本文選題：月塵顆粒　切入點：力學(xué)特性　出處：《哈爾濱工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：月塵是月球表面附著的粉末狀物質(zhì),由于具有較強的黏附性和靜電特性,月塵容易在月球探測器各裝置的表面上沉積,并有可能進入機構(gòu)間隙,造成設(shè)備堵塞、機構(gòu)卡死等問題。目前常用的顆粒接觸力學(xué)本構(gòu)模型將顆粒簡化為光滑、均質(zhì)的球形顆粒,不能對不規(guī)則月塵顆粒的接觸特性進行合理描述,無法反應(yīng)月塵顆粒進入機構(gòu)間隙后的真實作用情況�；谝陨蠁栴},本文結(jié)合月塵性質(zhì)對現(xiàn)有接觸力學(xué)模型進行改進,提出基于形狀描述的月塵顆粒接觸力學(xué)模型,并利用該模型進行月塵顆粒對運動副運動特性的影響研究。結(jié)合月塵性質(zhì)對現(xiàn)有接觸力學(xué)模型局限性進行分析和改進,將不規(guī)則形狀引入力學(xué)模型中,對月塵顆粒進行基于分形理論的形狀建模和基于傅里葉理論的形狀建模,同時對兩種建模方法進行比較和選用,最終得到月塵顆粒形狀描述數(shù)學(xué)模型。此外,進行模擬月塵樣品顆粒圖像采集,對得到的顆粒二維投影輪廓圖像進行后處理和分布統(tǒng)計,得到模擬月塵顆粒形狀分布概率模型。在月塵顆粒形狀描述數(shù)學(xué)模型基礎(chǔ)上建立基于形狀描述的不規(guī)則月塵顆粒接觸力學(xué)模型,并通過月塵顆粒法向力學(xué)特性測試試驗對其加以驗證。利用基于形狀描述的不規(guī)則顆粒接觸力學(xué)模型對不規(guī)則顆粒進行球顆粒等效,提出基于分段函數(shù)擬合的等效算法,并通過離散元軟件二次開發(fā)平臺編寫力學(xué)模型插件,驗證算法可靠性。采用不規(guī)則顆粒等效模型并按照模擬月塵顆粒形狀分布概率生成大量顆粒,進行月塵顆粒對運動副運動特性影響的離散元仿真,通過仿真過程中轉(zhuǎn)矩變化判斷是否出現(xiàn)卡死現(xiàn)象,同時對比輪軸掩埋試驗結(jié)果,分析仿真結(jié)果正確性。最終通過離散元仿真實現(xiàn)偏心距、轉(zhuǎn)速以及配合表面性質(zhì)等因素對轉(zhuǎn)矩影響的仿真預(yù)測,結(jié)合仿真結(jié)果對未來月面探測器的設(shè)計提出理論性建議。
[Abstract]:Lunar dust is a powdered material attached to the surface of the moon. Because of its strong adhesion and electrostatic properties, lunar dust is easy to deposit on the surface of the lunar probe devices, and may enter the mechanism gap, resulting in equipment blockage. The current constitutive model of particle contact mechanics simplifies particles to smooth, homogeneous spherical particles, which can not reasonably describe the contact characteristics of irregular lunar dust particles. Based on the above problems, this paper improves the existing contact mechanics model based on the character of lunar dust, and puts forward the contact mechanics model of lunar dust particles based on shape description. The influence of lunar dust particles on the motion characteristics of motion pair is studied by using this model. The limitation of the existing contact mechanics model is analyzed and improved by combining the characteristics of lunar dust, and the irregular shape is introduced into the mechanical model. The shape modeling of lunar dust particles based on fractal theory and the shape modeling based on Fourier theory is carried out. At the same time, the two modeling methods are compared and selected. Finally, the mathematical model of the shape description of lunar dust particles is obtained. The particle images of the simulated lunar dust samples were collected, and the two dimensional projection contour images of the particles were processed and distributed statistically. The probability model of simulating the shape distribution of lunar dust particles is obtained. Based on the mathematical model of the shape description of lunar dust particles, the contact mechanics model of irregular lunar dust particles based on shape description is established. It is verified by the test of normal mechanical properties of lunar dust particles. The spherical particles are equivalent to irregular particles based on shape description, and an equivalent algorithm based on piecewise function fitting is proposed. The reliability of the algorithm is verified by compiling the mechanical model plug-in on the second development platform of discrete element software. The irregular particle equivalent model is adopted and a large number of particles are generated according to the probability of simulating the distribution of lunar dust particles. The discrete element simulation of the influence of lunar dust particles on the motion characteristics of the motion pair is carried out. The torque changes in the simulation process are used to judge whether the phenomenon of entrapment occurs or not, and the results of the wheel shaft burying test are compared at the same time. Finally, the influence of eccentricity, rotational speed and matching surface properties on torque is predicted by discrete element simulation, and some theoretical suggestions for the design of lunar detector in the future are put forward based on the simulation results.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：V476.3

【相似文獻】

相關(guān)期刊論文 前3條

1 劉志剛;周石琳;趙鍵;;基于形狀描述算子的仿射點匹配算法[J];電光與控制;2012年05期

2 湯進;陳展展;羅斌;;統(tǒng)計骨架信息的形狀描述新方法[J];重慶大學(xué)學(xué)報;2011年12期

3 ;[J];;年期

相關(guān)會議論文 前2條

1 馬峰;;基于邊心距弦分布直方圖的形狀描述算法及仿真[A];第九屆全國光電技術(shù)學(xué)術(shù)交流會論文集（下冊）[C];2010年

2 秦實宏;韓水華;;演化多邊形的分層檢索[A];中國圖象圖形學(xué)會第十屆全國圖像圖形學(xué)術(shù)會議（CIG’2001）和第一屆全國虛擬現(xiàn)實技術(shù)研討會（CVR’2001）論文集[C];2001年

相關(guān)博士學(xué)位論文 前1條

1 趙海峰;基于圖的形狀描述方法研究[D];安徽大學(xué);2006年

相關(guān)碩士學(xué)位論文 前7條

1 汪國彬;形狀描述與匹配研究[D];北京理工大學(xué);2015年

2 潘萬競;基于離散元理論的月塵顆粒接觸力學(xué)特性研究[D];哈爾濱工業(yè)大學(xué);2016年

3 郅大鵬;基于復(fù)雜網(wǎng)絡(luò)的形狀描述方法研究[D];安徽大學(xué);2014年

4 葉琳;形狀描述與匹配的理論與應(yīng)用研究[D];北京交通大學(xué);2011年

5 趙永剛;圖像檢索中形狀描述和匹配算法研究[D];南昌航空大學(xué);2010年

6 陳展展;基于輪廓和骨架的形狀描述與匹配研究[D];安徽大學(xué);2011年

7 劉秀朋;輪廓曲線的形狀描述與匹配算法研究[D];南昌航空大學(xué);2012年

，

本文編號：1559900