基于钻具—月壤相互作用模型的钻进取心性能研究

发布时间：2018-06-03 00:04

本文选题：钻取采样 + 空心外螺旋钻杆　；参考：《哈尔滨工业大学》2011年硕士论文

【摘要】：本课题针对我国探月三期工程的任务目标,为实现月面钻取采样机构的轻量化、低功耗、高效率和高可靠设计,在分析国外地外天体钻取采样技术的基础上,基于土力学理论、岩土钻掘工程学,结合月壤的机械和物理特性,对其核心执行部件——采样钻具与月壤间的相互作用力学模型进行了基础研究,包括空心外螺旋钻杆与月壤间的相互作用力学模型研究和取心钻头与月壤间的相互作用力学模型研究。在此基础上,通过参数影响分析,对月面采样钻具在月壤中的钻进取心特性进行了研究。根据空心外螺旋钻杆与月壤间的相互作用机理,本文提出了一种空心外螺旋钻杆与月壤相互作用的等效模型——光杆模型,该模型能够将空心外螺旋钻杆与月壤间的相互作用统一等效至空心外螺旋钻杆外包络面上进行分析。通过对光杆模型微元进行运动学分析,建立了光杆模型与月壤相互作用的力学模型。通过分析光杆模型表面月壤应力在深度方向的变化规律,结合光杆模型微元的准静力学分析,建立了空心外螺旋钻杆阻力矩和辅助钻压力关于月壤参数、钻杆参数和钻进规程参数的解析模型。结合月面采样钻具的工艺和需求,本文提出了一种复合式月壤取心钻头,该钻头同时具备切削破碎、排屑和阻隔取心等功能。通过分析取心钻头与月壤间的相互作用机理,基于切削具作用土壤的失效机理和临界深度预测模型,对月壤在取心钻头切削具作用下的失效机理进行了研究。通过分析取心钻头切削具实际切削角,结合切削具作用月壤的失效机理,建立了切削具与月壤相互作用的力学模型,并给出了切削具切削力的解析模型。通过叠加切削具切削阻力矩,建立了取心钻头在恒钻压力作用下的阻力矩解析模型。基于空心外螺旋钻杆与月壤相互作用力学模型,给出了钻杆参数和钻进规程参数对钻杆阻力矩、辅助钻压力、功率和进尺速度的影响分析。为了便于取心钻头切削具作用月壤失效角的准确和快速搜索,建立了一种失效角预估模型。基于取心钻头与月壤相互作用力学模型,给出了切削具作用月壤失效距离、取心钻头结构参数、月壤外摩擦角和钻压力对取心钻头阻力矩的影响分析。参数影响分析对钻具与月壤间的相互作用进行了数学描述,为月面钻取采样机构的负载分析和钻具优化设计奠定了理论基础。
[Abstract]:In order to realize the lightweight, low power consumption, high efficiency and high reliability design of the lunar drilling sampling mechanism for the third phase of the lunar exploration project in China, this subject is based on the analysis of the sampling technology of the foreign extraterrestrial bodies and the theory of soil mechanics. Based on the mechanical and physical properties of lunar soil, the mechanical model of the interaction between sampling drilling tool and lunar soil is studied. The research includes the study of the interaction mechanics model between hollow outer helical drill pipe and lunar soil and the mechanical model of the interaction between core bit and lunar soil. On the basis of this, the coring characteristics of lunar surface sampling drilling tools in lunar soil were studied by analyzing the influence of parameters. According to the interaction mechanism between hollow outer helical drill pipe and lunar soil, an equivalent model of interaction between hollow outer helical drill pipe and lunar soil is presented in this paper. The model can unify the interaction between the hollow outer helical drill pipe and the lunar soil and analyze the outer net surface of the hollow outer helical drill pipe. Based on the kinematics analysis of the bare rod model, a mechanical model of the interaction between the bare rod model and the lunar soil was established. By analyzing the variation law of lunar soil stress on the surface of the bare rod model and combining the quasi-static analysis of the micro-element of the bare rod model, the resistance moment of the hollow outer spiral drill pipe and the auxiliary drilling pressure on the parameters of the lunar soil are established. The analytical model of drill pipe parameters and drilling rules parameters. Combined with the technology and requirement of lunar surface sampling drilling tool, a compound lunar soil coring bit is presented in this paper, which has the functions of cutting and breaking, chip removal and blocking coring. Based on the analysis of the interaction mechanism between the core bit and the lunar soil, based on the failure mechanism of the cutting tool soil and the prediction model of critical depth, the failure mechanism of the lunar soil under the action of the core bit cutting tool was studied. Based on the analysis of the actual cutting angle of the core bit cutting tool and the failure mechanism of the cutting tool acting on the lunar soil, the mechanical model of the interaction between the cutting tool and the lunar soil is established, and the analytical model of the cutting force of the cutting tool is given. The analytical model of resistance moment of core bit under constant drilling pressure is established by superimposing cutting resistance moment of cutting tool. Based on the mechanical model of the interaction between hollow outer helical drill pipe and lunar soil, the effects of drill pipe parameters and drilling rules parameters on drill pipe resistance moment, auxiliary drilling pressure, power and feed speed are analyzed. In order to facilitate the accurate and fast searching of the failure angle of the core bit cutting tool, a prediction model of failure angle was established. Based on the mechanical model of the interaction between the core bit and the lunar soil, the effects of the failure distance of the cutting tool on the lunar soil, the structural parameters of the core bit, the external friction angle of the lunar soil and the drilling pressure on the resistance moment of the core bit are analyzed. The interaction between drilling tool and lunar soil is described by parameter influence analysis, which lays a theoretical foundation for load analysis and optimum design of drilling tool for lunar drilling sampling mechanism.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：P184.5

【引证文献】