acoustic ranging Articles

  • Attenuation of an ultrasonic beam by suspended particles and range of acoustic flow meters in sewer networks

    Ultrasonic flow meters are commonly used in wastewater management. Under certain circumstances, a reduction in the flow meter range may occur and cause significant error in the flow rate measurement. Attenuation due to suspended particles is one of the phenomena capable of reducing the flow meter range. The present paper examines attenuation resulting from re-suspended pond sediment over a wide ...


    By IWA Publishing

  • Distributed Thermal-Acoustic Data Integration

    Silixa has developed a technique called Distributed Thermal Acoustics (DTA) to monitor simultaneously the thermal and acoustic profile along a hybrid optical fibre cable in submarine environments. Using its world leading distributed fibre optic technology (ULTIMATM DTS and iDASTM) Silixa deployed an optical fibre cable along the seabed and across the water column in an active gas seepage ...


    By Silixa Ltd

  • Enhanced acoustic material testing in a tube

    Demands from the Industry   A growing number of customers demand quieter vehicle cabins, and cabin acoustic comfort has become a major concern for the automotive industry. Optimization of the acoustic insulation performance has, therefore, been given a more prevalent role in the design process. In the aircraft industry, acoustic comfort for customers and the use of new, lighter ...

  • Fine-tuning acoustic isolation in buildings

    ACCIONA Infrastructure is ranked among the leading construction companies in the world - and is recognised for implementing the most advanced and innovative technology.  As research and design is vital to keep the company at the cutting edge in relation to technological developments, ACCIONA Infrastructure created a team to analyse noise and vibration. Where traditional ...

  • Ultrasonic Sensors: Range Vs Frequency

    Ultrasonic sensors are pretty cool. Transducers send and receive waves, measurements magically get spit out by the sensor, and nothing had to touch anything, right? You can choose sensors based on range, or type of transducer, or even safety ratings. Most sensors declare their range and frequency together, which seems kind of odd. Why is the range of an ultrasonic sensor tied to its frequency? ...

  • Acoustical characterisation of porous sound absorbing materials: a review

    Over the past 50 years, the characterisation of porous sound absorbing materials has been of increasing interest to both the acoustic engineers and customers. It is particularly important that acoustic engineers are able to predict the acoustical behaviour of these materials to get a quantitative measure of the acoustic energy absorption. This paper reviews the relevant literatures over this ...


    By Inderscience Publishers

  • A Sound Projector for Acoustic Tomography and Global Ocean Monitoring

    Abstract—Long-range underwater acoustic systems, such as those used in ocean acoustic tomography, require low-frequency signals covering a broad frequency band. To meet this requirement, a novel design based on of a tunable narrow-band high-efficiency sound projector has been exploited. The projector transmits a frequency sweep signal by mechanically tuning a resonator tube (or organ pipe) ...

  • 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

  • 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

  • ESTECH marks twentieth year with new acoustic testing site

    Situated less than 40 km from the centre of Tokyo, the two storey building has a hemi-anechoic chamber, an excitation test room and an associated test preparation room. The excitation test room, which can be flexibly partitioned, contains two structural beds isolated from external vibration. And two cranes capable of lifting up to 2.8 tonnes, for moving heavy structures such as engines, tractor ...

  • A novel acoustic imaging tool for monitoring the state of rapid sand filters

    A new technology based on acoustic waves is developed to monitor the state of sand filters used in drinking water treatment. Changes in the sand filter, due to the removal of suspended particles from the water and their accumulation in the pores, result in an increase of the bulk density and acoustic speed of the granular material. Consequently, the reflected acoustic response changes as the ...


    By IWA Publishing

  • Monitoring of a spark ignition engine malfunctions using acoustic signal technique

    This manuscript presents a fault detection method for a SI engine at variable speeds using acoustic signal technique. Two faults were addressed: misfire and the malfunction of manifold absolute pressure (MAP) sensor. The main objective is to detect these two faults by measuring the sound pressure level (SPL) in decibels (dBA) at different engine speeds and one octave frequency bands in the ...


    By Inderscience Publishers

  • Sound treatment and structural optimisation for acoustic performance of front dash with sound contribution

    Dash of the vehicle poses an important role in attenuating the sound radiated from the engine cabin. The acoustical performance of a vehicle dash system is determined by the sound transmission loss (STL). Computational modelling of such system poses challenge due to the complexity of the material properties as well as geometry. In the analysis, a numerical method with structure–sound interaction ...


    By Inderscience Publishers

  • Case study - Finding acoustical weak points in room dividing modular walls

    Problem A conference hotel is using modular walls to divide large halls into several smaller conference rooms. The rooms are divided by modular walls that provide several different opportunities for subdivision and multipurpose use of the large area spaces. When measuring the sound insulation between adjacent rooms through the modular walls, the resulting value was found to be too ...


    By Norsonic AS

  • City of belmont performs comprehensive analysis on rising force mains to guide long-range planning

    To help budget over the next 20 years, the City of Belmont (City) wanted to proactively understand and assess their force mains through a comprehensive condition assessment. Located in the San Francisco Bay area, Belmont serves 26,000 residents and maintains more than 90 miles of sewer mains comprising of 85 miles of gravity mains and 5 miles of force mains, of varying size ...

  • The Basics of Sound Theory and Testing Principles: A Brief Guide for Environmental Professionals

    As awareness of environmental noise pollution grows, environmental professionals not specifically trained or experienced in the field of acoustics or noise control are being increasingly called upon to assess, predict,and/or quantify sound emissions from a variety of industrial sources. This article provides an overview of basic acoustical fundamentals, including the frequency ranges of primary ...

  • In-situ noise level mapping for vehicle floor carpet

    Noise level mapping of test vehicles' floor carpets was undertaken for three frequency bands, that is, low-(2,000 Hz) to compare noise control treatment performance and effectiveness. On-road tests including idling conditions and constant speed tests of 40, 60 and 80 kph were undertaken. Noise level contour maps indicate that the luxury class test vehicle ...


    By Inderscience Publishers

  • Experimental observations of coupled-mode instability in disc brake systems leading to squeal vibration

    A brake system test rig was used to simulate braking operation and measure acoustic pressure, disc temperature and brake pressure during squeal events. Experimental results presented are the strong dependence of squeal frequency content on engagement pressure, the broadening of required brake pressure range for squeal existence as temperature increases, and a periodic squeal behaviour. A model ...


    By Inderscience Publishers

  • miniSODAR

    The miniSODAR is a high-frequency Doppler sodar system that was designed to measure the atmospheric wind profile from 15 meters to 150/200 meters (data is often available to 250 meters) in 5-meter increments. It operates by generating a short tone burst (30 ms to 100 ms) in the frequency range of 4 kHz to 6 kHz. It monitors the low-level acoustic signal echoed by the atmosphere. The echo is ...

  • Achieving a positive driver emotional response on the new Bentley Continental V8

    Bentley brand attributes of driving, luxury, performance, design and craftsmanship are achieved through a painstaking engineering process that addresses a wide range of vehicle attributes. A vital element of this process is the engineering of the vehicles' sound character. Bentley focuses on this attribute to achieve a positive emotional response in all driving conditions with sportiness in high ...


    By Inderscience Publishers

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