In order to meet the constraints of velocity and acceleration displacement attitude motion an unmanned helicopter during automatic carrier landing mission, asymmetric tracking differentiator, which could set speed limits in two directions tracked signal respectively, was derived based on differentiator active disturbance rejection control method. Based proposed a fal-extended state observer fal...

This paper articulates, from a theoretical perspective, a new emerging control technology, known as active disturbance rejection control to this day. Three cornerstones toward building the foundation of active disturbance rejection control, namely, the tracking differentiator, the extended state observer, and the extended state observer based feedback are expounded separately. The paper tries t...

Automation of a unique manually controlled industrial bar straightener is proposed. A continuous-time closed loop model is constructed in Simulink for an event-driven process through the use of asynchronous timers. The system is simulated with linear and nonlinear PD controllers. A nonlinear filter, called the tracking differentiator, is introduced as an alternative to a linear approximate mean...

This paper presents a discrete-time output feedback controller to regulate the voltage of DC-DC buck converter. The proposal’s main feature is application equivalent robust exact filtering differentiator. First, document exposes theoretical analysis closed-loop system, where it considered problem implementing real-time differentiator with good relationship between exactness and noise filtration...

In this paper, a non-negative adaptive mechanism based on an nonsingular fast terminal sliding mode control strategy is proposed to have finite time and high-speed trajectory tracking for parallel manipulators with the existence of unknown bounded complex uncertainties external disturbances. The approach hybrid scheme online mechanism, differentiator, (NFTSMC). Based can remove assumption that ...

This paper describes a method for optimizing low-pass infinite impulse response (IIR) digital differentiators. The wide band differentiator is cascaded with low-pass IIR filter resulting in linear phase low-pass IIR digital differentiator. Further the frequency response of IIR differentiator is improved by altering the gain and denominator coefficients of that differentiator. The genetic algori...

The problem of quadrotor attitude and position control is considered in the presence generally lumped disturbances: external disturbances model uncertainty. improved active disturbance rejection controller (ADRC) for trajectory tracking proposed compensating disturbances. Firstly, sigmoid differentiator (ISTD), combining Sigmoid function sliding mode terminal attractor proposed, which can accel...