• Title/Summary/Keyword: 트림분석

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A study on the control law of Automatic Rudder Trim System for turbo prop aircraft (터보 프롭 항공기 자동러더트림장치 제어법칙에 관한 연구)

  • 박완기;이광현;김병수
    • Journal of the Korea Institute of Military Science and Technology
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    • v.2 no.1
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    • pp.121-131
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    • 1999
  • Automatic Rudder Trim System(ARTS) is a device to reduce the pilot's work load for rudder trimming greatly required in varying abruptly aircraft's engine power. This paper represents a technical analysis and a design of control law of the ARTS. The control law of the ARTS is designed based on the analysis of aircraft's characteristics, system's requirements, and limitations. The control law is comprised of open loop control using the rudder trim map for a specific aircraft and closed loop control to compensate the error of the open loop control system. flight test results show that the ARTS can reduce pilot's work load for rudder trimming dramatically and can compensate the aircraft's transient yaw motion.

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Effect of Leisure Support and Leisure Constraints on Life Satisfaction of Extreme Sports Participants (익스트림 스포츠 참여자의 여가지지가 여가제약과 생활만족에 미치는 영향)

  • Ahn, Byoung-Wook
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.9 no.2
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    • pp.737-744
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    • 2019
  • The study aimed to effect of leisure support and leisure constraints on life satisfaction for extreme sports participants. A total of 368 adults from Seoul, In-chon, Gyeonggi, and Chungcheng-do were recruited. I conducted frequency, reliability, confirmatory factor, correction, and structure equaling modeling analyses using PASW Statistics 18.0 and AMOS 18.0. The results were as follows: (1) leisure support of extreme sport participants has no influence on leisure constraints; (2) leisure support of extreme sport participants had no influence on life satisfaction; (3) leisure constrain of extreme sports had a positive influence on life satisfaction. The article revealed which sport activity as like leisure activity had influence on life satisfaction, and leisure support of participants were related with life satisfaction. Therefore, we continue need to induce to join a extreme sport as it publicize a good benefits for extreme sport.

Evaluation of volatile organic compounds emitted from door-trim armrest using micro chamber and 20 L static chamber (마이크로 챔버와 20 L static chamber를 이용한 도어트림 암레스트로부터 방출되는 휘발성 유기화합물 평가)

  • Lee, Ik-Hee;Yoo, Ji-Ho;Kim, Man-Goo
    • Analytical Science and Technology
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    • v.24 no.4
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    • pp.290-297
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    • 2011
  • In present, evaluation method for car cabin air quality has been developed in ISO, China, Japan. Also The management standard for new produced car has been applied since 1, July, 2010. To manage car cabin air quality, It is important to evaluate VOC emitted from interior material. In this study, complete component of door trim armrest was evaluated in accordance with ISO 12219-5, cut component was evaluated in accordance with ISO 12219-3. The vapour gas was collected with stainless tube packed with Tenax TA and analyzed with TD-GC/MS. It was confirmed that emission rate of each compounds was difficult in each evaluation method. As a result, to evaluating each components composing door trim armrest, main sources of emitting VOCs in door trim armrest were PP substrate and adhesive.

A Study on the Hydrodynamic Performance of High-Speed Vessel with Trim Tab Using Full-Scale CFD Simulation (실선 스케일 CFD 해석 기반 트림 탭이 부착된 고속선의 유체동역학적 성능 분석)

  • Lee, Jonghyeon;Park, Dong-Woo
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.5
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    • pp.656-665
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    • 2021
  • In this study, trim tabs were attached to end of stern hull of a small high-speed vessel of length approximately 10 m and Froude number 1.0 to improve resistance performance and passenger comfort. Before computational fluid dynamics (CFD) simulations to assess the performance according to various geometries of the trim tab, the scale effect had been found through a previous study, so full-scale simulations were performed. The trim tab chord length was set to 0.5 %, 1.0 % and 1.5 % of LPP, and its angle to base line was varied in intervals of 5°. It decreased trim by stern and flotation: the greater the angle and length, the greater was the effect. Then it had pressure resistance decreased and shear resistance increased, and reduction ratio of total resistance varied accordingly. The results of this study indicated that the resistance performance was improved about 27 % at optimal running attitude that was the trim by stern about 1.5°.

Development of Mission Analysis Tool for eVTOL Aircrafts of Lift-Tilt Concept (Lift-Tilt 개념의 eVTOL 항공기 임무 분석 도구 개발)

  • Paek, Seung-Kil;Chae, Sanghyun;Kang, Hee Jung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.10
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    • pp.859-870
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    • 2021
  • KARI (Korea Aerospace Research Institute) is developing a design framework for the concept and preliminary design of eVTOL aircrafts. A low fidelity mission analysis tool was developed for the eVTOL aircrafts of Lift-Tilt Concept, which have tilt propellers and lift propellers, using open source SUAVE package. For its development, a review for the propeller performance analysis functionality was made. To find the trim solution at each mission segment automatically, an algorithm is implemented, using a global optimization technique through parallel processings and DOE(design of experiment). Using the tool, the one seated eVTOL OPPAV(optionally piloted personal air vehicle) was modeled and evaluated, which results were compared with the preliminary design data.

A Study on Longitudinal Flight Dynamics of a QTW UAV (QTW 무인항공기의 종축 비행동역학에 관한 연구)

  • Jung, Ji In;Hong, Sung Tae;Kim, Seungkeun;Suk, Jinyoung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.1
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    • pp.31-39
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    • 2013
  • A Quad Tilt Wing UAV is a new concept hybrid UAV having the advantages of both fixed-wing and rotary-wing aircraft. This paper presents longitudinal flight dynamic characteristics of a Quad Tilt Wing UAV. The designed Quad Tilt Wing UAV is a configuration of a tandem wing type aircraft with an actuating motor and propeller mounted at each wing. Momentum theory is used to calculate the thrust, and nonlinear modeling is performed considering lift and drag generated by slip stream effect of propellers. Also, Force and moment variation at each tilting angle is considered. Static trim on longitudinal axis is analyzed via numerical simulation. Componentwise force contribution was analyzed at each trim mode. Dynamic characteristics were evaluated through eigenvalue analysis for a linear model at each flight mode. It is verified that longitudinal dynamic characteristics are changing from unstable to stable state by continuous transition of dominant poles.

The Correlation between Participating in the Extreme Sports, and the Flow Experience and the Satisfaction of Life (익스트림 스포츠 참가의 몰입경험 및 생활만족의 관계)

  • Hwang, Yu-Rhee;Seok, Kang-Hoon;Lee, Jae-Hyung
    • Journal of Navigation and Port Research
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    • v.38 no.2
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    • pp.147-154
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    • 2014
  • The purpose of this study was to identify the correlation among participating in the extreme sports, the flow experience and the satisfaction of life. 420 participants of the extreme sports were selected by the Judgement Sampling Method. Factor analysis and multi-regression analysis have been conducted. The conclusion is as follows. First, the participants' life satisfaction is partially affected by the duration period and term. Second, period, frequency, duration partially effect to life satisfaction. Third, flow experience partially effect to life satisfaction.

Numerical Simulation for Improvement in Resistance Performance by Bulb Retrofit under Optimal Trim Conditions (최적 트림 조건하에서 벌브개조를 통한 선박저항성능 개선 연구)

  • Park, Hyunsuk;Seo, Dae-Won
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.28 no.6
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    • pp.1070-1077
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    • 2022
  • The International Maritime Organization has recently strengthened its marine environment regulations. The energy efficiency index has long been an important indicator of ship design, and now, energy efficiency is being enforced for existing ships as well as new ships. To increase the energy efficiency of existing ships, methods such as retrofitting the bow bulb, selecting an optimized trim during ship operation, and installing an energy saving device have been applied. In this study, the ship resistance was numerically simulated using computational fluid dynamics (CFD) under various bow and stern trim conditions. In addition, the bulb was redesigned to further improve the resistance performance under the selected trim conditions. When the improved bulb was applied, the effective horse power increased by approximately 5%. It is, however, necessary to verify whether the redesigned bulb can reduce ship resistance in waves.

A Study on the accuracy of speed measuring system by the Doppler effect -The error of speed single beam Doppler log over the ground by various trim- (Doppler 효과(效果)에 의한 속도계측장치(速力計測裝置)의 정도(精度)에 관(關)한 연구(硏究) -Single beam Doppler log의 트림 변화에 따른 대지속력(對地速力) 오차(誤差)-)

  • Kim, Koang-Hong
    • Journal of Fisheries and Marine Sciences Education
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    • v.9 no.2
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    • pp.179-187
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    • 1997
  • Doppler log and current meter are based on the measurment of the doppler effect. Ship's speed over the ground measured by means of doppler log effect of underwater ultrasonic intends to get infulence by the difference of sound velocity, the ship's course, the sea bottom inclination, the trim and tranducer installation etc. This paper investigated on the error of speed over the ground by change of the trim comparing the real speed obtained by the mile post with the speed of single beam type doppler log on the trainning ship Kyeongyangho. The results are as follows ; 1. Indicating speed of doppler log is very much greatly influenced on variation of trim, but the real speed is less affected variation by trim. 2. The range of variation and error of speed over ground are smallest when ship's trim is 2.15m trim by the stern.

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Impact Analysis of True View Ad Typees : Focusing on YouTube In-Stream Ads (TrueView 광고 유형에 따른 노출 효과 분석 : YouTube 인스트림광고 중심으로)

  • Kim, Tae Soon;Noh, Hwang Woo
    • Proceedings of the Korea Contents Association Conference
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    • 2018.05a
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    • pp.179-180
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    • 2018
  • 최근 N스크린 세대의 새로운 소비 주도층인 밀레니얼세대(10대~20대 초반)의 증가로 모바일 YouTube 동영상 시청자가 증가하였다. 이로 인해 광고 노출 가능성이 높아지고 있어 YouTube 인스트림 광고가 광고주들의 높은 주목을 받고 있다. 그러나 현재 광고 게재에 따른 정확한 노출 효과에 대한 연구 분석 자료는 현저히 부족하다. 이에 모바일 YouTube 동영상 시청자 수가 가장 높은 10대~20대 초반을 대상으로 국내 YouTube 인스트림 광고 사례 10개를 선정하여 선택적 시청에 따른 시청자들의 행태 파악과 광고 몰입도를 분석해 보았다. 분석 결과 소구 유형별 광고 몰입도는 이성소구보다 감성소구가 컸으며, 그 중 유머소구의 광고 몰입도가 가장 크게 나타났다. 본 연구 결과가 향후 광고 노출 효과를 높이는데 도움이 되기를 기대한다.

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