• Title/Summary/Keyword: 거동분석시스템

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AIS 데이터를 활용한 선박의 항적모니터링 기능구현에 관한 연구

  • Kim, Eun-Gyeong;Jeong, Jung-Sik;Park, Gye-Gak
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2012.10a
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    • pp.138-140
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    • 2012
  • 본 연구에서는 실제 AIS의 정적, 동적 데이터를 수집하여 항계내 통항 선박의 움직임을 파악하였다. 실제 완도항 부근의 직선항로을 통항하는 선박 항적의 분석하여 불규칙적인 선박의 특성을 알아보고자 하였다. 기존의 과거 누적 데이터의 퍼지이론을 활용한 이상 거동의 선박식별 시스템은 전문가 시스템에 의존하여 항적의 비정상성을 판단하므로 항로의 특성에 따른 실 항해상황을 간과할 수 있는 문제점이 있다. 본 연구는 실시간 AIS 정보를 활용하여 항로이탈의 변화율에 해당하는 곡률분석, 항로선으로부터 좌우의 변동을 보다 정확하게 모니터링 할 수 있는 이상 거동 선박을 식별하는 방법을 제안한다. 본 연구는 VTS 및 VMS의 응용서비스로서 해양사고의 사전예방을 위한 연안 및 항만수로의 효율적인 관리에 기여할 것이다.

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The Stability and Characteristic Analysis of Cut Slope Behavior using Real-time Monitoring System (상시 계측시스템을 이용한 붕괴 절토사면 거동 특성 분석 및 안정성 해석)

  • Baek, Yong;Koo, Ho-Bon;Jang, Ki-Tae;Yoo, Byung-Sun;Bae, Gyu-Jin
    • The Journal of Engineering Geology
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    • v.14 no.1
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    • pp.71-80
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    • 2004
  • The failure of cut slopes frequently occurs particularly during the thawing season and the rain season in summer. This study interpreted data collected from site to which a real-monitoring system was applied in order to analyze the causes of ground behaviors and to forecast future slope failure. As for research methods, this study analyzed the size and mechanism of failure by integrating the results of field surveys and measurements. Furthermore, it analyzed data transmitted by the monitoring system installed in the a result, three times of ground displacement occurred as well as a number of partial tension cracks. The cut slope composed of sandstone and siltstone started its initial behavior as a result of torrential downpour and the loss of support of the substructure. For quantitative analysis of the characteristics of ground behavior, this study measured 5 lateral lines. According to the result of the measurement, displacement happened little in the section to which countermeasure had been applied, but displacement of maximum 400mm happened in the section to which countermeasure had not bee applied. The analysis of data on displacement and rainfall suggested a close relationship between ground behavior and rainfall. According to the result of stability interpretation along with the change of ground saturation, stability rate appeared to be less than 1.0 when ground saturation is over 55%. Although the current trend of ground behavior is at a stable stage falling within the range of tolerance, it is considered necessary to continue monitoring and data analysis because ground displacement is highly possible with the change of temperature during the winter.

Study on the thermal expansion properties of Fe alloys for the flexible substrate of CIS thin film solar cell (CIS 박막태양전지용 철계 연성 기판재의 열팽창 특성 연구)

  • Han, Yoonho;Lim, Minsu;Song, Youngsik;Cho, Yongki;Yim, Taihong
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.44.2-44.2
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    • 2010
  • 차세대 태양전지로써 플렉서블 태양전지에 대한 연구가 활발하다. CIS 박막태양전지의 경우도 Glass base 태양전지 시스템 연구와 더불어 금속과 플라스틱 등 연성 기판재를 이용한 전지 시스템에 관한 연구가 진행 되고 있다. 그러나 태양전지의 핵심 부자재라고 할 수 있는 기판재에 대한 체계적인 연구는 미흡한 실정이다. 특히 플렉서블 박막태양전지용 기판재와 그 위에 적층되어 태양전지를 구성하는 박막 소재의 열팽창 거동들 사이에 차이가 있어 태양전지 시스템에 결함을 야기할 수 있다. 본 연구에서는 플렉서블 태양전지용으로 적용되거나 연구되고 있는 SUS 300 계열과 SUS 400번 계열을 중심으로 철계 연성 기판재의 열팽창 거동을 비교 분석하였다. 그리고 CIS 박막태양전지 제조 공정인 고온 박막 생성 공정의 열분석을 통해 기판재의 성능을 평가 하였다.

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The behavior of boron segregation according to heat input in the weld CGHAZ of low alloyed steel (용접 입열량에 따른 저합금강 용접부 CGHAZ의 보론 편석거동 분석)

  • Kim, Sang-Hoon;Lee, Jong-Ho;Lee, Kyung-Sub;Hwang, Byoung-Chul;Lee, Chang-Gil;Lee, Chang-Hee
    • Proceedings of the KWS Conference
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    • 2009.11a
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    • pp.60-60
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    • 2009
  • 본 연구는 보론이 첨가된 저합금강 용접 열영향부에서의 보론 편석 거동 연구를 위해 보론이 10ppm 첨가된 저합금강을 이용하여 다양한 용접 입열량 및 외부 응력에 따른 용접부 CGHAZ의 보론 편석거동을 분석하였다. 이를 위해 Gleeble 시스템을 이용하여 다양한 입열량에 따른 CGHAZ를 열 및 열-응력 사이클을 통하여 재현하였다. 재현된 시편의 미세조직은 OM을 통하여 분석하고, 보론의 편석거동을 SIMS와 PTA 분석법을 통하여 분석하였다. 그 결과 입열량에 따른 보론의 편석 거동은 최초 입열량이 증가함에 따라 보론의 편석이 증가하다가 다시 감소하였는데 이는 비평형 편석 후 고온에서 유지시간이 길어짐에 따라 back diffusion 발생에 따른 영향으로 판단된다. 또한 외부 응력에 의한 보론 편석 거동 분석 결과, 용접 열 사이클 중 작용하는 외부 응력에 의해 결정립계 편석 감소하였는데 이는 외부 응력에 의한 오스테나이트 결정립 크기 감소에 따른 결정립계 증가의 영향으로 판단된다.

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The Experimental Study on the Effect of Track System on the Integral Behavior of Railway Bridge (궤도시스템이 철도교량의 정.동적거동에 미치는 영향에 관한 실험적 연구)

  • Sung, Deok-Yong;Park, Yong-Gul;Choi, Jung-Youl;Kim, Sung-Il
    • Journal of the Korean Society for Railway
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    • v.13 no.2
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    • pp.186-193
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    • 2010
  • Track system and periodic live load are characteristics of railway bridges. In the design and construction of railway bridge, periodic live load increases the importance of dynamic behavior. And It is well known that behavior of railway bridge may be affected by track system in real bridge. Through experimental study, static and dynamic behaviors were investigated. Deflection and stress due to bending moment were measured, the location of neutral axis of each section, natural frequency, damping ratio were analyzed for each three track systems - girder only, installed ballast track system and installed concrete slab track system. According to measured values for the each type of track system, concrete track system increases the stiffness of bridge by 50%, and ballast system does by 7%, dynamic responses of structure change linearly with the magnitude of load and location of neutral axis of each sections varies with each track system. Damping ratio is almost equal without and with track. Therefore, the effects of track system on the integral behaviors of railway bridge can not be ignored in the design of bridge, especially in the case of concrete slab track system. So study of the quantitative analysis method for effects of track system must be performed.

Fast Analysis of Rock Block Behavior on Underground Opening considering Geostatic Stress Conditions (지체응력조건을 고려한 지하공동 주변부 암석블록의 신속한 거동 안정성 분석)

  • Kang, Il-Seok;Song, Jae-Joon
    • Tunnel and Underground Space
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    • v.29 no.1
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    • pp.64-74
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    • 2019
  • Behavior of a rock block consisting of rock joints during excavation of an underground opening is an important factor for the mechanical stability of the opening. In this study, the behavior of a rock block under different geostatic stress and joint property conditions was analyzed quantitatively. The behavior of the rock block analyzed by 3DEC numerical analysis was compared with that of the theoretical calculation, and the error between the theoretical value and the numerical analysis result was analyzed under various geostatic stress and joint property conditions. The result of the stability analysis of a rock block showed less than 5% of error with numerical simulation result, which verified the applicability of the purposed analytic solution.

Lateral Resisting Behavior of Reinforced Concrete Shear Wall and Flat Plate Column (철근콘크리트 전단벽과 무량판 기둥의 횡저항 거동)

  • Kim, Tae-Wan;Min, Chan-Gi
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.14-17
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    • 2010
  • 본 논문에서는 국내에서 주상복합건물에 주로 건설되는 철근콘크리트 전단벽과 무량판 골조 기둥 시스템의 횡저항 거동을 조사, 분석하였다. 이 시스템의 내진설계 시 건물골조시스템을 적용하게 되는데 전단벽 설계는 큰 어려움이 없으나 골조의 경우 변형의 적합성을 고려해야 할 경우에 상세하고 명확한 지침이 마련되어 있지 않아 그 적용이 쉽지 않다. 이를 해결하기 위하여 예제 건물을 선정하여 기준에 따라 설계한 후 비선형정적 해석을 수행하여 철근콘크리트 전단벽과 무량판 골조 기둥의 비선형 거동을 조사하였다. 그 결과 무량판 골조 기둥의 거동은 전단벽에 종속되었고 변형의 적합성을 고려하기 위해 골조의 모멘트를 증폭하더라도 기둥의 단면 변화가 크지 않으므로 실무적으로 큰 어려움이 없는 것으로 나타났다. 다만 강도뿐만 아니라 변형 능력에 대해서도 추가적인 연구가 필요하다.

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A Behavior Analysis in the Circular Hybrid Subminiture Energy Harvesting Device (순환형 하이브리드 초소형 에너지 수확장치에서의 거동 해석)

  • Bae, Young-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.11
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    • pp.1691-1696
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    • 2013
  • In this paper, an analysis of behavior is performed in the circular hybrid energy harvesting device. This analysis of behavior is to confirm with or without an existence of nonlinear system because its system is required to produce the more energy. To do this, first of all the phase portrait is reconstructed through Taken's embedding method, and then Poincare map is organized by using phase portrait and finally Lyapunov exponent is analyzed.

A Study on Real-Time SOC Structure Behavior Evaluation System using Big Data (Big data를 이용한 실시간 SOC 구조물 거동분석 시스템 연구)

  • Jung-Youl Choi;Jae-Min Han;Dae-Hui Ahn;Jee-Seung Chung
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.1
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    • pp.691-695
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    • 2023
  • Currently, the utilization of measurement results of the automated measurement system is very low and is at the level of providing only fragmentary measurement results. In this study, we are going to study a structure behavior analysis 3D display system with high precision and reliability for automated measurement data obtained by constructing big data by transmitting massive data values measured in real time to the cloud and using a Python-based algorithm. As a result of the study, as a system that can evaluate the behavior of a structure to a manager in real time, it provides analysis data in real time without significant restrictions regardless of the type of measurement data and sensor, and derived it as a 3D display. In addition, it was analyzed that the manager could grasp the behavior graph of the structure in real time and more easily judge the derivation of the weak part of the structure through data analysis. In the future, by analyzing the behavior of structures in three dimensions using past and present data, it is expected that more effective measurement results can be obtained in terms of repair, reinforcement, and maintenance of realistic structures.

Dynamic Analysis of Wave Energy Generation System by Using Multibody Dynamics (다물체 동역학을 이용한 파력발전기의 동적거동 분석)

  • Jang, Jin-Seok;Sohn, Jeong-Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1579-1584
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    • 2011
  • This paper discusses an energy system that can convert wave energy into electrical energy. This wave energy generation system is movable and has 12 arms and one generator. A multibody dynamic model for this system is established by using kinematic constraints. A gear mechanism, several kinematic constraints, and force elements are included in the model. Wave forces are obtained numerically from the time domain formulation based on the Morison equation. The MSC/ADAMS program is employed to carry out dynamic analysis of the wave energy generation system. The dynamic behavior responses of this system are analyzed for design verification. According to the results of the dynamic analysis, the yaw motion is relatively stable and kinetic energy sufficient to generate electrical energy is obtained when the wave height exceeds 1m.