틸트로터 항공기 비선형 시뮬레이션 프로그램 개발

유창선,최형식,박범진,안성준,강영신,Yoo, Chang-Sun,Choi, Hyung-Sik,Park, Bum-Jin,Ahn, Sung-Jun,Kang, Young-Shin 제어로봇시스템학회 2005 제어·로봇·시스템학회 논문지 Vol.11 No.3

VTOL(Vertical Take-Off and Landing) aircraft is attractive due to the reason that it is not necessary to have long runway. However a rotorcraft has a definite limitation to fly at the high speed due to the stall at the tip of rotor. To solve this problem, tilt rotor, tilt wing and lift fan were researched and developed. It was verified that the tilt rotor aircraft among them was more effective in disk loading. On this basis, the tilt rotor aircraft has been made into XV-15, V-22, BA-609 and Eagle Eye. This paper shows a nonlinear simulation program for general tilt rotor aircraft that was developed in order to validate the flight characteristics of tilt rotor aircraft and verified through the simulation analysis.

축소형 틸트로터 무인기의 안전줄 호버 시험

강영신 ( Young Shin Kang ),박범진 ( Bum Jin Park ),유창선 ( Chang Sun Yoo ),장성호 ( Sung Ho Chang ),최성욱 ( Seong Wook Choi ),구삼옥 ( Sam Ok Koo ) 한국항공운항학회 2007 한국항공운항학회지 Vol.15 No.4

Tilt rotor aircraft can take off and land vertically and cruise faster than any other helicopter. A scaled flight demonstration model of a tilt rotor aircraft has been developed by KARI. Because the flight characteristics of tilt rotor are not well known, the developed scaled model would be helpful to evaluate flight control algorithm of a full scale aircraft. The tethered hover test has been performed in order to improve hover flight characteristics of tilt rotor aircraft prior to flight test of the small scaled model. During the tethered hover test, the performance of rotor speed governor, rate SAS (Stability Augmentation System) and control surface mixers have been evaluated. We expect that the results of real flight hover test would be quite same as tethered hover test. Therefore the tethered hover test results will reduce the risk of flight test properly by fixing some of hidden problems which might occur during the flight test. This paper presents the results of tethered hover test in detail and shows how it could be final ground test before flight test. The control mixer gain and rate SAS feedback gains were modified in order to get higher controllability and stability during the tethered hover flight. The rotor governor showed that it could keep rotor RPM constant with very small deviation even during severe pilot collective input change. The tethered hover test results gave pilot and engineers confirmation and experience about the scheduled flight test.

틸트로터 무인기 함상이착륙 위한 파고운동 해석 및 시뮬레이션

유창선(Chang-Sun Yoo),조암(Am-Cho),박범진(Bum-Jin Park),강영신(Young-Shin Kang) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.9

오늘날 무인기는 기술 발전을 통해 육해상의 다양한 분야에서 이용되고 있다. 한국항공우주연구원(KARI)에서는 육상용 수직이착륙기로 개발된 틸트로터 무인기를 해상에서 운용할 수 있도록 임무영역 확장을 고려하고 있다. 틸트로터 무인기의 효과적인 해상운용을 위해서는 함상이착륙이 필요하지만 해상은 지상에 비해 염분, 연무, 바람등 기상영향을 많이 받는다. 또한 지상과는 달리 선박 운동으로 인한 착륙지점의 운동이 발생하며, 자동 함상착륙을 어렵게 만든다. 이러한 무인기 함상이착륙을 위하여 본 논문에서는 파고에 따른 선박 운동을 모델링 하고, 무인기 시뮬레이터를 통해 시험평가한 결과를 제시하고 있다. The mission of UAV has been expanded from a land to an ocean based on an enhancement of its technologies. Korea Aerospace Research Institute (KARI) also tries to expand the mission of tilt rotor UAV to an ocean, in which the shipboard landing of UAV is required. However the environment of an oceanic operation is severer than that of land due to salty, fogy, and windy condition. The landing point for automatic landing is not fixed due to movement of shipboard in roll, pitch, and heave. It makes the oceanic operation and landing of UAV difficult. In order to conduct an oceanic operation of tilt rotor UAV, this paper presents that the sea wave modeling according to the sea state is conducted and the shipboard landing of tilt rotor UAV under the sea wave is tested and evaluated through the flight simulator for UAV.

패러티 공간을 이용한 2개 GPS 파라미터 고장진단

유창선(Chang Sun Yoo),안이기(Iee Ki Ahn),이상정(Sang Jeong Lee) 한국항공우주학회 2003 韓國航空宇宙學會誌 Vol.31 No.6

안정성 및 조종성 증강장치를 고려한 항공기의 강인제어 파라미터 최적화

유창선(Chang-Sun Yoo),김종철(Jong-Chul Kim),아나톨 튜닉(A. A. Tunik),비탈리 보그라드(V. M. Bograd) 한국항공우주학회 2000 韓國航空宇宙學會誌 Vol.28 No.4

ADS-B 기반의 무인항공기 충돌회피 기술동향

유창선(Yoo, Chang-sun) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.2

무인항공기가 다양한 분야에서 활용되고 기술발전이 기대되면서 민간항공 분야에서 유인항공기가 비행하는 국가공역에 진입이 국제적으로 논의되고 있으며 충돌감지 및 회피기술이 중요한 현안으로 제기되고 있다. 무인기의 충돌 감지 수단으로 다양한 센서가 활용될 수 있지만 차세대 항행감시 수단인 ADS-B가 소형 경량, 저비용으로 다양한 비행정보를 보다 정확하고 빠르게 제공할 수 있어서 무인기 사용에 적합한 것으로 인식되고 있다. 여기서는 항공분야에서의 충돌감지 및 회피기술, ADS-B 기술, 그리고 이를 무인기에 적용한 사례를 통하여 최근의 ADS-B 기반의 무인기 충돌피회 기술동향을 기술하였다. UAV(Unmanned Aerial Vehicle) has been used in a variety of field reflecting the related technology remarkably enhanced recently. The integration of UAV into the national airspace has been addressed all over the world and the technology for sense and avoid is considered as one of the important issues. The ADS-B(Automatic Dependent Surveillance - Broadcast) is thought to be more efficient than other sensors - vision, radar, TCAS since it can provide more precise and faster update rate of flight information with small size and low weight at low price. This report presents the current status of the collision detection and avoid, ADS-B technologies and their application to the UAV.

켈로이드와 비대 흉터에서 Triamcinolone Acetonide와 5-FU (5-Fluorouracil)/Triamcinolone Acetonide 혼합제제의 병변내 주사요법에 관한 비교 연구

유창선 ( Chang Sun Yoo ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2012 大韓皮膚科學會誌 Vol.50 No.2

Background: Keloids and hypertrophic scars may complicate wound healing secondary to trauma or surgery. They are benign growths of dermal collagen that usually cause major physical, psychological, and cosmetic problems for patients. Objective: The purpose of this study was to evaluate the efficacy of using a 5-FU (Fluorouracil)/Triamcinolone acetonide (TCN) mixture to treat keloids and hypertrophic scars. Further, the results were compared via TCN alone. Methods: Patient chart from 2007 to 2011 were reviewed. Patients were stratified into 2 groups: (1) intralesional injection of TCN 0.1 ml (40 mg/ml) mixed with 5-FU 0.9 ml (50 mg/ml), every 2 weeks; (2) intralesional injection of TCN (20 mg/ml), every 2 weeks. Lesions were assessed for height, erythema, pliability, pruritus, pain/tenderness, patient-self assessment and side effects at baseline (initiation of treatment) and at weeks 2, 4, 6. Results: There has been 23 patients (43 lesions) that completed the study. At the 2, 4, 6 week visits, both groups showed an acceptable improvement in all nearly parameter., However, in comparison between the groups, there was no statistically significant differences (p>0.05). Complications such as injection pain and hyperpigmentation were seen in both treatment groups. Conclusion: The overall efficacy of 5-FU/TCN mixture was comparable with TCN alone. (Korean J Dermatol 2012;50(2):123~129)

항생제 반응검사 후 발생한 피부 림프모양 과다형성

유창선 ( Chang Sun Yoo ),신수정 ( Soo Jung Shin ),길민성 ( Min Seong Kil ),박주혁 ( Ju Hyuk Park ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.2

Cutaneous lymphoid hyperplasia (CLH, pseudolymphoma) refers to a heterogeneous group of benign reactive T- and/or B-cell lymphoproliferative diseases of the skin, that resemble cutaneous lymphoma both clinically and histologically. Despite the unknown causes of CLH development, various stimuli can induce CLH, such as medications, infections, insect bites, photosensitivity and foreign agents. To date, there has been no reported case of CLH development after an allergy skin test of antibiotics. Thus, we report a patient who developed CLH following an allergy skin test of antibiotics. He was a 21-year-old man who presented with 1.5×1.5 cm sized erythematous plaque with yellowish crusts on his right forearm that showed features of a CLH, based on histopathologic assessment. (Korean J Dermatol 2012;50(2):142~146)

고흥항공센터 ADS-B 구축 및 운용시험

유창선(Chang-Sun Yoo),송복섭(Bok-Sub Song),조암(Am Cho),성기정(Ki-Jung Sung),구삼옥(Sam-Ok Koo) 한국항공우주연구원 2014 항공우주기술 Vol.13 No.1

고흥항공센터는 전남 고흥 간척지에 위치하며 길이 700m, 폭 25m의 활주로를 통해 국내에서 개발된 무인기의 비행시험장으로 활용되고 있으며 비행체 조립 및 점검을 위한 시험동을 갖추고 있다. 항공센터에서 이루어지는 개발 항공기들의 항공안전을 위하여 비행시험 지원설비를 구축하고 있으며 현재 지상감시시설로서 1090ES ADS-B를 구축하였다. ADS-B는 차세대 항행감시 장비로서 위성항법과 데이터 통신을 기반으로 항행정보를 실시간으로 공유할 수 있으며 구축된 ADS-B 지상국과 ADS-B 송신기간 지상 및 비행시험을 통하여 ADS-B 지상국의 정상적인 운용과 비행시험 활용 가능성을 확인하였다. Goheung aeronautical center is located in the area of Goheung of which land is reclaimed from sea and has a runway of length 700m, width 25m with test facility which has been used for flight test of UAV and small aircraft. To support the enhancement of aircraft safety, 1090ES ADS-B ground system as the ground surveillance system has been implemented. ADS-B system based on GPS and digital data link provides the function of enhancing the aircraft safety through flight information among aircrafts. This paper gives the result that the implementation of ADS-B ground system and the flight test with onboard ADS-B transmitter has been conducted.

민간 무인항공기의 국가 공역 운용 위한 기술표준 동향

유창선(Yoo, Chang-sun) 한국항공우주연구원 2021 항공우주산업기술동향 Vol.19 No.2

오늘날 무인항공기의 기술발전은 항공, 정보통신, 컴퓨터, 소재 등 산업 전반에 걸쳐 발전과 성장을 주도하고 있으며 기존의 상업용 항공기가 운용되는 민간공역에서도 제한적인 운용이 이루어지고 있다. 앞으로 무인항공기가 국가 공역 진입이 빈번해질 것으로 예상되는 바 국제민간 항공기구를 중심으로 무인항공기와 유인항공기의 국가공역 통합운용에 대한 논의가 진행되어 국제 표준화 기구 및 단체를 중심으로 기존의 기술표준에 대한 검토와 새로운 기술표준에 대한 표준화 작업이 이루어져 왔다. 이를 기반으로 국제민간항공기구에서는 각국에서 항공정책에 반영토록 권고하고 각국에서는 법, 제도, 기준을 마련하고, 인프라 구축 및 기술 개발을 진행하고 있다. 여기서는 이러한 국제적으로 진행되고 있는 민간무인항공기의 국가 공역 운영을 위한 기술표준 동향을 파악하고 이와 관련된 국내‧외 연구개발 현황을 알아보았다. Today Unmanned Aircraft System(UAS) has lead the growth in industry and market of aeronautics, information and intelligence, computer, materials and others, of which operation in national airspace for commercial aircraft has been allowed under the experimental airspace with restricted or special conditions. In the future, as UAS is expected to fly frequently in national airspace, ICAO has addressed the discussion for national airspace operation of UAS and the standardization for related technologies through activities of working group under standardization organizations. ICAO has adopted the annex and the standards and recommendation practices, which has been recommended to all nations. This paper represents the standardization and research trends for operation in national airspace of civil unmanned aircraft system.