本文關鍵詞：月壤鉆取采樣裝置加載機構設計與研究　出處：《哈爾濱工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 加載機構 月壤鉆取采樣 可靠性分析 動力學建模

【摘要】：我國探月工程三期主要任務之一是通過鉆采方式獲取深度不小于2米的月壤樣品。加載機構作為在鉆采過程中提供鉆壓力和控制鉆進速度的重要裝置,其卓越的性能及結構可靠性是保證鉆取采樣成功的關鍵因素。由于國外的技術封鎖及國內在此方面起步較晚,目前鮮有月面鉆取采樣用加載機構的研究資料。為分析加載機構性能,確定參數(shù)優(yōu)化設計方向,需要對加載機構進行結構設計與性能分析,為我國探月工程三期月面采樣系統(tǒng)提供技術支持。依照探月工程三期鉆取采樣任務的總體規(guī)劃,明確加載機構的功能要求并對其任務剖面進行分析。建立加載機構裕度分析模型,在對其驅動力裕度分析基礎上進行加載輸出單元的裕度設計。為保證加載機構高可靠性,應用FMEA和FTA可靠性方法對加載機構進行建模與分析,定性和定量的闡明加載機構中各部件故障與整體可靠性的關系,得出加載機構的可靠性關鍵環(huán)節(jié)。從加載繩與卷筒的連接方式與纏繞方式兩方面,對加載繩與卷筒連接接口結構分別提出2種方案。建立鋼絲繩與卷筒作用力學模型,分析不同工況下結構參數(shù)與加載性能間的關系并進一步確定4種方案下加載機構結構參數(shù)。應用層次分析法根據(jù)相應評價標準建立評價模型并確定最佳方案。設計加載驅動單元結構方案,建立加載軸系力學模型并仿真校核軸系受力狀態(tài)。通過靜力和熱力仿真分析,確定導向輪關鍵尺寸優(yōu)選參數(shù)。建立鋼絲繩拋物線模型,根據(jù)任務環(huán)境從靜力、振動、附加內力三方面分析預緊力與鋼絲繩性能的關系并確定最小初始預緊力。建立卷筒筒壁單元梁模型,推導卷筒在鋼絲繩纏繞下的變形公式并仿真得出兩種極端位置下卷筒受力變形�？紤]加載機構剛柔混合結構特性,不斷細化加載機構的動力學模型。在建立剛體、彈性動力學模型基礎上,應用集中參數(shù)法引入間隙、阻尼等柔性環(huán)節(jié)建立加載機構各子部件物理模型,得到考慮柔性環(huán)節(jié)的加載機構動力學方程。對加載機構在鉆具鉆進月壤/月巖兩種工況下動力學特性進行數(shù)值模擬并分析其在典型負載下的響應。應用Adams Cable模塊對繩輪系統(tǒng)進行建模與仿真,分析鋼絲繩參數(shù)對系統(tǒng)響應的影響。通過變參數(shù)分析,得到加載機構參數(shù)與響應的關系。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V476.3

【引證文獻】

相關會議論文 前1條

1 龐_g;鄧湘金;鄭燕紅;;面對月壤采集的自動鉆取機構設計[A];中國宇航學會深空探測技術專業(yè)委員會第八屆學術年會論文集（下篇）[C];2011年

，

本文編號：1339663