本文關(guān)鍵詞：空間關(guān)節(jié)的軸承間隙演化規(guī)律研究　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大型機(jī)械臂 可靠性 空間關(guān)節(jié) 赫茲接觸理論 最大軸向載荷 軸承溫度場(chǎng)分布 熱應(yīng)力耦合分析 間隙演化規(guī)律

【摘要】：航天機(jī)構(gòu)工作在溫差大、高真空和高輻射的空間環(huán)境中，其運(yùn)行狀態(tài)和受力情況都會(huì)受到影響。本文以空間站大型機(jī)械臂的輸出關(guān)節(jié)為研究對(duì)象，突破了以往在單一條件下的分析。重點(diǎn)研究交變溫度、轉(zhuǎn)動(dòng)速度、載荷大小三個(gè)因素耦合作用下，關(guān)節(jié)處軸承的間隙演化規(guī)律，防止間隙過(guò)大或過(guò)小導(dǎo)致軸承發(fā)生故障，確保空間關(guān)節(jié)的安全可靠性，，從而達(dá)到減少航天機(jī)構(gòu)發(fā)生故障的概率。本文的主要研究?jī)?nèi)容如下： 首先，針對(duì)空間機(jī)械臂輸出關(guān)節(jié)選用的軸承，分析其內(nèi)部幾何關(guān)系，結(jié)合赫茲接觸理論對(duì)軸承幾何參數(shù)進(jìn)行計(jì)算，求出徑向、軸向載荷作用下鋼球的載荷分布及接觸參數(shù)值； 其次，進(jìn)行空間機(jī)械臂軸承的受力特性分析，計(jì)算出軸承所能承載的最大軸向載荷�；趥鹘y(tǒng)的赫茲接觸理論和有限元軟件ANSYS Workbench對(duì)軸向載荷作用下的軸承進(jìn)行分析，得到軸承間隙的變化規(guī)律，并將兩者進(jìn)行對(duì)比驗(yàn)證； 再次，結(jié)合軸承的工作環(huán)境，通過(guò)傳熱理論確定傳熱方式，基于摩擦生熱計(jì)算出熱載荷，并施加在有限元模型上，利用ANSYS Workbench求出軸承溫度場(chǎng)分布。而且分別研究了軸承溫度場(chǎng)隨交變溫度、轉(zhuǎn)速和載荷大小三因素的變化趨勢(shì)； 最后，在已知軸承溫度場(chǎng)分布的基礎(chǔ)上，利用ANSYS Workbench軟件對(duì)軸承進(jìn)行熱應(yīng)力耦合分析，最終得到不同環(huán)境溫度、不同軸承運(yùn)轉(zhuǎn)速度和不同工作載荷時(shí)軸承的間隙演化規(guī)律。
[Abstract]:In the space environment with large temperature difference, high vacuum and high radiation, the operating state and the force condition of the spaceflight mechanism will be affected. In this paper, the output joint of the large manipulator of the space station is taken as the research object. It breaks through the previous analysis under a single condition and focuses on the law of the clearance evolution of the joint bearing under the coupling of three factors: alternating temperature rotation speed and load. The main contents of this paper are as follows: (1) to prevent the bearing failure caused by too large or too small clearance and to ensure the safety and reliability of the space joint so as to reduce the probability of the spaceflight mechanism failure. First of all, aiming at the bearing selected by the output joint of the space manipulator, the internal geometric relationship is analyzed, and the geometric parameters of the bearing are calculated by combining with Hertz contact theory, and the radial direction is obtained. The load distribution and contact parameters of steel ball under axial load; Secondly, the mechanical characteristics of space mechanical arm bearing are analyzed. Based on the traditional Hertz contact theory and finite element software ANSYS Workbench, the bearing under axial load is analyzed. The change law of bearing clearance is obtained, and the two are compared and verified. Thirdly, combined with the working environment of the bearing, the heat transfer mode is determined by the heat transfer theory, and the thermal load is calculated based on the friction heat generation, and applied to the finite element model. The distribution of bearing temperature field is obtained by ANSYS Workbench, and the variation trend of bearing temperature field with alternating temperature, rotational speed and load is studied respectively. Finally, on the basis of known temperature field distribution of bearing, the thermal stress coupling analysis of bearing is carried out by using ANSYS Workbench software, and finally different ambient temperatures are obtained. The clearance evolution law of bearing with different operating speed and load.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH133.3

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本文編號(hào)：1409270