Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
Editor in Chief :
Volume & Issues
Volume 17, Issue 4 - Dec 2009
Volume 17, Issue 3 - Sep 2009
Volume 17, Issue 2 - Jun 2009
Volume 17, Issue 1 - Mar 2009
Selecting the target year
Surge Control of Small Turbojet Engines with Fuzzy Inference Method
Jie, Min-Seok ; Hong, Seung-Beom ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 1~7
The surge control system in unmanned turbojet engine must be capable of accounting uncertainties from engine transient conditions, random fluctuations of key parameters such as air pressure and fuel flow and engine modeling errors. In this paper, taking into consideration of its effectiveness as well as system stability, a fuzzy PI controller is proposed. The role of the fuzzy PI controller is to stabilize the unmanned aircraft upon occurring unexpected engine surge. The proposed control scheme is proved by computer simulation using a linear engine model. The simulation results on the state space model of a small turbojet engine illustrate the proposed control system achieves the desired performance.
An Experimental Study on Aerodynamic Characteristics of a Flapping Wing
Song, Woo-Gil ; Chang, Jo-Won ; Jeon, Chang-Su ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 8~16
An experimental study was carried out to investigate aerodynamic characteristics on reduced frequency of flapping wings. The half span of the wing is 28cm, and the mean chord length of wing is 10cm. In flight, the Reynolds Number range of birds is about
, and the reduced frequency during a level flight is 0.25. The experimental variables of present study were set to have similar conditions with the bird flight's one. The freestream velocities in a wind tunnel were 2.50, 3.75 and
, and the corresponding Reynolds numbers were
, respectively. The wing beat frequencies of an experimental model were 2, 3 and 4Hz, and the corresponding reduced frequency was decided between 0.1 and 0.5. Aerodynamic forces of an experimental flapping model were measured by using 2 axis load-cell. Inertial forces measured in a vacuum chamber were removed from measuring forces in the wind tunnel in order to acquire pure aerodynamic forces. Hall sensors and laser trigger were used to make sure the exact position of wings during the flapping motion. Results show that the ratio of downstroke in a wing beat cycle is increased as a wing beat frequency increases. The instantaneous lift coefficient is the maximum value at the end of downstroke of flapping wing model. It is found that a critical reduced frequency with large lift coefficient is existed near k=0.25.
GPS L5 Acquisition Schemes for Rapid Code Phase Search and Fine Doppler Determination
Joo, In-One ; Choi, Seung-Hyun ; Kim, Jae-Hyun ; Shin, Chun-Sik ; Lee, Sang-Uk ; Kim, Jae-Hoon ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 17~24
According to the GPS modernization, L5 is the third civilian GPS signal, broadcasts in a radio band reserved exclusively for aviation safety services. However, as the code length of GPS L5 is ten times longer than that of GPS L1, the acquisition processing time in GPS L5 takes longer than that of L1. This characteristics make the code phase detected initially change and cause the tracking loop to unlock. In order to overcome this problem, this paper proposes L5 acquisition schemes for the rapid code phase re-search and the fine doppler determination. The feasibility of the proposed scheme is demonstrated through the simulation results.
Case Study on Improvement of Reliability Prediction Accuracy in Development Phase for Aircraft
Kim, Young-Il ; Byun, Kwang-Sik ; Kim, Han-Tai ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 25~31
In development phase of the Aircraft Systems, the reliability prediction of electronic equipments are usually performed using MIL-HDBK-217. The reliability of fielded electronic systems, however, used to be underestimated with MIL-HDBK-217. To solve this problem, some alternatives are suggested and Telcordia SR-332 is among them. In this case study, the reliability of ESU which controls gas turbine engine is predicted using Telcordia SR-332 along with the development test data. The predicted reliabilities of ESU using Telcordia SR-332 and MIL-HDBK-217 are also compared. As a result this case study showed that the predicted reliability using Telcordia SR-332 was better close to field(operation) reliability than MIL-HDBK-217.
A study on the reduction in Ground Turbulence by the fence in the vicinity of airport runway
Sheen, Dong-Jin ; Hong, Gyo-Young ; Kim, Young-In ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 32~41
This paper presents the work being carried out in order to reduce the ground turbulence by the fence in the vicinity of airport runway. In preliminary study, we knows that cross-wind effect in the vicinity of runway is highly dependent on the shape of the buildings and have predicted results confirmed reduction of wind-effect by doing that set up the building with a fence, terraced shape or gap. This study is to figure out effect of ground turbulence by the building with fence, which is changing fence height, in using two-dimensional computational fluid dynamics analysis.
A Study on the characteristics of the Signals of AE according to Fracture mode of CFRP
Lee, Kyung-Won ; Kim, Jong-Hyun ; Kim, Jae-Seong ; Lee, Bo-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 42~47
Recently, the wide range of the composite materials is used for the making airplanes, trains and automobiles body for the lightweight. Despite having complex structures, composite materials usually have well defined mechanical characteristics. However, composite materials are difficult to understand the fracture mechanism clearly by simple mechanical test. Nondestructive evaluation (NDE) combined with mechanical testing can play a more important role and especially Acoustic Emission Testing (AET) would become known to be a useful tool to assess damage and fracture behavior of composites. In this study The experiment was performed to acquire the acoustic emission signal during tensile test using unidirectional CFRP specimen and the data was analyzed the acoustic emission parameters with the waveform.
Implementation of the Aural Cueing System of the Reconfigurable Tactical SFTS for the Rotor Aircraft
Hong, Seung-Beom ; Choi, Youn-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 48~54
We implemented the Aural Cueing System(ACS) system of the reconfigurable tactical trainer(RTT) for th rotor aircraft. RTT provides a collective training system to meet aviation training requirements and supports organizational training for aviations units in combined arms collective training and mission rehearsal. ACS handles the volume, pitch and repetition of the digitally stored sounds based on commands it receives from an UDP/IP. In this paper, we explained and implemented the conceptual and detail design the ACS system for the rotor aircraft such as AH-1H(Iroquios), UH-60(Blackhwak), AH-1(Cobra) etc. The conceptual design composed of the sound cueing data analysis, sound modelling which is inner, outer, weapon and warn environment of rotor aircraft, sound synthesis and replay.
Study on the Specification and Operation Plan of the Meteorological Purpose Aircraft
Han, Kyoung-Keun ; Kim, Young-Chul ; Park, Soo-Bok ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 55~62
The Prime objectives of this study are to identify and analyze possible solutions and select a solution for the specification and operation plan of the meteorological purpose aircraft in Korea. Infrastructure like meteorological purpose aircraft and aircraft operating systems should be set up and their efficient plan must be established to improve meteorological technic in Korea. As a result of the study, we have found that the turboprop engine powered aircraft is the most suitable to initial model for the meteorological purpose aircraft. It was found that the indirect operation method might be the best solution, also. The results of this study may be useful to make decision for selecting specification and operation of the meteorological purpose aircraft.
A study on the diversification in revenue sources for Incheon International Airport Based on other airports in the foreign countries
Kwon, Tae-Hoon ; Kim, Kee-Woong ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 63~69
Incheon International Airport as the gateway to Korea is having the happiest time with those honorable prizes. But in these days, the trend of aviation is changing rapidly, so many rival airports in the world as well as north-east asian countries are rushing to find new revenue sources not to be turned over. Hence Incheon International Airport should push into fresh fields or create new sources of business keeping innovation by making foreign airports its role model. This study brings up some new profit models of foreign airports; Malaysia's Kuala Lumpur International Airport, China's Xiamen Aviation Industry Zone, German's Frankfurt Fraport Airports Group. This study analyzes the status of listed airports and presents strategies after investigating whether they are suitable for and compatible to Incheon International Airport.
A Study on B737NG Aircraft Tail Strike during Takeoff
Noh, Kun-Soo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 70~75
According to the aviation statistics, tail strike incidents and accidents are cyclic. Although many tail strikes occurred during takeoff, these are less than during landing cases. Many cases are related on human factors. In my opinion it is possible to analyze the causes of takeoff tail strikes to some extent. There are major casual factors of tail strike during takeoff such as; (1) Mis-trimmed horizontal stabilizer (2) premature rotation prior to
(3) Excessive pitch up rate during rotation (4) Improper use of the flight director. Among these causes improper use of flight director is excluded in this paper because it is recommended that pilot should use flight director after airborne. So I analyzed the other three causes as following. Firstly, because mis-trimmed stabilizer is related to center of gravity(CG), the relationship between stabilizer and CG is reviewed. Secondly, concerned premature rotation prior to
I reviewed the background of rotation speed(
) establishment and analyzed theoretically what speed leads to tail strikes. Thirdly, concerning excessive pitch up rate during rotation I analyzed what excessive pitch up rate can decrease ground clearance while using FDR data.
The dynamic trends and development strategy of Ganwon-do's Aviation and Tourism Industry
Bae, Jung-Nam ; Seo, Hwan-Joo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 76~84
This study analyzes the trends and features of Gangwon-do's aviaion and tourism industry using data published by the National Statistical Office. The categorization of tourism industry was based on the definition and category proposed by the OECD, WTO and Korea Culture Tourism Institution. Gangwon-do showed that the weight in wholesale, hotels, construction, restaurant and catering in the total number of tourism business, the number of workers, business sales and business operating profit exceed 85%. To improve the overall competitiveness of the tourism industry, it was suggested that Gangwon-do should work on the policy of expanding business in scale. This paper investigates also the role of aviation in the development of Gangwon-do's tourism industry.
Investigation of Regulations and Bird Strike Problems
Choi, Youn-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 85~93
Bird strike is big issue in aviation. Because a bird strike causes not only an aircraft damage but also a fatality, aviation societies are gearing up to prevent a bird strike. However, the accidents is not going down yet. Annal average of bird strikes in Korea is 1.15 accidents per ten thousand of flight, which is lower than the other country, for example 1.84 accidents in France and 2.38 accidents in Switzerland, 1.15 accidents. In the U.S.A, there are 89,727 accidents for the 19 year(1990-2008). Also flight delay is total 637,692 hours. The cost is total 350,258 billion dollar and 18,435 billion dollar per year. In related with those data's, this research is about the current and legal status of the bird strike. Also it will be useful to establish aviation safety policy and manage the bird strike.
Considerations for the 2009 Montreal Two New Air Law Conventions (Unlawful Interference and General Risk Conventions) by ICAO
Kim, Doo-Hwan ;
Journal of the Korean Society for Aviation and Aeronautics, volume 17, issue 4, 2009, Pages 94~106