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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Aeronautical & Space Sciences
Journal Basic Information
Journal DOI :
The Korean Society for Aeronautical & Space Sciences
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Volume & Issues
Volume 39, Issue 12 - Dec 2011
Volume 39, Issue 11 - Nov 2011
Volume 39, Issue 10 - Oct 2011
Volume 39, Issue 9 - Sep 2011
Volume 39, Issue 8 - Aug 2011
Volume 39, Issue 7 - Jul 2011
Volume 39, Issue 6 - Jun 2011
Volume 39, Issue 5 - May 2011
Volume 39, Issue 4 - Apr 2011
Volume 39, Issue 3 - Mar 2011
Volume 39, Issue 2 - Feb 2011
Volume 39, Issue 1 - Jan 2011
Selecting the target year
Efficient Hole Searching Algorithm for the Overset Grid System with Relative Body Motion
Lee, Seon-Hyeong ; Chae, Sang-Hyun ; Oh, Se-Jong ; Yee, Kwan-Jung ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 995~1004
DOI : 10.5139/JKSAS.2011.39.11.995
Object X-ray method commonly used for hole search in overset grids requires huge amount of time due to complicated vector calculations to search the cross-points as well as time-consuming hole search algorithm with respect to background grids. Especially, when the grid system is in motion relative to the background, hole points should be searched at every time step, leading to hung computational burden. To cope with this difficulties, this study presents an efficient hole search algorithm mainly designed to reduce hole searching time. To this end, virtual surface with reduced grid points is suggested and logical operators are employed as a classification algorithm instead of complicated vector calculations. In addition, the searching process is further accelerated by designating hole points in a row rather than discriminating hole points with respect to each background grid points. If there exists a relative motion, the present algorithm requires much less time because only the virtual surface needs to be moved at every time step. The hole searching time has been systematically compared for a few selected geometries.
Effect of Wrinkling on Failure Behavior of Thin Membranes
Kim, Young-Ah ; Woo, Kyeong-Sik ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1005~1012
DOI : 10.5139/JKSAS.2011.39.11.1005
In this paper, the effect of wrinkling on the failure behavior of thin membrane was studied using geometrically nonlinear shell element post-buckling analysis with global-local analysis strategy. In the analysis, double-edge notched and single-edge notched tensile specimen configurations were considered. The analyses were performed for both cases with allowing and suppressing the wrinkling deformation. The results were investigated focusing on the effect of wrinkle development on the variation of J-integral values at the cut tip. The effect of cut lengths and the specimen lengths were also systematically studied.
Cooperative Standoff Tracking of a Moving Target using Decentralized Extended Information Filter
Yoon, Seung-Ho ; Bae, Jong-Hee ; Kim, You-Dan ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1013~1020
DOI : 10.5139/JKSAS.2011.39.11.1013
This paper deals with the tracking problem of a moving target using multiple unmanned aerial vehicles. A decentralized extended information filter is designed to cooperatively estimate the position and the velocity of the moving target. The extended information filter is adopted to consider the range and the line-of-sight angle as measurement data. The decentralized scheme is applied to enhance the estimation performance using the information provided by other vehicles. Numerical simulation is performed to verify the tracking performance of the proposed decentralized filters.
A Parametric Study on Optimal Earth-Moon Transfer Trajectory Design Using Mixed Impulsive and Continuous Thrust
Lee, Dae-Ro ; No, Tae-Soo ; Lee, Ji-Marn ; Jeon, Gyeong-Eon ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1021~1032
DOI : 10.5139/JKSAS.2011.39.11.1021
This paper presents the results of a parametric study for the design of optimal Earth-Moon transfer trajectory using mixed impulsive and continuous thrust. Various types of the optimal Earth-Moon transfer trajectories were designed by adjusting the relative weight between the impulsive and the continuous thrust, and flight time. Two very different transfer trajectories can be obtained by different combination of design parameters. Furthermore, it was found that all thus designed trajectories permit the ballistic capture by the Moon gravity. Finally, the required thrust profiles are presented and analyzed in detail.
Analysis of Collision Avoidance Maneuver Frequency for the KOMPSAT-2 and the KOMPSAT-5
Kim, Eun-Hyouek ; Kim, Hae-Dong ; Kim, Eun-Kyou ; Kim, Hak-Jung ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1033~1041
DOI : 10.5139/JKSAS.2011.39.11.1033
In this paper, a collision avoidance maneuver frequency for the KOMPSAT-2 and the KOMPSAT-5 is analyzed. For the statistical prediction of the avoidance maneuver frequency, mission orbits, responsive time, accepted collision probabilities, and positional uncertainties of primary and secondary objects are considered. In addition, the collision avoidance maneuver frequency of the KOMPSAT-2 is compared to the case that NORAD catalog during one year is used to calculate that of the KOMPSAT-2. As a result, the collision avoidance maneuver frequency is one per year on average and effective factors on the statistical prediction of the avoidance maneuver frequency are investigated. Efforts to improve its prediction accuracy are also discussed.
Development of Operation System for Network of Multiple UAVs
Kim, Sung-Hwan ; Cho, Sang-Ook ; Kim, Sung-Su ; Ryoo, Chang-Kyung ; Choi, Kee-Young ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1042~1051
DOI : 10.5139/JKSAS.2011.39.11.1042
In this paper, a total operating environment equipped with onboard wireless communication systems and ground-based mission control systems is proposed for simultaneous operation of multiple UAVs. A variety of operating structures are studied and classified systematically based on types and usages of the components. For each operating system, the strength, weakness and reliability aspects are investigated. Based on these results, a proper operating system configuration is determined and components are developed for mission formation flight. Proposed system can make a formation flight of various UAVs, execute complex missions decentralizing mission to several UAVs and cooperate several missions.
Power Characteristic Variation Simulation of Hybrid Electric Propulsion System for Small UAV
Lee, Bo-Hwa ; Park, Poo-Min ; Kim, Chun-Taek ; Yang, Soo-Seok ; Ahn, Seok-Min ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1052~1059
DOI : 10.5139/JKSAS.2011.39.11.1052
It is conducted that power characteristic variation simulation of electric propulsion system that uses fuel cells, solar cells and a battery as power sources. Combining each power source, 400W electric propulsion system have been modeled and verified. In result, without active control logic, it is confirmed that battery`s power response is faster than other power sources at starting and transient condition, fuel cell and solar cell are a major electrical power during cruise condition. After completing flight, SOC is 24.2% at the winter solstice and is 93% at the summer solstice, It is revealed that active power control for sustaining proper SOC is necessary as a securing the system safety and effective power distribution.
Design and Implementation of Multi-Function Display Operational Flight Program and Middleware Using Real-Time and Embedded System Java Virtual Machine
Won, Hyeon-Kwon ; Jeong, Chai-Hun ; Choi, Kyong-Sik ; Kim, Jong-Pil ; Kim, In-Gyu ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1060~1068
DOI : 10.5139/JKSAS.2011.39.11.1060
In this paper, we present a development of an Operation Flight Program(OFP) on Real Time Operating System(RTOS) and Java Virtual Machine(JVM) of real-time and embedded system. The OFPs are consisted of Multi Function Display(MFD), Integrated Up Front Control(IUFC), Head Up Display(HUD) and Fire Control(FC) and loaded for localization Mission Computer(MC). This paper describes the structure and implementation of a MFD OFP and middleware based on Java.
Thermal Model Correlation and Heater Design Verification for LEO Satellite Optical Payload`s Thermal Analysis Model Verification
Kim, Min-Jae ; Huh, Hwan-Il ; Kim, Sang-Ho ; Chang, Su-Young ; Lee, Deog-Gyu ; Lee, Seung-Hoon ; Choi, Hae-Jin ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1069~1076
DOI : 10.5139/JKSAS.2s011.39.11.1069
All of the satellite components must be operated within the permissible temperature range during the mission in orbit. Therefore, thermal design is performed to develop verified thermal model and to secure thermal stability on the ground. In this study, thermal model correlation was performed to satisfy the criteria of correlation using ground thermal vacuum/thermal balance test results of LEO satellite optical payload. We also secured verified thermal model by controlling operating cycle of flight heaters. In addition, it was confirmed that all components are within the permissible temperature range through conducting orbit environment thermal analysis. We also secured thermal stability of the satellite.
Stakeholder`s Expectations in the National Space Exploration Enterprise
Lee, Chang-Jin ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 39, issue 11, 2011, Pages 1077~1085
DOI : 10.5139/JKSAS.2011.39.11.1077
Various stakeholder`s expectations and constraints are to be efficiently resolved into a program consensus prior to the beginning of its substantial design processes. This study focuses on the analysis of the stakeholder`s expectations in determining the design requirements at the initial stage of space exploration programs including Naro launcher and currently on-going KSLV-II program. Naro program seems to unilaterally account for the government expectations of accelerating program phase speed without making any efforts to converge various expectations from related sectors. The planning of Naro launcher is also found lack of the concept of operations (ConOps), which is of critical importance by envisaging the operational applications of end products. Similarities are found in KSLV-II program regarding the lack of implementation for stakeholder`s expectations. Moreover, the government plan for KSLV-II disclosed without considering all expectations and other comments. The increase in design conflicts and program uncertainties would be unavoidable, if the government plan for KSLV-II would be insisted. It is required to modify the government plan and to establish the ConOps with the convergence of stakeholder`s expectations at this early stage of the program.