In terms of research and development in acoustics, ITS's activity covers the various fields of science and technology related to the study of acoustic vibrations and concerning their production, propagation and effects, mainly for the development of simulation tools applications for applications related to soundproofing, which require specific calculation software.
The modeling of the acoustic performance of partitions - eventually multilayered, whether plane or not (being then orthotropic with different properties depending on the direction of observation), with or without bridges in the case of several shells - was the first field of investigation of the human resources of ITS in the matter of research and development, in the early 1990s.
After the - sufficiently sophisticated, as required - consideration of the properties of filling materials (as porous media), which occurred later for applications related to architectural acoustic insulation (walls and partitions in buildings), but also related to industrial acoustics (partitions for enclosures, canopies, screens, noise barrier walls, building envelopes) it came to the modeling of the acoustic performances of ducts walls (of aeraulic networks) for air conditioning systems, ventilation systems, as well as for processes (e.g. for air intake and exhaust of fans and turbo-machinery, sometimes with chimneys).
Such applications also require, in relation to thermodynamics, to fluid mechanics and in particular to aerodynamics, the prediction of the acoustic and aeraulic performances of silencers, which has long been an axis of research and development in acoustics for the human resource of ITS.
The aim is to quantify the performance of devices capable of transporting a fluid while reducing acoustic transmission in a duct, a pipe or an aperture, and moreover, the complete analysis of the sound impact of such installations also makes it necessary many other evaluations which are also the result of research and development (R&D) activities in acoustics e.g. break out noise prediction: either for straight ducts (with a rectangular section, or with a circular section - including stapled spiral ducts) of aeraulics networks, or of silencers, prediction of the acoustic performance of elbows, prediction of the reflection of the nozzles, prediction of the directivity of stacks.
In the case of silencers intended for pressurized fluid networks, many other calculations can only be carried out after significant acoustic research and development work carried out by ITS: prediction of the aerodynamic noise of regulation valves, prediction of jet noise (including the noise of safety valves), prediction of the discharge parameters of fluid networks, performance determination and dimensioning of safety valves. Flow noise must of course not be neglected, and constitute an important field of investigation, poorly covered by the modelizations presently available.
Sound propagation is also an important focus of ITS's research and development work in acoustics.
The decay (spatial or temporal) of sound in confined spaces constitutes a field of investigation whose applications are multiple: acoustic comfort in buildings, noise at work e.g. in open offices. The sound attenuation during its (outdoor) propagation in the air is of course fundamental for the studies of acoustic impact, whatever the sources of noise.
SILDIS (Sound Impact Limitation : Design for Industrialized Solutions) is a set of predictive acoustics software developed by Philippe Reynaud, based on his research and development works in acoustics, over time.