• Title, Summary, Keyword: 소음예측프로그램

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A Comparison between Predicted and Measured Acoustic Characteristics of Jeonmin Catholic Church (전민동 성당의 음향 특성에 관한 모의 실험 및 측정 결과 비교)

  • Jeong Cheol-Ho;Kwon Young-Ill;Shin Sung-Hwan;Ih Jeong-Guon
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.241-244
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    • 2004
  • 전민동 성당은 얕은 팔각뿔대 형상의 지붕을 가진 팔각기둥의 형태로 재설계되었다. 팔각기둥의 형상은 마주보는 4쌍의 벽들로 인하여 공간에서 정상파가 발생하기 쉽고, 지붕 또한 둥근 형태로 음향 초점이 발생할 수 있는 등 여러가지 문제점을 가지고 있다. 이러한 형태의 전민동 성당에 대하여 여러 가지 음향 인자들을 예측하였고, 예측치와 측정치를 비교하였다. 사용된 음장해석 프로그램은 $CATT^{TM}$이고 예측 또는 측정된 음향인자는 RT, D50, C80 등이다. 건축물만의 특성과 전기음향설비가 포함된 음향특성을 비교하기 위하여, 무지향성 스피커를 이용한 측정과 성당에 장착된 전기음향장치를 이용한 측정을 수행하였다. 공연장과 마찬가지로 성당의 신도석에서도 음이 고르게 분포되는 것이 바람직하며, 신도석에서의 음압분포를 예측과 측정을 통하여 비교하여 보았다.

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SOftware for Noise Information - SONICS (건설공사장, 도로교통 및 철도소음 예측 프로그램 - SONICS)

  • 김정태;이규철;박지헌
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.747-752
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    • 1998
  • SONICS is the software developed by authors. The program provides the noise level in outdoors due to various noise source types : construction machines including blast sources, railroad vehicles and automobiles. h operates in the Windows system. Since the software is compiled by using Visual C++ 4.0, users can run the program interactively. Also SONICS uses Windows' dialog-box and choice-button so that a novice user can easily implement the program for the environmental noise planning.

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Effective Perceived Noise Level Prediction for a Propeller driven UAV by using Wind Tunnel Test Data (풍동실험결과를 이용한 프로펠러 무인 항공기의 환경인증소음 예측에 관한 연구)

  • Ryi, Jae-Ha;Rhee, Wook;Choi, Jong-Soo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.1
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    • pp.10-16
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    • 2013
  • This paper discussed a procedure for noise certification of Aircraft and predicting the full scale over-flight noise of propeller from acoustic wind tunnel measurement of small scale propeller. Noise Certification Procedures is established from International Civil Aviation Organization(ICAO). The data manipulations are then discussed in extrapolation to simulation flight distance and flight simulation. One of the most important point of flight simulation is adjustments for differences between wind tunnel test conditions and flight test conditions. To simulated the noise level estimation procedure for noise data post-process, simulate procedures from data of the wind tunnel noise measurement and the flight noise measurement by using a 7kg degree UAV. This study confirmed an effectively noise estimation procedures by wind tunnel noise test and flight noise test.

Numerical Analysis of Sunroof Buffeting using STAR-CCM+ (STAR-CCM+를 이용한 썬루프 버페팅 유동 소음 해석)

  • Bonthu, Satish Kumar;Mendonca, Fred;Kim, Ghuiyeon;Back, Young-R.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.3
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    • pp.213-218
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    • 2014
  • CFD flow simulation of vehicles with open sunroof and passenger window help the automotive OEM(original equipment manufacturer) to identify the low frequency noise levels in the cabin. The lock-in and lock-off phenomena observed in the experimental studies of sunroof buffeting is well predicted by CFD speed sweep calculations over the operating speed range of the vehicle. The trend of the shear layer oscillation frequency with vehicle speed is also well predicted. The peak SPL from the CFD calculation has a good compromise with the experimental value after incorporating the real world effects into the CFD model by means of artificial compressibility and damping correction. The entire process right from modeling to flow analysis as well as acoustic analysis has been performed within the single environment i.e., STAR-CCM+.

Software Development of the Traffic Noise Prediction Based on the Frictional Interaction between Pavement Surface and Tire (포장노면과 타이어간의 마찰음 분석을 통한 교통소음예측 소프트웨어 개발)

  • Mun, Sung-Ho;Lee, Kwang-Ho;Cho, Dae-Seung
    • International Journal of Highway Engineering
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    • v.13 no.2
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    • pp.67-75
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    • 2011
  • Domestic economic development, industrialization, and urbanization have brought along not only increased highway traffic but also elevated traffic noise levels. Thus, it is necessary to accurately predict the traffic noise levels in order to address the public demand of alleviating the noise levels in urban areas. In this study, the method of evaluating the sound power level of road traffic was investigated in terms of considering the types of road surface and vehicle, based on previous researches. Regarding CPX (Close Proximity Test) and Pass-by test, the measured noise data of Test Road of Korea Highway Corporation were utilized in order to construct the database of sound power levels of various vehicles. Specifically, the 38 noise measurement and analysis in 1/1-octave band frequencies at 12 pre-selected sites were carried out, considering topography and road surface. Finally, the comparison study was conducted between predicted and measured data in terms of traffic noise. The traffic noise prediction was based on the KRON (Korea Road Noise) program, which was developed being equipped wit 3-dimensional GUI. In addition, the traffic noise characteristics were evaluated in terms of vehicle types and pavement surface conditions.

Development of Noise Prediction Program for HRSG (HRSG 소음예측 프로그램 개발)

  • Cheong, Cheol-Ung;Ryu, Jae-Wook;Nam, Kyoung-Hun;Lee, Byeong-Eun;Lee, Soo-Gab
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.389-395
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    • 2000
  • It is usually the contractual responsibility of HRSG(Heat Recovery Steam Generator) supplier to limit combustion turbine exhaust noise at cogeneration sites. Thus, it is necessary to predict the noise level from HRSG at the stage of preliminary design. HRSG is usually composed of inlet duct, main casing, outlet duct, stack. To satisfy the noise limit level, additional equipments are sometimes required - duct shroud, silencer. We develop algorithms for predicting the noise emission from all these equipments of HRSG units. For the convenience of user, we develop the GUI window version program, named NP-HRSG program. To evaluate the accuracy of this program, predicted noise levels from a real HRSG model are compared with measured data. Through this comparison, we observe that the maximum error is just about 3dB.

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Noise Analysis and Countermeasures of Training Aircraft(C172) According to Flight Course (비행경로에 따른 훈련용 항공기(C172)의 소음 분석 및 대책)

  • Jeon, Seung-Joon;Kim, Woo-Jin
    • The Journal of the Korea Contents Association
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    • v.18 no.6
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    • pp.235-242
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    • 2018
  • This study has been conducted for current situation of and countermeasures for aircraft noise. Aircraft noise is difficult to control, because of its wide-range effects, and it needs a great deal of funding for noise prevention like removal airport or land purchasing. And, in effort of determine whether aircraft noise can have health effects such as hearing loss, hypertension and psychological stress. This study, which uses of noise data around flight training airports in Korea, tries to understand and confirm related laws and regulations, and present civil application and situation of countermeasures. And, by measuring data of flight training airport, the situation of training aircraft noise problem have tried to confirm. To overcome these limitations and establish appropriate measures against noise, we made noise map with INM version 7.0, FAA aircraft noise prediction program, and evaluated aircraft noise. To overcome these limitations and establish appropriate measures against noise, we made noise map with INM version 7.0, FAA aircraft noise prediction program, and evaluated aircraft noise. In particular, the FAA's Integrated Noise Model(INM) is widely used by the civilian aviation community for evaluating aircraft noise impacts in the vicinity of airports. We analyzed noise impact by applying several scenarios. As these analysis, we suggest flight route without overlapping with residential area and without affecting flight safety.

Prediction Method for Road Traffic Noise (도로교통소음 예측방법에 관한 연구)

  • Kim, Ha-Geun;Sohn, Jang-Yeul;Kim, Heung-Sik
    • The Journal of the Acoustical Society of Korea
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    • v.14 no.4
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    • pp.100-108
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    • 1995
  • This study is aimed to show that revised prediction method in road traffic noise after comparing prediction method of National Institute of Environmental Research with that of the Acoustical Society of Japan. For this purpose, prediction equation and caluation procedure of each case was programmized and data predicted by each method were compared with those measured in the 14 fields. The result show that data predicted by 14 fields. The result show that data predicted by the method proposed in this study were closer to the data measured in the fields than those predicted by National Institute of Environmental Research and the Acoustical Society of Japan in the surroundings of urban express way (include highway) and general traffic road where the vehicle speed is higher than 40km/h.

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A Development of Waveform Composition Program and Evaluation of Application on Site (파형합성 프로그램 개발 및 현장 적용성 평가)

  • Yoon, Ji-Sun;Woo, Taek-Gyu;Bae, Sang-Hoon
    • Explosives and Blasting
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    • v.27 no.1
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    • pp.38-46
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    • 2009
  • Recently, as a reduction method of vibration and noise, an electronic detonation which has an accuracy of time and a freedom of input delay time was introduced. A waveform composition program can determine a delay time and accomplish simulation under environment similar to real blast using a delay time. In this study, optimum delay time which controls vibration is obtained and real measurement vibration level is estimated by a waveform composition program.

Study on the Acoustic Properties of Porous Materials by Using Acoustical Transfer Matrix (전달행렬법에 의한 다공질 흡음재료의 음향특성 연구)

  • 염창훈;박철희;주재만
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.323-330
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    • 1994
  • 본 연구에서는 다공질 흡음재료 중 closed cell 구조를 갖는 발포수지재료(Foamed Material)에 음(sound)이 입사할 때 발생하는 흡음현상을 보다 정확히 예측하기 위해서 다공질 흡음재료에 대한 Biot 이론에 근거한 Allard의 모델링기법[4]을 이용하여 해석 프로그램을 개발하였고, 이를 이용하여 다공질 흡음재료가 단층(single layer)일 때 이 재료의 Surface Impedance와 흡음률(Absorption Coefficient)을 예측하고, 물성치(parameters)변화에 따른 다공질 흡음재료의 흡음특성을 분석하였으며, 이 재료가 자동차 제조시 사용되는 압연강판(rolled steel piate)에 부착되었을 때의 투과손실(Transmission Loss)을 예측하였고, 또한 다공질 흡음재료는 중고주파 대역의 음에 대한 흡음특성은 좋지만 저주파 대역의 음에 대한 흡음특성은 좋지 않으므로 흡음 재료의 저주파 대역의 흡음특성을 향상시키기 위해서 2층(two layers)으로 하였을 때의 흡음특성을 분석하였다. 본 논문의 연구결과는 자동차 제조시 사용되어지는 다공질 흡음재료는 물론 산업용기계나 건축용등 여러 분야에서 사용되어지는 다공질 흡음재료의 흡음특성 분석에 응용될 수 있으리라 기대된다.

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