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디퓨저 베인에 의한 공진조건에서의 임펠러 구조 안정성 평가
김용세(Yongse Kim),공동재(Dongjae Kong),신상준(Sangjoon Shin),임강수(Kangsoo Im),박기훈(Kihoon Park) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
원심압축기 임펠러의 블레이드는 고속회전과 정상유동 압력에 의한 정적하중이 가해진다. 동시에 임펠러와 디퓨저 베인 간 상호작용에 의해 발생하는 비정상 유동의 공력가진력이 공진조건에서 주기적으로 임펠러를 가진함에 따라 임펠러 블레이드의 고주기피로 파손이 발생할 수 있다. 이에 대한 정밀한 구조응답 예측을 위해 ANSYS를 이용한 비정상 유동 해석과 모드해석을 각기 수행하여 공력가진력과 주요 공진조건을 도출하였다. 이 후 공력-구조를 연계하는 단일방향의 강제진동 해석을 수행하고, 결과들을 토대로 고주기피로에 대한 안전도를 평가하였다. Impeller blades in the centrifugal compressor are subjected to static loads due to the high-speed rotation and steady aerodynamic forces. At the same time, aerodynamic excitations by the interaction between the impeller and the diffuser vanes(DV) periodically excite the impeller blades in resonant conditions, which may lead to high cycle fatigue (HCF) and eventually result in failure of the blades. In order to predict the structural response accurately, the aerodynamic excitation and the major resonant conditions were predicted by performing the unsteady flow analysis and modal analysis using ANSYS. Next, a unidirectional forced vibration analysis was performed by using fluid-structure interaction (FSI) method, and the safety of HCF was evaluated based on the results.
디퓨저 베인에 기인한 공진조건에서의 임펠러 강제진동 및 구조응답 예측
김용세(Yongse Kim),공동재(Dongjae Kong),신상준(SangJoon Shin),박기훈(Kihoon Park),임강수(Kangsoo Im) 한국추진공학회 2018 한국추진공학회지 Vol.22 No.4
Impeller blades in the centrifugal compressor are subjected to periodic aerodynamic excitations by interactions between the impeller and the diffuser vanes (DV) in resonant conditions. This may cause high cycle fatigue (HCF) and eventually result in failure of the blades. In order to predict the structural response accurately, the aerodynamic excitation and the major resonant conditions were predicted using unsteady computational fluid dynamics (CFD) and structural analysis. Then, a forced vibration analysis was performed by going through one-way fluid-structure interaction (FSI). A numerical analysis procedure was established to evaluate the structural safety with respect to HCF. The numerical analysis procedure proposed in this paper is expected to contribute toward preventing HCF problems in the initial design stage of an impeller.
3D 프린팅을 이용한 소형 무인기 설계·제작 교육 프로그램을 위한 수업자료 개발과 적용
김시태(Kim, Sitae),김민성(Kim, Minseong),공동재(Kong, Dongjae) 한국공학교육학회 2021 공학교육연구 Vol.24 No.5
This study introduces the development and application of instructional materials for a micro-UAV (unmanned aerial vehicle) design and manufacturing program in university education for freshman/sophomore students. The ADDIE methodology was applied to the development of educational materials, which consist of 15 lessons including the aircraft design theory, 3D CAD modeling, 3D printing production, and UAV flight control. The validity of the program was evaluated with 8 expert panels. A total of 82 participants from engineering and social science grouped the 16 teams for the creative UAV wing design and cooperative interactions. The results of overall program satisfaction survey was measured highly as the average 4.54 (out of 5), so that the students were content with the professional engineering knowledge, 3D digital tools, and the opportunity to design and manufacture airplanes on their own. In conclusion, it can be confirmed that the developed program is effective for UAV education for junior level college student.