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고차 전단 변형이론에 의한 복합재료 적층판의 저속 충격응답
이영신,박웅,Lee, Young-Shin,Park, Oung 대한기계학회 1990 대한기계학회논문집 Vol.14 No.6
본 연구에서는 Kant 등이 제안한 고차판이론의 C연속변위 유한요소 모델을 사 용하여 충격자와 적층판의 저속 충격 응답에 대하여 연구하여 그 결과를 Mindlin의 판 이론에 의한 계산 결과와 비교하고, 경계 조건의 영향 및 충격자의 충격속도, 질량변 화에 대한 접촉력의 변화를 고찰하고자 한다. A $C^{0}$ continuous displacement finite element method based on a higher-order shear deformation theory is employed in the prediction of the transient response of laminated composite plates subjected to low-velocity impact. A modified contact law was applied to calculate the contact force during impact. The discrete element chosen is a nine-noded quadrilateral with 5 degree-of-freedom per node. The Wilson-.theta. time integration algorithm is used for solving the time dependent equations of the impactor and the central difference method was adopted to perform time integration of the plate. Numerical results, including the contact force history, deflection, and velocity history, are presented. Comparisons of numerical results using a higher order theory and a first-order theory show that using a higher order theory provides more accurate results. Effects of boundary condition, impact velocity, and mass of the impactors are also discussed.d.
스테이터-로터 상호간섭 및 점성효과를 고려한 케스케이드의 유체유발 진동해석
오세원(Oh, Se-Won),박웅(Park, Oung),김동현(Kim, Dong-Hyun) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.10
In this study, advanced computational analysis system has been developed in order to investigate flow-induced vibration(FIV) phenomenon for general stator-rotor cascade configurations. Relative movement of the rotor with respect to stator is reflected by modeling Independent two computational domains. Fluid domains are modeled using the unstructured grid system with dynamic moving and local deforming methods. Unsteady, Reynolds-averaged Wavier-stokes equations with one equation Spalart-Allmaras and two-equation SST ${\kappa}-{\varepsilon}$ turbulence models are solved for unsteady flow problems and also relative moving and vibration effects of the rotor cascade are fully considered. A coupled implicit time marching scheme based on the Newmark integration method is used for computing the governing equations of fluid-structure interaction problems. Detailed vibration responses for different flow conditions are presented and then vibration characteristics are physically investigated in the time domain as computational virtual tests.
점성 및 충격파효과를 고려한 천음속 터빈 케스케이드의 유체유발 진동해석
오세원(Oh, Se-Won),박웅(Park, Oung),김동현(Kim, Dong-Hyun) 한국소음진동공학회 2006 한국소음진동공학회 논문집 Vol.16 No.9
In this study, a fluid/structure coupled analysis system for simulating complex flow-induced vibration (FIV) phenomenon of cascades has been developed. The flow is modeled using Euler and Wavier-Stokes equations with different turbulent models. The fluid domains are modeled using the unstructured grid system with dynamic deformations due to the motion of structural boundary. The Spalart-Allmaras (S-A) and the SST ${\kappa}-{\omega}$ turbulent models are used to predict the transonic turbulent flows. A fully implicit time marching scheme based on the Newmark direct integration method is used in order to solve the coupled governing equations for viscous flow-induced vibration phenomena. For the purpose of validation for the developed FIV analysis system, comparison results for computational analyses of steady and unsteady aerodynamics and flutter analyses are presented in the transonic flow region. In addition, flow-induced vibration analyses for the isolated cascade and multi-blades cascade models have been conducted to show the physical fluid-structure interaction effects in the time domain.
김태완(Tea-Wan Kim),최성식(Sung-Sik Choi),박웅(Oung Park),조용주(Yong-Joo Cho) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The rise in temperature is closely related to the efficiency of operation in any slider bearing. If all factors that affect the rise in temperature are considered the calculation becomes very complicated. In this study a discriminat is proposed to determine the governing factor and temperature distributions are obtained based on this model. The optimal location of a thermometer is also decided to observe the behavior of temperature.
스테이터-로터 상호간섭 효과를 고려한 3차원 터빈 블레이드의 유체/구조 연계해석
김유성(Kim, Yu-Sung),김동현(Kim, Dong-Hyun),김요한(Kim, Yo-Han),박웅(Park, Oung) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.8
In this study, fluid/structure coupled analyses have been conducted for 3-D stator and rotor configuration. Advanced computational analysis system based on computational fluid dynamics(CFD) and computational structural dynamics(CSD) has been developed in order to investigate fluid/structure responses of general stator-rotor configurations. To solve the fluid/structure coupled problems, fluid domains are modeled using the structural grid system with dynamic moving and local deforming techniques. Reynolds-averaged Navier-Stokes equations with Spalart-Allmaras(S-A) and SST ${\kappa}-{\omega}$ turbulence models are solved for unsteady flow problems. A fully implicit time marching scheme based on the Newmark direct integration method is used for computing the coupled aeroelastic governing equations of the 3-D turbine blades for fluid-structure interaction(FSI) problems. Detailed fluid/structure analysis responses for stator-rotor interaction flow conditions are presented to show the physical performance and flow characteristics.