I-Corps: Quiet car wheel technology

这个i-Corps项目的更广泛的影响/商业潜力是开发新的战略，利用高反射声学超材料对轮胎在路面上摩擦引起的车辆内部噪音进行隔声。拟议项目的一个广泛影响是改变了车辆的噪音、振动和舒适性。这项技术是一种亚表面，可以用来控制和隔离行驶中的汽车产生的声音。所提出的超声学材料部分填充了轮胎的内部，从而将轮胎与汽车驾驶舱隔音。建议的设计显著降低了在低于2 kHz的声频下，在很大的车速范围内，轮胎与路面相互作用产生的噪音。坚固、轻便的亚结构提供了大量的内部噪音降低和舒适的驾驶体验，而不会影响轮胎的性能。考虑到不断增长的汽车市场规模，拟议的技术可以成为当地和全球经济增长的催化剂。拟议的安静技术可以帮助解决其他领域现有的环境噪声污染，并最终可能对健康产生长期影响，包括焦虑、抑郁和心脏病。这个i-Corps项目是基于汽车降噪技术的开发。这种噪声通常来自轮胎-路面的相互作用，例如摩擦和冲击。目前的努力目标是使用吸音器和/或空腔谐振器来抑制噪声频谱中的峰值。为实现这一目标而应用的工具是声学泡沫和亥姆霍兹谐振器。然而，这些降噪方法主要集中在抑制轮胎的空腔共振上，并且在相对较窄的带宽内有效。为了更好地降低低频产生的噪声和轮胎-路面相互作用引起的宽带噪声，需要一种不同的方法。虽然由于有限的设计限制，使用传统材料很难处理低频和不希望看到的宽带声音，但该项目将使用声学超材料和人工工程结构，这些结构可以具有紧凑的形状，同时提供异国情调的声学特性。建议的方法使用了人工设计的反射声学，可以扩展到其他产生低频机械噪音的物体。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

The broader impact/commercial potential of this I-Corps project is the development of new strategies for sound isolation for vehicle interior noise induced by the friction of tires on pavement using highly reflecting acoustic metamaterials. One broad impact of the proposed project is to make a paradigm shift in the noise, vibration, comfort of vehicles. This technology is a meta-surface which can be used to control and isolate sound generated by a moving car. The proposed acoustic metamaterial partially fills the interior of the tires, thus isolating them acoustically from the car cabin. The proposed design significantly reduces the noise arising from tire-pavement interaction at a wide range of vehicle speeds over acoustic frequencies below 2 kHz. Robust lightweight meta-structures provide substantial interior noise reduction and a comfortable driving experience without affecting tire performance. Considering the growing automotive market size, the proposed technology can be a catalyst for economic growth both locally and globally. The proposed quiet technology can help solve the existing environmental noise pollution in other fields and may, ultimately, have long-term impacts on health including anxiety, depression, and heart diseases.This I-Corps project is based on the development of automotive vehicle noise pollution reduction technology. This noise often comes from tire-pavement interaction, e.g., friction and impact. Currently efforts aim to use sound absorbers and/or cavity resonators to suppress peaks in the noise spectrum. The tools applied to reach this goal are acoustic foams and Helmholtz resonators. However, these noise reduction methods are focused on suppression of the tire cavity resonance, and they are effective within a relatively narrow bandwidth. A different approach is necessary for better noise reduction of the sound generated at low frequency and the wideband noise caused by tire-pavement interaction. While it is difficult to deal with the low frequency and undesired broadband sound using conventional materials due to the limited design constraints, this project will use acoustic metamaterials and artificially engineered structures that can have a compact shape while providing exotic acoustic properties. The proposed approach uses an artificially designed, reflecting acoustic can be extended to other objects generating low-frequency mechanical noise.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.