Douglas Russell

TL;DR: In this article, positive velocity and position feedback (PVPF) is used to achieve full damping of the first resonant mode whilst also achieving bandwidth greater than the natural frequency of the plant.

TL;DR: In this paper, a new vibration damping technique based on Integral Force Feedback (IFF) is described. But the proposed technique allows an arbitrary damping ratio to be achieved by introducing an additional feed-through term to the control system, which results in an extra degree of freedom that allows the position of the zeros to be modified and the maximum modal damping to be increased.

TL;DR: In this article, a controller design to compensate the effects of time delay in a flexure-based piezoelectric stack driven nanopositioner is presented. And a theoretical model which takes into account the dependence between the sampling time and the delay introduced is proposed.

TL;DR: In this paper, an improvement to Integral Force Feedback (IFF) damping control is proposed, which allows any arbitrary damping ratio to be achieved for a system by introducing a new feed-through term in the system.

TL;DR: Simulations show full damping of the first resonant mode whilst also achieving bandwidth greater than the natural frequency of the plant, allowing for high speed scanning with accurate tracking.