Abstract The parameters such as oil density and bulk elastic modulus of hydraulic in steam turbine electro-hydraulic servo system vary with ambient temperature, pressure, other factors, there are unmodeled dynamics the system, so obtaining a satisfactory following effect is challenging task for servo(EHS) system. According to principle force balance flow continuity, mathematical model bilateral...

Nowadays, the doubly-fed induction generators (DFIGs) based wind turbines (WTs) are the dominant type of WTs connected to grid. Traditionally the back-to-back converters are used to control the DFIGs. In this paper, an Indirect Matrix Converter (IMC) is proposed to control the generator. Compared with back-to-back converters, IMCs have numerous advantages such as: higher level of robustness, re...

The stabilization problem for a class of nonlinear systems is solved via novel method inspired by back-stepping. method, that we call underactuated back-stepping, introduced solving the an inertia wheel pendulum and it then developed mechanical systems. properties resulting closed-loop are studied in detail case studies given to show effectiveness proposed method.

The number of computer break-ins from the outside of an organization has increased with the rapid growth of the Internet. Since many intruders from the outside of an organization employ stepping stones, it is difficult to trace back where the real origin of the attack is. Some research projects have proposed tracing methods for DoS attacks and detecting method of stepping stones. It is still di...

This paper presents a novel formulation of the flight dynamic equations that permits a rapid solution for the design of trajectory following autopilots for nonlinear aircraft dynamic models. A robust autopilot control structure is developed based on the combination of the good features the Nonlinear Dynamic Inversion (NDI) method, Integrator Backstepping method, Time Scale separation and Contro...

This paper presents some examples of stabilization of periodic motions. First, the juggling motion controlled by a duplicated simple controller and neural oscillators is discussed. Next, the bipedal stepping motion of the human like lower body and trunk model is discussed. In this model, the stepping motion was accomplished with neural oscillator and simple posture controllers. At the last part...

This paper presents a new nonlinear backstepping controller for a direct-driven permanent magnet synchronous generator-based wind turbine, which is connected to the power system via back-to-back converters. The proposed controller deals with maximum power point tracking (MPPT) in normal condition and enhances the low-voltage ride-through (LVRT) capability in fault conditions. In this method, to...

Conventional quaternion based methods have been extensively employed for spacecraft attitude control where the aerodynamic forces can be neglected. In the presence of aerodynamic forces, the flight attitude control is more complicated due to aerodynamic moments and inertia uncertainties. In this paper, a robust nero-adaptive quat...