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  • Title/Summary/Keyword: 구조해석 소프트웨어

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Prediction of Shielding Effectiveness in Honeycomb Structure Using the Modified Design Equation (수정된 설계 방정식을 이용한 허니컴 구조의 차폐 효과 예측)

  • Lee Kyung-Won;Cheong Yeong-Chul;Hong Ic-Pyo;Yook Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.9 s.100
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    • pp.862-871
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    • 2005
  • In this paper, the modified design equation of shielding effectiveness was presented to predict more accurately the shielding effectiveness of honeycomb structure with hexagonal waveguide. The design equation of shielding effectiveness in honeycomb was represented from adding shielding effectiveness of single lattice to shielding effectiveness of infinite array of single lattice. This paper proposed the generalized design equation of shielding effectiveness by analyzing basis lattice of hexagonal waveguide which composes honeycomb structure and infinite array structure of basis lattice. To provide the validity of the modified design equation of shielding effectiveness in this paper, comparison with other available date using 3D EM commercial software is made.

Compressive Behavior for Smart Skin of Sandwich Structure (스마트 스킨 샌드위치 시편의 압축거동 연구)

  • Kim, Young-Sung;Kim, Yong-Bum;Park, Hoon-Cheol;Yoon, Kwang-Joon;Lee, Jeo-Hwa
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.8
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    • pp.56-64
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    • 2002
  • In this work, a smart skin of multi-layer structure is designed and manufactured. Through the compression test, the characteristic of smart skin behavior was examined. We have predicted stress of each layer and the first failed layer of the smart skin structure by using MSC/NASTRAN. The finite element model was verified by comparing measured data from the compression test and result from the geometrically linear/non-linear analysis. The finite element model was used for obtaining design data from the parametric study. It was confirmed that shear moduli of honeycomb core affect the buckling load of smart skin where shear deformation was considerable.

Structural Safety Evaluation for the Hydraulic Power Unit of Topside Module According to the Movement of Offshore Plant (해양구조물 움직임에 따른 Topside Module의 HPU에 대한 구조안전성 평가)

  • Ryu, Bo-Rim;Lee, Jin-Uk;Kang, Ho-Keun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.6
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    • pp.723-731
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    • 2020
  • The design of offshore plants should reflect the various requirements of the owner and the classification society. For a topside module mounted on an of shore structure, the design process is very demanding because of the large spatial constraints and the many requirements related to marine environmental conditions and safety such as the movement of the structure. In this study, the load acting on the hydraulic power unit, which is one of the main equipment in the topside module, was calculated according to the DNVGL rule; the structural safety was evaluated according to each load condition and the structural reliability of the developed product was improved. For structural analysis, MSC software was used, and structural analysis was performed under five load conditions to review structural safety for various movements. The results show that the maximum stress occurred during pitching toward the stern (Load Case 5). The stress level was approximately 85 % of the allowable stress, and the maximum deformation was approximately 5 % of the allowable value. The structural safety was confirmed, and no intermember interference occurred.

Seismic Damage Analysis Of Concrete Gravity Dam Using ABAQUS (ABAQUS 소프트웨어를 이용한 콘크리트 중력댐의 지진손상해석)

  • Shin, Dong-Hoon;Nghia, Nguyen Trong;Park, Han-Gyu;Park, Kyung-Ho
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.530-533
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    • 2009
  • This study deals with 2D and 3D nonlinear seismic damage analysis of a concrete gravity dam using the finite element program ABAQUS and the concrete damaged plasticity model. 2D and 3D spillway sections of the dam are simulated. First the frequency analysis is conducted to compare the fundamental frequency and estimate the value of damping coefficient. Then the seismic analysis is conducted using the simulated ground acceleration motion. The relative displacement between the crest and bottom of the dam is obtained and compared for the maximum value and occurrence time. The results indicate that the plane-stress assumption gives similar results of maximum relative displacement and final damage distribution with 3D analysis.

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Software Technique for Automation of Moving Load Analysis for Three-dimensional Frame Model of Girder Bridge (거더 교의 3차원 뼈대 모델 해석시에 이동 하중의 자동화를 위한 소프트웨어 기법)

  • 정대열
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.04a
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    • pp.218-225
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    • 1999
  • In order to completely automatize the moving load analysis for the three-dimensional frame model of the girder bridge, the efficient software technique is presented, which makes use of the signal among processes. If this software technique is used in automation, the separate algorithm is not needed for the transverse loading analysis, and the complete automatic moving load analysis algorithm can be easily developed. The program, which has the complete automatic moving load analysis function, has been developed with using this software technique, and has been verified by comparing the results with the one in the famous design book.

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Life Assessment of Gas Turbine Blade Based on Actual Operation Condition (실 운전조건을 고려한 가스터빈 블레이드 수명평가)

  • Choi, Woo Sung;Song, Gee Wook;Chang, Sung Yong;Kim, Beom Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.10
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    • pp.1185-1191
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    • 2014
  • Gas turbine blades that have complex geometry of the cooling holes and cooling passages are usually subjected to cyclic and sustained thermal loads due to changes in the operating characteristic in combined power plants; these results in non-uniform temperature and stress distributions according to time to gas turbine blades. Those operation conditions cause creep or thermo-mechanical fatigue damage and reduce the lifetime of gas turbine blades. Thus, an accurate analysis of the stresses caused by various loading conditions is required to ensure the integrity and to ensure an accurate life assessment of the components of a gas turbine. It is well known that computational analysis such as cross-linking process including CFD, heat transfer and stress analysis is used as an alternative to demonstration test. In this paper, temperatures and stresses of gas turbine blade were calculated with fluid-structural analysis integrating fluid-thermal-solid analysis methodologies by considering actual operation conditions. Based on analysis results, additionally, the total lifetime was obtained using creep and thermo-mechanical damage model.

Electromagnatic Effect Analysis inside Electrically Large Structures Using Topological Modeling and PWB Method (위상학적 모델링과 PWB Method를 이용한 대형 구조물 내부의 전자파 영향 해석)

  • Lee, Jae-Min;Jung, In-Hwan;Lee, Jae-Wook;Lee, Young-Seung;Kwon, Jong-Hwa
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.3
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    • pp.284-290
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    • 2016
  • As the recently advanced scientific developments result in high lever of the usability and the needs for the electrical equipment and devices in various situations, the safety technologies protecting malfunction and electrical critical damages including soft and hardware from the unexpectedly radiated electromagnetic interferences are required gradually. In addition, the numerical analysis for the miniaturized electrical components and equipments as well as the conventional electrical devices installed inside the electrically large enclosures and structures requires the memory requirement and time consumption too big to be handled in a realistic situation, which will result in a limitation in solving the complete set of maxwell's equations. In this paper, PWB method based on statistical theory and topological modeling with appropriate zoning concepts are introduced for the EM analysis of an electrically large complex structures.

Analysis of SAR Image Quality Degradation due to Pointing and Stability Error of Synthetic Aperture Radar Satellite (위성체 지향 및 안정화 오차로 인한 영상레이더 위성 영상 품질 저하 해석)

  • Chun, Yong-Sik;Ra, Sung-Woong
    • Journal of Astronomy and Space Sciences
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    • v.25 no.4
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    • pp.445-458
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    • 2008
  • Image chain analysis of synthetic aperture radar (SAR) satellite is one of the primary activities for satellite design because SAR image quality depends on spacecraft bus performance as well as SAR payload. Especially, satellite pointing and stability error make worst effect on the original SAR image quality which is implemented by SAR payload design. In this research, Image chain analysis S/W was developed in order to analyze the SAR image quality degradation due to satellite pointing and stability error. This S/W consists of orbit model, attitude control model, SAR payload model, clutter model, and SAR processor. SAR raw data, which includes total 25 point targets in the scene of 5km×5km swath width, was generated and then processed for analysis. High resolution mode (spotlight), of which resolution is 1m, was applied. The results of image chain analysis show that radiometric accuracy is the most degraded due to the pointing error. Therefore, the successful design of attitude control subsystem in spacecraft bus for enhancing the pointing accuracy is most important for image quality.

Reconstruction of α-helices in a Protein Molecule (단백질 분자 내 α-헬릭스의 재구성)

  • Kang, Beom Sik;Kim, Ku-Jin;Seo, U Deok
    • KIPS Transactions on Software and Data Engineering
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    • v.3 no.4
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    • pp.163-168
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    • 2014
  • In a protein molecule, α-helices are important for protein structure, function, and binding to other proteins, so the analysis on the structure of helices has been researched. Since an interaction between two helices is evaluated based on their axes, massive errors in protein structure analysis would be caused if a curved or kinked long α-helix is considered as a linear one. In this paper, we present an algorithm to reconstruct α-helices in a protein molecule as a sequence of straight helices under given threshold.

The Design of Miniaturized Waveguide Bandpass Filters with Improved Spurious Characteristics (Spurious 특성이 우수한 계단형 불연속 구조 소형 도파관 대역통과 여파기의 설계)

  • 성규제;윤상원
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.2
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    • pp.237-246
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    • 1999
  • A miniaturized waveguide bandpass filter is designed by combining a corrugated lowpass structure and a highpass configuration based on the cut-off effect of waveguides. It is smaller than the conventional waveguide bandpass filter composed of half-wavelength resonators and has wider spurious free characteristics. Optimized design data for a seven-order waveguide bandpass filter with the symmetrical structure are given at the center frequency of 10 GHz with 800 MHz bandwidth. Measured bandwidth of the center frequency of 9.97 GHz is 840 MHz and measured insertion loss is 0.97dB, The length of the bandpass filter is 64.38mm. The first spurious response is produced at 26.1 GHz.

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