Memo on Writing a Report on Smart Systems

There are economic and technology opportunities simply waiting for the right group to capitalize on them. I am the individual who can lead that charge. Consider the potential applications of smart systems to control and modify local flowfields (Smith, 1998, 269-283). This offers interesting opportunities for improving the performance and/or operability of subsonic transports. These possibilities exist in both the private and governmental sectors (Advanced development of next actuators..., 2000).

The real world challenges to develop cost effective, low risk smart systems should be presented from the airframers perspective (Ashley, 1998). Possible flow control applications for cruise drag reduction, separation control, improved aircraft controllability, loads alleviation, noise control and improved propulsion system efficiency should be pursued (Robinson, 1997).

The potential applications areas for these emerging smart technologies include laminar flow control, active shaping, delay of buffet onset, flap system separation and flow reversals, nacelle induced flow separations, actuateable flow control devices, and variable area exhaust nozzles (ARO in Review, 199

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use piezoelectric and electrostrictive materials generally offer higher strain and forces while consuming less power. This fundamental disadvantage has recently changed with the development of the so-called giant magnetostrictors, namely Terfenol-D. These materials are able to strain an order of magnitude more than conventional piezoceramics with comparable force outputs (Kannan, & Dasgupta, 1994, 21-28). The most promising magnetostrictive candidate material currently available is Terfenol-D, an alloy of iron and the rare earth elements, Terbium, and Dysprosium. Terfenol-D is known as a giant magnetostrictive material because strains of 1400 me are possible when a rod of material is exposed to a magnetic field on the order of 1000 Oersted. Passing an alternating current through a solenoid coil wrapped around a rod of Terfenol-D is a simple technique for applying bi-directional magnetic fields to the rod (Calkins, Zrostlik, Flatau, and Vogel, 1994, 267-173). Commercially available actuators have total displacement capabilities of 0.1% (100 me), are capable of producing output forces of 1750N, and operate at frequencies up to 20,000 Hz. Terfenol-D transducers have been successfully used as positioners, sonar projectors (500-20
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Approximate Word count = 5725
Approximate Pages = 23 (250 words per page)