IC², a pioneer in the development of micro-electromechanical systems (MEMS) based sensors for aerospace applications, today announced that NASA has awarded the company a new SBIR Phase I contract to develop low profile, low frequency, adaptively-tuned acoustic liners for improved noise reduction in aircraft engines.
“Though we are in the early stages of development, this technology offers the potential to improve noise reduction in aircraft engines while simultaneously reducing weight and drag compared to existing technologies. Our approach uses an adaptively-tuned smart material to maximize noise suppression under changing engine conditions. This adaptive tuning method uses very little power while offering potentially enormous performance benefits.”
Conventional approaches to aircraft engine noise reduction via passive acoustic liners are limited in performance, particularly at lower frequencies, where improvements are gained through increased liner depth. Typical engine nacelle installation clearances, however, limit liner depth and prevent further improvements in low frequency noise reduction using these conventional approaches. IC2’s technology addresses these limitations via a low-profile, tunable acoustic liner for modern aircraft engines capable of significant noise attenuation at lower frequencies than currently achievable. The innovative approach lowers the resonant frequency and enables significant reductions in cavity size and volume. Significant net weight savings is achieved due to the large reductions in cavity volume (via corresponding decreases in cavity wall surface area). The end result is lower frequency noise attenuation with simultaneous reductions in liner depth and weight.
The technology provides the following benefits for acoustic noise reduction:
- Optimum absorption of sound at frequencies half of those achievable with currently available technologies.
- Decreased liner depth
- Decreased liner weight
- In-situ, automatic tunability for optimum absorption under different engines and engine conditions.
- Broadband operation through MDOF performance and individual impedance tuning
The work will be carried out in conjunction with the University of Florida.
The Interdisciplinary Consulting Corporation (IC²) is a technology leader in miniaturized sensors and sensing systems for aerospace applications. IC² was founded in 2001 to develop high-performance, technologically disruptive instrumentation systems that enable the measurement, modeling, and control of various physical properties. IC² is currently developing products in the areas of MEMS-based instrumentation, flow control, acoustics and smart materials. Since inception, IC² has performed significant R&D in MEMS-based microphones, shear-stress sensors, and acoustic arrays, as well as active flow control and smart materials. Key personnel at IC² have significant relevant experience in piezoelectric, piezoresistive, capacitive, thermal and optical transducers, adaptive acoustic engine liners for noise reduction, active flow control, and diagnostic and prognostic system health monitoring. Development efforts span from the component level (e.g. transducers) up to full systems (e.g. sensor systems such as acoustic arrays with signal processing HW/SW).
IC²’s sensors and miniaturized instrumentation systems are designed from the ground up to meet the challenging environments of the aerospace industry.
- high-temperature, harsh environment sensors for aerospace propulsion and engine health management systems
- low-profile ultra miniaturized sensors for aeroacoustic noise and skin-friction measurement
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