Environment and Cities

Environmental and urban acoustics is a major research axis since road, railway and air traffic volumes are still very important in Europe. In addition to that, noise annoyance problems due to human activities in cities are also significant... Concern in the middle of which is the human being. The Acoustics and Lighting Department of CSTB has been working for more than 40 years on theoretical and experimental prediction of outdoor sound propagation, in open as well as dense urban areas. One main current preoccupation is to more accurately predict urban sounds and to propose innovative solutions of control when annoying. To this end, the Acoustics and Lighting Department of CSTB focuses its research activities on five main themes:

  • The development of prediction numerical codes, used as reference and able to take into account the main sound propagation phenomena which occur outdoors (ground, buildings, meteorological conditions...),
Long range infra-sound propagation with meteorological effects (ATMOS Software)
  • The development of engineering models capable of translating these physical phenomena into simple principles that can in particular be applied in the frame of the Environmental Noise Directive 2002/49/EC,
MITHRA-SIG software : environnemental noise prediction
  • The optimisation of complex-shaped noise reducing devices (NRD) such as non-flat barriers, louvered road covers, low height protections, earth berms..., as well as the theoretical and experimental assessment of their acoustical performances,

Experimental (1/10 scale model) and theoretical (MICADO software) assessment of acoustical performance of louvered road covers

  • The improvement of innovative 3D sound reproduction (auralization) using appropriate restitution systems (headphone, ambisony, holophony...) and giving the possibility to people to “listen” to the soundscape of urban projects by “virtual soundwalks” and to express how they perceive this planned environment,
3D sound restitution (without and with low-height barrier)

With noise barrier

Without noise barrier

 

 

  • The development of new “dynamic” noise indicators able to capture the characteristics of urban soundscapes (roughness, rhythm, quietness...) from simulated time evolutions of the outdoor sound level.

The final objective is to propose and assess innovative noise control solutions and to create urban areas with a minimum of sound comfort.

Prediction softwares: MITHRA, MITHRA-SIG, MICADO, ATMOS, NOLITA, OASIS, ICARE

Some recent or current projects:  HOSANNA, QUIESST, CITEDYNE, PLUME, HARMONOISE, IMAGINE, ALPNAP…

French partners: IFSTTAR, ECL, ENTPE, CETE de Lyon, LAUM, ENPC, CERTU, SETRA, GEOMOD, ACOUCITE, CETE de l’Est, CHU de Besançon, Universités de Cergy-Pontoise, Grenoble, Paris VI…

European partners: Open U, Chalmers U, TNO, A-Tech, BASt, Müller-BBM, Canevaflor, Universités de Bradford, Sheffield, Gent, Stockholm, Bologne…

Contact

Jérôme DEFRANCE

Tél : +33 (0)4 76 76 25 35

Email : jerome.defrance@cstb.fr