In this paper, a remote local and global sensing and control of aerospace structures using advanced polymeric smart materials, MEMS (microelectromechanical systems) and built-in antennas is presented. The sensors are fabricated with interdigital transducers printed on a piezoelectric polymer. They in turn are mounted onto an ultra thin Penn State's RF antenna (patent filed). The sensors are designed to measure both pressure and shear of the fluid flown on aerospace structures. The wave form measurements may be monitored at a remote location either at the cockpit or elsewhere via the antennas in the sensors and an outside antenna. The integrated MEMS actuators which comprise of cantilever-, diaphragm- and microbridge-based MEMS with suitable smart electronics etched onto the structure are controlled by the built-in antennas through feedback and feedforward architecture. The integration of such materials and smart electronics into the skin of airfoil is ideal for sensing and controlling drag. The basic idea of this concept involves detection of the point of transition from laminar to turbulent flow and transmitting acoustical energy into the boundary layer so that the low energy fluid particles accelerate in the transverse direction and mix with the high energy flow outside of the boundary layer. The control of drag using active microriblets using MEMS technology was presented at the Session 2, Aircraft Applications, in this year SPIE Smart Structures and Integrated Systems Conference. The use of the present smart materials and electronics for active noise control and EMI suppression in aircrafts and helicopters is also outlined.
Smart electronics with interdigital electrodes, antennas, and MEMS for aerospace structures
Intelligente Elektronik mit Interdigitalelektroden, Antennen und mikroelektromechanischen Sensoren für Luft- und Raumfahrtstrukturen
1995
9 Seiten, 4 Bilder
Aufsatz (Konferenz)
Englisch
Smart electronics ans MEMS for aerospace structures
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