Acoustic Design and Simulation for indoor and outdoor spaces
Predicting the sound field in spaces in the build environment, both indoors and outdoors, is of high importance in the field of acoustics, both in design and construction environments. In the industry, prediction methods are indispensable, for example in the development of acoustic related products. Also, predicting the acoustic performance of spaces by utilizing simulation tools is a widely used approach being favoured over time-costly scale model studies. In acoustic design environments, predicting methods are used to develop new concepts of buildings, or building elements, to create acoustics protecting humans against adverse health effects and promoting well-being, performance (e.g. in working environments) as well as the acoustic quality of performance spaces like concert halls.
Nowadays , a major challenge for the development of acoustic prediction methods is generating a realistic and real-time auralization of spaces. The acoustic performance of space has, for a long time, been evaluated by metrics related to amongst others the equivalent sound pressure level, and the decay of the sound level in a space over time. The perceptual appreciation of a sound environment cannot be captured by such metrices only. Time dependent effects, such as the effect of moving source and/or receiver and arising associations related to the nature of the source of the sound field determine how subject perceive it. To support the design of perceptual evaluation of sound fields, prediction methods realistically computing the time-dependent sound field are therefore incredibly important. A design thread receiving much attention in this respect soundscaping. In noise control, soundscaping implies that a positive sound field is strived for, whereby the sound field is composed of both natural and human-made sounds. Besides being supportive for perceptual design, auralization methods are also useful as a design tool for buildings, and in the communication of noise control measures to the public in an environmental setting (how doe it sound in your back garden when a noise screen will be erected ?).
Whether inside buildings or in city centres, sound and vibration waves are key challenges for the quality and comfort of living spaces. We deploys analysis methods that are both digital and experimental, at all levels (from the microscopic structure of materials to the urban scale) combined with considerable expertise to help all contributors to sustainable development (developers, manufacturers, architecture firms, etc.) deal with their most complex challenges: urban sound environment, inconvenience caused by underground worksites, complex multilayer systems, intelligibility in spaces…
Acoustic comfort, acoustic performance, regulatory compliance: meeting these requirements means determining the acoustic characteristics of materials and components in structures (buildings, urban and transportation infrastructure). We use special acoustic simulation software set (AcouBAT, AcouSYS, MithraSound and MithraSIG) that’s developed by CSTB which has at its disposal a large set of calculations and tests to characterize the acoustic and vibration performance of all types of products and systems of the building industry. Our advanced expertise tools :
- Analysis of complex innovative acoustic systems
Predicting the acoustic efficiency of innovative developments, such as green walls and urban noise-control systems / Developing hybrid methods for complex situations
- Realistic and spatialized rendering (3D) of complex sound environments
realistic real-time synthesis of engine sounds (internal combustion engine vehicles, airplane reactors, etc.) / Physical synthesis and realistic real-time 3D audio rendering of urban sound environments and indoor environments / Combination with digital models
- Propagation of environmental vibrations and combination with buildings
vibrations produced by underground transportation channels (tunnels) / Vibratory propagation in the ground / Prediction of the interaction between the ground and the building, using the hybrid method
- Prediction of structure-borne noise in structures
- Acoustic adaptation of performance halls: Carmen electroacoustic system
Reference: Building/City Information Model for Simulation and Data Management T. Delval, A. Jolibois, S. Carré, S. Aguinaga, A. Mailhac, A. Brachet, J. Soula, S. Deom, HAL Id: hal-02201997, https://hal-cstb.archives-ouvertes.fr/hal-02201997v2, 22 Aug 2019