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Retirement For Cause 개념에 의한 가스터빈 디스크 수명의 평가
남승훈,박종화,김종엽,Nam, Seung-Hun,Park, Jong-Hwa,Kim, Jong-Yeop 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.2
For gas turbine engines, the safe life methodology has historically been used fur fatigue life management of failure critical engine components. The safe retirement limit is necessarily determined by a conservative life evaluation procedure, thereby many components which have a long residual life are discarded. The objective of this study is to introduce the damage tolerant design concept into the life management for aircraft engine component instead of conservative fatigue life methodology which has been used for both design and maintenance. Crack growth data were collected on a nickel base superalloy which have been subjected to combined static and cyclic loading at elevated temperatures. Stress analysis fur turbine disk was carried out. The program for computing creep-fatigue crack growth was developed. The residual lifes of turbine disk component under various temperatures and conditions using creep-fatigue crack growth data were estimated. As the result of analysis, it was confirmed that retirement fur cause concept was applicable to the evaluation of residual life of retired turbine disk which had been designed based on the conventional fatigue life methodology.
열화된 1Cr-1Mo-0.25V강의 DBTT 크기효과 보정에 관한 연구
남승훈,김엄기,이대열,Nam, Seung-Hun,Kim, Eom-Gi,Lee, Dae-Yeol 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.12
Miniaturized specimen technology is useful to characterize the mechanical behavior when it is difficult to sample the material enough for the test. In this study, two kinds of miniaturized Charpy impact specimens(i.e., miniaturized specimen with side groove and without side groove) of aged 1Cr- lMo-0.25V steel were prepared and tested. The relationship between the extent of degradation in terms of ductile brittle transition temperature(DBTT) and the fracture stress of 1Cr-1Mo-0.25V steel was established. The fracture stress obtained from miniaturized specimen without side groove turned out to be linearly related with the DBTT of standard specimen. Therefore the fracture toughness of aged turbine rotor steel might be evaluated by the fracture stress. In addition, the correlation between DBTT of standard specimen and that of miniaturized specimen was investigated. As the results of normalizing DBTT by maximum elastic tensile stress, the normalized DBTT of miniaturized specimen without side groove allows one to estimate that of standard specimen.
남승훈(Seung Hoon, Nam),김재수(Jae-Soo, Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
University performance halls, which are still recognized as spaces only for lectures and events, are provided with very short reverberation time and have defects corrected with electric sound in building and remodeling. So the complaint has been made that they may have difficulty in allowing audience to appreciate music with a mellow sound due to insufficient reverberation for performances, including concerts. In addition, poor satisfaction with subjective acoustic performance in audience, despite the improvement in physical acoustic performance, following remodeling causes dissatisfaction. From this perspective, this study aimed to examine the changes in subjective satisfaction with the improvement in acoustic performance through auralization test on the basis of the field measurements of the performance hall in W University, which has recently been remodeled according to the data from the previous research, and the simulation data with improved acoustic performance appropriate for a multi-purpose hall.
남승훈(Nam Seung Hoon),김재수(Kim Jae-Soo) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Korean traditional classical music is the type of music unique to Korea, which differs from Western music. However, pansori or other types of Korean traditional classical music have been performed in multipurpose halls or concert halls, which are based on performance of Western music, and the need for performance halls appropriate for Korean traditional classical music performance has been suggested. In addition, the failure to conduct systematic research on the acoustic characteristics of Korean traditional classical music performance halls has led to lots of difficulties with design, construction, and remodeling of the halls. From this perspective, this study aimed to measure and analyze the characteristics of the rapid speech transmission index and definition in six Korean traditional classical music performance halls. The data are expected to be useful to fully reflect the characteristic of "definition" of sound appropriate for the Korean situation in building a Korean traditional classical music performance hall.
체적에 따른 국악 공연장의 잔향시간 분포 및 상관성 분석
남승훈(Nam Seung Hoon),김재수(Kim Jae-Soo) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Korean traditional music is a unique type of music that exists only in Korea unlike Western music. As Pansori and Korean traditional music have been performed in multi-purpose halls and concert halls, which are venues designed mainly for Western music, the need for venues that are appropriate for Korean traditional music performance has been pointed out. In addition, this area involves a lot of challenges since there have yet to be systematic researches on reverberation time that is ideal for Korean traditional music halls. In this regard, the present study compares the reverberation time proposed in the preliminary study with that proposed by Knudsen-Harris in order to grasp the range of reverberation time. Based on the result, the correlation between reverberation time and volume depending on the frequency is analyzed additionally. It is expected that the findings will be useful in specifying the range of optimum reverberation time for Korean traditional music halls that are suitable for the domestic condition.
남승훈 ( Seung Hoon Nam ),류창수 ( Chang Su Ryu ),임태규 ( Tae Gyu Yim ),송윤선 ( Yoon Seon Song ) 한국감성과학회 2002 추계학술대회 Vol.2002 No.-
컴퓨터의 발달과 더불어 인간과 컴퓨터 인터페이스에 있어서도 많은 발전을 하고 있다. 본 연구는 두뇌-컴퓨터 인터페이스(brain-computer interface : BCI)를 위해서 인간에 있어서 가장 간단한 의사문제라고 여겨지는 긍정이나 부정을 선택할 때 나타나는 뇌파를 AR 모델을 이용하여 시간-주파수 분석을 한 후 topographical map을 그렸다. 그 결과 문제에 대답하는 시점 전후에서 파워스펙트럼이 유사하였고, 피험자가 문제를 읽고 판단하고, 동작하는 시점(reaction time : RT) 전으로 1초 ~ 0.5초 사이에 전두엽과 두정엽 부위에서 16Hz ~ 24Hz, 80 ∼ 88Hz의 주파수 대역에서 유의미한 차이를 보였다.
남승훈(Nam Seung Hoon),김재수(Kim Jae-Soo) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
With the recent rise in the cultural level, each region requires small-sized cultural and practice spaces, which are absolutely insufficient. Moreover, spaces within various buildings, which are managed by local governments, have been unused and neglected. So the government tries to make greater use of idle public facilities, which have been neglected, aged, for years, and provide stable practice spaces in support of creative activities by local arts groups. The development of such idle public facilities into performing arts practice spaces requires security of data concerning acoustic performance before remodeling at the stage of design; however, it is impossible to measure or evaluate their acoustic performance before remodeling because they have long been neglected and unmanaged. From this perspective, this study aimed to use acoustic simulation to determine acoustic performance in Hanpac Practice Room. The data from this study are expected to be useful in acoustic design and remodeling of similar spaces.