Environmental Acoustics Articles

  • Rodelta boosts capacity PWN! - Case Study

    PWN Pure Water and Nature (a water supply company in North Holland) supplies tap water to thousands of customers. With the number tap water connections increasing to 750,000, it became apparent that the existing 8 Rodelta NSM 7310 pumps, although still working well, would need to be upgraded for capacity. THE CHALLENGE PWN Pure Water and Nature (a water supply company in ...

  • Small yet robust - Case study

    Cirrus Research’s doseBadge provides the perfect solution for dB Consultation. From manufacturing and engineering, to the entertainment industry and schools, noisy environments need to be monitored both for the welfare of employees and the wider community. Following the introduction of The Control of Noise at Work Regulations 2005, businesses need to be aware of their employees ...


    By Cirrus Research plc

  • Invictus on the right track - Case study

    An international acoustic consultancy was engaged by contractor Balfour Beatty on behalf of the end client Network Rail in this landmark project that is revolutionising transport across London. The Project: The new rail link will help cut journey times to the heart of the capital by two thirds in some cases, passing through 37 stations and running 118km from Maidenhead and ...


    By Cirrus Research plc

  • A new and improved courtyard at Wynberg Girls High School in Cape Town with Geoplast Drainroof - Case Study

    Drainroof, Geoplast’s solution for roof gardens made of recycled low-density propylene, was recently chosen for alterations at Wynberg Girls High School in Cape Town. Noero Architects, a prestigious architectural firm with offices in Cape Town and Port Elizabeth, conceived and supervised the project, while Abrach Construction carried it out. De Villiers & Hulme participated as ...


    By Geoplast US Corp.

  • B&W Acquires Universal Acoustic & Emission Technologies, Inc.

    Babcock & Wilcox Enterprises, Inc. (B&W) (NYSE:BW) has acquired Universal Acoustic & Emission Technologies, Inc. (UniversalAET), a Wisconsin-based provider of custom-engineered acoustic, emission and filtration solutions, effective today. UniversalAET is a bolt-on acquisition for B&W MEGTEC and will be included in B&W’s Industrial operating segment. The ...


    By Dürr Megtec LLC

  • Sound Absorption for All Saints Church Community Centre

    Acoustic specialists, Sound Reduction Systems (SRS Ltd) were approached by All Saints Church with a view to treating the poor acoustics within their community centre. They had recognised that high levels of reverberation and echo were affecting the various groups that used the space, and were looking for a solution that was both effective and decorative. Initially, Mr Les Munns (Church Building ...


    By Sound Reduction Systems Ltd

  • Optimus and Invictus are the Classic Combination - Case Study

    Imagine a perfect summer’s evening with a 40-strong classical orchestra playing to an appreciative audience in a leafy green park. So far, so very English. Add in the fact the Park is in the heart of Lancaster city surrounded by thousands of homes and the orchestra is playing sets of the Hacienda’s classic 90s house music hits and you can understand the headache facing Acoustic ...


    By Cirrus Research plc

  • Let’s Clear Up Some Things About Distortion…

    'Distortion' is an important characteristic of audio components and is often stated in the product specifications for speakers, amplifiers and other audio and acoustic devices. Unfortunately terminology is often used incorrectly or important additional information is omitted. In this article we aim to provide clarity of the concepts and measurement methods and their proper use. ...


    By NTi Audio AG

  • Case study - Filming sound leakages in highly reflective office environment

    Problem A newly built office complex is designed with glass facades between the offices and the hallway. The glass facades include a glass door. Although the glass structures themselves have a sufficient sound reduction value, the sound insulation between office and hallway was measured at 19 dB, which was far below the sound insulation criteria for offices given in the regulations. It was ...


    By Norsonic AS

  • Cam correlation analysis using Acoustic discharge measurement

    The low head hydro power plant in Wettingen, Switzerland, is in operation since 1933 and no effective cam optimization has been carried out up to now. The goal of the measuring campaign was to provide data enabling an economic study for a retrofit and upgrade project of the plant and the measurement of the efficiency improvement of turbines after refurbishment. The contribution discusses cam ...


    By HydroVision GmbH

  • Discharge Measurement in a Short Intake with a Converging Section – a Case Study

    In the context of a planned retrofit and upgrade of the hydropower plant Wettingen, operated by the Elektrizitätswerke Zürich, three intakes were equipped with acoustic transit time flow measuring devices. Since the flow meters are installed in a converging section, downstream of a pier, it became necessary to perform numerical flow simulations in order to weight the acoustic path ...


    By HydroVision GmbH

  • Case study - Wall leakage testing in the lab with acoustic camera

    Problem Facade insulation testing is usually performed by using a loudspeaker in the sending room, and record the sound pressure level (SPL) with microphones in both the sending and receiving room. The difference in SPL adjusted for the size of the dividing wall element will then give an estimate of the sound reduction quality of that element. However these measurements will not say ...


    By Norsonic AS

  • Sensitivity of response of LISST-ABS and OBS to size distribution changes

    This Note shows how the calibration of the LISST-ABS acoustic backscatter sensor and of optical backscatter sensor (OBS) changes when water contains a broad distribution of particle sizes, and why LISST-ABS is inherently superior. Particle size distributions in water are usually not very narrow, i.e. particles of more than a single size exist in suspension. It is common practice to consider ...


    By Sequoia Scientific, Inc.

  • How the LISST-ABS works

    INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points along the acoustic beams (‘ranges’), the LISST-ABS  only reports backscatter signal strength at a single point about 5 cm from the transducer. The ...


    By Sequoia Scientific, Inc.

  • That air conditioner noise is annoying!

    The sound of the HVAC System in your office or factory may be annoying depending on who you ask; the person who has to live with it, or the person who has to pay for it. To measure background noise levels objectively, we use Noise Curves. International standards organizations (ISO, ANSI and ASA) recognize the need to objectify judgements on the amount of ambient noise in enclosed ...


    By NTi Audio AG

  • Case study - Using acoustic camera inside caravan car to find squeak and rattle noise

    Problem When driving a caravan car, the driver could hear annoying noises from behind the driver’s cab in the living compartment. Even though the noises could be heard clearly, it was very difficult to discover the exact location and cause of the various annoying sounds due to overwhelming background noise. When the car was standing still with the engine running, no extra ...


    By Norsonic AS

  • Acoustically induced vibration: A review of industry best practice

    WKC Partner and Noise and Vibration practice leader, Richard Palmer, has recently had an article published in the Institute of Acoustics (IOA) Journal titled ‘Acoustically Induced Vibration: A Review of Industry Best Practice’. This technical paper, which provides the reader with a better understanding of the AIV phenomenon, was published in the IOA Journal in September 2015.  ...


    By WKC Group

  • Port of London Authority Tidal Monitoring System - POLATIDE 5: Detailed - Case Study

    Introduction: Valeport and OceanWise have designed and delivered a complete tidal monitoring system, including tide gauges, telemetry equipment, servers, databases, system control, data management and display software, to the Port of London Authority. The system was installed in October 2013 and rigorous testing completed in February 2014.  Background: ...


    By Valeport Ltd

  • How Often You Should Calibrate A Sound Level Meter

    Do you calibrate a sound level meter frequently? Most sound level meter users know they must calibrate their sound level meters but a questions I frequently get asked if “how often?” Here’s my best practice advice so you can calibrate with confidence. What Do We Mean by Sound Level Meter ...


    By Cirrus Research plc

  • Short-term noise monitoring with Delta Acoustics case study

    Noise monitoring does not require a large amount of expertise or investment in expensive equipment. DELTA learned how measurement projects with high technology demands could easily be solved with a Noise Sentinel On Demand subscription. Challenge Demands for quick calculation validations on noise measurements that had to comply with strict ISO regulations ...

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