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Augmenting L1 adaptive control of piecewise constant type to a fighter aircraft. Performance and robustness evaluation for rapid maneuvering

Pettersson, Anders LU ; Åström, Karl Johan LU ; Robertsson, Anders LU and Johansson, Rolf LU (2012) 2012 AIAA Guidance, Navigation, and Control Conference In AIAA Guidance, Navigation, and Control Conference, 13 - 16 August 2012
Abstract
An L1 adaptive controller of piecewise constant type has been applied to a fighter aircraft by augmenting it to a linear state-feedback controller. Angle of attack and sideslip as well as velocity vector roll rate is demanded and controlled. It is relatively easy to design a controller augmentation this way; few parameters need to be tuned. To design an L1-controller for roll/pitch/yaw-motion of an aircraft, a five-state reference system with desired dynamics is created and three bandwidths of low-pass filters are chosen. The L1-controller activates when the aircraft aided by the feedback controller deviates from the reference dynamics. Load disturbance rejection is improved when the L1-controller is active. Results from simulations with... (More)
An L1 adaptive controller of piecewise constant type has been applied to a fighter aircraft by augmenting it to a linear state-feedback controller. Angle of attack and sideslip as well as velocity vector roll rate is demanded and controlled. It is relatively easy to design a controller augmentation this way; few parameters need to be tuned. To design an L1-controller for roll/pitch/yaw-motion of an aircraft, a five-state reference system with desired dynamics is created and three bandwidths of low-pass filters are chosen. The L1-controller activates when the aircraft aided by the feedback controller deviates from the reference dynamics. Load disturbance rejection is improved when the L1-controller is active. Results from simulations with different kinds of deviations from the nominal aircraft are presented. Special non-linear design elements need to be introduced if actuator dynamics, including rate limits, interfere with reference system dynamics. Since an L1 adaptive controller of piecewise constant type in its original form is linear time invariant, frequency domain analysis is presented, including comparisons to a typical linear state-feedback controller. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
AIAA Guidance, Navigation, and Control Conference, 13 - 16 August 2012
pages
24 pages
publisher
American Institute of Aeronautics and Astronautics
conference name
2012 AIAA Guidance, Navigation, and Control Conference
external identifiers
  • Scopus:84880617417
project
NFFP5
language
English
LU publication?
yes
id
f83b5f6d-d797-4ef5-8774-941efb4147cf (old id 3457571)
date added to LUP
2013-02-13 10:46:30
date last changed
2016-10-13 04:51:27
@misc{f83b5f6d-d797-4ef5-8774-941efb4147cf,
  abstract     = {An L1 adaptive controller of piecewise constant type has been applied to a fighter aircraft by augmenting it to a linear state-feedback controller. Angle of attack and sideslip as well as velocity vector roll rate is demanded and controlled. It is relatively easy to design a controller augmentation this way; few parameters need to be tuned. To design an L1-controller for roll/pitch/yaw-motion of an aircraft, a five-state reference system with desired dynamics is created and three bandwidths of low-pass filters are chosen. The L1-controller activates when the aircraft aided by the feedback controller deviates from the reference dynamics. Load disturbance rejection is improved when the L1-controller is active. Results from simulations with different kinds of deviations from the nominal aircraft are presented. Special non-linear design elements need to be introduced if actuator dynamics, including rate limits, interfere with reference system dynamics. Since an L1 adaptive controller of piecewise constant type in its original form is linear time invariant, frequency domain analysis is presented, including comparisons to a typical linear state-feedback controller.},
  author       = {Pettersson, Anders and Åström, Karl Johan and Robertsson, Anders and Johansson, Rolf},
  language     = {eng},
  pages        = {24},
  publisher    = {ARRAY(0x989d378)},
  series       = {AIAA Guidance, Navigation, and Control Conference, 13 - 16 August 2012},
  title        = {Augmenting L1 adaptive control of piecewise constant type to a fighter aircraft. Performance and robustness evaluation for rapid maneuvering},
  year         = {2012},
}