小天體著陸器附著機構設計研究.pdf

1、南京航空航天大學碩士學位論文小天體著陸器附著機構設計研究姓名：吳志斌申請學位級別：碩士專業(yè)：飛行器設計指導教師：聶宏20081201小天體著陸器附著機構設計研究 II Abstract Small body exploration is one of the most important fields in deep space exploration. In recent 30 years, a great develop have

2、taken place in this field. NASA, ESA and JXSA have launched a series of small body spacecrafts and they promote greatly on research about small bodies. According to the trend that the spacecraft will attach and sample on

3、 the small bodies’ surface, a preliminary research on our country’s small bodies Lander attaching scheme and mechanisms is discussed based on the summary of the achievement of the attaching scheme aboard. The features of

4、 small bodies such as litter gravity, big change in temperature, irregular shape and the imprecision surface soil, deeply influence the landing and attaching concept of the spacecraft. Considering those; the following wo

5、rks are carried out: 1. Three different possible attaching technologies and the sampling methods for each one for use with small bodies are discussed, and the long-term landing technology developed in greater detail. Lo

6、ng-term landing attaching mechanisms include the absorbing mechanism and the anchoring mechanism. 2. Two kinds of absorbing mechanisms are designed for long-term landing scheme. The legs, dampers and footpads of them are

7、 analyzed. The tentative ideas of using advantage C/C composite friction disk and electromagnetic damper based on Linear Motor principle for absorbing mechanism damper are discussed. 3. The landing dynamic is analyzed an

8、d the landing virtual prototype is established with ADAMS. The objective of the simulations of the landing on a small body is the analysis and understanding of the dynamics of the Lander on impact on the small body surfa

9、ce. Some conclusions are gotten with the analysis for several conditions: the CG overlords of the spacecraft are all below the standards; when the surface friction coefficient is small, the longitudinal velocity of the s

10、pacecraft could reduce to zero, but there might be litter retained on lateral velocity, this needs the control thrust produced by the engines or anchoring force to get the Lander still. Key words: Small bodies, Lander, S