Heave compensation systems are essential for operations’ safety, reliability, and efficiency in harsh offshore environments. This paper investigates the vibration suppression problem of a type deep-sea robot with length time variation operating environments active heave systems, where hydraulic compensators implement actuators input nonlinearity, model coupling, unknown nonlinear disturbances. ...

In current industrial control applications, the proportionalþ integralþ derivative (PID) control is still used as the leading tool, but constructing controller requires precise mathematical model of plant, and tuning the parameters of controllers is not simple to implement. Motivated by the gap between theory and practice in control problems, linear active disturbance rejection control (LADRC) ...

This paper deals with the synthesis of fuzzy state feedback controller of induction motor with optimal performance. First, the Takagi-Sugeno (T-S) fuzzy model is employed to approximate a non linear system in the synchronous d-q frame rotating with electromagnetic field-oriented. Next, a fuzzy controller is designed to stabilise the induction motor and guaranteed a minimum disturbance attenuati...

In this paper, an output feedback discontinuous controller is proposed for a class of non-linear systems to attenuate the disturbance influence on the system performance. Our main goal is to globally stabilize the non-linear system in the presence of unknown structural system uncertainties and external disturbances. Our approach consists of constructing a high gain non-linear observer to recons...

In the paper, an output-based disturbance observer of reduced order is presented for a class of discretetime linear systems. First, a general form of a disturbance observer is proposed when full states are available. Then, by combining a state function estimator of minimal order, an output-based disturbance observer is derived. The existence condition will be formulated in the form of a static ...

Abstract— In this paper, an H∞/LPV observer to be used in an automotive suspension control application is proposed. The system considered is a road disturbance affected quarter car equipped with an industrial SOBEN damper. This observer is designed in the H∞ framework in order to minimize the effect of the unknown road disturbance on the estimated states. The damper studied in this paper is hig...

A backstepping controller based on a non-linear disturbance observer (NDOB) was created to enhance the dynamic performance and reliability of three-degree-of-freedom hybrid magnetic bearings. After structure bearings is introduced, mathematical model established, equation state derived by equivalent circuit technique. Based model, designed used predict system disturbance, control algorithm comp...

In recent years, the power electronic load infiltrates into microgrid in form of constant power, and its negative impedance characteristics threaten stability system. To alleviate instability caused by loads (CPLs) (CILs) boost converter DC microgrid, an adaptive backstepping control (BSC) method is designed. Firstly, based on dynamic model converter, input voltage estimator designed, which int...