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This paper is concerned with the problem of the robust sampled-data H∞ control for an offshore steel jacket platform subject to the self-excited wave force and the external disturbance. First, by using the input delay method, the corresponding closed-loop system with the sampling measurements is transformed into a continuous-time system. Then, based on a Lyapunov functional, the H∞ performance is...
We propose a two-degree-of-freedom washout control structure for tracking of sinusoidal references in lightly damped structures subject to sensor drift and measurement noise. An algorithm is derived, assigning stable parameter intervals to a second-order washout damping compensator for a resonant plant with a single dominant mode. Simulation results demonstrate quality drift and noise rejection performance...
In this article a methodology for designing a minimum gain PID controller for load frequency control in power system is proposed. The resulting PID controller reduces the required control effort while guaranteeing that pre-defined design specifications like settling time and damping ratio are achieved in the response. For this purpose a subset of the complex plane corresponding to the design specifications...
The stability of RF (radio frequency) control systems is an essential part of particle accelerator technology. In accelerators, such as heavy-ion synchrotrons, RF feedback systems are used to damp longitudinal oscillation modes of the particle beam. Longitudinal modes have been analyzed in detail by accelerator physicists and there exists a closed theory that describes most of the observed phenomena...
We present a study on the active control of vibrations of a flexible mechanical structure in presence of saturation affecting the closed-loop control signal. The application we consider here is a system composed of a flexible beam with one edge clamped on a movable support and the other kinematically free. Two piezoelectric patches are bonded on the beam: one of them is used as an actuator and the...
This paper proposed a concise nonlinear fin roll control derived from integrator backstepping with nonlinear damping term. The resulting backstepping-based controller consists two parts, first part is a PID controller which agrees very well with the concise robust close-loop gain shaping algorithm (CGSA). While the second part is a nonlinear compensation which can be simplified by leaving the high...
In this paper, a novel approach to reduce the effect of negative damping that causes brake noise is proposed by applying an active force control (AFC) based strategy to a two degree-of-freedom model of a disk brake system. At first, the disc brake model is simulated and analyzed using a closed loop pure PID controller. Later, it is integrated with AFC and simulated under similar operating environment...
Non-stationary disturbances in motion systems generally limit the closed-loop performance. If these disturbance can be measured, this measurement can be used to enable a linear parameter varying (LPV) controller to adapt itself to the current operating condition, resulting in a closed-loop system with an overall increased performance. In this paper, this idea is applied to an active vibration isolation...
In this paper, a small signal model of hysteretic current mode control with variable frequency and fixed hysteretic band is presented, based on three terminal averaged switch cell of buck converter in continuous current mode. This model reveals that the averaged current is the control target of hysteretic control. And phase lag of current loop with high switching frequency is quite small that makes...
This paper presents the modeling, controller design and a steady-state analysis algorithm for a wind-driven induction generator system. An output feedback linear quadratic controller is designed for the static synchronous compensator (STATCOM) and the variable blade pitch in a wind energy conversion system (WECS) in order to reach the voltage and mechanical power control under both grid-connection...
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