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지보재 파괴를 고려한 터널 안전율의 수치해석적 산정 연구
유광호,박연준,홍근영,이현구,김재권,You, Kwang-Ho,Park, Yeon-Jun,Hong, Keun-Young,Lee, Hyun-Koo,Kim, Jea-Kwon 한국터널지하공간학회 2005 터널기술 Vol.7 No.1
터널의 경우 지보재의 파괴가 터널의 파괴를 유발할 수 있으므로 지보재의 파괴가 고려된 안전율을 산정하는 것이 중요하다. 기존의 연구에서는 지보재의 파괴를 고려한 터널의 안전율 산정에 있어서 보 (beam)요소로 모델링하여 지보재의 파괴를 지보재에 발생하는 휨 응력과 허용응력을 비교하여 파괴를 고려하였다. 본 연구에서는 2차원 해석이 수행되었으며, 지보재를 보 (탄성)요소와 연속체 (탄소성)요소로 나누어 모델링하였고, 암반등급, 측압계수, 숏크리트 두께, 록볼트의 영향, 굴착방법이 터널의 안전율에 미치는 영향을 분석하여 적정 지보재의 모델링 방법을 제시하였다. In a tunnel, failure of its supports can cause failure of the tunnel. Therefore it is important to estimate safety factor of the tunnel which the failure of its supports is taken into account. In previous studies, supports of tunnels were usually modelled as beam elements. The failure of the supports was decided by comparing the allowable stress and the calculated bending stresses inside the beam elements in estimating safety factor of the tunnel considering the failure of its supports. In this study, it is suggested how to model the supports properly. To this end, supports of a tunnel were modelled by both beam (elastic) elements and continuum (elasto-plastic) elements in two dimensional numerical analyses. Meanwhile, it was analyzed how rock mass class, coefficient of lateral pressure, shotcrete thickness, the existence of rock bolt, and excavation method had an effect on the safety factor of a tunnel.
소음원간 누화 효과에 대한 수학적 모델 및 전달 경로 분석법 비교를 통한 검증
변재환(Byun, Jae-Hwan),김윤재(Kim, Yoon-Jae),강연준(Kang, Yeon-June),강구태(Kang, Koo-Tae),권오준(Kwon, O-Jun),홍진철(Hong, Jin-Chul) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.9
In this paper, the mathematical model on crosstalk effect between acoustic noise sources is presented. Based on this model, a theoretical value to quantitate crosstalk effect of sources can be defined on the authority of reverberation property of surrounding which sources are located, relative magnitudes of sources and phase deference between acoustic wave transferred from all of sources. In order to verify crosstalk effect factor, experiments are made for two cases, weak and strong crosstalk effect condition, by using toro representative transfer path analysis(TPA) methods.
구조-음향 상반성 원리를 이용한 공기기인 소음원의 강도 추정 및 소음 합성
김윤재(Kim, Yoon-Jae),변재환(Byun, Jae-Hwan),강연준(Kang, Yeon-June),홍진철(Hong, Jin-Chul),권오준(Kwon, O-Jun),강구태(Kang, Koo-Tae) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.1
In this paper, an alternative method was introduced to conduct a transfer path analysis for airborne noise. The method used the transfer function matrix composed of acoustic transfer functions that are referenced by the input voltage of a calibration source. A calibration factor which is converting a virtual voltage to source strength was deduced by vibro-acoustical reciprocity theorem. The calibration factor is then multiplied to the virtual input voltage to estimate the operational source strength. Three loudspeakers were used to noise sources of acrylic half car model. The method was applied to airborne noise transfer path analysis of the half car. The estimated source strength by transfer path analysis was compared the deduced source strength by vibro-acoustical reciprocity to verify the method.