本文關(guān)鍵詞：月壤采樣鉆具限幅機構(gòu)設(shè)計與力學分析　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(guān)文章： 月壤采樣鉆具 限幅機構(gòu):結(jié)構(gòu)設(shè)計 力學模型 有限元

【摘要】：本文以我國正在實施的月面鉆取采樣裝置的研制為工程背景,以鉆具限幅機構(gòu)的結(jié)構(gòu)設(shè)計、力學分析及及試驗驗證為主要研究內(nèi)容,針對采樣鉆具的任務(wù)需求、工作環(huán)境及具體的結(jié)構(gòu)形式,采用航天產(chǎn)品結(jié)構(gòu)設(shè)計、動力學分析和環(huán)境模擬試驗驗證方法,研制了一種可解鎖式鉆具支撐結(jié)構(gòu)——鉆具限幅機構(gòu)。以鉆取采樣裝置任務(wù)需求為基礎(chǔ),開展限幅機構(gòu)方案設(shè)計研究。在多方案綜合比較分析的基礎(chǔ)上,提出了一種新型定點解鎖式鉆具限幅方案。該方案保證在空間運輸及淺層鉆進階段的限幅導向,并在鉆進后半段完成解鎖避讓。針對限幅機構(gòu)優(yōu)選方案,進行限幅機構(gòu)結(jié)構(gòu)詳細設(shè)計及力學參數(shù)分析。以鋼球鎖釋組件為研究對象,進行力學分析,確定其摩擦類型轉(zhuǎn)換的邊界條件,給出預(yù)緊力估計公式,以提高解鎖力穩(wěn)定性為目標匹配各構(gòu)件摩擦系數(shù);對包括鎖合組件、限幅環(huán)、支撐架在內(nèi)的附屬結(jié)構(gòu)進行相應(yīng)設(shè)計及優(yōu)化;以限幅機構(gòu)為研究對象,進行剛度強度性能分析,分析其在不同工況下的承載能力;以結(jié)構(gòu)設(shè)計內(nèi)容為基礎(chǔ),研制限幅機構(gòu)試驗樣機。將限幅機構(gòu)作為鉆具支撐系統(tǒng)的一部分,分析其與鉆具的相互作用關(guān)系。根據(jù)鉆具的結(jié)構(gòu)尺寸及支撐形式,對鉆具及其支撐系統(tǒng)進行力學簡化;基于Euler-Bernoulli梁理論建立多點支撐預(yù)應(yīng)力鉆具剛度力學模型,分析軸向預(yù)緊與徑向限幅對鉆具剛度的影響;以限幅環(huán)約束下的鉆具為研究對象,考慮支撐間隙的影響,采用力學分析與動力學仿真相結(jié)合的方法,分析典型工況下鉆具的動力響應(yīng),并估算動力沖擊載荷;基于Hertz接觸理論,結(jié)合有限元仿真,分析螺旋翼與鉆桿的接觸情況,獲得接觸應(yīng)力及接觸變形與支撐間隙的關(guān)系,并校核現(xiàn)有結(jié)構(gòu)參數(shù)的接觸強度。針對所設(shè)計的限幅機構(gòu)試驗樣機,開展限幅機構(gòu)性能與力學試驗研究。針對限幅機構(gòu)試驗需求,制訂試驗方法,并進行限幅機構(gòu)性能試驗系統(tǒng)的設(shè)計與制作;利用研制的測試系統(tǒng),開展限幅機構(gòu)功能性能試驗測試與分析。
[Abstract]:This paper takes the research and development of the lunar drilling sampling device which is being implemented in our country as the engineering background, taking the structure design, mechanical analysis and test verification of the limiting mechanism of the drilling tool as the main research content, aiming at the task demand of the sampling drilling tool. The working environment and the concrete structure form are used to verify the structure design, dynamics analysis and environmental simulation test of aerospace products. In this paper, an unlocked drilling tool support structure, drilling tool limiting mechanism, is developed. Based on the task requirement of drilling sampling device, the design of limiting mechanism scheme is studied. On the basis of comprehensive comparison and analysis of multiple schemes. In this paper, a new fixed-point unlocking drilling tool limiting scheme is proposed, which ensures the limiting guidance in the space transportation and shallow drilling stage, and completes the unlocking and avoiding in the second half of drilling, aiming at the optimal selection scheme of the limiting mechanism. Taking the steel ball lock release assembly as the research object, the mechanical analysis is carried out, the boundary conditions of the friction type conversion are determined, and the formula for estimating the pretension force is given. The friction coefficient of each component is matched to improve the stability of the unlock force. Corresponding design and optimization of accessory structure including locking assembly, limiting ring and support frame; Taking the limiting mechanism as the research object, the stiffness and strength performance of the mechanism is analyzed, and its bearing capacity under different working conditions is analyzed. Based on the structural design content, the experimental prototype of the limiting mechanism is developed. The limiting mechanism is regarded as a part of the support system of the drilling tool, and the interaction between the limiting mechanism and the drilling tool is analyzed. According to the structure size and the supporting form of the drill tool. The drilling tool and its supporting system are simplified by mechanics. Based on Euler-Bernoulli beam theory, the stiffness mechanics model of multi-point braced prestressed drilling tool is established, and the influence of axial pretension and radial limiting on the stiffness of drill tool is analyzed. Considering the influence of support gap, the dynamic response of drilling tool under typical working conditions is analyzed by combining mechanical analysis with dynamic simulation, and the dynamic impact load is estimated. Based on Hertz contact theory and finite element simulation, the contact between helical wing and drill pipe is analyzed, and the relationship between contact stress, contact deformation and support clearance is obtained. And check the contact strength of the existing structural parameters. For the designed limiting mechanism test prototype, the performance and mechanics of the limiting mechanism test research. According to the testing requirements of the limiter mechanism, establish the test method. And the design and manufacture of the performance test system of the limiting mechanism are carried out. The function performance test and analysis of the limiting mechanism are carried out by using the developed test system.
【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

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