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Longitudinal control laws design for a flying wing aircraftZhu, Yan. 02 1900 (has links)
This research is concerned with the flight dynamic, pitch flight control and flying
qualities assessment for the reference BWB aircraft. It aims to develop the
longitudinal control laws which could satisfy the flying and handing qualities
over the whole flight envelope with added consideration of centre of gravity (CG)
variation.
In order to achieve this goal, both the longitudinal stability augmentation system
(SAS) and autopilot control laws are studied in this thesis. Using the pole
placement method, two sets of local Linear-Time-Invariant (LTI) SAS controllers
are designed from the viewpoints of flying and handing qualities assessment
and wind disturbance checking. The global gain schedule is developed with the
scheduling variable of dynamic pressure to transfer gains smoothly between
these two trim points. In addition, the poles movement of short period mode with
the varying CG position are analysed, and some approaches of control system
design to address the problem of reduced stability induced by CG variation are
discussed as well. To achieve the command control for the aircraft, outer loop
autopilot both pitch attitude hold and altitude hold are implemented by using the
root locus method.
By the existing criteria in MIL-F-8785C specifications being employed to assess
the augmented aircraft response, the SAS linear controller with automatic
changing gains effectively improve the stability characteristic for the reference
BWB aircraft over the whole envelope. Hence, the augmented aircraft equals to
a good characteristic controlled object for the outer loop or command path
design, which guarantee the satisfactory performance of command control for
the BWB aircraft.
The flight control law for the longitudinal was completed with the SAS controller
and autopilot design. In particular, the SAS was achieved with Level 1 flying and
handing qualities, meanwhile the autopilot system was applied to obtain a
satisfactory pitch attitude and altitude tracking performance.
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FILTERED-DYNAMIC-INVERSION CONTROL FOR FIXED-WING UNMANNED AERIAL SYSTEMSMullen, Jon 01 January 2014 (has links)
Instrumented umanned aerial vehicles represent a new way of measuring turbulence in the atmospheric boundary layer. However, autonomous measurements require control methods with disturbance-rejection and altitude command-following capabilities. Filtered dynamic inversion is a control method with desirable disturbance-rejection and command-following properties, and this controller requires limited model information. We implement filtered dynamic inversion as the pitch controller in an altitude-hold autopilot. We design and numerically simulate the continuous-time and discrete-time filtered-dynamic-inversion controllers with anti-windup on a nonlinear aircraft model. Finally, we present results from a flight experiment comparing the filtered-dynamic-inversion controller to a classical proportional-integral controller. The experimental results show that the filtered-dynamic-inversion controller performs better than a proportional-integral controller at certain values of the parameter.
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