Mechanical-bearing-guided motion stage is widely used in electronic manufacturing
equipment for its excellent high-acceleration performance and low cost, but its positioning …

Backlash is a common nonlinear phenomenon in mechanical systems, producing undesired
behavior such as inaccuracies and oscillations. Instability thereby may limit the speed and …

In this study, a novel robust observer-based adaptive controller was formulated for systems
represented by second-order input–output dynamics with unknown second state, and it was …

In servo drive systems, there usually exist elastic components that inevitably cause
mechanical oscillations. In order to achieve self-tuning characteristics of the controller and …

Rotational-translational actuator (RTAC) system has the underactuated characteristics, ie, it
has two states to be stabilized with only one control input. To overcome this problem, a new …

In this work, a repetitive control approach for the tracking of harmonic reference trajectories
in the presence of actuator backlash and sticking friction is presented. A spatial Fourier …

In recent years, underactuated systems have been widely employed in engineering due to
their simple structure, high performance, and low cost. This paper deals with the robust …