Noise Modelling
What is noise modelling?
Noise modelling is a process of showing different noise levels in different colours over a large area of interest, and appear like contour lines, which represent noise bandwidths, i.e. 5dBA.
However, modelling is easiest performed using noise modelling software, like CadnaA, SoundPLAN, as retrospective changes update the noise levels immediately.
Why use noise modelling?
Modelling is particular useful when modelling large areas and many noise sources; you would not model one or two point noise sources over a small area, it would be superfluous.
For what is noise modelling typically used?
A noise model is typically used for large areas as in the case of environmental noise impact assessments for many noise sources
On a construction site, in conjunction with BS 5228 Noise Control on Construction sites
Industrial noise, in conjunction with BS4142 Method for rating Industrial Nosie affecting residential and Commercial areas, as in our project example.
Railway noise, in conjunction with Calculation of railway noise (CRN)
Road noise, in conjunction with Calculation of Road Traffic Noise (CRTN)
When and where did we model noise?
Environmentally Sound most recently utilised noise modelling tools to obtain planning permission for a recycling plant to obtain planning permission to increase productivity.
After the recycle plant was estalbished in the area, a new housing development sprouted alongside the recycling facility over the last few years. Therefore, a planning application had to be submitted, as the plant could have an impact on the residential area if productivity increased.
The image at the top of this page shows a section of the noise model; housing on the left, and the recycling plant on the right.
How do you know the noise model is representative?
As in any finite element software, the constraints and assumptions made for the model, influence the results. Therefore, we measured all the noise sources on-site using BS4142 and modelled them in the SoundPLAN software.
... and we did more.
We then captured the noise levels at several locations within the residential neighbourhood to compare with the SoundPLAN model to ensure that the model was predicting the correct noise levels. These noise levels are affected by the topography of the obstacles like walls, berms and houses, hence the reason to check!
How much does noise model report cost?
The cost varies with the project, and is mainly time driven, which is dependent on the information that we have and the amount of detail that needs to be modelled. The modelling aspect of any project that we perform, is usually in the vicinity £400+VAT per day. In most of our projects, modelling typically takes a day or two. The validation and verification of the model is additional to the cost.
Where to find more information on noise modelling
If you would like more information on noise modelling and/or a quotation for a noise assessment that also requires modelling, please email us the details at info@environmentallysound.co.uk.
We shall reply with a quotation within 24 hours of receipt.