• 제목/요약/키워드: aircraft measurement

검색결과 253건 처리시간 0.024초

항공기의 소독작업 및 좌석커버 교체작업에서 1-브로모프로판 노출평가 사례 (Case Study of 1-bromopropane Exposure Assessment During Aircraft Disinfection and Seat Cover Replacement Work)

  • 박해동;노지원;장미연;김성호;김세동;조현민
    • 한국산업보건학회지
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    • 제34권1호
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    • pp.8-13
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    • 2024
  • Objectives: To evaluate the levels of exposure to organic compounds during aircraft disinfection and seat cover replacement operations. Methods: According to the working schedule, organic compounds were collected using activated carbon tubes and then analyzed by GC/FID and GC/MSD. Results: In the disinfection task, the main substances listed in the material safety data sheet (MSDS) of the disinfectant were not detected. However, 1-bromopropane, which had been used in the previous task of replacing seat covers, was detected at a level of 2.37 ppm at the measurement time. During seat cover replacement, bonding workers were exposed to 2.48 ppm on an eight-hour time-weighted average, and seat cover replacement workers were exposed to 0.22 ppm. Conclusions: It is necessary to ensure the reliability of MSDS. A work environment management system is necessary when different companies alternate working in the same place.

Electro-Micromechanical Technique을 이용한 각의 변화에 따른 Carbon과 SiC Fiber/Epoxy Composites의 계면감지능 및 평가 (Interfacial Sensing and Evaluation of Carbon and SiC Fibers/Epoxy Composites with Different Embedding Angle using Electro-Micromechanical Technique)

  • Lee, Sang-Il;Kong, Jin-Woo;Park, Joung-Man
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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    • pp.199-202
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    • 2002
  • Interfacial properties and electrical sensing for fiber fracture in carbon and SiC fibers/epoxy composites were investigated by the electrical resistance measurement and fragmentation test. As fiber-embedded angle increased, interfacial shear strength (IFSS) of two-type fiber composites decreased, and the elapsed time was long to the infinity in electrical resistivity. The initial slope of electrical resistivity increased rapidly to the infinity at higher angle, whereas electrical resistivity increased gradually at small angle. Furthermore, both fiber composites with small embedded angle showed a fully-developed stress whitening pattern, whereas both composites with higher embedded angle exhibited a less developed stress whitening pattern. As embedded angle decreased, the gap between the fragments increased and the debonded length was wider for both fiber composites. Electro-micromechanical technique can be a feasible nondestructive evaluation to measure interfacial sensing properties depending on the fiber-embedded angle in conductive fiber reinforced composites.

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KASS 탑재측정장비 요구사항 및 설계방안 분석 (Analysis of the Requirements and Design of KASS Measuring Equipment)

  • 김우리얼;홍교영;강희원;최광식
    • 한국항행학회논문지
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    • 제21권6호
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    • pp.544-548
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    • 2017
  • 국제민간항공기구에서는 전 세계적으로 PBN 이행 촉구를 위해 2025년까지 모든 항공기의 SBAS 사용을 권고하고 있는 상황이다. 이에 국내에서도 한국형 SBAS인 KASS 개발이 진행 중에 있다. ICAO에서는 SBAS에 대한 인증 및 운용에 있어서 해당 항공 당국에 그 권한을 부여하고 있으며, KASS 또한 시스템 상세 설계, 제작, 설치 가 수행된 후 시스템에 대한 검증이 이루어 질 예정이다. 이에 본 논문에서는 국제 표준의 비행검사 규정을 통해 비행시험 파라미터를 도출 하였으며 이를 측정하기 위한 탑재측정장비의 구성방안에 대해서 제안 하였다.

관성측정기를 이용한 항공기용 위성추적 안테나의 지향각 결정 (LOS Determination Using INS for an Aircraft Mounted Satellite Tracking Antenna)

  • 정하형;김충일;유준
    • 전자공학회논문지SC
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    • 제49권3호
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    • pp.12-18
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    • 2012
  • 본 논문에서는 항공기에 장착된 안테나가 정지 위성을 향하도록 관성측정기를 사용하여 지향각을 계산하는 방식을 제시한다. 대상 시스템에서 안테나는 항공기 앞에 위치하고 있고 몸체 유연성을 고려하기 위해 관성측정기를 도입하며, 항공기 중심부 GPS/INS와 안테나부 관성항법장치(INS) 사이의 위치와 속도 차이를 활용하여 스트랩다운 INS 표류 오차를 억제하기 위한 칼만필터를 설계한다.

무인 비행체용 저가의 ADGPS/INS 통합 항법 시스템 (Design of a Low-Cost Attitude Determination GPS/INS Integrated Navigation System for a UAV (Unmanned Aerial Vehicle))

  • 오상헌;이상정;박찬식;황동환
    • 제어로봇시스템학회논문지
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    • 제11권7호
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    • pp.633-643
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    • 2005
  • An unmanned aerial vehicle (UAV) is an aircraft controlled by .emote commands from ground station and/o. pre-programmed onboard autopilot system. A navigation system in the UAV provides a navigation data for a flight control computer(FCC). The FCC requires accurate and reliable position, velocity and attitude information for guidance and control. This paper proposes an ADGPS/INS integrated navigation system for a UAV. The proposed navigation system comprises an attitude determination GPS (ADGPS) receive., a navigation computer unit, and a low-cost commercial MEMS inertial measurement unit(IMU). The navigation algorithm contains a fault detection and isolation (FDI) function fur integrity. In order to evaluate the performance of the proposed navigation system, two flight tests were preformed using a small aircraft. The first flight test was carried out to confirm fundamental operation of the proposed navigation system and to check the effectiveness of the FDI algorithm. In the second flight test, the navigation performance and the benefit of the GPS attitude information were checked in a high dynamic environment. The flight test results show that the proposed ADGPS/INS integrated navigation system gives a reliable performance even when anomalous GPS data is provided and better navigation performance than a conventional GPS/INS integration unit.

항공기용 내장형 온-글래스 안테나 설계 (Design of Aircraft Internal On-glass Antennas)

  • 강우준;추호성;김영기;강호원
    • 대한전자공학회논문지TC
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    • 제46권12호
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    • pp.65-71
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    • 2009
  • 본 논문에서는 FM 라디오 송수신을 위한 항공기용 글래스 안테나를 제안하였다. 제안된 안테나는 광대역 주파수 특성을 얻기 위해 다중 루프 구조를 채택하였으며 탑승자의 시야확보를 극대화하기 위해 창틀 구조를 모사한 안테나 형상을 선택하였다. 세부적인 설계 변수는 Pareto 유전자 알고리즘을 이용하여 최적화하였으며 설계된 글래스 안테나를 실제 한국형 기동헬기 조종석 측면 유리에 인쇄한 후 성능을 측정하였다. 측정결과 FM 주파수 대역에서 63.3%의 반전력 대역폭과, 전면방향(bore-sight direction)에서 평균 -12.98 dBi의 수직편파 복사이득을 보였다.

The AS4059 Hydraulic System Cleanliness Classification System: Replacement of NAS1638

  • 마이크 데이;홍정희
    • 드라이브 ㆍ 컨트롤
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    • 제9권2호
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    • pp.39-45
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    • 2012
  • The NAS 1638 cleanliness classification system was originally developed in 1966 by the US Aircraft Industries of America to both simplify reporting of particle count data and to control the introduction of dirt during the assembly of aircraft fluid systems. The numbers of particles at stated sizes are represented by broad bands where the interval was generally a doubling of contamination. A number of systems have been introduced since this to suit differing requirements. NAS 1638 and AS4059 are used in other industrial sectors such as the Off-shore & Sub-Sea and the Primary Metal Industries. The changes to ISO contamination measurement standards controlled by ISO/TC131/SC6 in 1999 meant that a revision of most of these classification systems was necessary. The body responsible for NAS 1638 decided to withdraw it for new installations and replace it with an update of an existing standard, SAE AS 4059. This paper details the philosophy behind the contamination coding systems, the reasons for the changes to the ISO contamination standards and explains the workings of AS 4059, the replacement for NAS 1638. It goes on to detail the latest changes to this standard.

Design of Multisensor Navigation System for Autonomous Precision Approach and Landing

  • Soon, Ben K.H.;Scheding, Steve;Lee, Hyung-Keun;Lee, Hung-Kyu
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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    • pp.377-382
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    • 2006
  • Precision approach and landing of aircraft in a remote landing zone autonomously present several challenges. Firstly, the exact location, orientation and elevation of the landing zone are not always known; secondly, the accuracy of the navigation solution is not always sufficient for this type of precision maneuver if there is no DGPS availability within close proximity. This paper explores an alternative approach for estimating the navigation parameters of the aircraft to the landing area using only time-differenced GPS carrier phase measurement and range measurements from a vision system. Distinct ground landmarks are marked before the landing zone. The positions of these landmarks are extracted from the vision system then the ranges relative to these locations are used as measurements for the extended Kalman filter (EKF) in addition to the precise time-differenced GPS carrier phase measurements. The performance of this navigation algorithm is demonstrated using simulation.

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한국인의 교통소음에 대한 불쾌감 연구 (Community Annoyance from Transportation Noise in Korea)

  • 이수갑;임창우;김재환;홍지영
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2005년도 추계학술대회논문집
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    • pp.33-42
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    • 2005
  • Studies on community annoyance caused by transportation noise exposure were carried out in fifty-one areas around Gimpo and Gimhae international airports, Gyungbu and Honam railway lines and east and riverside-northen motorway to accumulate social survey data and to assess the relationship between each transportation noise level and degree of annoyance in Korea. The measurements of transpotation noise were carried out using portable precision sound level meters (B&K type 2238 and LD 812) except in aircraft noise. Aircraft noise levels were measured automatically by airport noise monitoring system, B&K type 35n Social surveys were carried out to people living around noise measurement points. Questionnaires were only aggregated by face-to-face interviews using various questions concerned with demographic factors, degree of noise annoyance, interference with daily activities and health-related symptoms. The questions of noise annoyance were answered on an 11-point numerical scale. The respondents, from 18 to 70 years of age, were randomly selected and completed the questionnaire for themselves. The total number of respondents for the questionnaires was 1,839. The results showed that community annoyance of railway noise in Korea is similar to that in Japan, but is more severe than that in European countries.

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국내선 항공기 연료소모량 분석을 통한 연료절감 방안연구 - B737 항공기 연료소모량을 중심으로 - (A Study on the Fuel Saving Method through the Analysis of Fuel Consumption on Domestic Flight - Based on the Fuel Consumption of B737 Aircraft -)

  • 최지헌;이경한;김용옥;김웅이
    • 한국항공운항학회지
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    • 제30권2호
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    • pp.24-33
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    • 2022
  • This study analyzed and derived a plan to reduce fuel consumption of domestic aircraft. Specifically, this study tested fuel consumption in the short-distance flights of B737. Fuel consumption was calculated by substituting the simulation variable values into Matlab. The strength of this study is that the actual operating environment was reflected by collecting the B737 flight data. As a result of the study, the domestic fuel consumption rate in the computed flight plan was less than the current fuel consumption rate. Existing limitations of this study is that it was difficult to reflect the various variables constituting the flight environment, and thus there can be errors in the measurement of the fuel consumption. There are two major expected applications from this study. First, applying the plans from this study will lead to a reduction in the amount of fuel and thus provide positive economic effects for commercial airlines. Second, the plan from this study will provide a basis for pilots to predict fuel consumption more accurately. In conclusion, this study proposes a fuel saving plan with useful applications for pilots and airlines.