• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2007년도 추계학술대회논문집
• /
• pp.6-11
• /
• 2007

Packaged power station (PPS) is a stationary diesel engine generator set and developed for the supply of electric power to small villages, islands and factories etc. Therefore, the PPS is closely installed to residence area and sometimes cause the environmental noise problems. In this paper, environmental noise analysis was performed for the power plant with 28 sets of PPS. The initial analysis results showed the some difference between the measurement and analysis because of the inaccurate noise source data. To improve the accuracy of analysis, main noise sources were inversely estimated using the in-situ measurement data in the vicinity of PPS and steam boiler. As the results of re-analysis, the good agreement was obtained and it was concluded that the noise levels exceed the specified noise limit in residence area. In order to reduce the noise, the several methods such as geometry alteration of inlet duct, application of hybrid-type silencer and noise protection barrier were suggested and verified with the confirmed analysis model.

• 대한전기학회논문지:전력기술부문A
• /
• 제51권1호
• /
• pp.23-28
• /
• 2002

In order to survey the radiation characteristics of pure line noise of unwanted noise from overhead high voltage AC transmission lines, a disk type gap noise generator was manufactured. Disk size which decides capacitance between the noise generator and earth was selected through preliminary indoor experiments and analysis by using surface charge method. The capacitance is one of principal parameters related to the injection of a proper noise current into lines. On the basis of the capacitance obtained from calculation, 5mm of space was given to the gap of the noise generator to be installed o test line and an aluminum disk of 60cm radius was made. The field experiments were performed with the noise generator hung on the Kochang 765 kV full scale test line. As the results, the useful data which can be used to analysis the radiation characteristics of noise from transmission lines were obtained. Those are the directivity of antenna toward the line, lateral profiles, frequency spectra, height pattern and so on.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
• /
• pp.1360-1363
• /
• 1997

Development and realizatioin of adaptive Active Noise Cntrol used for quieting transformer nosie are planed to provide workers with comfortable working environment and to attenuate the noise for residents in many noisy areas(power plant, power transformer, GIS transformer etc.).

• 조명전기설비학회논문지
• /
• 제23권8호
• /
• pp.110-115
• /
• 2009

최근 생활수준의 향상과 세계적인 녹색성장 정책으로 환경에 대한 관심이 고조되어, 전력분야에서도 환경친화적인 설비가 요구되어 지고 있다. 이에 따라 전력용 변압기 냉각팬도 날개형상과 배치형태를 개선한 저소음 냉각팬이 개발되었으며, 일반 전력용 변압기 및 저소음 변압기에 적용될 예정이다. 냉각팬은 낮은 소음레벨 뿐만 아니라 우수한 냉각성능의 확보가 필수적이다. 그러나 현재까지 저소음 냉각팬의 소음레벨과 냉각성능에 대한 검토가 이루어지지 않은 실정이다. 따라서 본 논문에서는 소음레벨 측정과 풍량 측정 실험을 통해 저소음 냉각팬의 성능을 분석하였다. 또한 저소음 냉각팬을 적용한 전력용 변압기의 온도상승 시험을 통하여 냉각성능을 검증하였다.

• 환경영향평가
• /
• 제32권5호
• /
• pp.279-290
• /
• 2023

최근 신재생에너지로서 바람의 힘을 이용한 풍력발전단지가 전국에 설치되면서 소음 문제가 대두되고 있다. 환경영향평가 및 사후환경영향평가에서도 풍력발전단지에 대한 배경소음 및 저주파소음을 측정하도록 하고 있으며, 특히 저주파소음은 환경부에서 2018년 공표한 저주파소음 관리 가이드라인에 따라 생활소음 측정방법을 준용하여 측정하도록 규정하고 있다. 고풍속에서 큰 소음을 발생시키는 풍력발전기의 특성상 고풍속에서 소음 측정이 이루어져야 하나 풍속이 증가할 경우 풍잡음이 증가하여 생활소음 및 저주파소음이 제대로 평가되지 못하는 문제가 발생되었다. 따라서 풍력발전기에서 발생되는 소음의 종류를 확인하고 풍잡음 등 풍력소음 측정시 고려되어야 할 사항을 확인하였다.

• 한국소음진동공학회논문집
• /
• 제20권2호
• /
• pp.160-165
• /
• 2010

As the various industrial machinery has come into being by development of industrial technology, the productivity of the basic industrial machinery has improved. However, at the same time, noise from various industrial machinery disturbs the quiet environment. There are 35 kinds of the noise emission machinery defined in the noise and vibration control act according to the horse power and the number of machinery. These were classified in 1992, and the characteristics of the noise emission machinery may be different from the past one. So we need to investigate the characteristics of the noise emitted by machinery to control it rightly. We measured sound intensity of 32 noise emission machinery to calculate the sound power levels of those and investigated the characteristics of the sound power level of those according to the frequency. We found that the forging machine, concrete pipe and pile making machine, sawing machine, etc. are noisy. The generator, the concrete pipe and pile making machine, etc. emit the low frequency noise, but the molding machine, the stone cutter, the metal cutter, etc. emit the high frequency noise.

• 한국전자파학회지:전자파기술
• /
• 제2권1호
• /
• pp.55-62
• /
• 1991

본 논문에서는 전도성 잡음의 형태로 전파되는 건물내 전력선 상의 잡음 종류와 분포 특성을 살펴 보았으며, 세가지 방법으로 나누어 현장 시험을 수행하고 그 결과를 분석하였다. 측정 결과를 보면, 전 주파수 대에 걸쳐 존재하는 랜덤 잡음 외에도 60Hz 전원 주파수와 동기되어 나타나는 고주파 잡음 및 TV, 모터 등에 의한 임펄수 잡음 등이 건물내 전력선 전도 잡음의 주류를 이루고 있다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2007년도 춘계학술대회논문집
• /
• pp.489-493
• /
• 2007

Mmulti-domain noise analysis method using Power Flow Boundary Element Method(PFBEM) has been developed successfully. Some applications are introduced. several examples. PFBEM is a numerical analysis method formulated by applying Boundary Element Method(BEM) to Power Flow Analysis(PFA). PFBEM is very powerful in predicting noise level in medium-to-high frequency ranges. However there are restrictions in analyzing the coupled structures and multi-media. In this paper, an analysis method for multi-domain acoustic problems in the diverse acoustic fields is suggested. And the developed method is applied to the car interior and exterior multi-domain noise analysis.

• 한국자동차공학회논문집
• /
• 제1권2호
• /
• pp.77-88
• /
• 1993

This paper shows the methods about an improvement of the sound quality, which is improvement for automobil market recently. Especially, the rumble noise in the passenger compartment makes driver uncomfortable. For an improvement of the rumble noise, in this paper, the increase of the number of balance weight of the crank shaft(from 4 to 8), the vibration constrainer of cylinder block and the flexible flywheel were applied to power plant. Among those kinds of applications, the application of the flexible flywheel to power plant makes not only the vibration of the engine mount boss reduce most effectly but also the interior noise. It also improves the sound quality and the rumble noise disappears in the passenger compartment.

• KEPCO Journal on Electric Power and Energy
• /
• 제1권1호
• /
• pp.99-104
• /
• 2015

In this study, it has been initiated to investigate the specific abnormal vibration signal that has been captured in the power equipment. Array Microphone can be used in order to detect the direction and the position of the noise source. It is possible to track the abnormal mechanical noise in the power plant by utilizing the program and the microphone array system developed from this research. Array microphone system can be operated as a constant monitoring system.