The Influence of Accreted Ice on a Test Specimen on Its Natural Frequencies,Eigenmodes and Its Importance for a Vibration-Based De-Icing System
In this paper a mechanical de-icing system is presented.The system is based on structural vibrations of unstiffened wing sections.By means of an actuator the skin of a flat plate test specimen is excited at its natural frequencies.When the initiated stresses exceed the bond strength between accreted ice and surface,the ice is shed off.Tests have shown the feasibility of this concept for both flat aluminum and CFRP plates as well as for a GFRP NACA0012 profile.To excite the system in its natural frequencies and to understand the de-icing process,further investigations regarding the influence of the accreted ice are necessary.Therefore,investigations on a flat plate test specimen are performed.The two sided clamped plate is excited with four piezoelectric actuators applied at the four corners on one face of the plate.The face without actuators is iced in an icing wind tunnel under different icing conditions e.g.temperature and icing time.Further experiments are performed to validate an FE-Model.Therefore,a different plate is used without any actuators applied.The plate is iced in the icing wind tunnel as well.After icing,the plate is excited at free boundary conditions with an electrodynamic exciter and investigated with a scanning laser vibrometer to determine the icing-influence on the eigenmodes.The FE-Model is used to simulate the icing-influence on the resonance frequencies,the eigenmodes of the plate and,if possible,to determine an eigenmode-selection criterion for the de-icing system.
de-icing mechanical de-icing electro-mechanical de-icing icing effect
Matthias Endres Bernd-Christian H(o)lscher Michael Sinapius
Institute of Adaptronics and Function Integration,Technische Universit(a)t Braunschweig Braunschweig,Germany
国际会议
重庆
英文
1-6
2017-09-25（万方平台首次上网日期，不代表论文的发表时间）