This paper is concerned with control-based damping of friction-induced self-excited oscillations that appear in electromechanical systems an elastic shaft. approach does not demand additional measurements or observer design. The control system provides the angular velocity and via combination a parallel feed-forward compensator (PFC) adaptive λ-tracking feedback control. PFC designed to stabili...

A high-performance triaxial fast tool servo (FTS) with the hybrid electromagnetic–piezoelectric actuation and parallel–serial-kinematic structure is reported. Featuring balanced uniform actuation, in this article, a novel axis-symmetric linearized reluctance actuator proposed to generate planar motion parallel, piezoactuated vertical then serially carried by within limited space. Verified finit...

This paper examines the dynamics and control of a variable blade pitch wind turbine during extreme gust subject to actuators saturation. The mathematical model is derived using Lagrange dynamics. controller formulated Takagi–Sugeno fuzzy utilizes parallel distributor compensator obtain feedback gain. controller’s objective generator electromagnetic torque angle attenuate external disturbances. ...

This work presents a rigorous analysis of the adverse effects of cyber-physical attacks on discrete-time distributed multi-agent systems, and propose a mitigation approach for attacks on sensors and actuators. First, we show how an attack on a compromised agent can propagate and affect intact agents that are reachable from it. This is, an attack on a single node snowballs into a network-wide at...

In this paper symbolic quantifier elimination methods are used to explore the fragility of feedback compensators, and to design feedback systems with non-fragile compensators. A compensator is said to be fragile if given variations in compensator parameters result in significant deterioration of feedback performance. The issue of fragility is important in understanding the level of acurracy req...