排序方式: 共有83条查询结果,搜索用时 250 毫秒
41.
42.
卫星编队飞行相对轨道动力学模型的比较及选用 总被引:1,自引:0,他引:1
基于动力学方法推导了几种编队飞行相对轨道动力学模型.分析比较了引力项线性化以及J2摄动引起的模型误差的数量级,给出了模型选取的参考准则以及适用条件,分析了不同模型的适用性.最后选取太阳同步轨道和静止轨道作为数值算例,选取合适的相对轨道动力学模型,验证模型选取准则的有效性.仿真结果表明一定范围内考虑^摄动能提高精度,而超出一定范围J2的引入只会增加复杂性,因此提出的模型选取准则对相对轨道动力学模型的选取有一定的参考价值. 相似文献
43.
P. Romano V. Mangano L. Ducci P. Esposito S. Vercellone F. Bocchino D.N. Burrows J.A. Kennea H.A. Krimm N. Gehrels R. Farinelli C. Ceccobello 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
We present a review of the Supergiant Fast X-ray Transients (SFXT) Project, a systematic investigation of the properties of SFXTs with a strategy that combines Swift monitoring programs with outburst follow-up observations. This strategy has quickly tripled the available sets of broad-band data of SFXT outbursts, and gathered a wealth of out-of-outburst data, which have led us to a broad-band spectral characterization, an assessment of the fraction of the time these sources spend in each phase, and their duty cycle of inactivity. We present some new observational results obtained through our outburst follow-ups, as fitting examples of the exceptional capabilities of Swift in catching bright flares and monitor them panchromatically. 相似文献
44.
45.
46.
针对某固体火箭发动机点火启动时所受的燃气载荷,用线性粘弹性有限元法分析了无缺陷药柱和含有裂纹药柱的应力—应变场,并探讨了单裂纹部位、裂纹尺寸对发动机工作安全性的影响以及多裂纹条件下,裂纹尺寸和相互位置对裂纹扩展的影响。所得到的结论对制定固体发动机失效判据有一定的参考价值。 相似文献
47.
考虑到地球扁率J_2摄动的影响,在非正交分解法的基础上,利用自由段弹道地心距迭代解析解,给出了一种弹道飞行器零射程线的计算方法。数值仿真结果表明,该方法具有很高的精度,且计算速度较快,在闭路制导能量耗散和多弹头进攻弹道设计中具有较高的应用价值。 相似文献
48.
49.
Y. Tako S. TsugaT. Tani R. AraiO. Komatsubara M. Shinohara 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(5):714-724
Human habitation and animal holding experiments in a closed environment, the Closed Ecology Experiment Facilities (CEEF), were carried out. The CEEF were established for collecting experimental data to estimate carbon transfer in the ecosystem around Rokkasho nuclear fuel reprocessing plant. Circulation of O2 and CO2, and supply of food from crops cultivated in the CEEF were conducted for the first time in the habitation experiments. Two humans known as eco-nauts inhabited the CEEF, living and working in the Plant Module (PM) and the Animal and Habitation Module (AHM), for a week three times in 2005. On a fresh weight basis, 82% of their food was supplied from 23 crops including rice and soybean, cultivated and harvested in the PM, in the 2nd and 3rd experiments. For the goats, the animals held in the experiments, all of their feed, consisting of rice straw, soybean plant leaves, and peanut shells and peanut plant leaves, was produced in the PM in the 2nd and 3rd experiments. The O2 produced in the PM by photosynthesis of the crops was separated by the O2 separator using molecular sheaves, then accumulated, transferred, and supplied to the AHM atmosphere. The CO2 produced in the AHM by respiration of the humans and animals was separated by the CO2 separator using solid amine, then accumulated, transferred, and supplied to the PM atmosphere. The amount of O2 consumed in the AHM was 46–51% of that produced in the PM, and the amount of CO2 produced in the AHM was 43–56% of that consumed in the PM. The surplus of O2 and the shortage of CO2 was a result of the fact that waste of the goats and the crops and part of the human waste were not processed in these habitation experiments. The estimated amount of carbon ingested by the eco-nauts was 64–92% of that in the harvested edible part of the crops. The estimated amount of carbon ingested by the goats was 36–53% of that in the harvested inedible part of the crops. One week was not enough time for determination of gas exchange especially for humans and animals, because fluctuation of their gas exchange was quite high. The amount of transpired water collected as condensate was 818–938 L d−1, and it was recycled as replenishing water compensating transpiration loss of nutrient solution. The amount of waste nutrient solution discharged from the PM was 1421–1644 L d−1. The waste nutrient solutions from rice and other crops were processed through micro filters (MFs) separately. The MF filtrated solutions were processed with reverse osmosis (RO) membrane filter separately and divided into filtrated water and concentrated waste nutrient solution. The concentrated waste nutrient solution from the crops other than rice was processed through an ultra-micro filter (UF) and reused, although that from rice was discharged in 2005. Concentrations of nutritional ions in the UF filtrated solution were determined, the depleted ions were added back, the UF filtrated solution was diluted with the RO membrane filtrated water, and the nutrient solution for the crops other than rice was regenerated. The nutrient solution for rice was newly made each time, using concentrated solution from an external source and the RO membrane filtrated water. Average amounts of water used in the AHM (L d−1) were determined as follows: drinking by humans (filtrated water), 1.5; cooking, etc. (filtrated water other than for drinking), 14.3; drinking by goats, 3.8; showering (hot water), 13.2; showering (cold water), 0.1; washing of hand and face and brushing teeth, 4.1; washing of dishes, dish clothes and towels, 36.4; and washing of animal holding tools, 0.3. The waste water was processed by a RO purification system and recycled for toilet flushing and animal pens washing. A circulation experiment for water was started in 2006 and a circulation experiment for waste materials is planned for 2007. In 2006, a single duration of the air circulation experiments was 2 weeks, although the human habitants were changed after 1 week. 相似文献
50.