This paper proposes several H∞ performance preserving controller reduction methods. One of the advantages of the proposed methods is that the weighting functions for controller reduction is easy to compute and is readily available from standard H∞ control design software. Numerical simulations show that the proposed methods are at least as effective as the best method available in the literature.

In this paper, a comparative study on the subject of robust control of dc/dc PWM converters is presented. Considering a wide range of possible changes for the converter’s operating conditions, robust control of dc/dc PWM converters using some state of the art robust controllers i.e., ∞ H , μ , and fuzzy controllers is studied. The system under study is a CUK converter as a non-linear, variable ...

A powerful syntactic theory as well as expressive modal logics have to deal with self-referentiality. Self-referentiality and paradoxes seem to be close neighbours and depending on the logical system, they have devastating consequences, since they introduce contradictions and trivialise the logical system. There is a large amount of diierent attempts to tackle these problems. Some of them are c...

Problems of stability and H∞ control for discrete-time T-S fuzzy systems with state delay and uncertainties are discussed. A new delay-dependent stability criterion is first proposed by defining an appropriate Lyapunov function. Then, the sufficient conditions for the existence of H∞ fuzzy state-feedback controller is investigated in terms of linear matrix inequality(LMI). Finally, an iterative...

The feed-forward and linear quadratic Gaussian (LQG) controllers significantly reduced the servo error at higher rate tracking. However, the servo error due to wind disturbances acting on the antenna structure is still significant. This error cannot be reduced by the feed-forward controller and is only moderately reduced by the LQG controller. The H∞ controller design approach gives the possibi...

The spacecraft simulator robust control through H∞-based linear matrix inequality (LMI) and robust adaptive method is  implemented. The spacecraft attitude control subsystem simulator consists of  a  platform, an air-bearing and a set of four reaction wheels. This set up provides a free real-time three degree of freedom rotation. Spacecraft simulators are applied in upgrading and checking the c...

Control of a exible joint of an industrial manipulator using H∞ design methods is presented. The considered design methods are i) mixed-H∞ design, and ii) H∞ loop shaping design. Two di erent controller con gurations are examined: one uses only the actuator position, while the other uses the actuator position and the acceleration of end-e ector. The four resulting controllers are compared to a ...

The objective of the paper is to design the robust discrete H∞ controller for dc motor position control using Frequency-Domain Robust Controller Design Toolbox. In this paper, the time performance characteristics of 2 and 3 order controller has been compared by taking dc motor as a design example. The paper aims at demonstrating and simple modelling and robust discrete control synthesis strateg...

The current study aimed at in vitro investigating the kinetic study and thermodynamic analysis of mebendazole drug released from electrospun cellulose nanofiber in which guar gum is used as a release controller. The nanofibers were fabricated by electrospinning technique. The fibers were boosted by different controller guar gum 10 at 50, 250, and 500 ppm concentrations. The drug releas...

increasing of word demand load caused a new distributed generation (dg) to enter to powersystem. one of the most renewable energy is the photovoltaic system. it is beneficial to use thissystem in both separately as well as connected to power system using power electronics interface.in this paper an optimal pid controller for photovoltaic system systems has been developed. theoptimization techni...