This paper presents a tutorial-style review on the recent results about the disturbance
observer (DOB) in view of robust stabilization and recovery of the nominal performance. The …

The disturbance observer has been widely employed in applications due to its powerful
ability for disturbance rejection and robustness under plant uncertainties. However, it rejects …

Robust stability of the disturbance observer (DOB) control system is studied when the
relative degree of the plant is not the same as that of the nominal model. The study reveals …

Feedback system design is often achieved by neglecting the unmodeled dynamics, such as
the actuator and sensor, to reduce design complexity. It is based on an assumption that the …

This paper presents a disturbance observer (DOB) for a class of linear systems which has
the following features: 1) it recovers the nominal pre-designed time trajectory (approximately …

This paper presents a high-gain observer-based high-order internal model disturbance
observer considering a single-frequency sinusoidal disturbance and mth-order polynomial …

In this paper, we present an add-on type robust controller for uncertain mechanical systems
with a sinusoidal disturbance of an unknown frequency. The main purpose is to recover …

The type-k disturbance observer, also known as high order disturbance observer, is a robust
output feedback controller which can reject polynomial-in-time disturbances exactly and at …

This paper is concerned with the problem of designing distributed control protocols for
network systems affected by delays and disturbances consisting of a first-order polynomial …

This paper addresses performance enhancement using disturbance observers (DOBs) for a
class of hysteresis nonlinearities characterized by the Prandtl-Ishlinskii model. The …