CTTM acousticians have developed and perfected a new experimental tool for the study of acoustic materials. This new "all-in-one" bench simplifies the characterization of acoustic materials and makes them more reliable. This innovation is the fruit of collaboration with the Laboratoire acoustique de Le Mans Université (Laum).
This new "JCAL Test Bench" for characterizing porous materials, made in CTTM, is, according to its designers, a unique product in the world. It uses the exceptional metrological properties of an acoustic impedance sensor originally developed for the qualification of wind instruments: its typical measurement range covers the 20Hz-6kHz frequency band.
Porous materials (foams, fibrous materials, felts, fabrics, films, concrete, etc.) have good sound absorption properties and are used to reduce noise pollution. Their acoustic performance can be simulated and optimized based on a set of intrinsic parameters linked to the material's microstructure.
Thus, with a single device, the user obtains directly all the material parameters required for a JCAL-type model: resistivity meters, porosimeters, tortuosimeters, kundt tubes, etc. can all be put to one side. The new bench also offers the added advantage of a compact footprint.
"The JCAL Test Bench can be used in all sectors where porous materials are used: construction, transport, aeronautics, audio equipment, capital goods, heating and air-conditioning equipment, medical, etc.
This innovation was presented by CTTM's acoustics experts to the NVH (Noise Vibration & Harshnes) at the Automotive NVH Comfort conference, held on October 18 and 19, 2023 at the Palais des Congrès in Le Mans.
The CTTM in a nutshell
CTTM is a research and development center for industrial innovation, a design office and an analysis and testing laboratory. Its specialist fields are: acoustics and vibration, materials, design engineering, biological and medical engineering.
CTTM is ISO 9001 certified. Its customers are SMEs, ETIs and large companies in all industrial sectors.
In response to industrial challenges, CTTM exploits the results of fundamental research and transforms them into process-appropriate products. This technology transfer capability is underpinned by close collaboration with Le Mans University, and a team of 40 engineers and technicians with European-level skills and resources.
Its Acoustics and Vibration division is a key player in this field of expertise in Le Mans, the region and far beyond. Multi-year projects to develop new skills and know-how at CTTM are supported by :