I-Corps: Quiet car wheel technology

I-Corps项目的更广泛影响/商业潜力是开发新的策略，利用高反射声学超材料隔离轮胎与路面摩擦引起的车辆内部噪声。拟议项目的一个广泛影响是在车辆的噪音，振动和舒适性方面进行范式转变。这项技术是一种元表面，可以用来控制和隔离行驶中的汽车产生的声音。提议的声学超材料部分填充轮胎内部，从而将它们与汽车座舱隔离开。所提出的设计显著降低了在较宽的车速范围内，在低于2 kHz的声频下，轮胎与路面相互作用所产生的噪音。坚固的轻质元结构提供了大量的内部噪音降低和舒适的驾驶体验，而不影响轮胎性能。考虑到不断增长的汽车市场规模，拟议中的技术可以成为本地和全球经济增长的催化剂。提出的安静技术可以帮助解决其他领域现有的环境噪音污染，并可能最终对健康产生长期影响，包括焦虑、抑郁和心脏病。这个I-Corps项目是基于汽车噪声污染降低技术的发展。这种噪音通常来自轮胎与路面的相互作用，例如摩擦和撞击。目前的努力目标是使用吸声器和/或腔谐振器来抑制噪声谱中的峰值。实现这一目标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腔共振，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声音和轮胎-路面相互作用引起的宽带噪声，需要一种不同的方法。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的宽带声音，该项目将使用声学超材料和人工工程结构，这些材料可以具有紧凑的形状，同时提供奇异的声学特性。提出的方法使用人工设计的反射声，可以扩展到产生低频机械噪声的其他物体。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值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.