Incremental Nonlinear Control for Aeroelastic Wing Load Alleviation and Flutter Suppression

This paper proposes an incremental nonlinear control method for an aeroelastic system’s gust load alleviation and active flutter suppression. These two control objectives can be achieved without modifying the control architecture or the control parameters. The proposed method has guaranteed stability in the Lyapunov sense and also has...

Development of an Aeroservoelastic Platform: From Concept to Final Product

With the increased focus on sustainability, aircraft are designed to reduce their emissions. One way to accomplish this is by increasing the wing aspect ratio, thereby increasing the aerodynamic efficiency, however this is not without consequences. Increased aspect ratio wings have a higher structural mass, are more susceptible to gust and...

Incremental Nonlinear Control for Aeroelastic Wing Load Alleviation and Flutter Suppression

This paper proposes an incremental nonlinear control method for aeroelastic sys- tem gust load alleviation and active flutter suppression. These two control objectives can be achieved without modifying the control architecture or the control parameters. The proposed method has guaranteed stability in the Lyapunov sense and also has robustness...

Generalized State-Space Realization of Parameter-Dependent Unsteady Aerodynamic Models: Generalized State-Space Realization of Parameter-Dependent Unsteady Aerodynamic Models

There is increasing interest in the development of next-generation optimal controllers in the aerospace industry, focused on reducing aircraft environmental impact by mass reduction and enabling higher flight velocities for flexible wing structures. A key challenge in designing an optimal control system for this purpose is modeling the unsteady...

The interaction between active aeroelastic control and structural tailoring in aeroservoelastic wing design

This paper presents an analysis of the interaction and trade-off between active aeroelastic control and passive structural tailoring on a free-flying fully flexible aircraft model. Both technologies are included in the preliminary design of a typical transport aircraft configuration with a conventional control surface layout containing...

Incremental sliding mode flight control

The swift growth of air traffic volume stresses the importance of flight safety enhancement. Statistical data shows that fly-by-wire technology with automatic flight control systems can effectively reduce the fatal accident rate of loss of control in-flight. Although the dynamics of an aircraft are nonlinear and time-varying, it is common...

Wing Optimization with Active Load Control: Integrating Maneuver Load Control and Gust Load Alleviation in Wing Structural Optimization of Large Transport Aircraft

Improving the performance of large transport aircraft requires high aspect ratio and lightweight wings, making aeroelasticity an important factor in wing structural design. Active control of aeroelastic loads can be used to improve the aeroelastic behavior of the wing.<br/><br/>Two active load control techniques are considered: Maneuver Load...

Coupled Flight Dynamic and Unsteady Aeroservoelastic Modeling and Control of a Flexible Wing Aircraft

Recent developments in airframe design include the increasing application of modern lightweight materials. Airframe designs based on composite materials are able to provide sufficient structural strength at lower mass, but often have decreased structural rigidity. Flight vehicles with relatively flexible structures exhibit more prominent...

Beyond Classical Upscaling: Integrated Aeroservoelastic Design and Optimization of Large Offshore Wind Turbines

Issues related to environmental concern and fossil fuel exhaustion has made wind energy the most widely accepted renewable energy resource. However, there are still several challenges to be solved such as the integrated design of wind turbines, aeroelastic response and stability prediction, grid integration, offshore resource assessment and...

Active aerodynamic load control on wind turbines: Aeroservoelastic modeling and wind tunnel

This thesis investigates particular concepts and technologies that can alleviate fatigue loads on wind turbines by using distributed active aerodynamic devices on the blades, a concept briefly referred to as `smart blades'. Firstly, published research work on smart control devices is reviewed, and the pros and cons for the application on wind...

Controller Design Automation for Aeroservoelastic Design Optimization of Wind Turbines

The purpose of this paper is to integrate the controller design of wind turbines with structure and aerodynamic analysis and use the final product in the design optimization process (DOP) of wind turbines. To do that, the controller design is automated and integrated with an aeroelastic simulation tool. This integrated tool is linked with an...