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유체구조상호작용 해석을 이용한 풍하중에 대한광폭 온실 구조물의 구조적 안전성 평가 방법 연구
최모건,이희남 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.1
This paper proposes a method to evaluate the structural safety of a large wide-width greenhouse structure against wind load caused by a typhoon through a fluid structure interaction analysis technique. The conventional method consisted of roughly estimating the wind load based on the relevant laws and regulations, and determining safety through structural analysis. However, since the wind load changes nonlinearly according to the wind speed distribution and wind direction around the greenhouse and the external shape of the structure, there are many uncertainties in the existing structural safety evaluation method, and it is difficult to accurately determine the design margin. In this study, a systematic method was developed to accurately calculate the wind load acting on a greenhouse structure and evaluate structural safety by considering the characteristics of wind through a fluid structure interaction analysis using coupled computational fluid dynamics and computational structural mechanics. Using the proposed method, it is possible to significantly reduce the manufacturing cost because it is possible to obtain an optimal design that reduces the over-conservative design margin while securing the structural strength of the greenhouse.
초기 각변위 및 각속도 조건에 대한 비선형 단진자의 일반 엄밀해
최모건,이희남 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.6
The nonlinear simple pendulum is investigated to find the exact closed-form analytical solution, satisfying initial conditions of angular position and angular velocity. While previous numerous studies have been conducted on the nonlinear simple pendulum, the exact closed-form analytical solution still remains not available in public domain for the most general initial condition including initial angular velocity as well as initial angular displacement. In this paper, the exact closed-form analytical solution for the general initial conditions is derived using Jacobi’s elliptic function and elliptic integral. The result was verified by comparing it with previous studies and the numerical solution of the equation of motion through the Runge-Kutta integration method.
최모건,이희남 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.1
The automatic dust separator is a device installed in the suction tank of the pumping or drainage plant, and prevents foreign substances such as aquatic plants or wood chips from being sucked into the underwater pump. Since the dust separator obstructs the flow of water for separating dusts, a water level difference is likely to occur before and after the dust separator. Since the water level difference before and after the dust separator acts as an additional hydraulic load on the dust separator structure, it may reduce the lifetime of the dust separator and cause damage. In this study, in order to reduce the water level difference, we devised changing the existing I-beam-shaped dust separator parts to a streamlined shape, and quantitatively analyzed the water level difference before and after the dust separator, hydraulic load, and flow velocity distribution through computational fluid analysis to confirm the effect of design improvement.
최모건(Morgan Choi),김지웅(Jiwoong Kim) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.11
본 보고서는 순천대학교 로켓동아리 ‘로켓단’에서 개발하고 제작한 로켓의 기술 보고서이다. 로켓의 미션에 대한 이론적 내용과 설계 및 제작 과정에 대한 보고이다. 로켓은 엔진, 제어, 사출의 3가지 파트로 나누어 개발하였으며 반작용 휠을 이용한 로켓의 roll축 제어를 탑재하였다. 무선통신을 활용한 양방향 통신을 진행하였다. 이 연구의 목표는 전국대학생로켓연합회 회원들과 함께 로켓의 안전성을 검증하고 기술을 점검 및 발전시키는 것에 그 목표를 둔다. This report is about Technology of Rocket developed by Suncheon National University Rocket Club ‘RocketDan’. This report include theoretical background of mission and process of design and production. Our team that seperated to 3part that composed Engine, Control, Parachute Ejection develop Rocket and Roll axis control system and Two-way communication Using Wireless Communication. Target of this Research is development of Rocket’s Stability and tecnology with NURA