The structure of the control matrix of a direct strain rate feedback, based on collocated piezoelectric patches operated in surface mode, is analytically obtained in the elementary case of a simply supported beam. This kind of control, often improperly called "velocity feedback" because of a formal analogy with the equation of a classical velocity controlled system, has been exploited by severa...

Movement planning is thought to be primarily determined by motor costs such as inaccuracy and effort. Solving for the optimal plan that minimizes these costs typically leads to specifying a time-varying feedback controller which both generates the movement and can optimally correct for errors that arise within a movement. However, the quality of the sensory feedback during a movement can depend...

This paper addresses modeling analysis and the soft seating control of an electromagnetic actuator used in electromechanical camless valvetrains. Our mathematical modeling analysis reveals the instability of the actuator dynamics linearized around the seating position and zero velocity. This implies that open loop pulse shaping alone cannot render repeatable valve closing and seating motion. Cl...

A modified skyhook control for the semi-active Macpherson suspension system is considered. A new quarter-car model, which incorporates the rotational motion of the unsprung mass, is introduced. A feedback control law in the form of a modified skyhook control is derived. Two filters to estimate the absolute velocity of the sprung mass and the relative velocity of the rattle space are designed. B...

To improve stability and convergence, feedback control is often incorporated with iterative learning control (ILC), resulting in feedback feed-forward ILC (FFILC). In this paper, a general form of FFILC is studied, comprising of two feedback controllers, a state feedback controller and a tracking error compensator, for the robustness and convergence along time direction, and an ILC for performa...

A feedback control law is derived that causes a nonlinear, nonholo-nomic, non-minimum phase model of a riderless powered two-wheeled bicycle to stably track arbitrary smooth trajectories of roll-angle and non-zero rear-wheel velocity.

in many active noise control (anc) applications, an online secondary pathmodelling method that uses a white noise as a training signal is required. this paperproposes a new feedback anc system. here we modified both the fxlms and thevss-lms algorithms to raised noise attenuation and modelling accuracy for theoverall system. the proposed algorithm stops injection of the white noise at theoptimum...

This paper considers adaptive position control of a permanent magnet (PM) stepper motor using exact linearization via static state-feedback. Physical outputs are chosen in such a way that the resulting closed-loop system is linearized and decoupled. The objective of the adaptive controller for a PM stepper motor is to achieve output tracking between the motor outputs and prescribed reference si...

introduction: functional ankle instability has described as a “feeling of giving way”. balance control deficit is one of the sensorimotor impairments observed in people with functional ankle instability that has been described to damage to the afferent receptors within the ligaments and joint capsule that affected during sprain. foot orthosis can improve balance control via enhanced sensory aff...