Multi-Objective Adaptive Control for Load Alleviation and Drag Minimization of Flexible Aircraft
نویسندگان
چکیده
This paper describes a multi-objective flight control system design for flexible aircraft to take advantage of the availability of multi-functional distributed flight control surfaces to simultaneously gain aerodynamic efficiency, maneuver and gust load alleviation, and aeroservoelastic (ASE) mode suppression while maintaining traditional pilot command-tracking tasks. A multi-objective optimal control design is developed to establish a reference model of the closed-loop plant to achieve simultaneously the four objectives: pilot command tracking, drag optimization, maneuver load alleviation, and ASE mode suppression. An adaptive gust load alleviation control is designed to estimate the gust disturbance for the disturbance rejection using a modified least-squares gradient adaptive law method. Simulations of the gust load alleviation and drag optimization control on NASA Generic Transport Model equipped with flexible wings demonstrate the effectiveness of the multi-objective flight control method.
منابع مشابه
Multi-Objective Flight Control for Drag Minimization and Load Alleviation of High-Aspect Ratio Flexible Wing Aircraft
As aircraft wings become much more flexible due to the use of light-weight composites material, adverse aerodynamics at off-design performance can result from changes in wing shapes due to aeroelastic deflections. Increased drag, hence increased fuel burn, is a potential consequence. Without means for aeroelastic compensation, the benefit of weight reduction from the use of light-weight materia...
متن کاملA Multi-Objective Flight Control Approach for Performance Adaptive Aeroelastic Wing
As aircraft wings become much more flexible due to the use of light-weight composites material, adverse aerodynamics at off-design performance can result from changes in wing shapes due to aeroelastic deflections. Increased drag, hence more fuel burn, is a potential consequence. Without means for aeroelastic compensation, the benefit of weight reduction from the use of light-weight material cou...
متن کاملAeroelastic Modeling of Elastically Shaped Aircraft Concept via Wing Shaping Control for Drag Reduction
Lightweight aircraft design has received a considerable attention in recent years as a means for improving cruise efficiency. Reducing aircraft weight results in lower lift requirements which directly translate into lower drag, hence reduced engine thrust requirements during cruise. The use of lightweight materials such as advanced composite materials has been adopted by airframe manufacturers ...
متن کاملAdaptive Maneuver Load Alleviation for Flexible Wing Aircraft with Nonminimum Phase Zeros
A two-part control system is designed for flight path angle command tracking that includes an adaptive control component to reduce maneuver load. The primary controller is nonadaptive and facilitates the tracking goal. The secondary controller is adaptive and is tasked only with reducing the maneuver load resulting from the tracking objective. It is designed to function in addition to the prima...
متن کاملFACTS Devices Allocation to Congestion Alleviation Incorporating Voltage Dependence of Loads
This paper presents a novel optimization based methodology to allocate Flexible AC Transmission Systems (FACTS) devices in an attempt to improve the previously mentioned researches in this field. Static voltage stability enhancement, voltage profile improvement, line congestion alleviation, and FACTS devices investment cost reduction, have been considered, simultaneously, as objective funct...
متن کامل