Accession Number:

AD0744491

Title:

Design Method for Fully Augmented Systems for Variable Flight Conditions.

Descriptive Note:

Final technical rept. 5 Oct 70-5 Sep 71,

Corporate Author:

HONEYWELL INC MINNEAPOLIS MINN SYSTEMS AND RESEARCH DIV

Personal Author(s):

• VanDierendonck,Albert J.

Report Date:

1972-01-01

Pagination or Media Count:

298.0

Abstract:

A practical controller design procedure for aircraft for their entire flight envelope is developed based on quadratic optimal control technology. The resulting design is an optimal gain schedule with some gains fixed and some gains variable. The procedure is applied to two example aircraft, the F4 Lateral-Direction Axes and the YF-12 Pitch Axis. Good handling qualities are a criteria for both examples. An additional criterion of minimizing accelerations due to flexure is included in the YF-12 design. The handling-quality criteria are expressed as model-following errors while the ride qualities are expressed as mean square accelerations. A computer algorithm is developed to solve this fixed-plus-variable-gain optimization problem with measurement realizability constraints. The algorithm successfully handled 11 flight conditions and 22nd-order dynamics over four flight conditions. A pole-placement algorithm is also extended to multiple flight conditions but is not applied. Author

Descriptors:

• *FLIGHT CONTROL SYSTEMS
• *JET FIGHTERS
• FLIGHT CONTROL SYSTEMS
• MATHEMATICAL MODELS
• OPTIMIZATION
• ADAPTIVE CONTROL SYSTEMS
• TRAILING CONTROL SURFACES
• AERODYNAMIC CHARACTERISTICS
• AERONAUTICS
• COMPUTER PROGRAMS

Subject Categories:

• Attack and Fighter Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE