The approach of acoustic engineering
In order to reach the table presented above has been previously provided the following information, on estimated quantities and cost statements:
This map was based on the specification of necessary reductions:
This specification was made based on a previously conducted model, with sources of hierarchy in terms of contributions in the receptor points.
The model consists of a previously conducted noise map such as that seen following:
The development of techniques for modeling sound propagation issue and, alongside the increasing capacity of memory and calculation computer systems, allowed the emergence of software capable of modeling, with good accuracy and relatively quickly, the most complex situations generation and noise propagation. The results are typically presented in the form of equal loudness lines and / or colored stains, representing the areas where the noise level is situated in a given range of values, in other words: "Noise maps".
These noise maps do not result directly from noise measurements - for this to be possible with a minimum level of representativeness, would require hundreds, or even thousands, measurements, with durations of several days for each measurement point. They result rather from the calculations made according to a mathematical model.
Since the publication of the Green Paper (1996) gives “Future Noise Policy for EU” it was clearly established that, at Community level, all environmental noise policy will be based on the noise maps, inserted in geographic information systems and considered as an essential tool of urban planning, municipal e regional.
In October 2001, to DGA (Directorate General for the Environment) together with DGOTDU (Directorate General for Spatial Planning and Urban Development) issued a document with guidelines for the noise maps Elaboration, It is noted that these environmental management tools should be integrated into PMOTs, PDMS, PUs is PPs.
The preparation of this map is made based on the methodology described schematically in the following figure.
The use of acoustic modeling software factories is and will increasingly be an essential tool for the identification of industrial noise problems, enhancing action plans optimized, minimizing investment, with guaranteed results, and allowing a true Environmental Noise Management. The ability to simulate different noise scenarios (ex.: simulation of the noise produced by a new assembly line) before implementation can avoid future disappointments, allowing better planning and cost reduction, in addition to strengthening the company's image in the society. Increasingly the advantages of this methodology are used by companies to Environmental Noise Management.
Below you can see a presentation on this topic.