• Title/Summary/Keyword: satellite materials

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MEASUREMENTS OF ALBEDO AND SPECTRAL PATTERNS OF MAN-MADE SATELLITE MATERIALS (인공위성 재질별 반사율 및 분광유형 측정)

  • 이동규;김상준;이준호;한원용;민상웅
    • Journal of Astronomy and Space Sciences
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    • v.19 no.4
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    • pp.319-326
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    • 2002
  • Laboratory tests have been carried out for investigation of the spectroscopic characteristics at visible wavelength of 12 common satellite materials used in satellite bus and payload. The obtained spectral data show that the materials can be classified and identified since their spectral features and albedos distinctly differ among them. It is suggested that the result of the laboratory tests for the satellite materials can be used for the predictions of material types, material composition ratios, sizes, and masses in comparison with the spectral data obtained from observations of new satellites or space debris.

Modal Analysis and Failure Safety Estimation for the Satellite Antenna System Composed of Sandwich Structure with Laminated Face Sheet (적층된 외피를 갖는 샌드위치로 구성된 위성체 안테나 시스템의 모드 해석과 파손안전성 판별)

  • Oh, Se-Hee;Han, Jae-Hung;Oh, Il-Kwon;Shin, Won-Ho;Kim, Chun-Gon;Lee, In;Park, Jong-Heung
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.228-233
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    • 2001
  • Satellite system experiences severe mechanical loads during the launch period. Therefore, positive margin of safety of the satellite system must be demonstrated for every possible mechanical loading condition during the launch period. This paper presents modal and stress analysis result due to quasi-static loads for the satellite antenna system. The failure tendency for the sandwich construction of the satellite antenna system has been studied with various lamination angles of unidirectional prepreg.

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Development of Image Processing Software for Satellite Data

  • Chi, Kwang-Hoon;Suh, Jae-Young;Han, Jong-Kyu
    • Proceedings of the KSRS Conference
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    • 1998.09a
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    • pp.361-369
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    • 1998
  • Recently, the improvement of on-board satellite sensors covering hyperspectral image sensors, high spatial resolution sensors provide data on earth in diverse aspect. The application field relating remotely sensed data also varies depending on what type of job one wants. The various resolution of sensors from low to extremely high is also available on the market with a user defined specific location. The expense to purchase remote sensed data is going down compare to the cost it need past few years ago in terms of research or private use. Now, the satellite remote sensed data is used on the field of forecasting, forestry, agriculture, urban reconstruction, geology, or other research field in order to extract meaningful information by applying special techniques of image processing. There are many image processing packages available worldwide and one common aspect is that they are expensive. There need to be a advanced satellite data processing package for people who can not afford commercial packages to apply special remote sensing techniques on their data and produce valued-added product. The study was carried out with the purpose of developing a special satellite data processing package which covers almost every satellite produced data with normal image processing functions and also special functions needed on specific research field with friendly graphical user interface (GUI). And for the people with any background of remote sensing with windows platform.

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Vibration Analysis of Composite Satellite Antenna by Acoustic Excitation (음향 가진에 의한 위성 안테나의 진동해석)

  • ;;;;;Horst Stockburger
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.123-126
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    • 2002
  • Acoustic vibration analysis has been performed using random vibration analysis module of MSC/NASTRAN to evaluate the safety of the composite satellite antenna structure under the acoustic pressure from the launch vehicle. It was found that maximum $3\sigma$ stress by acoustic excitation was less than allowable stress.

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Thermal Characteristics of Hybrid Insert for Carbon Composite Satellite Structures

  • Lim, Jun Woo
    • Composites Research
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    • v.28 no.4
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    • pp.162-167
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    • 2015
  • Composite sandwich structures are widely employed in various applications, due to their high specific stiffness and specific bending strength compared to solid panels. Lately, for that reason, the advanced composite sandwich structures are employed in satellite structures: materials should be as light as possible with the highest attainable performance. This study is majorly focused on inserts employed to the composite sandwich satellite structures. A new hybrid insert design was developed in precedent study to reduce the mass of the sandwich structure since the mass of the satellite structure is related to high launching cost [1]. In this study, the thermal characteristics and behavior of the precedently developed hybrid insert with carbon composite reinforcing web and the conventional partial insert were numerically investigated.

Design and Analysis of Composite Surface-Antenna-Structure for the Satellite Communication (위성통신을 위한 복합재료 표면안테나 구조의 설계 및 해석)

  • 유치상;황운봉;박현철;박위상
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.10a
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    • pp.1-4
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    • 2002
  • The present study aims to design a multiplayer microstrip antenna with composite sandwich construction and to estimate structural behavior of this multiplayer structure for the next generation of structural surface technology. This is termed Surface-Antenna-Structure indicating that structural surface becomes antenna. Constituent materials were selected considering electrical properties as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.5 GHz and final demonstration article was $16\times16$ array antenna. From electrical measurements it was shown that antenna performances were in good agreement with design requirements. Structural analysis showed this antenna structure was well designed for the mechanical rigidity. All constituent materials were characterized independently. The SAS concept is the first serious attempt at integration for both antenna and composite engineers and promises innovative future communication technology.

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North Korea Cement Industry in Satellite Imagery (위성사진으로 본 북한의 시멘트 산업)

  • Baek, Chul-Seoung;Seo, Jun-Hyung;Cho, Jin-Sang;Ahn, Ji-Whan;Cho, Kye-Hong
    • Ceramist
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    • v.22 no.2
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    • pp.198-214
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    • 2019
  • The possibility of economic exchange with North Korea is increasing, but there is still a shortage of information of cement industry, which occupies the largest proportion of North Korean construction material industry. Therefore, this study researched the status of cement production facility management using satellite photographs of 16 cement factories in North Korea, and examined the operating status of North Korean cement industry by observing smoke discharged from the chimneys of the cement production facilities. When the satellite photographs were analyzed, it was observed that the monthly stack fog ratio of the North Korean cement factories was 55% in 2016, 60% in 2017 and nearly 65% in 2018. This demonstrates that the average operating ratio has been increasing continuously. However, the operation rate of the five major cement factories reaches the limit, actual cement production is estimated to have maintained the previous level or small increased.

Finite Element Analysis for Satellite Antenna Structures Subject to Forced Sinusoidal Vibration (위성 안테나 구조물의 정현파 강제 진동에 대한 유한 요소 해석)

  • Shin, Won-Ho;Oh, Il-Kon;Han, Jae-Hung;Oh, Se-Hee;Lee, In;Kim, Chun-Gon;Park, Jong-Heung
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.13-18
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    • 2001
  • This paper deals with finite element analysis for free vibration and forced sine vibration of Ka- and Ku- bend antenna structures using MSC/PATRAN/NASTRAN. The structures are designed to satisfy minimum resonance frequency requirement in order to decouple the dynamic interaction of the satellite with the spacecraft bus structure. From the forced sinusoidal vibration, we have observed output acceleration versus input in X-,Y- and Z- direction, based on base excitation using large mass method. The results of finite elements analysis can be used as the reference data for the experimental test of satellite antenna, resulting in the reduction of cost and time by predicting and complementing experimental data.

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