In an overview the noise and vibration problems of a helicopter are discussed with respect to the major sources and the regions most seriously affected. The helicopter main rotor is identified for playing a dominant role under these aspects. Therefore it is analyzed concerning its noise and vibration generating mechanisms in further detail. Subsequently the different passive, active, and adaptive concepts for suppression, respectively reduction are surveyed. Due to its conceptual advantages with a high degree of structural integration the adaptive blade twist with piezoelectric fiber composites to provide the actuation authority is chosen for a close-up examination and is presented through the sequencing modeling steps.
Adaptive concepts to reduce noise and vibrations of helicopter rotors
2002
15 Seiten, 13 Bilder, 16 Quellen
Conference paper
English
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