• Title, Summary, Keyword: Airfield

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Noise Evaluation of Turbo Fan Aircraft(C525) in the Airfield (비행장에서의 터보 팬 항공기(C525) 소음 평가)

  • Kim, Woo-Jin;Ryu, Jong-Hyeon
    • Journal of the Korean Society of Mechanical Technology
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    • v.20 no.5
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    • pp.691-696
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    • 2018
  • Noise is unwanted sound and nerve jarring sound or mentally and physically harmful sound to the human body. In the 20th century, the aviation industry have been comprehensive industry of all areas and humanity have been globalized, the number of aircraft operated have been increased continuously. We confirmed that the actual measured noise data was consistent with the aircraft average noise data to calculate noise maps of INM version 7.0. and based on this, the actual flight scenarios and the noise map were created. For making the noise map, we assumed that the maximum number of flight is operated.

Evaluation on the Noise Influence and Reduction due to the Change of Military Aircraft Flight Path (군용항공기의 운항 경로 변경에 따른 소음영향 및 저감 평가)

  • Lee, Jin-Young;Lee, Chan;Kil, Hyun-Gwon
    • Journal of Environmental Impact Assessment
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    • v.18 no.3
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    • pp.143-150
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    • 2009
  • The present study investigates the effects of the flight paths of military aircraft on noise map and its WECPNL(Weighted Equivalent Continuous Perceived Noise Level) distribution. Aircraft noise modeling and simulation have been performed on a Korean military air base by means of INM(Integrated Noise Model) with the input data of airfield location, aircraft specifications, flight paths and aircraft's operation schedules. The result of noise modelling has been verified in comparison with the result of measured noise level. The flight path of military aircraft, as the key parameter of the present study, was modeled by combining takeoff, overfly, approach and touch-and-go modes. The present INM simulations have been conducted for various flight path cases with different takeoff, approach modes and overfly modes. The simulation results showed that the change of flight path can remarkably affect the noise influence region and the WECPNL distribution around the airfield.

Analysis of ADS-B ground trajectory data using non-aviation approval public data (공공용 정보를 이용한 ADS-B 지상 항적 자료 분석)

  • Ku, SungKwan;Baik, Hojong
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.23 no.4
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    • pp.6-11
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    • 2015
  • In this study, we surveyed analysis of ADS-B ground trajectory data using non-aviation approval public data. For analysis used non-aviation public data and commercial ADS-B receiver. The study result is available using ADS-B ground trajectory data for airfield surveillance on limited range. Also, to confirmed of available using non-aviation public data for aviation research.

Flying Safety Area Model Creation and Obstruction Identification using 3D GIS Techniques (3차원 GIS 기법을 이용한 비행안전구역 모형 생성 및 장애 식별)

  • Park, Wan Yong;Heo, Joon;Sohn, Hong Gyoo;Lee, Yong Woong
    • Journal of The Korean Society of Civil Engineers
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    • v.26 no.3D
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    • pp.511-517
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    • 2006
  • In this paper, we studied the techniques to analyze the flying safety area focused on the air base rules for military that has been the criteria of the altitude restrictions around the airfield for both civilian and military purposes in Korea. We wanted to present the effective method to analyze the restricted area and to help solving problems that could result recently from the altitude restrictions around the airfield at the beginning of the development projects. To do this we proposed the methods to effectively generate the model of the flying safety area in accordance with the air base rules using 3D GIS techniques and to automatically identify the obstructions caused by the natural and man-made features in those areas. To apply the proposed methods actually to the airfield chosen for the study area, we presented the approaches to generate geospatial informations based on the commercial digital maps and satellite imagery and by generating the flying safety area model, identifying the obstructions, and visualizing the integrated model for the flying safety area analysis we showed the practical usability of the proposed techniques.

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The research on static and dynamic mechanical properties of concrete under the environment of sulfate ion and chlorine ion

  • Nie, Liangxue;Xu, Jinyu;Bai, Erlei
    • Computers and Concrete
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    • v.20 no.2
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    • pp.205-214
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    • 2017
  • The Hydraulically driven test system and ${\Phi}100mm$ split Hopkinson pressure bar(SHPB) test device were employed to research the quasi-static and dynamic mechanical properties of concrete specimens which has been immersed for 60 days in sodium sulfate (group S1) and sodium chloride (group S2) solution, the evolution of their mass during corrosive period was explored at the same time, and the mechanism of performances lost was analyzed from the microscopic level by using scanning electron microscope. Results of the experimental indicated that: their law of mass both presents the trend of continuous rising during corrosive period, and it increases rapidly on the early days, the mass growth of group S1 and group S2 in first 7 days are 76.78% and 82.82% of their total increment respectively; during the corrosive period, the quasi-static compressive strength of specimens in two groups are significantly decreased, both of which present the trend of increase first and then decrease, the maximum growth rate of group S1 and group S2 are 7.52% and 12.71% respectively, but they are only 76.23% and 82.84% of specimens which under normal environment (group N) on day 60; after immersed for 60 days, there were different decrease to dynamic compressive strength and specific energy absorption, and so as their strain rate sensitivities. So the high salinity environment has a significant effect of weaken the quasi-static and dynamic mechanical performance of concrete.