I-Corps: Quiet car wheel technology

该I-Corps项目更广泛的影响/商业潜力是开发新的隔音策略，用于使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声进行隔音。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。该技术是一种元表面，可用于控制和隔离由移动的汽车产生的声音。所提出的声学超材料部分填充轮胎的内部，从而将它们与车厢声学隔离。所提出的设计显着降低了噪声所产生的轮胎路面的相互作用，在很宽的范围内的车辆速度超过声波频率低于2千赫。坚固的轻量化元结构可显著降低车内噪音，并在不影响轮胎性能的情况下提供舒适的驾驶体验。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。提出的静音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项目是基于汽车噪音污染降低技术的开发。这种噪声通常来自轮胎-路面相互作用，例如，摩擦和冲击。目前的努力旨在使用吸声器和/或空腔谐振器来抑制噪声频谱中的峰值。用于实现这一目标的工具是声学泡沫和亥姆霍兹共振器。然而，这些降噪方法集中于抑制轮胎空腔共振，并且它们在相对窄的带宽内有效。一种不同的方法是必要的，以更好地降低噪音的声音产生的低频和宽带噪声所造成的轮胎路面相互作用。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受欢迎的宽带声音，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，同时提供奇异的声学特性。建议的方法使用人工设计，反射声可以扩展到其他物体产生低频机械噪声。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

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.