Miguel S. Suarez-Castanon

Output feedback stabilization for a PVTOL aircraft based on a sliding mode combined with an energy control strategy

A control strategy for the regulation of a PVTOL, based on output-feedback, is introduced. To this end, a couple of controllers or actuators that operate concurrently are proposed. One of them stabilizes the vertical variable in finite time, by means of a novel sliding mode controller. The other actuator uses the energy control approach to balance, simultaneously, the horizontal and angular variables. The needed velocity is computed using the well-known supertwisting algorithm, which works independently of the controllers. To verify the performance of the stabilizing strategy, a numerical experiment and a numerical comparison among two well-known control strategies, were carried out.

Stabilization of the angular velocity of a rigid body system using two torques: Energy matching condition

We present an energy matching control strategy model for the angular velocity stabilization of a rigid body system that assumes that two independent controllers are available. The control strategy consists of solving a feasible matching condition in order to derive a feedback controller which forces the closed-loop system to be globally asymptotically stable.

Output-Feedback Stabilization of the PVTOL Aircraft System Based on an Exact Differentiator

An output-feedback control strategy for the regulation of a planar vertical take-off and landing aircraft is presented here. The strategy consists of two controllers that work simultaneously. The first controller stabilizes the vertical variable, and is based on a simple feedback-linearization procedure, in combination with a nonlinear controller (which behaves as a terminal slide mode). The other controller stabilizes the horizontal and angular variables to the desired rest position, and was designed using an energy-control method. The velocities were exactly estimated with a second-order sliding-mode observer. Because this observer computes the velocities in finite time, the control strategy can be designed independently. The effectiveness of the closed-loop system was tested through numerical simulations and compared with other control strategies.

Master-slave synchronization for a chaotic system by means of I&I observer

Here is applied The Immersion and Invariance method (I&I) in order to design a novel observer to solve the chaotic synchronization for the master-slave configuration, where the master belongs to a class of feedback linearized systems. This paper shows a robust observer which asymptotically calculates the underlying dynamics of the master system. We performed convincing numerical simulations.

A maneuver control strategy for optical tweezers

A control strategy for changing the position of an immersed micro particle in a viscous medium and trapped by optical tweezers is presented. The feedback controller was designed under the consideration that the mass of the micro particle is sufficiently enough so it can be discarded from the equations of motion. In practice it is true, since the inertial force produced by the motion of a micron-scaled trapped particle is completely dominated by the medium viscous drag force. To carried out the stability analysis of the controlled system the standard Lyapunov stability theory was used. Numerical simulations were performed to show the robustness of the obtained closed-loop system in the presence of random thermal noise.