Extension modes have proven to provide sufficient ice-interface shear stresses, exceeding the adhesion strength of ice to the substrate and ensuring instantaneous ice delamination. A proposed proof of concept involves the utilization of lightweight piezoelectric actuators for deicing the leading edges of aircraft with minimal power requirements. This deicing method induces vibrations into the structure by activating its inherent extension resonant frequencies, thereby creating sufficient stress levels to fracture the ice and delaminate it from the surface. The deicing mechanism depends strongly on the chosen excitation mode, which depends on the actuator placement. Hard and soft piezoelectric actuators were used to excite extensional modes to generate shear stresses at the interface leading edge/ice great enough to delaminate the ice. Deicing was demonstrated with a power input density of 0.074 W/cm2 for a surface ratio of 0.07 hard piezoelectric actuators per cm2.
This contribution discusses a design rule for the piezoelectric actuators positioning for the excitation of extensional modes supported with experimentations.
The ability of a piezoelectric actuator in energy conversion is rapidly expanding in several applications. Some of these applications for which an ultrasound piezoelectric actuator can be used are surface cleaning, metal cutting and welding, and biomedical applications such as needleless drug delivery. A new application of piezoelectric actuators is the Avionic Deicing System. The working frequency of actuator is between 100 kHz and 150 kHz, depending on temperature and ice thickness, and output power levels at several hundreds of Watts. The power supply of piezoelectric actuators has to provide an output voltage of up to 200 VAC at the resonance frequency with low consumption. This article discusses and analyzes a low-consumption electromechanical deicing solution based on piezoelectric actuators, its operating principle, and its driving power supply development supported by experimentations on the setup representative of a part of the Nacelle.
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