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김호진(Hojin Kim),김중관(Joong-Kwan Kim),김준환(Junhwan Kim),김현석(Hyunsuk Kim),위혁(Hyuk Wee) 한국방재안전학회 2023 한국방재안전학회 논문집 Vol.16 No.3
본 연구에서는 능동소음제어(ANC) 기술을 층간소음 분야에 적용하기 위하여 40~500 Hz 대역의 중량충격음을 제어하기 위한 ANC 시스템을 구성하였다. ANC 시스템에는 Fx-LMS 알고리즘 기반의 적응형 필터를 활용한 피드포워드 방식의 제어기술을 도입하였다. ANC 시스템 설정을 위해 가상 시뮬레이션을 통해 ANC를 구성하는 변수 연구를 실시하였고, 이를 통해 최적 필터와 시스템 배치 방법을 정립하였다. 또한 본 연구에는 개발된 ANC 시스템을 한국건설생활시험연구원(KCL)의 층간소음 시험실에 설치한 후 표준시험방법에 따라 ANC 시스템 구동 전후 4 dB의 층간소음 저감효과를 확인하였다. 시험결과를 통해 본 연구에서 개발한 ANC 시스템이 중량충격음에 대한 등급 기준을 한 단계를 상향시킬 수 있는 수준의 효과가 있음을 확인하였다. In this study, the application of ANC (Active Noise Control) technology to address inter-floor noise was explored. To achieve this, an ANC system was developed to manage the heavy impact sound within the frequency range of 40 to 500 Hz. The ANC system utilized an adaptive filter employing a feedforward approach based on the Fx-LMS algorithm. To set up the ANC system, a comprehensive analysis of various variables within the system was performed using computational simulations. This process enabled the identification of optimal filter settings and system configuration arrangements. In addition, the ANC system was implemented in the inter-floor noise test room at the Korea Conformity Laboratories (KCL). Through a certified standard testing procedure, it was confirmed that the ANC system led to a 4 dB reduction in inter-floor noise when the system was activated compared to when it was turned off. The results of this study indicate that the developed ANC system has an effect significant enough to elevate the rating criteria by one level for heavy impact sound.
소방차 실내의 사이렌 소음 저감을 위한 능동소음제어 시스템
강종규(Jonggyu Kang),김현석(Hyounsuk Kim),주진호(Jinho Joo),김중관(Joongkwan Kim),오동호(Dongho Oh) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.11
소방차와 같은 긴급차량의 운행 시 주변 운전자와 보행자에게 경보를 알리기 위한 목적으로 사용되는 사이렌 소리는 매우 높은 음압 레벨로 차량 외부에 방사된다. 이때 차량 실내로 함께 전달되는 사이렌 소음으로 인해 소방관은 무전기, 네비게이션 등의 음성을 인식하는데 방해를 받거나 소음성 난청이 유발될 위험에 노출되게 된다. 본 연구에서는 사이렌 소음을 제거하기 위한 방안으로 능동소음제어 기법을 제안하였으며, DSP를 이용한 실시간 제어시스템을 구현하여 차량 실내 환경에서 알고리즘의 유효성과 성능을 검증하였다. 또, 사이렌 소음의 주파수 특성과 탑승자의 탑승 특성을 고려하여 정음 공간의 크기를 확장하고자 하였다. 이를 위해 다채널 오차 마이크로폰 시스템을 적용하였으며, 제어 실험의 결과를 통해 적절한 마이크로폰 간격을 도출하였다. Siren sounds of high sound pressure levels are emitted from fire vehicles to alert other drivers and/or pedestrians. These siren sounds are propagated into the vehicle cabin; this impacts the clarity of voice communication via radio, navigation, and sometimes exposed to hardness of hearing. In this study, an active noise control (ANC) system is proposed to cancel the siren noise inside the vehicle. A real-time control system is implemented using a DSP configuration; its effectiveness and noise reduction performance are verified inside a real vehicle cabin. Considering the frequency characteristics of siren noise and passenger"s boarding conditions, a multiple error-microphone system is applied to expand the zone of quiet; in addition, appropriate microphone spacing is deduced based on experimental results to expand the zone of quiet.
이유엽(Lee, You-Yub),박상길(Park, Sang-Gil),오재응(Oh, Jae-Eung) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3
This study presents the active noise control of duct noise. The duct was excited by a steady-state harmonic and white noise force and the control was performed by one control speaker attached to surface of the duct. An adaptive controller based on filtered x LMS(FXLMS) algorithm was used and controller was defined by minimizing the square of the response of the error microphone. The assemble controller, which is called a hybrid ANC(active noise control) system, was combined with feedforward and feedback controller. The feedforward ANC attenuates primary noise that is correlated with the reference signal, while the feedback ANC cancels the narrowband components of the primary noise that are not observed by the reference sensor. Furthermore, in many ANC applications, the periodic components of noise are the most intense and the feedback ANC system has the effect of reducing the spectral peaks of the primary noise, thus easing the burden of the feedforward ANC filter.
피드포워드와 피드백 알고리즘의 연성을 줄이는 새로운 하이브리드 능동소음제어 알고리즘
정익채(Ik-Chae Jeong),박영진(Young-Jin Park) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Passive noise control is simple and effective way to reduce noise. But passive noise control is not effective at low frequency. So ANC(active noise control) is used to use to solve this problem. The algorithm of ANC is mostly used FXLMS(Filtered-X LMS) algorithm. Feedforward FXLMS algorithm suffers from low correation with reference signal and noise signal. Feedback ANC algorithm suffers from causality. To complement weakness of two algorithms, hybrid ANC algorithm is used. Conventional hybrid ANC algorithm also suffers from coupling of two algorithm that can cause destabilization. So, this paper Proposes new hybrid ANC algorithm that reduces each algorithm’s destabilization.
자동차 실내소음의 능동제어를 위한 고속 이산 신호처리 장치 개발
김인수,이강모,허현무,홍석윤 한국소음진동공학회 1996 소음 진동 Vol.6 No.2
Active noise control(ANC) requires the full capability of a modern digital signal processing module. This paper describes the digital signal processing unit which is designed for ANC of noise fields in passenger car. System hardware is designed to allow software controlled versatility as well as fully qutomatic operation. The developed system is provided with the ability to be self-operated except the case of upload/download of data and program between the personal computer and the system memory. Experimental results are presented to demonstrate ANC performance of noise fields in lightly damped enclosure and passenger car.
Duct ANC System에서 부가음원 방향별 소음감소효과
이응석(Lee, Eung-Suk),이형석(Lee, Hyung-Seok) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3
In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in ANC system. Automobile exhaust noise was recorded at 800 rpm, 3500 rpm and 5000 rpm of a diesel engine. Directions of canceling speaker can be set to $30^{\circ}$, $90^{\circ}$ and $150^{\circ}$ against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board with TMS320C6416 chip of Texas Instrument Co. used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The $150^{\circ}$ duct in the attenuation effect of noise showed a better result than the $90^{\circ}$ or $30^{\circ}$ duct.