Noise reduction is imperative in many contexts.
In industry, worker’s exposure to noise is a risk that needs to be taken into account, even if only in relation to the consequences for their health.
In the case of a daily noise exposure level above 85 dB (A) and / or a peak sound pressure level above 137 dB (C), noise reduction (e.g. from production machinery and equipment) can be possible ways forward, since the actions to be considered are as follows, pursuant to Decree No. 2006-892 of 19 July 2006 on safety and health requirements applicable in case of exposure workers to the risks arising from noise and amending the Labor Code transposing Directive 2003/10 / EC into French law:
- implementation of a program of technical measures to reduce noise exposure
- noisy workplace signaling & access limitation
- use of hearing protectors
- periodic audiometric examinations (enhanced medical surveillance)
The installation of soundproof canopies, sound enclosures can therefore have its place when it comes to reducing noise at the source, the interposition of acoustic screens being able to be useful when it comes to oppose the propagation of noise, and the installation of absorbent materials suspended under the roof or on the walls being appropriate to reduce the reverberation of noise on the walls of a work space.
In the environment, noise emissions are, for the neighborhood, a possible nuisance that manufacturers should ideally prevent, and at least treat not to cause emergence in the surrounding soundscape that would lead them to be in a situation of non-compliance, with respect to the Decree of 23/01/97 relating to the limitation of noise emitted into the environment by facilities classified for the protection of the environment.
For the period 7 am - 10 pm (except Sundays and public holidays), the permissible emergence is 6 dB (A) for an ambient noise level between 35 dB (A) and 45 dB (A) and 5 dB ( A) for an ambient noise level greater than 45 dB (A).
For the period 22h - 7h (and for Sundays & public holidays), the admissible emergence is 4 dB (A) for an ambient noise level between 35 dB (A) and 45 dB (A) and 3 dB (A) for an ambient noise level greater than 45 dB (A).
To be in accordance with the permissible emergence, various noise reduction devices can be envisaged such as sound-absorbing hoods, silencers, noise barriers.
ITS studies and markets all noise reduction solutions in industrial area and for environment.
The starting point of an approach for noise reduction approach in an industrial environment and for environment can be a campaign of measurements on site (by ITS or by others) showing noise levels higher than the admissible limits.
A necessary step is the study (by ITS) of the feasibility and effectiveness of actions to improve the situation observed: selection of materials and soundproofing devices (with the appropriate functionalities in terms of noise reduction as can be simulated by ITS and with respect to other related considerations (technical, financial) which, then, can be marketed by ITS with a guaranteed result ; as in many other fields: experience matters, and ITS human resources have it !