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Design and Evaluation of Control Laws for the X-31A with Reduced Vertical Tail

Steinhauser, R. and Looye, G. and Brieger, O. (2004) Design and Evaluation of Control Laws for the X-31A with Reduced Vertical Tail. AIAA-2004-5031, Proc. of AIAA Guidance, Navigation, and Control Conference and Exhibit, Providence, Rhode Island, USA, August 16-19.

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Abstract

The characteristics of the thrust-vectored X-31A aircraft with reduced vertical tail were investigated as one of the key research objectives within the German-American VECTOR program. This paper describes the design of the flight control laws for this modified configuration of the X-31A using Nonlinear Dynamic Inversion (NDI), as well as the subsequent handling qualities evaluation in the flight simulator. NDI is based on the inversion of model equations, so that control laws are easily adapted to varying aircraft configurations and, as will be shown in this paper, may be generated automatically with the help of advanced modeling tools. Initially, the NDI control laws for the original X-31A aircraft configuration with full vertical stabilizer were developed in an off-line design phase. Next, the aerodynamic database of the simulator model was supplemented with data from wind tunnel measurements with 30 % and 50 % of the vertical tail removed. Based on the updated simulation model, the control laws were automatically re-generated and implemented in the VECTOR fixed-base flight simulator facility. Six experienced pilots assessed and compared flying qualities (for conventional as well as post-stall flight conditions) for full and 50% tail configurations. In general, Level 1 flying qualities were achieved for both configurations. However, with the tail (including rudder) reduced, controllability limits were reached at lower thrust levels due to the deteriorating thrust vectoring control effectiveness

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Design and Evaluation of Control Laws for the X-31A with Reduced Vertical Tail
Authors:
AuthorsInstitution or Email of Authors
Steinhauser, R.UNSPECIFIED
Looye, G.UNSPECIFIED
Brieger, O.UNSPECIFIED
Date:2004
Status:Published
Keywords:object-oriented modeling, nonlinear dynamic inversion, vertical tail reduction
Event Title:AIAA-2004-5031, Proc. of AIAA Guidance, Navigation, and Control Conference and Exhibit, Providence, Rhode Island, USA, August 16-19
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics > System Dynamics and Control (former Control Design Engineering)
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:12 Mar 2010 14:20

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