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# noise modeling software Articles

• ## Canarina CUSTIC software · noise abatement modeling · noise analysis · introduction 7

The intensity of two sounds L1 and L2 can be added in decibels with the standard equation: LdB=10 log[(p1/p0)2+[(p2/p0)2] and then, LdB=10 log[10L1/10+ 10L2/10] In this way, ...

• ## Implementing noise prediction standards in software

Software requirements in the 80's Until the 80's most consultancy projects were based on noise measurements due to complaints. As noise legislation became more strict, noise prediction became more important. New national and international noise prediction standards As there was no commercial software available many consultants started to develop their ...

• ## Canarina CUSTIC software · noise forecasting modeling · algorithms 6

References U.S. Department of Transportation Federal Highway Administration (1976) A Guide to Visual Quality in Noise Barrier Design. California Department of Transportation (1997) Technical Noise Supplement 1st Draft. Benz Kotzen and Colin English (1998) Environmental Noise Barriers: A Guide to their Acoustic and Visual ...

• ## Canarina CUSTIC software · noise and vibration modeling · introduction 6

The frequency range of sound audible to humans is approximately between 20 and 20,000 Hz. The amplitude range of sound for humans has a lower limit of 0dB, called the threshold of hearing. Sound is technically at its upper limit at 194.09 dB. Sounds begin to do damage to ears at 85 dB and sounds above approximately 130 dB. ...

• ## Canarina CUSTIC software · noise dosimeters and modeling · introduction 5

Noises are irregular and disordered vibrations including all possible frequencies. The intensity of a sound I can be expressed in decibels with the standard equation: L=10 log(I/I0) where I0 is the quietest sound most people can hear, the threshold of hearing 10-12Wm-2.  When the ratio is between ...

• ## Canarina CUSTIC software · noise pollution modeling · algorithms 1

8. Mathematical algorithms   The mathematical model that the software uses provides options to model noise emissions from a wide range of sources that might be present at industrial areas and urban areas.   The basis of the model is the linear sound propagation  equation, which is used to model simple point source emissions from vehicles, industries, aircrafts,… ...

• ## Canarina CUSTIC software · environmental noise modeling · algorithms 4

In the railway case, we shall calculate the noise level in a similar way. For airports, we shall use the next equation Leq=Leq(300m)-20Log(r/300) where Leq(300m) is the noise level at 300m from the airport. This model performs satisfactorily for simple sound ...

• ## Canarina CUSTIC software · noise barrier modeling · barriers · introduction 4

3. Noise pollution The word "noise" comes the Latin word "nausea" meaning Sea sickness. Noise is among the most pervasive pollutants today. Noise pollution can be caused by many sources including highways, vehicles, factories, engines, machine, aircraft, helicopters, industrial development and construction work. Noise negatively affects human health and well-being. Problems related to noise ...

• ## Canarina CUSTIC software · aircraft noise · airport noise · algorithms 2

For an external source, the noise level equation is   Leq=LW-20Log(r)-11dB(A)   where r is the distance and LW the source power. However, for an industrial complex, the next equation will be used: ...

• ## 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 ...

• ## 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,   ...

• ## 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 ...

• ## Canarina CUSTIC software · noise evaluations · introduction 3

We will define the environmental impact that suffers a certain region as the difference among the future environmental situation of the place, after the realization of a project, and the environmental state of the area if this project had never taken place.  The correct diagnosis of the impact demands to know all the elements implied in the environmental process. A study of ...

• ## Canarina CUSTIC software · noise barrier design · commands 1

Welcome to Canarina CUSTIC - software for noise pollution modeling. The CUSTIC Software allows you to create robust and useful numeric simulations that fully make use of the graphical user interface. This chapter show you how to sep up CUSTIC on your computer.   We can say, with a certain security that the software CUSTIC 3.2 are one of the best tools, if not the ...

• ## Canarina CUSTIC software · noise impact assessments · introduction 1

Our planet is fragile and limited as for its potential of generating the resources that the humanity requests and its capacity to absorb the residuals that we emit. The precariousness of the ecological and environmental resistance of the earth can end up threatening the humanity's development. IUICN, PNUMA, WWF and Agenda 21 plead insistently to reach the ...

• ## 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 ...

• ## Canarina CUSTIC software · impact analysis of noise · algorithms 7

References Environmental Protection Department (2000) Housing Design to Abate Traffic Noise in Hong Kong, Environmental Protection Department, Hong Kong. Environmental Protection Department (2001) Screening Structures and Building Designs against Transportation Noise in Hong Kong, Environmental ...

• ## Canarina CUSTIC software · noise impact assessments · introduction 2

2. Administration and Environmental Impact The environmental administration is based on two fundamental tools:  the planning and the evaluation of the environmental impact. These two instruments are fundamental to coordinate the human activity and to maintain the quality of the environmental resources. The process of environmental planning combines the characteristics of each ...

• ## Canarina CUSTIC software · simulation tools · noise pollution · commands 15

Print image.- This command send a pixel-by-pixel image of the program window to the printer. To print with Print image command, you must first display that information on the program window and then print with this command. This command is by far the easiest way to print from your application.  Because it may ...

• ## 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 ...

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