Consortium only

Concept and objectives

The European Commission clearly addresses transport noise through its 2002/49/EC Directive, known as Environmental Noise Directive (END).  END's objective is to encourage environmental noise reduction, and within its framework, surface transport is one of the main targets. However, with EC expected impacts of noise reduction of about 10 to 20 dB, it is evident that no action limited to a single step of the whole noise problem could obtain such reduction in noise values, therefore it is crucial to act (and optimise the means of action) at all the consecutive steps of the whole process (sound emission, sound propagation, and sound reception).
With regards to sound propagation, ground transport Noise Reducing Devices (NRD’s) do play an important role. However, depending on numerous different factors, their global effectiveness could be as low as a few decibels (if used inadequately), or reaching up to 20 dB (while using appropriate design).

The main idea of QUIESST is to optimise the knowledge, the methods, the use and the global effectiveness of the ground transport NRD, in order to foster a durable and sustainable development of transport.

The global NRD performance depends on:
  • the initial intrinsic acoustic characteristics of the industrial products used, and the long-term durability of those characteristics;
  • their relevant design (intrinsic acoustic performances, flat /non flat - homogeneous / heterogeneous devices, dimensions and location) in function of the vehicles, the infrastructure and the concerned environment;
  • the whole sound propagation process: intrinsic performances which directly affect the near field propagation could affect the far field performances in a complete different way (remember that END can lead to more stringent noise reduction criteria, leading to more and more distant affected areas),

QUIESST will merge, for the very first time, the consideration of the NRD's intrinsic and extrinsic acoustic characteristics, together with their sustainability. This innovative holistic approach will allow to control the actual global effectiveness, to reduce ground transport noise, to minimise the number of exposed people to noise, to reduce the level of noise exposure and to make NRD more sustainable.