Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011最新文献_第2页

Effect of atmosphere model on suborbital launch vehicle trajectory analysis for a hypothetical launch from Turkey 大气模型对土耳其假想发射亚轨道运载火箭弹道分析的影响

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966927

I. Yaman, B. Seçkin

{"title":"Effect of atmosphere model on suborbital launch vehicle trajectory analysis for a hypothetical launch from Turkey","authors":"I. Yaman, B. Seçkin","doi":"10.1109/RAST.2011.5966927","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966927","url":null,"abstract":"There are several reference and standard atmosphere models which are claimed to be valid and accurate for different regions all over the world. Launchers, during their atmospheric flight, exposed to aerodynamic drag forces. Magnitude of these forces and trajectories of the launchers directly depend on the atmospheric conditions. It is a must to model the atmosphere accurately before the trajectory analysis in order to determine the trajectory of the vehicle precisely. Since there are no detailed atmospheric studies related to Turkey, which include atmospheric properties at high altitudes above 30 km, it is required to investigate the effect of regional and seasonal changes on a possible trajectory of launch from territory of Turkey. In this study, effect of different atmospheric conditions on the altitude and range of a vehicle is investigated. Study was performed using the real atmospheric values obtained from sounding balloon measurements and different models for higher altitudes that are not covered by the measurements. Two different locations are inspected regarding the change in atmospheric properties and one of these locations is more deeply investigated to clarify the effect of seasonal changes on a hypothetical launch of a suborbital launch vehicle. Main variable for the investigation is the atmospheric temperature over the investigated region at a certain time of year with respect to elevation.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Finite element modelling and analysis of simple lap joints 简单搭接节点有限元建模与分析

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966925

Ilker Uysal, Murat Suer, I. Ozkol

引用次数: 4

Evolution of aerospace simulation: From immersive Virtual Reality to serious games 航空航天模拟的演变:从沉浸式虚拟现实到严肃游戏

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966921

R. Stone, P. Panfilov, V. E. Shukshunov

引用次数: 43

A low cost alternative for satellites- tethered ultra-high altitude balloons 卫星的低成本替代品——系绳超高空气球

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966806

K. Izet-Unsalan, D. Unsalan

{"title":"A low cost alternative for satellites- tethered ultra-high altitude balloons","authors":"K. Izet-Unsalan, D. Unsalan","doi":"10.1109/RAST.2011.5966806","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966806","url":null,"abstract":"Geostationary and geosynchronous satellites have a wide area of application in present day technology. The main drawback for the wider usage of such satellites is their high cost of launching into their orbit. As alternatives to conventional rocket launching, launching by high muzzle speed guns or by electric railguns have been proposed. However, it is hereby advocated that aerostats, stratospheric or mesospheric balloons tethered to a fixed point on the earth can also be used to fulfil the same tasks within a limited area of coverage. However, it is possible to widen the area of coverage by using a constellation of such balloons, presumably at a fraction of the cost of satellite launching. Presently, aerostats at about a few kilometers height are being used for a number of purposes, including border monitoring. The idea of tethered balloons reaching the lower parts of the stratosphere has been studied in 1960's for atmospheric research and successful results from prototype balloons have been obtained. The main problem related to high altitude aerostats has been found that extreme drifting loads are being induced by high altitude winds during the ascent (launching) and descent (recovery) phases. In the light of development of new high performance materials, as well as the development of superpressure balloons, it is now proposed to re-consider the same concept as a platform for high altitude devices used for communications, media broadcasting, environmental monitoring via optical or SAR imagery, monitoring for border security and illegal trafficking. Also, the possibility of two stage launching, ie, launching an aerostat from a high altitude airship shall be addressed. It is considered that the most convenient altitude for such aerostats is the stratopause region, with pressures at the order of 1 hPa pressure or 48 000–50 000 meters above the sea level.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"35 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129423663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Scalability and dynamic stability of hybrid rocket engines 混合动力火箭发动机的可扩展性和动态稳定性

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966936

Teodor-Viorel Chelaru, Mingireanu Florin, E. Vasile, Neagu Ion

引用次数: 2

Skies, future and curricula: Content of Astronomy and Space Sciences material in pre-University level courses Karachi 天空、未来和课程:卡拉奇大学预科课程中的天文学和空间科学材料内容

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966913

Ingila Rahim, M. Ansari, M. A. K. Yousuf Zai

{"title":"Skies, future and curricula: Content of Astronomy and Space Sciences material in pre-University level courses Karachi","authors":"Ingila Rahim, M. Ansari, M. A. K. Yousuf Zai","doi":"10.1109/RAST.2011.5966913","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966913","url":null,"abstract":"In all the eras of known human civilization, the role of Astronomy and Space Science has been dominant. The fate of human beings was so much associated with the blessings of the skies that such topics became essential part of myth, legend, religion, philosophy, poetry and science in all the ages. Divine on one hand and most earthly on the other, these topics acclaimed paramount at all theological, philosophical, scientific and academic forums. Most of the modern developments are indebted in one or the other way to the developments in these areas. Irrespective of the importance of Astronomy and Space Science as individual subjects, their role in the development of intellect and academic enhancement cannot be ignored. Because of this, in developed countries it is managed to make these subjects part of the curricula as independent subjects. Otherwise, selected topics from these areas are included in the curricula of other related subjects. As is the case with most of the underdeveloped countries of the world, curricula in Pakistan too are deficient in this regard. This is most true in particular, at the school and college levels.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121660454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Verification of control moment gyroscopes based attitude control systems for agile satellite missions 基于控制力矩陀螺仪的敏捷卫星姿态控制系统验证

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966897

Emre Yavuzoğlu, E. Topal, A. Kutlu, Halime Urek, M. E. Gulluoglu, O. Tarakcioglu, Emre Yurtoglu, Değer Akin, K. Çelik, C. Ozyurt, K. Aydin, K. Yilmaz

引用次数: 7

Energy and distance factor based routing protocol for wireless sensor networks using mobile agents 用于使用移动代理的无线传感器网络的基于能量和距离因子的路由协议

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966865

A. Akbulut, Cihangir Parmaksizoglu, A. Zaim, G. Yilmaz

{"title":"Energy and distance factor based routing protocol for wireless sensor networks using mobile agents","authors":"A. Akbulut, Cihangir Parmaksizoglu, A. Zaim, G. Yilmaz","doi":"10.1109/RAST.2011.5966865","DOIUrl":"https://doi.org/10.1109/RAST.2011.5966865","url":null,"abstract":"The wireless sensor networks are networks of compact micro-sensors for data acquisition or monitoring some environment characteristics, such as temperature, sound, vibration, pressure and motion. These sensors are embedded devices capable of data communication. In many applications, sensor nodes are distributed or deployed over a geo-graphically large area. Due to their structure, data of measured values must be transferred among stations through these sensor nodes. For this reason a successful, energy efficient, fault tolerant routing protocol should be implemented to pre-vent data loss and other challenges within limited energy levels. This paper presents an agent based routing algorithm for wireless sensor networks, based on the selection of the idea of active nodes. Our proposed routing algorithm is related with energy and distance factors of each nodes. The main objective is to increase the lifetime of a sensor network while not compromising data delivery. Critical tasks such as measuring, analyzing and monitoring of energy levels of nodes are handled by these autonomous mechanisms.","PeriodicalId":285002,"journal":{"name":"Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130098942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

REKF and RUKF development for pico satellite attitude estimation in the presence of measurement faults 存在测量故障的微卫星姿态估计的REKF和RUKF发展

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966972

H. Soken, C. Hajiyev

引用次数: 7

GEZGİN-2: Image processing subsystem of RASAT GEZGİN-2: RASAT的图像处理子系统

Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011 Pub Date : 2011-06-09 DOI: 10.1109/RAST.2011.5966981

N. Ismailoglu, B. Vargun, R. Sever, B. Okcan, K. Karakus, K. Kapucu, R. Oktem

引用次数: 3