• Title/Summary/Keyword: noise reduction

Search Result 3,549, Processing Time 0.034 seconds

Effect of Noise Reduction by Installation of a Point to Point Speed Camera (실측자료를 통한 구간단속카메라의 소음저감효과 분석)

  • Son, Jin Hee;Chun, Hyung-Joon;Choung, Tae Ryaug;Park, Young Min;Kim, Deuk Sung
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.27 no.1
    • /
    • pp.57-64
    • /
    • 2017
  • This study was reviewed the noise reduction effects with installation of 'point to point speed camera' for controlling the speed of the car. The multiple regression analysis was performed to know how the relationship between the noise level and these parameters, such as measured traffic volume and rate of heavy vehicle and weighted average speed was changed with and without the 'point to point speed camera'. In the analysis results shows that the less traffic volume, the more noise reduction effect has been increased and the more traffic volume, the more noise reduction effect has been reduced. And noise reduction effects by the 'point to point speed camera' was different from each measured point. The cause of the difference was determined that inadequate 'point to point speed camera' position to see the effect of noise reduction. It is determined to require a more study to improve the noise reduction effects of the 'point to point speed camera' such as the camera position adjustment.

Noise Evaluation and Measures of Cooling Tower at Apartment (아파트 냉각탑의 소음 평가 및 대책)

  • Lee, Kyu-Bae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2004.11a
    • /
    • pp.1020-1023
    • /
    • 2004
  • Recently, Cooling tower are used the necessary element in a residential area and living space on the viewpoint of indoor temperature control. The purpose of this study is to assistance the comfortable environment and economical measures of noise transmission mechanism on tile cooling tower. The results show that noise evaluation interact the main factor of distance reduction and diffraction reduction. Noise criterion apply to the NC level and equivalent transmission loss about already the design of noise reduction.

  • PDF

Assessment of Can Factory working noise and its reduction (산업현장의 소음.진동 원인분석 및 저감방안 연구)

  • Chun, Hyung-Jun;Ko, Sun-Hee;Chang, Seo-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.212-216
    • /
    • 2006
  • The purpose of this study is to obtain an effective enclosing method for noise reduction of press machine operating in a manufacturing company located in Korea. Noise level of the machine is about $90{\sim}105dB$ which is higher than legal standards by industrial safety and health law. This study has predicted the level of noise reduction according to a step by step prevention plan by considering the characteristics of the cause of noise, the permitted limit of noise levels, problems and economical efficiency attendant upon the noise prevention measures. The predicted level of noise at the plant in accordance with the first step is $71.5{\sim}89.5dB(A)$, and can satisfy the permitted limit of noise in a time period of the day. Based on these results, enclosing method adequate for the selected plant's noise characteristics were suggested.

  • PDF

A Study on Curving noise control by absorption treatment in Urban Rail Transit System (흡음에 의한 도시철도 곡선부 소음저감에 관한 연구)

  • 이재원;손진희;장서일
    • Proceedings of the KSR Conference
    • /
    • 2002.05a
    • /
    • pp.603-608
    • /
    • 2002
  • Sound absorbing materials are applied to the exposed surfaces of curved subway tunnel for the reduction of curving noise level. Before the treatment, acoustical engineering simulation is performed to predict the noise level reduction for different kinds and amounts of absorbing material. The principle of geometrical acoustics is utilized to Peform the simulation efficiently and accurately. The noise levels of the inside and outside of running car body are measured to find the noise level reduction. The average noise level reduction of 8 ㏈ has been attained. It has been shown that the simulated results are comparable to the measured ones.

  • PDF

Analysis of the Reduction of Light-weight Imapct Noise for Load Condition of Floating Floor (뜬바닥층의 하중조건에 따른 경량충격음 저감량 분석)

  • Kim, Myung-Jun;Lee, Sung-Ho;Yang, Jae-Hoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.356-360
    • /
    • 2006
  • Recently, for the purpose of improving the isolation performance of impact noise, many resilient materials have been installed in a residential building. As one of the reduction method for improving the performance of light-weight impact noise, this study is focused on the load condition of floating layer over resilient material. We studied the correlation between the mass or load of the floating layer and the reduction of light-weight impact noise by experiments in reverberation chamber for testing the impact noise. The results show that the reduction of impact noise is improved by increasing the mass per unit area of floating layer until about $140kg/m^2$. But the reduction is not obvious by adding extra mass on the floating layer.

  • PDF

A Research on the Noise Reduction of Range Hood for Household (가정용 레인지 후드의 소음저감에 관한 연구)

  • Hong, Byung-Kuk;Song, Hwa-Young;Lee, Dong-Hoon;Lee, Chang-Kun;Kim, Dong-Yun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2005.11a
    • /
    • pp.449-452
    • /
    • 2005
  • This paper introduces a study for the noise reduction of a range hood for household. Generally, range hoods have a built-in sirocco fan from which squawky noises are generated. Though the squawky noises have low noise level, these kinds of noises make most of the users nervous. For the purpose of noise reduction, in this study, a perforated plate system is installed in the fan housing of range hood. From the experimental results, it is confirmed that the noise level omitted front the range hood is decreased above 2dB(A) in all frequency regions due to the effect of noise reduction by perforated panel system.

  • PDF

Study on the noise reduction occurred to rotation in duct (덕트 회전체에서 발생하는 소음저감에 대한 연구)

  • Park, Hong-Ul;Kim, You-Jae;Park, Sung-Kwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.875-879
    • /
    • 2006
  • Noise reduction has become a major issue of the duct air-conditioners. This paper describes the reduction of noise and vibration of rotational slim duct system. The design of slim duct system is the most important point of noise reduction in terms of the motor of 2f line noise, resonance noise between forced frequency and natural frequency of Sirocco fan, unbalance noise of motor axis and the noise induced refrigerant. The noise of duct system is mainly measured from diffuser and bottom of duct. The optimal design was implemented after measuring the effect of noise and vibration in each part which is composed of duct system. In this paper, experimental results show that the main elements in air-conditioner duct design. These elements are anti-vibration rubber of motor, axis length of motor, rubber coupler, materials of sirocco fan and control method of motor which are the most vital factors in reducing noise.

  • PDF

A Study for the Reduction of Railway Noise (철도운행선의 생활소음 저감방안 연구)

  • Han, Du-Seob;Kim, Hee-Man;Lee, Sang-Bae;Lee, Jin-Ho;Kang, Sung-Hae
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.05a
    • /
    • pp.673-676
    • /
    • 2007
  • These days, the damage of noise has increased seriously by rapid change of life style because of the centralization of urban population, and the rapid increase of traffic. The Ministry of Environment has emphasis on the systematic management about the noise of daily life and the close connection of daily noise management policy with relevant ministries, and put into practice "the master plan of lessening the noise of daily life" from year 2006. This study tried to find out the reduction methods and the effective management of railway noise in the action plan of railway part of "the master plan of lessening the noise of daily life". According to this study, railway noise can be reduced greatly by taking action of railway detail plans. The cause of railway noise varies by rolling stock, track and more, so the reduction methods of railway noise can be studied specially, scientifically and constantly in every field.

  • PDF

Development of Noise Prediction Program in Construction Sites (건설 공사장 간이 소음 예측 프로그램 개발)

  • Kim, Ha-Geun;Joo, Si-Woong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.05a
    • /
    • pp.1157-1161
    • /
    • 2007
  • A construction noise is the main reason for people's petition among the pollution. The purpose of this study is to develop the noise prediction program to see the level of the noise on the construction site more accurately. For this purpose, the database of the power level on the various equipments was made. The noise reduction by distance and the noise reduction by diffraction of barrier were mainly considered and calculated. The simple noise prediction program will provide the information about proper height and length of the potable barrier which satisfies noise criteria of the construction sites from a construction planning stage. To investigate the reliability of this program, the predicted data was compared with the measured data. An average of difference between measured data and predicted data is 1.3 dB(A) and a coefficient of correlation is about 0.95.

  • PDF

Comparison of Noise Reduction Policy in Medium-sized Airports (중형 규모 공항의 소음저감 정책 분석)

  • Kim, Young-Rok;Lim, Jae-Hwan;Choi, Youn-Chul;Song, Ki-han;Shin, Hong-Woo
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.26 no.4
    • /
    • pp.155-163
    • /
    • 2018
  • The development in air transport increases noise around the airport. In order to reduce the noise around the airport, International Civil Aviation Organization has made a lot of effort since the 1970s and Many countries, including South Korea, are implementing many noise reduction policies. This paper investigates those noise reduction policies of medium-sized airports with similar frequency to Gimpo, Jeju and Gimhae airports in South Korea and compares eleven airports in Europe, eleven airports in Asia and five airports in America, including Oceania. According to the research, European countries developed and applied the navigation procedure to avoid the noise area according to the characteristics of the airport. In Asia, there are not as many domestic noise reduction policies. In case of the United States, it provides information only on noise-sensitive areas around airports. After having investigated various policies, this research has examined the noise reduction policy of South Korea. It is concluded that new navigation procedures which reduce noise should be developed.