• Title/Summary/Keyword: Flow and Structural Analysis

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Shear Flow Analysis of Aircraft Composite Wing Structure (항공기 복합재 날개구조 전단흐름 해석)

  • Choi Ik-Hyeon;Kim Seong-Chan;Kim Seong-Jun
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.75-78
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    • 2004
  • Traditionally aluminum alloy have been used in manufacturing of aircraft structures, and semi-monocoque structural concept have been mainly applied in structural design of fuselage and wing. However, recently monocoque structural concept is applied in many small-size aircraft structures manufactured with composite materials. In such case appling monocoque structural concept, in initial conceptual design stage on wing, it is not easy to analyze shear flow using classical shear flow analytical method because composite skin structure can support span-wise tension/compression stress as well as sectional shear stress. In this study, an extended shear-flow analytical method to apply to composite monocoque structural concept was developed through extending the classical shear-flow analytical method.

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Structural intensity analysis of a large container carrier under harmonic excitations of propulsion system

  • Cho, Dae-Seung;Kim, Kyung-Soo;Kim, Byung-Hwa
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.2 no.2
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    • pp.87-95
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    • 2010
  • The structural intensity analysis, which calculates the magnitude and direction of vibrational energy flow from vibratory velocity and internal force at any point of a structure, can give information on dominant transmission paths, positions of sources and sinks of vibration energy. This paper presents a numerical simulation system for structural intensity analysis and visualization to apply for ship structures based on the finite element method. The system consists of a general purpose finite element analysis program MSC/Nastran, its pre- and post-processors and an in-house program module to calculate structural intensity using the model data and its forced vibration analysis results. Using the system, the structural intensity analysis for a 4,100 TEU container carrier is carried out to visualize structural intensity fields on the global ship structure and to investigate dominant energy flow paths from harmonic excitation sources to superstructure at resonant hull girder and superstructure modes.

Research on Vibro-acoustic Coupled Analysis using Power Flow Finite Element Method (파워흐름유한요소법을 이용한 진동음향 연성해석 연구)

  • Kim, Sung-Hee;Kwon, Hyun-Wung;Hong, Suk-Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.767-770
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    • 2006
  • To predict vibrational energy density of simple structural-acoustic coupled systems in medium-to-high frequency ranges, Power Flow Finite Element Method(PFFEM) is used, and PFFEM sofiware, PFADS has been developed for the vibration predictions and analysis of coupled system structures in medium-to-high frequency ranges. However, it needs to consider vibro-acoustic coupled analysis to get more accurate results. Prior to implement vibro-acoustic coupled analysis functions in PFADS, research on vibro-acoustic coupled analysis using PFFEH is performed for simple models. These predictions include the indirect transmission path associated, and also the direct transmission path, and the formulation is extended to structural system model by using appropriate modifications to structural-acoustic and acoustic-acoustic joint matrices. Concerning the waves in plate and acoustic, it is possible to calculate the structural-acoustic full matrix of a model using PFFEM, and the formulations developed are implemented for two rooms surrounded by plates.

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Flow-Induced Vibration Characteristics of a Missile Control Surface Considering Shock Wave and Structural Nonlinearity (충격파 및 구조비선형성을 고려한 미사일 조종면의 유체유발 진동특성)

  • Kim, Dong-Hyun;Lee, In;Kim, Seung-Ho
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.389.2-389
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    • 2002
  • Nonlinear aeroelastic characteristics of a missile control surface are investigated in this study. The wing model has freeplay structural nonlinearity at its pitch axis. Nonlinear aerodynamic flows with unsteady shock waves are also considered in high-speed flow region. To effectively consider a freeplay structural nonlinearity, the fictitious mass method (FMM) is applied to structural vibration analysis based on finite element method (FEM). (omitted)

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Numerical Analysis Study on Structural Safety and Flow Coefficient of Quadruple Offset Butterfly Valve (사중편심 버터플라이 밸브의 구조 안전성 및 유량계수에 관한 수치해석적 연구)

  • Kim, Geon-Ho;Cha, Jong-Kook;Kim, Gyu-Cheol;Jeong, Dae-Yeong;Lee, Bong-Hee
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.2_2
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    • pp.279-287
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    • 2022
  • Butterfly valves installed on ships use valves with up to triple offset to improve tightness. However, the triple offset valve has structural problems such as disc deformation and seat separation. Accordingly, interest in quadruple offset butterfly valves with added offset is increasing. In this study, the structural safety of the quadruple offset butterfly valve was examined through numerical analysis. In addition, we intend to evaluate the performance of the valve through flow coefficient analysis.

Structural Safety of Lightweight Valve Disc by Topology Optimization Design based on Computational Simulation (전산 시뮬레이션 기반의 위상최적설계에 의한 경량 밸브디스크의 구조적 안전성)

  • Kim, Taehyung
    • Journal of Energy Engineering
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    • v.29 no.3
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    • pp.25-33
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    • 2020
  • In this study, flow and structural computational analysis were performed to investigate the structural safety of the lightweight butterfly valve disc designed by topology optimization. After flow analysis, as the opening angle increased, the flow coefficient increased non-linearly and showed a gentle slop. When the opening angle was 12 degree, the cavitation could be predicted. After FE analysis, all FE von-Misses stresses of the lightweight disc were smaller than the yield strength of the material, and all FE maximum deformations were also smaller than the conservative deformation of the previous study. Ultimately, it was confirmed that the structural safety of the lightweight valve disc based on computational analysis is effective.

Evaluation of Structural Integrity for HANARO Capsule Structure by Vibration Test and Analysis (진동시험 및 해석을 통한 하나로 캡슐 구조물의 구조건전성 평가)

  • 이영신;강연환;최명환;신도섭
    • Journal of KSNVE
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    • v.10 no.2
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    • pp.261-268
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    • 2000
  • The instrumented capsule is subjected to flow-induced vibration(FIV) due to the flow of the primary coolant and then the structural integrity of the capsule during irradiation in the HANARO reactor is an issue of major concern. For this purpose the acceleration was measured by four accelerometers attached to the protection tube of the capsule mainbody and the displacement of test holes was calcultated using commercial finite element program ANSYS to evaluate the structural interference with the neighboring flow tubes under the reactor operating condition. The calculated displacements of test holes in the reactor in-core were found to be lower than the values of allowable design criteria.

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Numerical Analysis of Y-shaped Check Valve for Power Plant (발전소용 Y형 체크밸브에 관한 수치해석 연구)

  • Lee, Jae-Hun;Kim, Si-Pom;Jeon, Rock-Won;Lee, Geun-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.1
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    • pp.129-135
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    • 2016
  • Various type of valves are manufactured for different industrial uses. Among them, check valves are used to allow fluid to flow in one direction but not in the opposite direction. There are many different types of check valves, but Y-shaped check valves are widely used these days. Not many studies have been carried out on Y-shaped check valves and the flow coefficients obtained through numerical analysis have the problem of low reliability. In order to solve this problem, this study performed flow analysis, flow-structure coupled analysis, and flow coefficient measurement experimentally, and through these analyses derived and verified the flow coefficients and assessed the structural safety based on numerical analysis.

A Study on the New Method for Structural Analysis and Design by MDO(Multidisciplinary Design Optimization) Methodology : Application to Structural Design of Flap Drive System (MDO기법에 의한 새로운 구조해석 및 설계기법 고찰: 플랩 구동장치의 구조설계에의 적용)

  • 권영주;방혜철
    • Korean Journal of Computational Design and Engineering
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    • v.5 no.2
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    • pp.184-195
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    • 2000
  • MDO (Multidisciplinary Design Optimization) methodology is an emerging new technology to solve a complicate structural analysis and design problem with a large number of design variables and constraints. In this paper MDO methodology is adopted through the use of computer aided systems such as Geometric Solid Modeller, Mesh Generator, CAD system and CAE system. And this paper introduces MDO methodology as a new method for structural analysis and design through the application to the structural design of flap drive system. In a MDO methodology application to the structural design of flap drive system, kinetodynamic analysis is done using a simple aerodynamic analysis model for the air flow over the flap surface instead of difficult aerodynamic analysis. Simultaneously the structural static analysis is done to obtain the optimum structural condition. And the structural buckling analysis for push pull rod is also done to confirm the optimum structural condition (optimum cross section shape of push pull rod).

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Nonlinear finite element analysis of reinforced concrete structures subjected to transient thermal loads

  • Zhou, C.E.;Vecchio, F.J.
    • Computers and Concrete
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    • v.2 no.6
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    • pp.455-479
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    • 2005
  • This paper describes a 2D nonlinear finite element analysis (NLFEA) platform that combines heat flow analysis with realistic analysis of cracked reinforced concrete structures. The behavior models included in the structural analysis are mainly based on the Modified Compression Field Theory and the Distributed Stress Field Model. The heat flow analysis takes into account time-varying thermal loads and temperature-dependent material properties. The capability of 2D nonlinear transient thermal analysis is then implemented into a nonlinear finite element analysis program VecTor2(C) for 2D reinforced concrete membranes. Analyses of four numerical examples are performed using VecTor2, and results obtained indicate that the suggested nonlinear finite element analysis procedure is capable of modeling the complete response of a concrete structure to thermal and mechanical loads.