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고속철도 소음의 불쾌감에 영향을 미치는 음질인자 분석 및 예측
성열완,Seong, Yeolwan 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.12
As the demand for high-speed railways increases, noise damage is also expected to increase due to geological conditions. Therefore, various noise reduction technologies are being developed to prevent such damage. The current criteria for the effectiveness of technologies are defined by physical parameters; however, other acoustic characteristics also affect the psychological response induced by noise. This study shows that there is similarity between the specific loudness patterns in the critical band from four types of high-speed railway noise. In the jury test, the new sound quality factor based on the specific loudness level of a certain band showed a stronger correlation to the annoyance response than loudness in the noise conditions, where the correlation between loudness and annoyance is low. Therefore, multiple regression analysis with loudness showed that the combination of the two factors could predict the annoyance response of high-speed railways. 고속철도의 수요가 증가함에 따라 지질학적 여건상 소음 피해의 확대가 예상되는 가운데 이를 예방하기 위해 다양한 저소음화 기술 및 제도적 장치들이 마련 중에 있다. 현재 철도 소음의 위해성을 판단할 수 있는 지표는 규정에서도 음압레벨 등 소음의 물리적 크기만을 기준으로 삼고 있지만 실제로 소음에 의한 감성반응은 크기 이외의 음향학적 요인에도 영향을 받는다는 사실을 다른 연구 결과에서도 찾아볼 수 있다. 본 연구에서는 현장에서 녹취한 4종의 고속철도 소음에 대해 임계대역에서의 비라우드니스 레벨을 그려보았고 그 결과 비라우드니스 패턴 간의 유사성을 확인하였다. 그리고 청감실험을 통해 라우드니스와 불쾌감의 상관성이 낮은 소음 조건에서는 라우드니스보다 특정 대역의 비라우드니스 크기 차이에 근거한 새 음질인자가 불쾌감 반응과 높은 상관성을 갖는 것을 확인하였다. 더불어 새 음질인자와 라우드니스의 다중회귀분석을 통해 두 인자를 조합한 회귀식이 고속철도 소음의 불쾌감 반응을 예측할 수 있음을 검증하였다.
철도소음 분석방법 및 불쾌감 평가에 적합한 라우드니스 모델 비교
성열완(Yeolwan Seong),곽두영(Doo Young Gwak),홍지영(Jiyoung Hong),이수갑(Soogab Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
It is certain that the measurement and analysis of noise are the most important issue in assessing the impact of noise on people. In previous study, it was identified that the response in frequency domain is different between a binaural signal measured by dummy head signal and a monaural signal and it is resulted form physical phenomena such as diffraction and refraction. Also, the loudness is known for an appropriate index in evaluating the sound quality and is standardization for steady sounds. In the present study, railway noise was recorded using dummy head on the basis of binaural effect and those signals’ specific loudness on critical-band rate were calculated and compared with frequency analysis. In addition, a statistical analysis by linear regression model was conducted to get the correlation between subjective annoyance and loudness models. As a result, the Zwicker’s loudness(ISO532) showed significance level with railway noise higher than time-varying loudness model.
출력피드백에 의한 비매칭 불확실성이 있는 비선형계의 제어
박창용,성열완,권오규,Park, Chang-Yong,Sung, Yul-Wan,Kwon, Oh-Kyu 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
In this paper, we design output feedback nonlinear dynamic control law by using state feedback nonlinear dynamic compensator and PI observer and show that the controller can stabilize globally and asymptotically a class of nonlinear systems with mismatched uncertainties. We also show that it is possible for a nonlinear system to use the output of PI observer in place of state variables in case that the nonlinear dynamic control law is used, similarly as in the linear system. The effectiveness of the proposed control law is demonstrated by a numerical simulation.
비 매칭 불확실성이 있는 비선형시스템의 균일 종국적 유계성 및 대역적 점근 안정성
장충환,성열완,이건일 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.7
In this paper we propose a control law using a Lyapunov-like function that makes stable the systems which have mis-matched uncertainties. The existing control law using a Lyapunov-like function, which gives global saymptotic stability, is designed under the assumption of a targetsystem to be stable locally. But we broaden here the class of target systems by designing the control law which can give uniform ultimate boundedness to even the systems not satisfing the locally asymptotic stability. And we also show that the control law giving global asymptotic stability can be designed more systematically through using the uniform ultimate boundedness.