sound absorption News

  • New outdoor sound propagation calculation software

    Based on state of the art calculation methods, Mediterranean Acoustics Research & Development has released new outdoor sound propagation calculation software called Olive Tree Lab Terrain. OTL Terrain is aimed at small scale projects as opposed to large mapping software. It addresses mostly fixed noise sources within a small area where there is control over most of the parameters involved in ...

  • Green walls show promise as sound barriers for buildings

    Green walls, designed so they are covered in vegetation, could help cut the amount of noise that enters buildings, a new study has found. In lab. tests, researchers found that a modular green wall system reduced sound levels by 15 decibels (dB). This leads them to believe that it is a promising sound reduction device that could improve quality-of-life for city residents. Green walls and green ...

  • ASTM E1179 - 11 Standard Specification for Sound Sources Used for Testing Open Office Components and Systems

    This specification states the requirements for sound sources used for measuring the speech privacy between open offices or for measuring the laboratory performance of acoustical components. The sound source shall be a loudspeaker enclosed in a box that has a maximum dimension of 0.30 m (1 ft) on a side, to reduce spurious sound reflections. The measurements shall be carried out in a free ...


    By ASTM International

  • ASTM E336 - 11 standard test method for measurement of airborne sound attenuation between rooms in buildings

    The main part of this standard uses procedures originally developed for laboratory measurements of the transmission loss of partitions. These procedures assume that the rooms in which the measurements are made have a sound field that reasonably approximates a diffuse field. Sound pressure levels in such rooms are reasonably uniform throughout the ...


    By ASTM International

  • ASTM E1414 / E1414M - 11a standard test method for airborne sound attenuation between rooms sharing a common ceiling plenum

    Modern offices and other multipurpose buildings commonly have suspended acoustical ceilings installed over room dividing partitions. The test facility prescribed in this test method is useful for providing ceiling attenuation data on the relevant ceiling/partition elements and ...


    By ASTM International

  • ASTM C1482 - 11 standard specification for polyimide flexible cellular thermal and sound absorbing insulation

    This specification covers the composition and physical properties of lightweight, flexible open-cell polyimide foam insulation intended for use as thermal and sound-absorbing insulation for a certain temperature range in commercial and industrial environments. The insulations are classified into the following types: Types I, II, III, IV, V, and VI. Polyimide foam shall be manufactured from the ...


    By ASTM International

  • Noise Impact Assessment Africa

    WKC is proud to announce that it has been awarded a contract to deliver a noise impact assessment for a new 200MW wind farm in East Africa. Wind power capacity in the region is expected to increase by around 12 gigawatts by 2040. The project will convert wind into useful energy utilising an array of highly efficient land based wind turbines. The first phase of the project entails a noise ...


    By WKC Group

  • Noise Impact Assessment Africa

    WKC is proud to announce that it has been awarded a contract to deliver a noise impact assessment for a new 200MW wind farm in East Africa. Wind power capacity in the region is expected to increase by around 12 gigawatts by 2040. The project will convert wind into useful energy utilising an array of highly efficient land based wind turbines. The first phase of the ...


    By WKC Group

  • PULSE 21 is here - New software and applications, with focus on performance

    The latest release of PULSE includes new software and applications for a range of industries, and enhancements in PULSE Reflex and LabShop. In this release, we have focused on performance, because speed and stability is key when measuring and analyzing data. Structural dynamics PULSE Reflex Stepped Sine Measurements ...

  • What`s in your soil?

    The latest in modern soil mineralogical methods is now available from the Soil Science Society of America (SSSA) in their new monograph Methods of Soil Analysis. Part 5. Mineralogical Methods (2008). The new edition reflects improvements in old techniques and presents new techniques and instrumentation with more quantitative analysis, giving students and scientists established methods for ...


  • Keeping cool in Australia using the summer heat

    The leader of the Flagship’s solar cooling research project, Dr Stephen White, says significant greenhouse gas savings can be achieved in air conditioning by using energy from the sun. “Solar cooling utilises heat from solar thermal collectors to generate cooling for building air-conditioning,” he says. “Most conventional mechanical air conditioners use high-emission electricity derived from ...

  • Signal StreetBox Compact System for Air Quality Monitoring

    Signal has launched a unique product aimed at the gap in the market between full reference monitoring stations and simple absorption tubes. The StreetBox is an electrochemical sensor based, battery operated air pollution monitor capable of measuring up to three gases or PM10 plus environmental parameters such as wind speed and direction. Where reference equipment is expensive, large and ...


    By Signal Group Ltd

  • We’re hearing work-related noise issues, loud and clear

    While awareness of how exposure to harmful dust in the workplace is on the increase, as are the methods for effectively monitoring this, the ongoing problem of noise induced hearing loss, as the global number one preventable occupational disease cannot be ignored. According to a recent article issued by North America’s National Institute of Occupational Health and safety (NIOSH) hearing ...


    By Casella

  • Protecting Workers from Hearing Lose Due to Excessive Noise Levels

    Worker exposure to environmental noise is sometimes difficult to avoid. However, understanding noise levels employees are exposed to is not difficult. The most significant effect of high noise levels is permanent hearing loss. Hearing loss and the degree of loss are directly related to the total energy impacting the ears. Often, the total energy at a noise source cannot be changed. In these ...


    By Clark Seif Clark Inc.

  • Effects of Noise on Bar, Pub and Nightclub Workers

    Since music and entertainment noise is generally regarded as desirable as opposed to undesirable noise, it tends to be overlooked compared to noise in other industries. However, a 2004 TUC/RNID health and safety report revealed that ...


    By Pulsar Instruments plc

  • A Tale of Two Cities' Black Carbon Measurement

    Advanced photoacoustic measurement of black carbon particles, using equipment available via UK-based Enviro Technology, has led to a better understanding of pollution in Los Angeles and Mexico City. PAX (Photoacoustic Extinctiometer) Black Carbon Monitors have been deployed to deliver a more accurate picture of daily black carbon trends in ...

  • IPCC assesses geoengineering proposals

    Geoengineering experts, who gathered this week to assess proposals for manipulating the earth to avoid climate disaster, have stressed that they are not planning to make recommendations about actions the world should take — but are merely assessing whether the proposals are sound science. Spraying the atmosphere with aerosols; changing the colour of clouds; and 'fertilising' oceans with ...


    By SciDev.Net

  • GM Awards GDC with Supplier Environmental Excellence

    SOURCE: General Motors DESCRIPTION: DETROIT, January 28, 2013 /3BL Media/ – GDC, Inc., a Tier One component supplier based in Goshen, Ind., is being recognized with the General Motors Environmental Excellence Award ...


    By General Motors Corp

  • ASTM D5456 - 11a Standard Specification for Evaluation of Structural Composite Lumber Products

    This specification recognizes the complexity of structural glued products. This specification, or parts thereof, shall be applicable to structural composite lumber portions of manufactured structural components. Tests shall be performed to determine the properties of the material in accordance to the ...


    By ASTM International

  • Papyrus plant detox for slaughterhouses

    Humans have used the papyrus sedge for millennia. The Ancient Egyptians wrote on it, it can be made into highly buoyant boats, it is grown for ornamentation and parts can even be eaten. Now, writing in the International Journal of Environmental Technology and Management, researchers in Uganda have demonstrated that growing papyrus can be used to soak up toxins and other noxious residues from ...


    By Inderscience Publishers

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