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Aortic valve가 coronary artery의 혈류와 FFR에 미치는 영향에 대한 수치해석적 연구
김근홍(Geun-Hong Kim),권순성(Soon-Sung Kwon),김국태(Gook Tae Kim),황사빈(Sa Bin Hwang),심은보(Eun Bo Shim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In coronary artery disease, aortic valve may have a critical effect for stenosed coronary flow. Vortex formed by the aortic valve in sinus valsalva increases coronary flow. Therefore, we have built up coronary artery model containing aortic valve. For this purpose, coronary 3D model with the aortic valve was made based on anatomical shape. Then, we developed lumped parameter model of coronary circulation. Blood is assumed incompressible and Newtonian fluid. Finite element analysis was performed for Navier-Stokes equation. Then we compared the hemodynamic charateristics of the models with and without aortic valve.
김근홍(Geun-Hong Kim),이영신(Young-Shin Lee),양형렬(Hyung-Lyeol Yang) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.4
금속씰의 탄성복원력은 기밀성능을 결정하는 매우 중요한 요소이다. 본 연구는 장시간 운전조건에서 기밀성능을 유지할 수 있는 금속오링씰의 구조, 즉 탄성복원력이 우수한 구조를 얻기 위하여 컴플라이언트 메커니즘 위상최적화법을 도입하였다. 진화구조최적화법의 위상최적화 알고리듬이 사용되었으며, 강성 및 유연성을 동시에 고려하는 두 가지 종류의 목적함수가 사용되었다. 금속오링씰의 외형을 고려하여 원형의 최적화 설계영역이 고려되었으며 최적화 결과로 나타난 위상의 탄성복원력은 상용품의 탄성복원력과 비교되었다. The elastic recovery of a metal seal is a factor that can be used to assess its sealing performance. In this study, a compliant mechanism topology optimization has been performed to find a structure of a metal O-ring seal that can maintain excellent sealing performance with a maximized elastic recovery over extended operation. An evolutionary structural optimization (ESO) was used as a topology optimization algorithm with two different types of objective functions considering both flexibility and stiffness. In particular, a circular design domain was adopted to consider the outer shape of the metal O-ring seal. The elastic recovery of the optimal topology was calculated and compared to that of a commercial product.