Additive Manufacturing for Advanced and Sustainable Sound Control Systems

建筑吸声技术往往受到以多孔材料、振动板和穿孔材料为代表的传统技术的限制。在现有技术下，要广泛吸收中频噪声，通常需要大厚度的多孔材料。由于这造成了空间问题，因此对薄型宽频吸振器有**需求。产生被动破坏性干扰的可能性，这是主动噪声控制中通常使用的**原理，最近在创新的吸声**处理中被考虑。当两个相互干扰的声波处于反相时，就会发生相消干涉。该项目旨在开发一种使用被动破坏性干涉管的声学面板。新的声学面板**将由一系列管子组成，这些管子的长度和直径将根据要**吸收的频率来定义。每个面板中将组装几个无源谐振器，以实现宽频吸收。**项目旨在通过加法制造开发和研究各种原型方法，在拥有设计生成的**编码规则之后。由于这项工作涉及高度复杂的几何图形，数字制造**将使设计自由。目标小组的另一个必要特征将是其透明度。这种**特性能够获得一种可以悬挂在空间内或安装到内部玻璃**隔板中而不会阻止光线透射性的面板。WIREP和研究团队将比较不同的添加剂**制造技术和几种透明的ABS和树脂。其目标是生产新的1mx1m面板，以**进一步支持公司在室内声学新吸声方法方面的领先地位。

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.**