems. Therefore, it is necessary to study the sensitivity of drilling frame reliability affected by random factors. In this paper, the stochastic finite element model of drill frame structure is established. Considering the elastic modulus of steel, the magnitude of excitation force and the random parameter of excitation force frequency, the influence law of structural dynamic response and dynamic reliability index is studied. By analyzing its dynamic characteristics and dynamic response, the distribution law of the mean and standard deviation of the dynamic stress under the random parameters of the structure and the random parameters of the excitation are obtained, and the distribution of the mean and the standard deviation of the dynamic stress in the first order moment are analyzed. The variation of dynamic stress mean and standard deviation with the coefficient of variation under the second moment. The reliability index of drill frame under random parameters is calculated by using the stress intensity reliability calculation model. By defining the relative rate of change coefficient, the sensitivity of the reliability index of drill frame structure affected by random parameters is quantitatively described. The random parameters which affect the dynamic response and reliability sensitivity of the drilling frame structure are obtained, which provide important theoretical guidance for the reliability design and safe operation of the drill frame structure.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU63

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