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RISS 인기검색어
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- 저자 : 안창기(Chang-Gi Ahn) (검색결과 9 건)
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안창기(Chang-Gi Ahn),배용채(Yong-Chae Bae),함지웅(ji-woong Ham),이동원(Dong-Woen Lee) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
A plants generator system under operating condition has been suffered the vibration from the excitation force with 120Hz. The vibration is generated in the stator end windings. For analyze dynamic characteristics of the generators stator, its finite element model were obtained using ANSYS software package for modal and harmonic analysis. we compare the analysis result with experimental data. The results show that the resonance frequency, which is related with second ecliptical mode on the stator end windings 129Hz. The experimental results are good agreement with the FEA model.
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안창기(Chang gi Ahn),유제용(Je Yong Yu),박진석(Jin Seok Park),함지웅(Ji Woong Ham) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
RCP(Reactor coolant pump) must be designed to preserve its functions on normal or abnormal environments and seismic event same as operating basis earthquake(OBE) and safe shutdown earthquake(SSE). Generally, there are static and dynamic analytical method which can be applied by a floor response spectrum or time history analysis for the seismic qualification. Initially, It was accomplished a detailed structural FE-model for finite element analysis on the bases of 3-dimensional solid model which was made by the RCP drawing. As the result of dynamic characteristic using the detailed FE-model, its shown about 12Hz natural frequency of 1st bending mode shape and maximum displacement has 11mm with the structural bending by single-point response spectrum(SPRS) method at all elevation. But maximum displacement has 7.6mm by multi-point response spectrum(MPRS) method which was applied to the three floor response spectrum at each elevation. Therefore, On a large heighten structures as RCP, The application by SPRS method causes to be more conservative results. Finally, A simpled equivalent beam model which was developed by use of iteration of detailed FE-model is shown the result more similar with those of natural frequencies and SPRS analysis. And maximum equivalent stress and displacement of the simpled beam has verified with 180MPa and 7.1mm each at 15sec as results by SSE time history method.
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박진호(Jin-Ho Park),이정한(Jeong-Han Lee),김봉수(Bong-Soo Kim),안창기(Chang-Gi Ahn),강문후(Mun-Hu Kang),주윤식(Yoon-Sik Joo) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Recently, mixers are being widely used in the water purification plant in order to increase the filtration efficiency. The mixer normally consists of impeller, shaft, hub, reduction gear, and the driving motor. It is one of the key design issues to confirm that the vibration caused by the rotation of the shaft should not coincide with the natural vibration frequency of the shaft itself. The vibration characteristics of the hydrofoil type mixer, which is the most widely used in real plants are evaluated through the finite element modeling and verified by experiment using the mock-up facility. The fundamental natural frequency of the mixer's shaft is found to be around 1.8 ㎐ which showed in good agreement with the experiment. The higher natural frequencies to the 2nd, 3rd, and 4th modes are also verified by the experiment. Thus the developed model is to be utilized for the structural design of the real mixer system.
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진재훈(Jae Hoon Jin),정사무엘(Samuel Jung),김태윤(Tae Yoon Kim),김영구(Young Ku Kim),안창기(Chang Gi Ahn),유완석(Wan Suk Yoo) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.2
본 연구에서는 자주박격포의 다물체동역학 모델을 만든 뒤, 포탄의 탄도학을 고려하여 시뮬레이션 하였다. 자주박격포 모델은 박격포 모델 및 차량 모델로 구성하였으며, 상용 다물체 해석 프로그램인 RecurDyn 을 사용하였다. 차량 모델은 6 자유도 강체플랫폼으로 모델링 하였으며, 박격포 발사 직후의 움직임에는 강내탄도학을 적용하였다. 강내탄도학 해석의 결과를 바탕으로, 포신을 떠난 후의 강외탄도 해석을 수행하였다. 몬테카를로 기법을 활용한 반복 해석으로 발사각과 차량 동특성에 의한 변동이 고려된 탄착점의 분산도를 구하여 사격정확도를 제시하였다. For this research, the trajectory of a projectile was simulated via the multibody dynamics analysis of a selfpropelled mortar. The dynamic model was composed of a mortar model and a vehicle model, and was simulated using the RecurDyn program. Interior ballistic was applied to the mortar model, and exterior ballistic was conducted by Matlab using the simulation results of the interior trajectory. Through repetitive Monte-Carlo simulations, the accuracy of the mortar was analyzed by considering variations in the aiming angle and vehicle dynamic response.
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굴삭기 경량화를 위한 고강도 강판 적용 부재의 치수최적설계
장정호(Jung-Ho Jang),송정한(Jung-Han Song),이근안(Geun-An Lee),이혜진(Hye-Jin Lee),석정호(Jung-Ho Seok),안창기(Chang-Gi Ahn),김세호(Se-Ho Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An attachment part of an excavator consists of boom, arm and bucket. Because these weight make a massive impact on the upper and lower structure, these parts of the structure should be optimized properly for the light weight design of an excavator. In this paper, for this reason, the optimization of an excavator boom was performed; the weight as objective function, the thickness of the boom plate as design variables and the stress of the structure as constraints. About five kinds of operation mode of an excavator existing models and advanced high strength steel plate models have compared the results of the optimization. Optimization results, the mass of existing models 12.5% and advanced high strength steel plate models 14% was reduced.
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