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PZT-Actuated In-Flight Deicing With Simultaneous Shear and Impulse Forces

[+] Author Affiliations
Suresh V. Venna, Y. J. Lin

University of Akron

Paper No. IMECE2004-61554, pp. 197-205; 9 pages
doi:10.1115/IMECE2004-61554
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Aerospace
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-4700-4 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

Piezoelectric actuations for simultaneous generation of shear and impulse forces for effective and energy efficient deicing applications are proposed. Aircraft leading edge structures is considered for the analysis. Adhesive shear bond between the ice layer and the substrate, which is more than ten times weaker than the normal bond, is targeted to achieve deicing. Piezoelectric actuators consisting of high normal to shear coupling factor(d15) are considered at the inner surface of the leading edge at the locations where highest amount of ice accretion is occurred. Simultaneous shear and impulse force generation can be achieved with actuators consisting of two sets of electrodes, one arranged in parallel to the poling direction and the other perpendicular to the poling direction to generate shear forces and normal forces respectively. Appropriate piezoelectric material configuration is chosen, so that enough shear forces are generated to weaken the bond of the ice-substrate interface which is weak in shear. Once the shear bond is weakened, applied normal impulses force the ice layer come off the surface. Finite element model of the leading edge structure with ice accretion layer and piezoelectric actuators are constructed. Simulations of the deicing process are performed and the actuator locations, electric charge applied and impulse duration are optimized. This method employs single actuator for both shear and impulse generation and consumes far less power than any existing in-flight deicing methods.

Copyright © 2004 by ASME

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