Additive Manufacturing for Advanced and Sustainable Sound Control Systems

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Architectural sound-absorbing technologies are often constrained by traditional techniques represented by porous**materials, vibrating panels and perforated ones. With the available technologies, the broad absorption of middle**frequency noises typically requires large thicknesses of POROUS materials. As this creates space issues, there is a**demand for thin broad frequency absorbers. The possibility to generate passively destructive interferences, a**principle generally used in active noise control, has been recently considered in innovative soundabsorbing**treatments. A destructive interference occurs when two interfering sound waves are in counter-phase. This**project aims to develop an acoustic panel using passive destructive interference tubes. The new acoustic panel**will be composed by a SERIES of tubes, whose length and diameter will be defined according to the frequency to**absorb. Several passive resonators will be assembled into each panel for a broad-frequency absorption. The**project aims to develop and investigate various prototyping methods via additive manufacturing, after having**encoding rules for the design generation. As the work deals with highly complex geometries, digital fabrication**will enable design freedom. Another required characteristics of the targeted panel will be its transparency. This**characteristic enables to obtain a panel that can be suspended within a space or mounted into interior glazed**partitions without stopping light transmissibility. WIREP and the research team will compare different additive**manufacturing techniques and several transparent ABS and resins. The aim is to produce new 1mx1m panels to**support further the company leadership in new sound absorbing approaches for room acoustics.**