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  • Noise from ships in ports Possibilities for noise reduction

    4 POSSIBILITIES FOR NOISE REDUCTION 23 4.1 DIESEL GENERATOR EXHAUST 23 4.1.1 Silencers 23 4.1.2 Example 25 4.1.3 On shore power 25 4.1.4 Calculation example 2 Reducing noise from the engine room ventilation 26 4.2 VENTILATION 27 4.2.1 Standard silencers 27 4.3 SECONDARY NOISE SOURCES 28 4.4 OTHER NOISE REDUCING MEASURES 28

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  • A Case Study of Low Frequency Noise Assessed using DIN

    assess low frequency noise in a case study carried out in Britain. The current legal status of this approach in British law is uncleat nevertheless DIN 45680 proved to be a valuable diagnostic tool in resolving the case study and as a predictor of annoyance due to low frequency noise.

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  • Low frequency noise reduction from building technical

    Mechanical equipment (fans chillers motors) produces airborne and structure‐borne noise with a significant low frequency component. However in many applications mitigation of the low frequency noise requires implementation of significant mass barrier in combination with an air space. This work presents case studies on the use of a novel lightweight and thin acoustical material to

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  • Effects of low frequency noise on man-a case study

    Effects of low frequency noise on man-a case study J Feldmann 1 FA Pitten 2 1 Institut für Technische Akustik Technische Universität Berlin Einsteinufer 25 D-10587 Berlin Germany 2 Institute of Hygiene and Microbiology University of Würzburg Josef-Schneider Str.2 97080 Würzburg Germany

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  • Effects of low frequency noise on man-a case study

    Effects of low frequency noise on man-a case study J Feldmann 1 FA Pitten 2 1 Institut für Technische Akustik Technische Universität Berlin Einsteinufer 25 D-10587 Berlin Germany 2 Institute of Hygiene and Microbiology University of Würzburg Josef-Schneider Str.2 97080 Würzburg Germany

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  • SilentiumActive noise reduction control and

    Silentium has developed unique Active Noise Control (ANC) technology and an entire disruptive sound management solution incorporating proprietary innovative algorithms that adaptively follow the changes in the noise spectrum achieving extraordinary results of almost 10dB (A) noise reduction. The result is a small low-cost highly effective

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  • Low frequency noise reduction from building technical

    Low frequency noise reduction from building technical equipment A case study

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  • Health Effects Related to Wind Turbine Noise Exposure A

    Dec 04 2014 · None of the included studies investigated the relationship of health effects and exposure to low-frequency noise or infrasound however infrasound and low-frequency noise emission from wind turbines were measured and studied in a number of the publications retrieved from the 252 articles initially selected –.

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  • A Case Study of Low Frequency Noise Assessed Using DIN

    A Case Study of Low Frequency Noise Assessed using DIN 45680 Criteria 184 JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL this

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  • Low frequency noise reduction from building technical

    Mechanical equipment (fans chillers motors) produces airborne and structure‐borne noise with a significant low frequency component. However in many applications mitigation of the low frequency noise requires implementation of significant mass barrier in combination with an air space. This work presents case studies on the use of a novel lightweight and thin acoustical material to

    Read More
  • Reducing harmonics with IEEE 519 practices procedures

    May 20 2014 · With increased use of nonlinear loads power supply harmonics are more noticeable than ever. Controlling and monitoring industrial system designs and their effects on utility distribution systems are potential problems for the industrial consumer who is responsible for complying with the IEEE 519 recommended practices and procedures.

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  • Impacts of low frequency noise exposure on well-being a

    Year 2018 Volume 20 Issue 95 Page Impacts of low frequency noise exposure on well-being a case-study from portugal Juliana A Alves 1 Ligia T Silva 2 Paula C Remoaldo 3 1 Lab2PTLandscape Heritage and Territory Laboratory. CTACCentre for Territory Environment and Construction Portugal 2 CTACCentre for Territory Environment and Construction Portugal 3

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  • OSHA Technical Manual (OTM) Section III Chapter 5

    Additionally for the same sound pressure level high-frequency noise is much more disturbing and more capable of producing hearing loss than low-frequency noise. Engineering solutions to reduce or control noise are different for low-frequency and high-frequency noise. As a general guideline low-frequency noise is more difficult to control.

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  • Falmouth Massachusetts wind turbine infrasound and low

    Falmouth Massachusetts wind turbine infrasound and low frequency noise measurements Stephen E. Ambrose1 S.E. Ambrose Associates 15 Great Falls Road Windham ME 04062 This case study presents sound level and analyzed measurement data obtained while living in a house 1700 feet from an

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  • Noise Enclosures Bring Sound Levels into Compliance

    Noise Enclosures Bring Sound Levels into Compliance. After a thorough review of the 12 000 square foot facility it was determined that a large sheet planer which is located in the center of the plant was the main source of the high frequency high dBA sound. When operating the sound levels within the facility ranged from 82 to 91 dBA.

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  • SilentiumActive noise reduction control and

    Silentium has developed unique Active Noise Control (ANC) technology and an entire disruptive sound management solution incorporating proprietary innovative algorithms that adaptively follow the changes in the noise spectrum achieving extraordinary results of almost 10dB (A) noise reduction. The result is a small low-cost highly effective

    Read More
  • SilentiumActive noise reduction control and

    Silentium has developed unique Active Noise Control (ANC) technology and an entire disruptive sound management solution incorporating proprietary innovative algorithms that adaptively follow the changes in the noise spectrum achieving extraordinary results of almost 10dB (A) noise reduction. The result is a small low-cost highly effective

    Read More
  • Lincoln County South Dakota Official Website

    Wind Turbine Acoustic Investigation Infrasound and Low-Frequency Noise—A Case Study Stephen E. Ambrose Robert W. Rand and Carmen M. E. Krogh Bulletin of Science Technology Society 2012 32 128 originally published online 17 August 2012 DOI 10.1177/ The online version of this article can be found at

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  • Best Available Techniques for Control of Noise Vibration

    Determination of the Latest Best Available Techniques for Control of Noise and Vibration and Their Applicability to Each of the Regimes with Regulatory Responsibility. The study is a desktop review of current noise assessment methodologies and noise and vibration control practices including case studies.

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  • Saint-Gobain Acoustic insulation glazing

    The acoustic insulation properties of a window are measured with the R sound reduction index. For example a window with an R of 20 decibels should reduce a 60 dB outside traffic noise level to 40 dB within the room. Noise pollution can be in any combination of low medium or high frequency sounds.

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  • Case studyActive control of fan noise

    ineffective and rather expensive at low frequencies. Active Noise Control (ANC) on the other hand can be very efficient and relatively cheaper in reducing low-frequency noise. This case study demonstrates a successful application of ANCa new technology of noise control for low-frequency noiseto a noise problem in an educational

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  • Noise pollutionDealing with the effects of noise

    Noise pollutionNoise pollutionDealing with the effects of noise Noise is more than a mere nuisance. At certain levels and durations of exposure it can cause physical damage to the eardrum and the sensitive hair cells of the inner ear and result in temporary or permanent hearing loss. Hearing loss does not usually occur at SPLs below 80 dBA (eight-hour exposure levels are best kept

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  • Reducing Compressor Noise While Considering System

    reducing compressor noise while considering system interactions. Techniques are discussed for isolation to low frequency requires low-durometer grommets. But the weight of the compressor NOISE REDUCTION CASE STUDY Cylinder disengagement-type compressors operate on fewer cylinders when the capacity demands are less. For instance two

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  • The Reduction of Low Frequency Gas Turbine Exhaust Noise

    This led to the design of a thick panel absorber which was installed at the rear of a 90 degree turn in the exhaust system. Field testing verified that the low frequency noise from the turbine exhaust was reduced by 5.9 and 6.7 dB in the 31.5 and 63 Hz octave bands respectively and by 5.5 dB(C) overall.

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  • Nor848A Acoustic cameraWordPress

    Case Study Innovative sound instrumentation Nor848A Acoustic camera Identifying Low-Frequency Tonal Noise in Windy and Noisy Conditions Jørgen Grythe Norsonic AS Problem A large LNG gas facility (approximately 300m x 150m) producing 300 000 tons of LNG annually is situated in a ter-minal area with the nearest populated area at a distance

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  • Noise Pollution Free Essay ExampleStudyMoose

    Sound is explained in loudness (strength) and pitch (frequency) the exposure is using a logarithmicn decibel (dB) scale. The Occupational Safety and Health Administration (OSHA) advises the hearing security in the work environment if the noise is higher than 85 DB for more than 8 hours since there is an opportunity of the prospective hearing loss.

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  • A case study of interior low-frequency noise from box

    A side effect of high-speed railway and urban rail transit systems is the associated vibration and noise. Since the use of concrete viaducts is predominant in railway construction due to scarce land resources low-frequency (20–200 Hz) structure-radiated noise from concrete bridges is a principal concern.

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  • Wind Turbine Acoustic Investigation Infrasound and Low

    An acoustical study was conducted to investigate the presence of infrasonic and low-frequency noise emissions from wind turbines located in Falmouth Massachusetts USA. During the study the investigating acousticians experienced adverse health effects consistent with those reported by some Falmouth residents.

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  • Ships noise is serious problem for killer the Guardian

    Feb 02 2016 · The low rumble of passing ships has long been connected to the disturbance of large whales. But US researchers have documented persistent noise also occurring at

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  • CASE STUDY OF LOW-FREQUENCY FOOTSTEP SOUND TRANSMISSION

    case study of low-frequency footstep sound transmission Published by Guset User 17 10 02 Description 3.2 PROBLEMS AND REMEDIES After the building was occupied the occupants immediately found that the low-frequency footfall noise was annoying.

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  • Wind Turbine Acoustic © 2012 SAGE Publications

    Low-Frequency Noise—A Case Study Stephen E. Ambrose 1 Robert W. Rand2 and Carmen M. E. Krogh3 Abstract Wind turbines produce sound that is capable of disturbing local residents and is reported to cause annoyance sleep disturbance and other health-related impacts. An acoustical study was conducted to investigate the presence of infrasonic

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  • Annoyance response to low frequency noise with tonal

    Annoyance response to low frequency noise with tonal components A case study on transformer noise Guo-Qing Di⇑ Xi-Xi Zhou Xing-Wang Chen Institute of Environmental Pollution Control Technology Zhejiang University No. 866 Yuhangtang Road Hangzhou 310058 PR China

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  • A case study of interior low-frequency noise from box

    A side effect of high-speed railway and urban rail transit systems is the associated vibration and noise. Since the use of concrete viaducts is predominant in railway construction due to scarce land resources low-frequency (20–200 Hz) structure-radiated noise from concrete bridges is a principal concern.

    Read More
  • Low frequency noise reduction from building technical

    Low frequency noise reduction from building technical equipment A case study Article (PDF Available) in The Journal of the Acoustical Society of America 123(5) 3259 · June 2008 with 254 Reads

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  • A case study of interior low-frequency noise NASA/ADS

    A side effect of high-speed railway and urban rail transit systems is the associated vibration and noise. Since the use of concrete viaducts is predominant in railway construction due to scarce land resources low-frequency (20-200 Hz) structure-radiated noise from concrete bridges is a principal concern. Although it is the most commonly used bridge type the mechanism of noise emission from

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  • Low-frequency impact sound transmission of floating floor

    1. Introduction. Low-frequency human footfall noise transmitted from the upper-floor to lower-floor dwelling units has been reported to be one of the hindrances to acoustic comfort in multifamily buildings and has remained a long-standing problem to be solved. The frequency band in the vibration from human footsteps is generated by a force normal to the surface and concentrated in the

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  • Nor848A Acoustic cameraWordPress

    Case Study Innovative sound instrumentatiton Nor848A Acoustic camera Metro station in Taipei Taiwan Verification of efficiency of noise reduction measures Metro station in Taipei Taiwan May 2013 After the construction of the elevated sky train too high noise levels were appearing under the line and local communities were complaining.

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