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flutter
- Definição1
- Flutter is an instability type of phenomenon involving a self excited oscillatory system and its occurrence is dependent upon the interrelationship of the aerodynamic forces, inertia forces and elastic forces of the system.
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual of aircraft accident and incident investigation. Part III: investigation. Montreal, 2011. (Doc. 9756 AN/965).
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Annex 8 to the Convention on International Civil Aviation: airworthiness of aircraft. 11th ed. Montreal, 2010. (Annex 8).
- Nota adicional1
- When flutter does occur the amplitude of the oscillation may build up and extremely high loads may develop, resulting generally in structural failure of the aircraft or one of its components. For this reason, flutter can be considered as a special variation of excessive loading and can be handled by the investigator in the same general manner as for that category of failure. Modern aircraft are designed and tested during certification to avoid the possibility of flutter in normal use. However, flutter can occur in service, if the original design or component stiffness is altered by repair or modification work or if excessive free play develops.
- Contexto
- Each part of the helicopter structure shall be free from excessive vibration or oscillation (ground resonance, flutter, etc.) under each appropriate speed and power condition.
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