Reduction of Flight Control System/Structural Mode Interaction

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$70,000.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
NND05AA45C
Award Id:
72701
Agency Tracking Number:
040514
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
4030 Lake Washington Blvd NE, Suite 205, Kirkland, WA, 98033
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
883221723
Principal Investigator:
RobertStirling
(425) 827-7476
rstirling@stirling-dynamics.com
Business Contact:
DennisMessenger
Business Official
(425) 827-7476
dmessenger@stirling-dynamics.com
Research Institute:
n/a
Abstract
A novel approach is proposed for reducing the degree of interaction of a high gain flight control system with the airframe structural vibration modes, representing a complete departure from the traditional approach of using notch filters. In principle it offers similar or better performance than notch filters, while not suffering from the attendant low frequency phase lag that has an adverse effect on pilot handling qualities. Structural mode interaction can be a significant problem in high performance aircraft and other aircraft with low frequency vibration modes. Use of notch filters requires a compromise to be reached between airframe structural stability and handling qualities. Successful application of the proposed method will relieve the flight control system designer of the need for managing this compromise and will allow the achievement of full potential system performance with better handling qualities. Basic feasibility has already been established and Phase I will broadened this to cover practical implementation issues and to define test evaluation plans. Phase II will extend the method into actual test evaluation, either by laboratory test or flight test, or both. Other possible applications such as aircraft active control systems and control of space structures will be considered during the research program.

* information listed above is at the time of submission.

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