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음향시뮬레이션을 이용한 대형 실내체육관의 건축음향성능 개선에 관한 연구
윤재현,김재수,Yun, Jae-Hyun,Kim, Jae-Soo 한국주거학회 2008 한국주거학회 논문집 Vol.19 No.4
In this study, an analysis is carried out on the acoustic design for an indoor gymnasium scheduled to be built at Buan County, Chonbuk Province. By way of background, the study examines the case of a large-scale indoor gymnasium that has been constructed in the local area of Hangan-myeon. There are many examples whereby this gymnasium could be used not only as a sporting facility for the residents, but also as a multipurpose space for public performances such as leisure activities, lectures, assembling activities, theatre and concerts etc. In order to maximize the functional utilization of such an indoor gymnasium, it is important to simultaneously verify the acoustic capabilities of the space in terms of Definition of both Voice and Music. However, as a large-scaled athletic facility, the building was designed with a high ceiling-height to accommodate its functional characteristics. The space forms a Sound Focus whereby the sound is concentrated at a specific part, and because the vibration of sound is too loud due to its broad volume, acoustic defects arise such as a significant number of Echoes. Using this gymnasium as a precedent, this study proposes an acoustic design based on the drawings of the indoor gymnasium that is scheduled to be built at B County, Chonbuk Province. The gymnasium is equipped with an optimized acoustic condition passing through the Acoustic Simulation Phase. From the results of an Acoustic Simulation, we can design an indoor gymnasium that is equipped with a considerably satisfying and improved acoustic performance compared with the building before it was reformed. It is also considered that the use of such materials can fundamentally reduce construction costs and can improve acoustic performance, at the planning and design stages for similar sporting facilities in the future.
윤재현(Yun, Jae-Hyun),김재수(Kim, Jae-Soo) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.8
In case of the working machine that using in the loud-noisy workplace, as it generates the loud-noise, it is influencing a physical, mental bad effect to those workers. Accordingly, though the noise countermeasure for the loud-noisy workplace is acutely requiring, until now, those methods that wearing the soundproof-protection tool, or restriction the working hours, and minimize the noise exposure volume, were mainly used. However, such noise countermeasures occur many problem points. On such point of view, using the acoustic simulation technique, let the workers to choose the workplace where suffering many damages due to the noise of working machine, and after grasp the physical property of working machine and indoor acoustic characteristic, this Study has attempted to grasp the reduction degree of noise level at before-improvement?after-improvement, through the sound-absorption measure. Passing through such preceding step, using auralizational technique based on the noise of working machine of before-improvement after-improvement, and by conduct psycho-acoustics evaluation, this study intended to investigate the change degree of subject reaction. As the result of evaluation, it is considering that the noise-reduction countermeasure method for the loud-noisy workplace could be much effective, through the sound-absorption measure.
可聽化를 利用한 Y 文藝會館 室內體育館의 音響 性能評價에 關한 硏究
윤재현(Yun Jae-Hyun),최둘(Choi Dool),김재수(Kim Jae-Soo) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)
In case of Indoor Gymnasium, although its main purpose was sporting activity in the past, in recent days there are many cases that used as the multipurpose space where various public-performances are available such as resident's leisure activity, lecture and assembly activity, drama and concert. Accordingly, in order to maximum utilize the function of such Indoor Gymnasium, it is simultaneously required the Acoustic Performance with regard to the Definition of Voice and Music. However, in case of the gymnastic facility, since it has been designed as the higher ceiling-height for the sake of its characteristics, it forms a focus of tone and also the sound is concentrating to the specific part, and due to its large volume and the finishing material which has a strong reflexibility, and as the vibration of sound is too loud, it becomes to generate the acoustic defect such as many reverberations. On such viewpoint, based on the improvement device for the optimized architectural acoustic design presented by the preceded study, this Study has attempted to inquire into the Acoustic Satisfaction-Degree and its Response about the subject space, by conducting an Auralizational Experiment where possible to experience directly the Sound Field from the planning stage to its completion. As result of the investigation, at "After Improvement" comparing with "Before Improvement", the purpose of the sports facility together with its function as a multipurpose space with possibility of various public performances have been evaluated as suitable. It is considering that such material would be utilized as the fundamental material at the planning and designing stage of the similar sports facility hereafter, and it could be utilized as the useful material for the reduction effect of construction cost and enables us to improve the Acoustic Performance.
무인비행체 블레이드 형상 변화에 따른 단일로터의 제자리 비행 추력성능 분석
윤재현(Jae Hyun Yun),최하영(Ha-Young Choi),이종수(Jongsoo Lee) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.5
무인비행체는 소형화, 경량화가 중요하기 때문에 동력장치에 한계가 있다. 공력성능을 향상을 위해 항공기의 크기나 무게에 영향을 주지 않는 블레이드의 형상의 변화를 주는 것이 가장 효율적이다. 본 연구에서는 제자리 비행을 하는 멀티로터 무인비행체에 있어 단일 로터 블레이드의 테이퍼 비율, 비틀림 각도 등에 따른 추력성능의 변화를 전산유동해석 시뮬레이션을 통해 수행하였다. 전산유동해석 코드인 ADINA-CFD 를 통해 얻은 수치 결과를 깃 요소 이론(blade element theory, BET)과 비교하였으며, 블레이드의 형상 변화가 추력성능에 영향을 미치는 것을 확인하였다. An unmanned aerial vehicle (UAV) should be designed to be as small and lightweight as possible to optimize the efficiency of changing the blade shape to enhance the aerodynamic performance, such as the thrust and power. In this study, a computational fluid dynamics (CFD) simulation of an unmanned multi-rotor aerial vehicle in hover mode was performed to explore the thrust performance in terms of the blade rotational speed and blade shape parameters (i.e., taper ratio and twist angle). The commercial ADINA-CFD program was used to generate the CFD data, and the results were compared with those obtained from blade element theory (BET). The results showed that changes in the blade shape clearly affect the aerodynamic thrust of a UAV rotor blade.