noise calculation Articles

  • Micro Pulse LiDAR: A Critical Tool for Emissions Source Detection

    Micro Pulse LiDAR remote sensing data are used to calculate a highly accurate Planetary Boundary Layer (PBL) height to improve plume models that help assess emissions sources. ...

  • UK Research Reveals Lima as Fastest Noise Mapping Package

    In June 2006, Hepworth Acoustics Limited presented two papers at Euronoise 2006 in Tampere, Finland (see www.bksv.com/4112.asp) on research carried out for the United Kingdom government into noise mapping calculation time. The research was carried out in support of Defra’s Noise Research Advisory Service (NRAS) contract and studied the effect of calculation efficiency ...

  • Current Trends in Environmental Noise Calculation Software in Europe

    Introduction This paper briefly describes the state of the art of development of environmental noise calculation software in Europe, concentrated on the following areas: • The Harmonoise and Imagine projects and the Good Practice Guide on Strategic Noise Mapping • The role of combining measurements and calculations for more flexible problem solving • Uncertainty: qualitative methods ...

  • A three–dimensional CFD approach for prediction of noise reduction of mufflers without mean flow

    A CFD approach, in which the full equations are solved in the time domain, is proposed to calculate noise reduction of a cleaner and a complex exhaust muffler without mean flow. First, two modelling approaches are used to deal with the outlet boundary and to calculate noise reduction of the cleaner without a filter element. The calculated results agree quite well with measurements. Further, the ...


    By Inderscience Publishers

  • Canarina CUSTIC software · ISO 9613 · noise pollution · commands 8

    All the points of the XY-plane will be to a zr height. The zr value is chosen by the user before the calculation. We will be able to make many calculations considering different plane heights. The different plane heights will be determined by the user (zr values). In this way, the physical form of the noise power can be studied. Example: Calculation in ...

  • Quality Assurance of Environmental Noise Calculation Methods in Software

    When determining the uncertainty of an environmental noise calculation result, assessment of the quality of the implementation of the method used in the software is required. Here, Nordtest Method Framework for the Verification of Environmental Noise Calculation Software ACOU107 (2001) may prove useful. Although developed for Nordic calculation it can, in principle, be applied to all other ...

  • Creating an entire country`s noise map - Case Study

    To comply with the European Union’s Environmental Noise Directive 2002/49/EC, member states are required to create updated noise maps for large urban areas and major transportation sources every five years. The English government commissioned a single project to calculate sound levels across the whole of England which resulted in the world's biggest noise map. ...

  • Prediction of noise from track systems

    A practical approach is presented for the prediction of noise level generated by a track system at the design stage of a tracked vehicle. Rayleigh's surface integral is adopted for relating the acceleration of a track link chain in the time-domain to the radiated acoustic pressure of the exterior noise. The sound pressure levels of the noise generated by the vibrating track system are calculated ...


    By Inderscience Publishers

  • Canarina CUSTIC software · noise calculation · algorithms 3

    In a road case, we shall consider several points.  We shall consider a minimum number of 1000 vehicles per hour N with a 50km/h minimum velocity (100km/h is the maximum velocity). Then we have a 68 dB(A) noise level at 10m from a lineal road (infinity length). The noise level will be,   ...

  • Urban Noise Monitoring in Madrid

    Dynamic mapping helps Madrid improve the quality of life for her citizens and visitors alike. With its 3 000 000 inhabitants and 2500 km of streets, Madrid is an excellent example of what can be done to improve human comfort related to urban noise. Since the late 60s, Madrid City Council has been working on noise problems. During this period, global environmental analysis has focused on how ...

  • Analysis methods for the determination of possible unseated fuel assemblies in BWRs

    This paper describes noise-based methods, the purpose of which is to determine whether the core of a Boiling Water Reactor (BWR) contains unseated fuel assembly(ies) or not. The characteristic feature of an unseated fuel assembly is to render the corresponding fuel channel thermal-hydraulically unstable since some of the coolant bypasses the fuel channel. The induced neutron noise has a strong ...


    By Inderscience Publishers

  • Ready for the future with CNOSSOS-EU!

    The Environmental Noise Directive 2002/49/EC which appeared in 2002 raised the question among those who are “experts in noise” how noise mapping and noise action planning should be implemented throughout Europe. They all agreed that, in view of the completely different calculation methods in the European countries, the calculation results reached and exposure figures collected would ...


    By Wölfel Group

  • Noise Mapping in Lille

    Lille, with a population of 1091 million inhabitants is the 4th largest agglomeration in France after Paris, Lyon, and Marseille. Situated at the heart of a network of 464 km motorways connecting six European cities (Brussels, Bonn, the Hague, London, Luxembourg and Paris), the metropolis of Lille also has the densest railway network of France after Paris. Pascal Thomas and his team of 8 ...

  • Integrated noise calculation and evaluation according to the EU directive on environmental noise

    The model data for acoustic calculations already contains essential characteristics for more in depth evaluation of the results (i.e. building heights, number of storeys, or ground space per storey). With additional information such as building usage and number of inhabitants, the evaluation and graphical representation of the results can be completed with only a small increase in expense. ...


    By SoundPLAN GmbH

  • Even Better Environmental Noise - Calculation Software

    Brüel & Kjær’s Prediction Partnership now moves into a new phase with the founding of Softnoise. To celebrate this, we release new versions of the software. Softnoise Originally, Predictor™ Type 7810 was developed solely by DGMR, and Stapelfeldt developed Lima™ Type 7812. Now, DGMR and Stapelfeldt have created a common company, Softnoise, to jointly develop and support both ...

  • What is reverberation time and how it is calculated?

    What is the reverberation time of a room? Reverberation time is the time required for the sound to “fade away” or decay in a closed space. Sound in a room will repeatedly bounce off surfaces such as the floor, walls, ceiling, windows or tables. When these reflections mix, a phenomeon known as reverberation is created. Reverberation reduces when the reflections hit ...


    By Cirrus Research plc

  • Comparison of ISO 9613-2 vs Advanced Calculation Methods using Olive Tree Lab - Terrain

    Abstract The process of performing an Environmental Impact Assessment includes the study of noise propagation. Often, the path from a noise source to a noise sensitive location involves complicated mechanisms of sound transmission. These mechanisms may relate to diffraction & reflections from obstacles (natural or man made), ground properties, and meteorological conditions. The ...

  • Noise measurement in the fast lane! - case study

    Due to the nature of the Vehicle and Operator Services Agency (VOSA) work, noise is an inevitable by-product of its daily activities. Consequently to ensure the welfare of both its staff and the community in which it operates, VOSA undertakes regular noise assessments to ensure that the relevant regulations are being adhered to, thereby protecting both the environment in which it operates as well ...


    By Cirrus Research plc

  • Canarina CUSTIC software · noise mitigation · commands 7

    The program window is a XY-plane (parallel to the land surface). A noise source is represented by a small square. In the Status bar at the bottom, we have X and Y coordinate values in meters and data on our environmental system. Point the mouse where you want in the program window and the X and Y values will be shown in the status bar at the bottom. On the left bottom corner, two different text ...

  • Noise Planning Software Used to Map Major EU Roadways

    Most countries have a national noise policy to protect citizens from undesirable environmental noise levels from road, rail and air traffic and industrial sources. The European Noise Directive for the Assessment and Management of Environmental Noise outlines a coordinated method to achieve noise reduction in large cities as a first step, followed by smaller cities as a second step. The ...


    By SoundPLAN GmbH

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