SBIR Phase I: Realizing Broadband Frequency Sound Absorption in Micro-Slit Panels

这个小型企业创新研究第一阶段项目旨在开发在较宽频率范围内有效的微缝面板(MSP)吸音器。MSP吸收器是可回收的、不可燃烧的和环保的。泡沫塑料和纤维等传统的吸收剂会随着时间的推移而变质，并捕获石油和其他污染物。另一方面，MSP吸音器是由铝和塑料制成的，由于亚毫米大小的气孔中的粘性摩擦，声音被衰减。面板与坚硬的表面分开，当缝隙中的声粒子速度较高时，面板最有效。以前的工作已经证明了这种材料在特定频段内的可行性。然而，MSP吸振器需要在更宽的频率范围内有效，才能在更广泛的应用中使用。这项拟议工作的目标是进行测量和数值模拟研究，旨在通过改变面板上的狭缝大小和孔隙率，以及通过设计可以放置在面板后面的基板来改善MSP的性能。预计开发的MSP吸波材料将在许多商业应用中取代泡沫和纤维。该项目更广泛的影响/商业潜力将是开发优于传统玻璃纤维和泡沫吸波材料的微缝板(MSP)吸波材料。如果被建筑界接受，对该产品潜在数量的保守估计将是每年2000万平方英尺。应用领域将包括机场、火车站、公共汽车终点站的天花板甲板面板，以及商业建筑的声学管道。这些产品在健康和食品加工行业将特别有利，因为它们可以消毒和清洁。这些材料还将因其重量轻和可回收而使汽车行业受益。典型的汽车有超过50公斤的吸音或振动材料。使用MSP减震器将减轻这一重量，提高燃油经济性。

This Small Business Innovation Research Phase I project is aimed at developing micro-slit panel (MSP) sound absorbers that are effective over broad frequency ranges. MSP absorbers are reclaimable, non-combustible, and environmentally friendly. Traditional absorbers like foams and fibers deteriorate over time and trap oil and other contaminants. On the other hand, MSP absorbers are made from aluminum and plastic, with sound being attenuated due to viscous friction in the sub-millimeter size pores. The panels are separated from a hard surface and are most effective when the acoustic particle velocity is high in the slits. Previous work has demonstrated the viability of the materials in particular frequency bands. However, MSP absorbers will need to be effective over a broader frequency range in order for them to be used in a wider range of applications. The goal of the proposed work is to conduct measurement and numerical simulation studies aimed at improving the MSP performance by varying the slit size and porosity across a panel, and by designing a substrate that can be placed behind the panel. It is anticipated that the developed MSP absorbers will replace foams and fibers in many commercial applications.The broader impact/commercial potential of this project will be the development micro-slit panel (MSP) absorbers that are superior to traditional fiberglass and foam absorbers. Conservative estimates for the potential volume of the product, if it were to be accepted by the architectural community, would be 20 million square feet per year. Areas of application would include ceiling deck panels in airports, train stations, bus terminals, and acoustical ducting in commercial buildings. These products would be especially advantageous in the health and food processing industries because they can be sterilized and cleaned. The materials would also benefit the automotive industry due to their light weight and reclaimability. Typical automobiles have over 50 kg of sound or vibration absorbing material. Using MSP absorbers would reduce this weight, improving fuel economy.