月壤钻取采样装置加载机构设计与研究

发布时间：2017-12-27 01:20

本文关键词：月壤钻取采样装置加载机构设计与研究　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国探月工程三期主要任务之一是通过钻采方式获取深度不小于2米的月壤样品。加载机构作为在钻采过程中提供钻压力和控制钻进速度的重要装置,其卓越的性能及结构可靠性是保证钻取采样成功的关键因素。由于国外的技术封锁及国内在此方面起步较晚,目前鲜有月面钻取采样用加载机构的研究资料。为分析加载机构性能,确定参数优化设计方向,需要对加载机构进行结构设计与性能分析,为我国探月工程三期月面采样系统提供技术支持。依照探月工程三期钻取采样任务的总体规划,明确加载机构的功能要求并对其任务剖面进行分析。建立加载机构裕度分析模型,在对其驱动力裕度分析基础上进行加载输出单元的裕度设计。为保证加载机构高可靠性,应用FMEA和FTA可靠性方法对加载机构进行建模与分析,定性和定量的阐明加载机构中各部件故障与整体可靠性的关系,得出加载机构的可靠性关键环节。从加载绳与卷筒的连接方式与缠绕方式两方面,对加载绳与卷筒连接接口结构分别提出2种方案。建立钢丝绳与卷筒作用力学模型,分析不同工况下结构参数与加载性能间的关系并进一步确定4种方案下加载机构结构参数。应用层次分析法根据相应评价标准建立评价模型并确定最佳方案。设计加载驱动单元结构方案,建立加载轴系力学模型并仿真校核轴系受力状态。通过静力和热力仿真分析,确定导向轮关键尺寸优选参数。建立钢丝绳抛物线模型,根据任务环境从静力、振动、附加内力三方面分析预紧力与钢丝绳性能的关系并确定最小初始预紧力。建立卷筒筒壁单元梁模型,推导卷筒在钢丝绳缠绕下的变形公式并仿真得出两种极端位置下卷筒受力变形。考虑加载机构刚柔混合结构特性,不断细化加载机构的动力学模型。在建立刚体、弹性动力学模型基础上,应用集中参数法引入间隙、阻尼等柔性环节建立加载机构各子部件物理模型,得到考虑柔性环节的加载机构动力学方程。对加载机构在钻具钻进月壤/月岩两种工况下动力学特性进行数值模拟并分析其在典型负载下的响应。应用Adams Cable模块对绳轮系统进行建模与仿真,分析钢丝绳参数对系统响应的影响。通过变参数分析,得到加载机构参数与响应的关系。
[Abstract]:One of the main tasks of the three phase of China's lunar exploration project is to obtain the lunar soil samples with depth of less than 2 meters through drilling and mining. Loading mechanism is an important device to provide drilling pressure and control drilling speed in drilling and production. Its excellent performance and structural reliability are the key factors to ensure the success of drilling and sampling. Because of the technical blockade of foreign countries and the late start of China in this field, there are few research materials on the loading mechanism of the monthly drilling and sampling. In order to analyze the performance of the loading mechanism and determine the direction of parameter optimization, we need to carry out the structural design and performance analysis of the loading mechanism, so as to provide technical support for the three phase lunar surface sampling system of our lunar exploration project. According to the overall planning of the three phase drilling and sampling task, the functional requirements of the loading mechanism are clearly defined and the mission profile is analyzed. The margin analysis model of the loading mechanism is set up, and the margin design of the loading and output unit is carried out on the basis of its driving force margin analysis. In order to ensure high reliability of loading mechanism, FMEA and FTA reliability methods are used to model and analyze loading mechanism, qualitatively and quantitatively explain the relationship between the failure of each part in the loading mechanism and the overall reliability, and get the key link of the reliability of the loading mechanism. From two aspects of the connection mode and winding mode of the load rope and the reel, 2 schemes are proposed for the connection interface structure of the load rope and the reel. A mechanical model of wire rope and reel is established, and the relationship between structural parameters and loading performance under different conditions is analyzed, and the structural parameters of the 4 loading mechanisms are further determined. The analytic hierarchy process (AHP) is used to establish the evaluation model and determine the best scheme according to the corresponding evaluation criteria. The load driving unit structure scheme is designed, the load shafting mechanics model is set up and the force state of the shaft system is checked and checked. Through the static and thermal simulation analysis, the parameters of the key dimensions of the steering wheel are determined. A parabolic model of wire rope is established. According to the task environment, the relationship between preload and wire rope performance is analyzed from three aspects of static force, vibration and additional internal force, and the minimum initial preload is determined. The model of the barrel wall element beam is established, and the deformation formula of the reel under the wire rope is deduced and the force deformation of the two kinds of reels under the extreme position is simulated. The rigid flexible hybrid structure characteristics of the loading mechanism are considered, and the dynamic model of the loading mechanism is continuously refined. On the basis of rigid body and elastic dynamic model, the lumped parameter method is applied to introduce the flexible links such as clearance and damping, and the physical models of each sub part of the loading mechanism are established, and the dynamic equations of the loading mechanism considering the flexible links are obtained. The loading mechanism of lunar soil drilling / dynamic characteristics of two kinds of rocks under the condition of the numerical simulation and analysis of the response in the typical load conditions in drilling. The Adams Cable module is used to model and simulate the rope wheel system, and the influence of the wire rope parameters on the response of the system is analyzed. The relationship between the parameters of the loading mechanism and the response is obtained by the variable parameter analysis.
【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】：2015
【分类号】：V476.3

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