• Title, Summary, Keyword: 소음예측프로그램

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Pattern Noise Prediction for Passenger Car Tire (승용차용 타이어 패턴에 따른 소음 예측 기법)

  • 이승훈
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.39-39
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    • 1987
  • 자동차에서 발생되는 소음은 여러 가지 발생원으로부터의 복합적인 것으로서 차량의 속도가 고속화하면서 타이어 소음의 기여도가 매우 커지는 것으로 알려져 있다. 타이어 소음은 근본적으로 노면과 타이어의 상호작용에 의하여 발생되는 데 타이어/노면의 상호작용에 영향을 미치는 인자로는 마모상태, 차량속도, 하중, 공기압, carcass 구조, 타이어 온도등 여러 가지가 있으나 tread 모양과 노면의 상태에 가장 크게 영향을 받는다. 본 연구에서는 승용차용 155SR13 radial 타이어를 대상으로 하여 실내에 설치된 dynamometer를 이용하여 groove 의 개수, groove 길이, groove 폭, groove 깊이, groove 방향 등 트레드 패턴 인자가 발생소음에 미치는 기여도를 실험적으로 측정하고 트레드 패턴형상에 따른 소음도를 예측할 수 있는 실험식을 구했다. 또한 단일 groove 내에서 발생되는 소음의 시간신호를 측정하여 모델화하고 차량속도와 groove 사이의 간격에 따른 시간신호를 합성하고 이 신호로부터 FFT 알고리듬을 통해 소음 spectrum을 구하는 소음 예측 프로그램을 개발하였다. 비교적 단순한 tread 패턴에 대해 이를 적용한 결과 실험적으로 구한 spectrum과 상당히 유사함을 볼 수 있었다.

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A Study on Noise Reduction of Quiet Pavement through the Noise Level Prediction and the Economic Analysis (저소음 포장의 소음예측 및 경제성 분석을 통한 소음 저감방안)

  • Jo, Shin Haeng;Jang, Jung Soon;Kim, Wan Sang;Kim, Nakseok
    • Journal of The Korean Society of Civil Engineers
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    • v.33 no.3
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    • pp.1143-1151
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    • 2013
  • Reasonable methods are needed to predict the noise level of new/existing roads and to select means of noise reduction. In this study, the noise reduction effects of both soundproof walls and quiet pavements were predicted. The noise reduction effects of quiet pavements were predicted by measurement data obtained using the CPX method in test pavements. The noise reduction effect was predicted by KHTN program when applied to soundproof walls and quiet pavement. As a result, the predicted noise level was similar to the measured one. The design method was suggested by an economic analysis using noise benefit of predicted noise reduction. The research suggests that the optimum alternative has to be determined using noise prediction method and life-cycle cost analysis.

Development of the Simple Prediction Program to Prevent Construction Noise in Site (건설소음 예방을 위한 현장용 간이 합성소음 예측프로그램 개발)

  • Bang, Jong-Dae;Song, Hee-Soo;Gyeong, Tae-Ug;Lim, Byung-Gun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.59-65
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    • 2005
  • The research is an objective which prevents a construction noise by developing prediction program on utility, helps comprehension of construction noise by case study. The program developed with Visual Basic of the Excel Logic. The standard noise is a data with report of the construction machine (National Institute of Environmental Research), construction noise of sound pressure level applied the distance decrease of the point source. The decrease effect of the barrier noise wall used the data of 5, 10, 15, 20dB where the diffraction is reflected. used a program, case study is suggested Prevention method to prevent noise of construction site.

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Tailpipe Noise Prediction of an Accelerating Vehicle (가속주행하는 차량의 배기 토출 소음 예측)

  • Kim Bong-Ki
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.291-294
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    • 2000
  • Analysis of the contribution of each pass-by noise source to the overall pass-by noise is an important issue for reduction of pass-by noise. A technical approach for predicting tailpipe noise is used to identify the contribution of tailpipe noise to the pass-by noise in this study. Simulation program with a time domain engine modeling program called 'WAVE' and wave propagation theory of moving noise source are employed. Since the Doppler phenomenon causes a frequency shift during a pass-by noise test, the Doppler correction and time delay effects are incorporated into the estimation of tailpipe noise. The developed program can furnish an in-depth understanding of the effect of tailpipe to pass-by noise.

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Aerodynamic Noise Prediction of a Helicopter Rotor Blade for the Flight Conditions of Approach and Flyover (비행 조건 별 헬리콥터 로터 블레이드 공력 소음 예측)

  • Wie, Seong-Yong;Kang, Hee Jung;Kim, Deog-Kwan
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.8
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    • pp.671-678
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    • 2018
  • Helicopter noise prediction is an essential process for developing low noise helicopter technology. In this paper, the noise prediction method is developed using the helicopter integrated performance analysis program CAMRAD-II and in-house noise analysis code. In addition, the analytical technique was verified by analyzing blade-vortex interaction noise, which is the biggest cause of helicopter noise. In order to predict the actual helicopter noise, the noise analysis was performed for the flyover and approach condition, which is the standard measurement condition of the International Civil Aviation Organization (ICAO). Finally, we confirmed the suitability of the analytical method through comparison and analysis with the flight test results.

A Study on the Computer Program for the Shipboard Noise Prediction - using Statistical Energy Analysis - (선박 소음 예측 전산 프로그램의 개발에 관한 연구 -통계적 에너지 해석법을 이용한-)

  • Sa-Soo Kim;Ku-Kyun Shin;Hong-Gi Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.28 no.2
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    • pp.293-306
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    • 1991
  • During the last few years recommendations or regulations concerning permissible noise levels on shirts have been issued by the authorities in most countries. For these reasons the need for useful and accurate noise prediction computer programs has been emphasized. A noise prediction program can make it possible to find the most economical solution to achieve a certain noise requirement. This paper attempts to develop a noise prediction computer program using statistical energy analysis(SEA). In this paper, the SEA is used to predict the sound transmission loss for airborne noise and the vibration amplitude of the panel consisting of ship spaces such as floor, wall, and ceiling for structureborne noise. And in order to verify the prediction, a small passenger vessel, G/T120 tons, is selected. It has been shown that the prediction is capable of giving results in good practical agreement with measurements and therefore it is useful for predicting the nolle levels in ships and establishing the countermeasures at early design stage.

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Prediction of Environmental Noise using Contour Map (등고선 입력을 사용한 환경 소음 예측)

  • 박지헌;김정태
    • Proceedings of the Korean Information Science Society Conference
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    • pp.547-549
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    • 2002
  • 본 논문은 등고선을 이용한 입력된 지표면에 대하여, 소음 영향을 계산하는 프로그램 개발에 관한 것이다. 기존의 등고선 입력 방법을 구현하여 삼차원 지표면 입력을 받으며, 이것이 주위 환경의 일부이다. 삼차원 지표면 입력에 대하여, 국부에 대한 소음 영향을 예측하기 위하여, 지표면을 표현하는 다각형을 작은 삼각형으로 분리되며, 각 작은 삼각형에는 수음자들이 존재한다. 소음 원은 도로, 철도 등 다양하며, 소리가 퍼져나가는 근원이며, 모두 점 음원으로 간주된다. 지표면을 분리된 삼각형에 대하여 기하학 적인 방법을 사용하여 소음 전파 시뮬레이션이 이루어진다. 등고선 입력 방범은 저렴한 삼차원 지표면 입력 방범이며, 사용된 기하학 적인 소음 전파 영향 계산법은 제산 시간을 줄이면서 효율적으로 소음 영향을 예측할수 있게 해 준다.

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케이싱을 고려한 홴의 유동 및 소음해석 프로그램 응용

  • 이덕주;전완호;정기훈
    • Journal of KSNVE
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    • v.11 no.1
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    • pp.5-14
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    • 2001
  • 송풍기나 홴과 같은 유체기계의 소음은 최근 들어 사람들의 관심을 끌면서 많은 사회적 문제가 되고 있다. 이러한 문제는 유체기계가 제품의 구매요구를 결정할 뿐만 아니라 환경소음의 규제와도 관계가 깊다. 이런 홴이나 송풍기 소음은 축 편심에 의한 진동 소음과, 유동에 의한 유동소음이 있는데 대형 송풍기는 진동 소음과 유동 소음이 동시에 존재하지만 중소형 송풍기는 유동 소음이 우세하다. 유동 소음은 공력음향학이라는 학문의 한 분야로 유동에 대한 정보가 있어야 정확한 소음원을 파악하고, 특성도 예측이 가능하다. 유동과의 강한 연관성 때문에 지금까지 송풍기의 유동 소음에 대한 연구가 미약하였다.(중략)

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Development of the Noise Prediction Program to apply in Construction Site (현장 적용성을 향상시킨 건설현장 소음예측프로그램 개발)

  • Oh, Jin-Kyun;Park, Hye-Na;Sohn, Jang-Ryul
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.4
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    • pp.409-417
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    • 2009
  • Nowadays, the construction sites are growing in city every year, so complaints for construction noise have increased more and more. To analyze this noise scientifically, construction noise prediction program was developed in 1998 and 2005 but it is too difficult to apply program in field because there is few soundproof facilities and it can't understand the coordinate system and so on. The aim of this study is to develop noise prediction program to apply in construction sites. For this, the problems of existing program was analyzed and survey was performed to get requestion of field overseer and upgraded program. To get reliability of program, it was compared with sound measurement value in field. As a result, construction sound prediction program have various soundproof facilities data than existing program. It can also analyze multi receiver point at the same time for several construction machinery. Most of all, it is more powerful to set receiver or source in the axis of X, Y, Z. so program user can make use of it easily. An average of difference is -0.9~1.8 dB.

Development of the Noise Prediction Program to apply in Construction Site (현장 적용성을 향상시킨 건설현장 소음예측프로그램 개발)

  • Oh, Jin-Kyun;Park, Hye-Na;Sohn, Jang-Ryul
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.302-309
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    • 2009
  • Nowadays, the construction sites are growing in city every year, so complaints for construction noise have increased more and more. To analyze this noise scientifically, construction noise prediction program was developed in 1998 and 2005 but it is too difficult to apply program in field because there is few soundproof facilities and it can't understand the coordinate system and so on. The aim of this study is to develop noise prediction program to apply in construction sites. For this, the problems of existing program was analyzed and survey was performed to get requestion of field overseer and upgraded program. To get reliability of program, it was compared with sound measurement value in field. As a result, construction sound prediction program have various soundproof facilities data than existing program. It can also analyze multi receiver point at the same time for several construction machinery. Most of all, it is more powerful to set receiver or source in the axis of X, Y, Z. so program user can make use of it easily. An average of difference is -0.9$\sim$1.8dB.

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