Abstract
The use of a special type of smart material, known as active constrained layer (ACL) damping, is investigated for improved rotor aeromechanical stability. The rotor blade load-carrying member is modeled using a composite box beam with arbitrary wall thickness. Segmented ACLs are surface bonded to the upper and lower surfaces of the box beam to provide passive damping. A finite element model based on a hybrid displacement theory is used to accurately capture the transverse shear effects in the composite primary structure and the viscoelastic and the piezoelectric layers within ACL. Detailed numerical studies are presented to assess the influence of the number of actuators and their locations for aeromechanical stability analysis. Ground and air resonance analysis models are implemented in the rotor blade built around the composite box beam with segmented ACLs. An equivalent two-dimensional ground resonance model and an air resonance model are used in rotor-body coupled stability analysis. The Pitt dynamic inflow model is used in air resonance analysis under hover condition. Results indicate that the surface bonded ACLs significantly increase rotor lead-lag regressive modal damping and flap modal damping in the coupled rotor-body system.
| Original language | English (US) |
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| Title of host publication | Annual Forum Proceedings - American Helicopter Society |
| Publisher | American Helicopter Soc |
| Pages | 2228-2239 |
| Number of pages | 12 |
| Volume | 2 |
| State | Published - 1999 |
| Event | Proceedings of the 1999 55th Annual Forum of the American Helicopter Society, FORUM 55 - Montreal, Que., Can Duration: May 25 1999 → May 27 1999 |
Other
| Other | Proceedings of the 1999 55th Annual Forum of the American Helicopter Society, FORUM 55 |
|---|---|
| City | Montreal, Que., Can |
| Period | 5/25/99 → 5/27/99 |
ASJC Scopus subject areas
- Aerospace Engineering
- Transportation