Space X公司4月9日在第5次测试中,终于在海上成功回收猎鹰9号的第一级火箭。人类历史上首次海上火箭回收由此实现,这意味着火箭回收除陆地外,又多了一个新的选择,低成本太空运输时代或从此开启。这也是Space X探索火箭可重复利用技术的...Space X公司4月9日在第5次测试中,终于在海上成功回收猎鹰9号的第一级火箭。人类历史上首次海上火箭回收由此实现,这意味着火箭回收除陆地外,又多了一个新的选择,低成本太空运输时代或从此开启。这也是Space X探索火箭可重复利用技术的一个重要里程碑,是人类迈进宇宙的一大步。展开更多
“哥伦比亚”号航天飞机（STS Columbia OV-102）是美国航空航天局所属的航天飞机之一。“哥伦比亚”号是美国航天飞机机队中第一架正式服役的，它在1981年4月12日首次执行代号STS—1的任务，正式开启了美国航空航天局太空运输系统计划...“哥伦比亚”号航天飞机（STS Columbia OV-102）是美国航空航天局所属的航天飞机之一。“哥伦比亚”号是美国航天飞机机队中第一架正式服役的，它在1981年4月12日首次执行代号STS—1的任务，正式开启了美国航空航天局太空运输系统计划的序章。然而很不幸的是，2003年2月1日，展开更多
This paper deals with the application of data mining techniques to the conceptual design knowledge for a LV （launch vehicle） with a HRE （hybrid rocket engine）. This LV is a concept of the space transportation, whi...This paper deals with the application of data mining techniques to the conceptual design knowledge for a LV （launch vehicle） with a HRE （hybrid rocket engine）. This LV is a concept of the space transportation, which can deliver micro-satellite to the SSO （sun-synchronous orbit）. To design the higher performance LV with HRE, the optimum size of each component, such as an oxidizer tank containing liquid oxidizer, a combustion chamber containing solid fuel, a pressurizing tank and a nozzle, should be acquired. The Kriging based ANOVA （analysis of variance） and SOM （self-organizing map） are employed as data mining techniques for knowledge discovery. In this study, the paraffin （FT-0070） is used as a propellant of HRE. Then, the relationship among LV performances and design variables are investigated through the analysis and the visualization. To calculate the engine performance, the regression rate is computed based on an empirical expression. The design knowledge is extracted for the design knowledge of the multi-stage LV with HRE by analysis using ANOVA and SOM. As a result, the useful design knowledge on the present design problem is obtained to design HRE for space transportation.展开更多
文摘This paper deals with the application of data mining techniques to the conceptual design knowledge for a LV （launch vehicle） with a HRE （hybrid rocket engine）. This LV is a concept of the space transportation, which can deliver micro-satellite to the SSO （sun-synchronous orbit）. To design the higher performance LV with HRE, the optimum size of each component, such as an oxidizer tank containing liquid oxidizer, a combustion chamber containing solid fuel, a pressurizing tank and a nozzle, should be acquired. The Kriging based ANOVA （analysis of variance） and SOM （self-organizing map） are employed as data mining techniques for knowledge discovery. In this study, the paraffin （FT-0070） is used as a propellant of HRE. Then, the relationship among LV performances and design variables are investigated through the analysis and the visualization. To calculate the engine performance, the regression rate is computed based on an empirical expression. The design knowledge is extracted for the design knowledge of the multi-stage LV with HRE by analysis using ANOVA and SOM. As a result, the useful design knowledge on the present design problem is obtained to design HRE for space transportation.
