月球土壤采样钻具钻进过程热特性分析

发布时间：2018-03-07 19:36

本文选题：瞬态热响应特性　切入点：辐射传热　出处：《哈尔滨工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：月球探测工程是我国目前开展深空探测活动的首要任务。月球土壤（月壤）中含有丰富的月球环境和空间环境变化信息，对月壤的研究，不仅是探索太阳系演化过程的重要基础，也是月球矿物、能源资源的储量、分布和开发利用价值的评估依据。月壤采样钻具的研制是决定月球样品采样成功与否的关键环节，而复杂的月球表面（月面）热环境对钻具的热特性分析提出了特殊的要求，进而对钻具结构和钻进规程控制的设计具有重要意义。本文针对一种类似于前苏联月球探测器LUNA24号所采用的空心钻杆加软袋式取样钻具，建立了钻具在月球表面热环境下的分析模型；结合文献资料数据，确定了一种相对恶劣的月球表面极限环境参数。对钻具在月球表面热环境下钻进采集月壤样品的过程进行了热分析计算；分析了钻具钻进过程中影响表面生热的月壤物性参数影响。研究了钻进过程中钻具的受力状态，建立了热力边界条件的关联，编制了ANSYS命令流，实现了钻具在不同工况下的热特性分析。通过对正常工况、恶劣工况以及停机工况下钻具的瞬态热响应计算分析，讨论了以转速、进尺速度为主的钻进规程参数对钻具最高温度变化和整体温度分布的影响。结合正常钻进工况和停机工况的温度分布特性，，提出了间歇性停机的钻进方式，获得了钻具高温区域温度控制方案，对钻进规程设计有一定指导意义。此外，为了进一步完善本文所建立的热分析模型，补充开展了地面热环境下钻具的热响应特性计算，为后续地面试验验证做好准备。
[Abstract]:Lunar exploration project is the first task of deep space exploration in our country. Lunar soil (lunar soil) contains abundant information of lunar environment and space environment change. It is not only an important basis for exploring the evolutionary process of the solar system, but also an evaluation basis for the reserves, distribution and exploitation value of the lunar mineral and energy resources. The development of lunar soil sampling drilling tool is the key to the success of lunar sample sampling. The complex thermal environment of lunar surface (lunar surface) puts forward special requirements for the analysis of the thermal characteristics of the drilling tool. Furthermore, it is of great significance to the design of drilling tool structure and drilling regulation control. In this paper, an analytical model of hollow drill pipe and soft bag type sampling drilling tool, which is similar to that used by the former USSR lunar probe LUNA24, is established under the thermal environment of the lunar surface. A relatively bad limiting environmental parameter of the lunar surface is determined. The process of drilling the lunar soil samples under the lunar surface thermal environment is analyzed and calculated. This paper analyzes the influence of lunar soil physical parameters on surface heat in drilling process of drilling tools, studies the stress state of drilling tools, establishes the correlation of thermal boundary conditions, and compiles the ANSYS command flow. The thermal characteristics of drilling tools under different working conditions are analyzed. Through the calculation and analysis of the transient thermal response of the drilling tool under normal, bad and downtime conditions, the rotational speed is discussed. The influence of drilling regulation parameters mainly on the variation of maximum temperature and overall temperature distribution of drilling tools is discussed. According to the temperature distribution characteristics of normal drilling conditions and shutdown conditions, the drilling mode of intermittent shutdown is put forward. The temperature control scheme in high temperature area of drilling tool is obtained, which has certain guiding significance for drilling regulation design. In addition, in order to further improve the thermal analysis model established in this paper, the thermal response characteristics of drilling tools under the ground thermal environment are calculated to prepare for the subsequent ground test verification.
【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】：2012
【分类号】：P634;P184

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