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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 41, Issue 12 - Dec 2013
Volume 41, Issue 11 - Nov 2013
Volume 41, Issue 10 - Oct 2013
Volume 41, Issue 9 - Sep 2013
Volume 41, Issue 8 - Aug 2013
Volume 41, Issue 7 - Jul 2013
Volume 41, Issue 6 - Jun 2013
Volume 41, Issue 5 - May 2013
Volume 41, Issue 4 - Apr 2013
Volume 41, Issue 3 - Mar 2013
Volume 41, Issue 2 - Feb 2013
Volume 41, Issue 1 - Jan 2013
Selecting the target year
Study on the Aerodynamic Analysis for Wings with Various Shapes Using Lifting-line Methods
Lee, Chang Ho ; Kang, Hyung Min ; Kim, Cheolwan ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 931~939
DOI : 10.5139/JKSAS.2013.41.12.931
In this paper, we try to find the lifting-line method which is applicable to the conceptual design of aircraft wings, and analyze the accuracy and coverage of the method. Two methods that are extended from the lifting-line theory of Prandtl are selected. One of the methods is Weissinger's method which imposes the velocity boundary condition at the control points located at the quarter chord, and the other is Phillips's method which combines the three-dimensional vortex lifting law. Calculations are performed for an elliptic wing, a swept back wing, and a tapered unswept wing with dihedral angle and geometric twist. The aerodynamic data of the potential flow such as spanwise distributions of circulation and downwash, lift and induced drag are obtained through calculations, and these data are compared with theoretical results and wind tunnel test data. As a result, Weissinger's method showed good accuracy and reliability regardless of wing shapes, but Phillips's method revealed inaccurate results for a swept back wing.
Wrinkle Reduction Design Method of Triangular Solar Sail
Bae, Hongsu ; Woo, Kyeongsik ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 940~949
DOI : 10.5139/JKSAS.2013.41.12.940
In this paper, wrinkle reduction design was studied for triangular sail. Wrinkles in the solar sail membrane can change the load path and surface topology which may have an adverse effect on propulsion performance and controllability. In this study, wrinkle reduction strategies of adjusting cable angle, catenary and catenary-wire schemes were considered and the design parameters for wrinkle reduction were systematically investigated.
Design and Analysis of Korean Lunar Orbiter Mission using Direct Transfer Trajectory
Choi, Su-Jin ; Song, Young-Joo ; Bae, Jonghee ; Kim, Eunhyeuk ; Ju, Gwanghyeok ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 950~958
DOI : 10.5139/JKSAS.2013.41.12.950
The Lunar orbiter is expected to be inserted into a ~300km low Earth orbit using Korea Space Launch Vehicle-II(KSLV-II). After the states are successfully determined with obtained tracking data, the Trans Lunar Injection(TLI) burn has to be done at appropriate epoch to send the lunar orbiter to the Moon. In this study, we describe in detail the mission scenario of the Korean lunar orbiter from the launch at NARO Space Center to lunar orbit insertion(LOI) stage following direct transfer trajectory. We investigate the launch window including launch azimuth, delta-V profile according to TLI and LOI burn positions. We also depict the visibility conditions of ground stations and solar eclipse duration to understand the characteristics of the direct transfer trajectory. This paper can be also helpful not only for overall understanding of
trend by changing TOF and coasting time but for selecting launch epoch and control parameters to decrease fuel consumption.
Fatigue Analysis to Determine the Repair Limit for the Damaged Fastener Hole of Aging Aircraft(P-3CK)
Kim, Young-Jin ; Kim, Hyeung-Geun ; Kim, Chang-Young ; Chang, Joong-Jin ; Lee, Mal-Young ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 959~966
DOI : 10.5139/JKSAS.2013.41.12.959
In this study, based on P-3CK project using aging aircraft without any design information, the structural assessments of fastener holes to repair the short edge distance defects are investigated. For this purpose, the nacelle longeron which has many defects is selected and then conservative stress is calculated by performing the static analysis of 1.5ED, 1.8ED, 2.0ED defects of longeron fastener holes. This result applies to TWIST standard load spectrum to generate flight load spectrum. Then the crack growth analysis is performed by using flight load spectrum. Through this, the validity of a repaired fastener hole is evaluated. Finally, the standard of repair and the period of maintenance for a defected fastener hole are established.
Fatigue Strength of Composite Joint Structures Reinforced by Jagged Shaped Stainless Steel Z-pins
Choi, Ik-Hyeon ; Lim, Cheol-Ho ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 967~974
DOI : 10.5139/JKSAS.2013.41.12.967
Recently the authors had proposed the z-pinning patch concept to simply manufacture z-pinned composite structures at industrial production site and manufactured composite single-lap shear joint specimens using the concept. Through static tensile test on the specimens they had obtained 54~68% improvement of the joint strength. As a sequential study of it, in this study, fatigue test has performed to measure an improvement of joint strength under cyclic loading. The z-pin's material is stainless steel and its surface was specially machined into zagged shapes and chemically corroded to increase the connection force with composite materials. Approximately 98~125% improvement of the joint strength under cyclic loading was obtained.
A Study on Fabrication of Monolithic Lightweight Composite Electronics Housing for Space Application
Jang, Tae Seong ; Seo, Jung Ki ; Rhee, Juhun ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 975~986
DOI : 10.5139/JKSAS.2013.41.12.975
This paper dealt with the fabrication and performance evaluation of the electronics housing made of lightweight composite materials, aiming at the enhancement of satellite mass savings by replacing conventional aluminum alloy widely used for satellite avionics with lightweight composite material. For this purpose, a fabrication process was designed to overcome low machinability of CFRP and to minimize the post-treatment. The composite housing with grid-stiffened and monolithic frame was made using co-curing method. Its performance was also evaluated regarding endurance, stiffness, thermal conductivity, electrical grounding, EMI protection and radiation shielding. The composite housing can provide the considerable mass savings over the aluminum housing with same dimension.
Vibration Reduction Devices for Korean Utility Helicopter
Jung, Se-Un ; Kwak, Dong-Il ; Kim, Se-Hee ; Choi, Jong-Ho ; Shim, Dai-Sung ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 987~993
DOI : 10.5139/JKSAS.2013.41.12.987
Korean Utility Helicopter(KUH) is the first korean-developed helicopter. Its first flight was performed in March 2010 and then its development was completed successfully by June 2012. During flight test phase, KUH faced various vibration problems and appropriate vibration-reduction devices were designed and applied to solve the problems. The vibration-reduction devices were applied to main rotor blades, main gear box(MGB) supporting structure, cockpit, cabin and pilot seats to reduce rotor-induced 4/rev vibration. Also, dome-fairing was introduced in order to reduce the tail-shake vibration. This paper shows design technique and flight test results for vibration-reduction devices that have been incorporated into KUH.
A Way to Perform a Helicopter PFAT by KUH Case Study
Lee, Sangmok ; Hwang, Jungsun ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 994~1001
DOI : 10.5139/JKSAS.2013.41.12.994
Process of helicopter development is divided in design, manufacture and test & evaluation phase. Test & evaluation is performed step by step in order of component test, rig test, system ground test and flight test. After completing ground test and before first flight, US military specification requires 50hrs-PFAT in order to assure flight safety. PFAT is the test which requires tie-down and severe load imposition and it needs special ground test vehicle which is similar to helicopter prototype as well as much cost and period. In case of KUH, we have performed tailored PFAT considering KUH development environment. In this paper, we propose a proper way to perform the PFAT in accordance with development environment by giving KHU PFAT procedure and result.
A Study on Voice Communication Quality Improvement of Intercom System for KUH
Kim, Young Mok ; Chang, Joong Jin ; Jun, Byung Kyu ; Kim, Chang Young ; Jeong, Jin Woong ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 1002~1010
DOI : 10.5139/JKSAS.2013.41.12.1002
Intercom System(ICS) of Korean Utility Helicopter(KUH) is an essential equipment for pilot to perform flight mission and it consists of communication system of KUH with VHF-FM radio set and U/VHF-AM radio set. It provides pilots and crews with internal communication, external communication and audible alarm. It has function of controlling volume and selecting two communication modes, normal mode and backup mode. This paper summarizes pilot comments in flight test which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.
A Study on Cockpit Voice Command System for Fighter Aircraft
Kim, Seongwoo ; Seo, Mingi ; Oh, Yunghwan ; Kim, Bonggyu ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 1011~1017
DOI : 10.5139/JKSAS.2013.41.12.1011
The human voice is the most natural means of communication. The need for speech recognition technology is increasing gradually to increase the ease of human and machine interface. The function of the avionics equipment is getting various and complicated in consequence of the growth of digital technology development, so that the load of pilots in the fighter aircraft must become increased since they don't concentrate only the attack function, but also operate the complicated avionics equipments. Accordingly, if speech recognition technology is applied to the aircraft cockpit as regards the operating the avionics equipments, pilots can spend their time and effort on the mission of fighter aircraft. In this paper, the cockpit voice command system applicable to the fighter aircraft has been developed and the function and the performance of the system verified.
A Conceptual Study on Standard Architecture Design for the Next Generation Satellite OBC
Lee, Yunki ; Kim, Jihoon ;
Journal of the Korean Society for Aeronautical & Space Sciences, volume 41, issue 12, 2013, Pages 1018~1024
DOI : 10.5139/JKSAS.2013.41.12.1018
On-Board computers (OBC) for LEO & GEO satellites have been developed with their own dedicated architecture so far even though they have many similar functionalities. In this paper, we present a conceptual study results of standard OBC architecture design and propose the domestic development plan for the next generation satellite OBC. Proposed architecture is highly flexible and can be used at LEO/MEO/GEO and Moon Explorer/Deep Space Probe. Also, we introduce current status of standard OBC which is under development.