Gust Load Alleviation with Robust Control for a Flexible Wing

Abstract

Traditional methods for gust alleviation of aircraft are mostly proposed based on a specific flight condition. In this paper, robust control laws are designed for a large flexible wing with uncertainty in Mach number and dynamic pressure. To accurately describe the aeroelastic model over a large flight envelope, a nonlinear parameter-varying model is developed which is a function of both Mach number and dynamic pressure. Then a linear fractional transformation is established accordingly and a modified model order reduction technique is applied to reduce the size of the uncertainty block. The developed model, in which the statistic nature of the gust is considered by using the Dryden power spectral density function, enables the use of -synthesis procedures for controller design. The simulations show that the controller can always effectively reduce the wing root shear force and bending moment at a given range of Mach number and dynamic pressure.

Influence of Novel Airframe Technologies on the Feasibility of Fully-Electric Regional Aviation

“…Previously, researchers have approached the design of active load alleviation systems in different ways. Rossow et al [26] investigated the feasibility of an aircraft featuring load alleviation technologies; Sun et al [27] looked at active load alleviation from the control system perspective; and Zing et al [28] demonstrated the experimental results of the high aspect-ratio wing wind-tunnel test with active load alleviation while using piezoelectric control. The work of Fezans et al focused on novel sensors and control systems technologies to enable rapid and robust active load alleviation [29][30][31][32].…”

Active Gust Load Alleviation of High-Aspect Ratio Flexible Wing Aircraft

“…In previous research, [21][22][23][24] the wing root bending moment M y and the rigid-body x r and elastic state x e responses have been selected as the main performance metrics to consider. Consequently, the performance metrics relating to these variables (1, 2, and 5) will be considered to be of most importance.…”

Barrier Lyapunov function and disturbance observer based omnidirectional robust gust response stabilization for multi-control-effectors aircraft

“…Many researchers concentrate their direction on the gust load alleviation (GLA) field because of its indispensable role on flight safety and passenger comfort (Smeur et al , 2016; Ferrier et al , 2018; Wang et al ,2017; Grzedziński and Mróz, 2010; Guo et al , 2015; Liu and Sun, 2016; Poussot-Vassal et al , 2017; Tang et al , 2016). As a key branch of GLA design, gust response stabilization (GRS) has attracted more and more scholars’ attention because of flight stability.…”