The technological advances, mainly in the development of new materials, recovered the interest in the application of morphing wings in aircraft. Due to the potential of replacing conventional control surfaces by morphing surfaces, the present work presents the modeling of aerodynamics, dynamics and control design of an aircraft with morphing wings. The morphing concept is given by changing the camber of the trailing edge along the wingspan. For aerodynamics modeling, it was adopted unsteady strip theory and, for dynamics modeling, it was used rigid body mechanics, considering the displacement of the center of mass and the time-varying inertia tensor. Finally, control design is performed using Exponential Mapping Controller (EMC) method. The results showed that, for the adopted variable geometry configuration, the influence of the center of mass displacement and the inertia variation on the aircraft behavior were insignificant, whereas the influences of the unsteady aerodynamics were significant. Consideration of the unsteady aerodynamic effects increases the magnitude of the aircraft movements, necessitating a greater control action.
In space missions, there is often a need for an attitude control system capable of maintaining the desired attitude. In situations that require agile and accurate responses, which also require large torques, control moment gyroscopes (CMGs) may be used. Control moment gyroscopes are high angular moment gyros mounted on gimbals and are responsible for changing the direction of the angular momentum vector, consequently generating the control torques. There are several linear and nonlinear techniques that can be employed in the design of control laws with the final choice being a compromise between simplicity, effectiveness, efficiency and robustness. The main objective of this study is to evaluate the performance of control systems techniques with 4 CMGs in a pyramidal arrangement, either by using Linear Quadratic Tracker (LQT) with integral compensator or Exponential Mapping Control (EMC). A reference attitude will be defined to be traced in the presence of disturbance torques caused by the gravitational gradient.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.