| 摘要 |
A de-icing system for a hemispherical protective housing 1 mounted on an aircraft structure comprises a series of piezo-electric devices mounted at the boundary 2 of the housing 1. The piezo-electric devices generate ultrasonic frequencies and resonance of the protective housing is induced. One of the piezo-electric devices senses the frequency generated in the protective housing and acts as part of a feedback loop to maintain structural resonance of the protective housing 1. The structural resonance of the protective housing 1 prevents the build-up of ice. Additionally, higher power resonances can be generated to remove ice already built up on the protective housing 1. The system also enables detection of ice build-up on the protective housing 1 by monitoring any change in the frequency required to maintain structural resonance of the protective housing 1. |
