Accession Number:

ADP011138

Title:

Offset Piezoceramic Stack Actuators and Acceleration Feedback Control for Tail Buffet Alleviation of a High Performance Twin Tail Aircraft: Robustness Issues

Descriptive Note:

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OFAEROSPACE ENGINEERING

Personal Author(s):

Report Date:

2001-06-01

Pagination or Media Count:

12.0

Abstract:

In high performance twin-tail aircraft tail buffet occurs when unsteady pressures associated with separated flow excite the modes of the vertical fin structural assemblies At high angles of attack flow separates and is convected by the geometry of the wing-fuselage interface toward the vertical tails. This phenomenon. along with the aeroelastic coupling of the tail structural assembly results in vibrations that can shorten the fatigue life of the empennage assembly and limit the flight envelope due to the large amplitude of the fin vibrations The objective of this paper is to present a control system for buffet alleviation by the use of Offset Piezoceramic Stack Actuators OPSA in combination with acceleration feedback control. The emphasis of this paper is placed on the reliability and maintainability of the actuator and the robustness of the controller. The choice of actuator and controller is justified Methods for the design and the placement of the OPSAs for tail buffet alleviation are elaborated. A method to design the acceleration feedback controller for tail buffet alleviation is presented. Finally experimental validations of the effectiveness and the robustness of the controller tire performed on a full- scale vertical tail sub-assembly and on a ll6th scale wind tunnel model.

Subject Categories:

  • Aerodynamics
  • Attack and Fighter Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE