• Title/Summary/Keyword: General aviation

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Organization and Qualification Documents for Generation of Composite Materials Property (복합재 물성치 생성을 위한 조직체계 및 인증문서)

  • Rhee, Seung Yun;Suh, Jang Won
    • Journal of Aerospace System Engineering
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    • v.7 no.4
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    • pp.55-61
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    • 2013
  • In recent years, NASA, FAA and the aerospace industry, through MIL-HDBK-17 and the NASA-conceived AGATE(Advanced General Aviation Transport Experiments) program, have worked together to reduce the qualification burden imposed on individual aircraft manufacturers. AGATE is one of the most successful public/private cost-haring partnerships ever conceived, bringing together academia, the FAA, other government agencies and industry to develop affordable new technologies and accompanying industry standards and certification methods. In 2005, NASA established NCAMP(National Center for Advanced Materials Performance) with the purpose of refining and enhancing the AGATE process to a self-sustaining level to serve the entire aerospace industry in partnership with CMH-17, FAA, and SAE. In this paper, I will introduce briefly NCAMP process and explain its organization structure and core NCAMP documents. This paper can provide some help in establishing our certification system for composite materials where the NCAMP process is expected to be the most good model.

단일 안테나 GPS수신기 기반 무인항공기의 자동 이착륙

  • Lee, Sang-Hyo;Jo, Am;Kim, Ji-Hun;Gi, Chang-Don
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.471-474
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    • 2006
  • GPS수신기는 항법센서로서 여러 분야에서 널리 사용되고 있다. 단일 안테나 GPS수신기로부터 일반적으로 위치와 속도 및 시간 정보를 얻을 수 있다. 그러나 고정익 항공기의 운동 특성을 고려하여 단일 안테나 GPS수신기의 측정치로부터 무인항공기의 자세를 추정할 수 있다. 이로써 단일안테나 GPS수신기를 이용하여 무인항공기의 자동 제어가 가능함을 이전 논문에서 보인 바 있다. 본 논문에서는 단일 안테나 GPS수신기를 무인항공기의 기본 센서로 사용하여 자동 이착륙이 가능함을 비행실험을 통해 보인다. 무인항공기의 반응속도와 강건성을 향상시키기 위해 rate gyros의 각속도 측정치를 이용한다. 또한 활주로에 자동착륙하기 위해서는 높은 정확도의 위치 정보가 필요하므로 DGPS를 이용하였다. 비행 실험 동안 무인항공기는 이륙에서 착륙까지 모든 과정을 자동 제어로 수행한다. 대부분 비행은 경로 제어로 이루어진다. 비행 실험 결과를 바탕으로 단일안테나 GPS수신기가 General Aviation 항공기나 무인항공기의 백업이나 저가의 제어 시스템을 위한 주 센서로서 사용이 가능할 것으로 판단된다.

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A Programming System for SCARA-Type Robots (SCARA형 로봇트를 위한 프로그래밍 시스템)

  • Kim, S.K.;Shin, Y.S.;Lim, J.;Bien, Z.
    • Proceedings of the KIEE Conference
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    • 1987.07a
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    • pp.275-278
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    • 1987
  • In this paper, a programming system for SCARA-type robots is designed, consisting of robot language, computational facilities and programming tools for handling interconnection environments. In designing the robot language, CLRC(C Library for Robot Control) is introduced, using the general-purpose language 'C' as base programming language. Also the motion primitives for Continuous Path control as well as Point-To-Point motion arc included. By means of frame and homogeneous transformations the system is capable of applying the SCARA-type robot efficiently and easily for any given task.

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Test Witness Methodology for Acquisition of the Composite Material Qualification Data (복합재 재료인증을 위한 시험입회 방법론)

  • Rhee, Seung Yun
    • Journal of Aerospace System Engineering
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    • v.9 no.3
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    • pp.8-11
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    • 2015
  • Since the late 1990's, FAA, NASA and the aerospace industry have worked together to develop the sharing system of the composite material qualification databases which were obtained through the standardized fabrication and testing procedures. The result was what is now known as the AGATE(Advanced General Aviation Transport Experiments) or NCAMP(National Center for Advanced Materials Performance) methodology, a more cost-effective concept that shifts the major responsibility for qualification and testing from the aircraft manufacturer to the material supplier. The properties of composite materials are largely dependent on the testing as well as the raw material properties and the manufacturing process including the process control parameters. Thus it is important in the composite material qualification to comply with the standardized testing procedures. In this paper, I will describe the standardized witness methodologies of certification engineers to reduce the effect of testing variability within the qualification data.

THE SOC ESTIMATION OF THE LEAD-ACID BATTERY USING KALMAN FILTER

  • JEON, YONGHO
    • Journal of applied mathematics & informatics
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    • v.39 no.5_6
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    • pp.851-858
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    • 2021
  • In general, secondary batteries are widely used as an electric energy source. Among them, the state of energy storage of mobile devices is very important information. As a method of estimating a state, there is a method of estimating the state by integrating the current according to an energy storage state of a battery, and a method of designing a state estimator by measuring a voltage and estimating a charge amount based on a battery model. In this study, we designed the state estimator using an extended Kalman filter to increase the precision of the state estimation of the charge amount by including the error of the system model and having the robustness to the noise.

Full composites hydrogen fuel cells unmanned aerial vehicle with telescopic boom

  • Carrera, E.;Verrastro, M.;Boretti, Alberto
    • Advances in aircraft and spacecraft science
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    • v.9 no.1
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    • pp.17-37
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    • 2022
  • This paper discusses an improved unmanned aerial vehicle, UAV, configuration characterized by telescopic booms to optimize the flight mechanics and fuel consumption of the aircraft at various loading/flight conditions.The starting point consists of a full-composite smaller UAV which was derived by a general aviation ultralight motorized aircraft ULM. The present design, named ToBoFlex, extends the two-booms configuration to a three tons aircraft. To adapt the design to needs relevant to different applications, new solutions were proposed in aerodynamic fields and materials and structural areas. Different structural solutions were reported. To optimize aircraft endurance, the innovative concept of Telescopic Tail Boom was considered along with two different tails architecture. A new structural configuration of the fuselage was proposed. Further consideration of hydrogen fuel cell electric propulsion is now being studied in collaboration between the Polytechnic of Turin and Prince Mohammad Bin Fahd University which could be the starting point of future investigations.

Increasing the Effectiveness of Educational Historical and Cultural Video Content on YouTube with the Help of Built-in Analytical Tools

  • Bratus, Ivan;Boiko, Vita;Zaharchuk, Oleh;Zaitseva, Veronika;Gunka, Anna;Sachok, Viktor
    • International Journal of Computer Science & Network Security
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    • v.22 no.11
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    • pp.137-140
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    • 2022
  • The article deals with increasing the effectiveness of educational content on the YouTube channel with the help of built-in analytics tools. Particular attention is paid to the creation of quality video, taking into account the reaction of end users of video materials. Ways to increase the video audience are considered. Techniques for improving video content apply to individual videos, as well as playlists and channels in general. In this case YouTube is both an independent educational platform and an auxiliary platform in a set of various educational solutions.

FABER POLYNOMIAL COEFFICIENT ESTIMATES FOR ANALYTIC BI-UNIVALENT FUNCTIONS ASSOCIATED WITH GREGORY COEFFICIENTS

  • Serap Bulut
    • Korean Journal of Mathematics
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    • v.32 no.2
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    • pp.285-295
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    • 2024
  • In this work, we consider the function $${\Psi}(z)=\frac{z}{\ln(1+z)}=1+\sum\limits_{n=1}^{\infty}\,G_nz^n$$ whose coefficients Gn are the Gregory coefficients related to Stirling numbers of the first kind and introduce a new subclass ${\mathcal{G}}^{{\lambda},{\mu}}_{\Sigma}(\Psi)$ of analytic bi-univalent functions subordinate to the function Ψ. For functions belong to this class, we investigate the estimates for the general Taylor-Maclaurin coefficients by using the Faber polynomial expansions. In certain cases, our estimates improve some of those existing coefficient bounds.

Position Control of Dual Redundant Asymmetric Tandem Electro-Hydrostatic Actuator for Aircraft based on Backstepping Technique (백스테핑 기법을 이용한 항공기용 이중화 비대칭형 직렬 전기-정유압 구동기의 위치제어)

  • Kim, Daeyeon;Park, Hyung Jun;Kim, Sang Seok;Kim, Dae Hyun;Kim, Sang Beom;Lee, Junwon;Choi, Jong Yoon
    • Journal of Aerospace System Engineering
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    • v.15 no.3
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    • pp.1-10
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    • 2021
  • The electro-hydrostatic actuators (EHA) are widely used in various industrial fields since they can independently execute the function of the hydraulic power source and have high efficiency. Particularly, in the aviation field, the EHA is mainly designed as dual redundant asymmetric tandem actuator to mitigate failure and minimize installation space. However, aviation EHAs designed in the form of dual redundant asymmetric tandem actuator have the disadvantage of decreased durability performance due to the occurrence of force fighting. In this paper, the controller is designed based on backstepping technique to improve control performance and reduce force fighting for aviation EHA. The augmented state observer is proposed to estimate the states required for control. Through simulation, it was verified that the proposed controller had superior control performance and significantly reduces the force fighting compared to the general PI controller.

Exposure Assessment of Dust, Ultra Fine Dust(Particulate Matter 2.5, PM2.5) and Black Carbon among Aircraft Cabin Cleaners (항공기 기내 청소노동자의 분진, 초미세먼지(PM2.5) 및 블랙카본 노출수준 평가)

  • Hyunhee Park;Sedong Kim;Sungho Kim;Seung-Hyun Park
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.33 no.2
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    • pp.171-187
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    • 2023
  • Objectives: Aircraft cabin cleaning work is characterized by being performed within a limited time in a narrow and enclosed space. The objective of this study was to evaluate the exposure levels to dust, ultra fine dust(PM2.5) and black carbon(BC) among aircraft cabin cleaners. Methods: Active personal air sampling for respirable dust(n=73) and BC(n=47) was conducted during quick transit cleaning(cabin general and vacuum-specific) and seat cover replacement and total dust and PM2.5 were area-air-sampled as well. Also, size distribution of particle was identified with the cleaning workers targeted. Dusts were collected with PVC filters using gravimetric analysis. The concentration of PM2.5 and the particle size distribution were measured with real-time direct reading portable equipment using light scattering analysis. The concentration of BC was measured by aethalometer(filter-based real-time light absorption analysis instrument). Results: The geometric mean of respirable dust was the highest at vacuum cleaning as 74.4 ㎍/m3, following by replacing seat covers as 49.3 ㎍/m3 and cabin general cleaning as 47.8 ㎍/m3 . The arithmetic mean of PM2.5 was 4.83 ~ 9.89 ㎍/m3 inside the cabin, and 28.5~44.5 ㎍/m3 outside the cabin(from bus and outdoor waiting space). From size distribution, PM2.5/PM10 ratio was 0.54 at quick transit cleaning and 0.41 at replacing seat covers. The average concentration of BC was 2~7 ㎍/m3, showing a high correlation with the PM2.5 concentration. Conclusions: The hazards concentration levels of aircraft cabin cleaners were very similar to those of roadside outdoor workers. As the main source of pollution is estimated to be diesel vehicles operating at airports, and it is necessary to replace older vehicles, strengthen pollutant emission control regulations, and introduce electric vehicles. In addition, it is necessary to provide as part of airport-inftastructure a stable standby waiting space for aircraft cabin cleaners and introduce a systematic safety and health management system for all workers in the aviation industry.