sound attenuation wall Articles

  • Impact of sound attenuation by suspended sediment on ADCP backscatter calibrations

    Abstract. Although designed for velocity measurements, acoustic Doppler current profilers (ADCPs) are widely being used to monitor suspended particulate matter in rivers and in marine environments. To quantify mass concentrations of suspended matter, ADCP backscatter is generally calibrated with in situ measurements. ADCP backscatter calibrations are often highly site-specific and season ...


    By Teledyne RD Instruments

  • Dissipative expansion chambers with two concentric layers of fibrous material

    The acoustic performance of a dissipative expansion chamber lined with two concentric, annular layers of fibrous material with different resistances is investigated. A two-dimensional analytical approach is used to determine the transmission loss of this dissipative silencer. From the boundary conditions at the rigid wall, and the interfaces between the fibre layers and the central airway, the ...


    By Inderscience Publishers

  • Ask Yourself These Questions Before You Buy a Granulator

    Ask Yourself These Questions Before You Buy a Granulator 1 WHAT DO YOU WANT TO GRIND? * Consider: Type of part or sprue/runner system, type of material (hard/soft, brittle/tough, filled/unfilled), and temperature of parts being granulated. * Determines: Rotor design, horsepower, sound attenuation, ...


    By Harden Industries Ltd.

  • UWB Subsurface Radar With Antenna Array for Imaging Of Internal Structure Of Concrete Structural Elements

    Introduction The basic design principals implemented in the advanced UWB radar with time-domain operation and with the 100 - 900 MHz effective band are considered including real synthetic array and full-polarimetric schema. The radar is installing on a moveable platform for remote operation on the territories with radioactive pollution. This probing system should be employed near the nuclear ...


    By Transient Technologies LLC

  • Two Technologies for Flow Measurement from Outside a Pipe

    Doppler and Transit Time are two very popular types of flow meter for non-invasive measurement of flow in full pipes. We tend to confuse these technologies because they are both ultrasonic and both measure flow by using sensors clamped onto the outside of a pipe. In the real world they actually work best in opposite applications. Success in your installation depends on understanding the ...


    By Greyline Instruments Inc.

  • Sonic booms – environmentally friendly?

    JAXA and Brüel & Kjær Join Forces to Measure Sonic Booms Brüel & Kjær and JAXA join forces in a research project to measure sonic booms. Side-by-side with JAXA’s ABBA sonic boom system, Brüel & Kjær’s PULSE LAN-XI based data acquisition and analysis system is used to study the effects of sonic booms on buildings. When ...

  • Sea Level Rise: Risk and Resilience in Coastal Cities

    Introduction One of the most dire impacts of anthropogenic climate change is a rise in the global sea level caused by the melting of glaciers and land-based ice caps, as well as a smaller increase from expansion due to the higher temperature of the water itself.  Unlike some other predicted effects of climate change, this impact has already been observed for some time.  Indeed, ...


    By Climate Institute

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