This paper deals with the adaptive dead–zone compensation strategy based on notion of H∞ optimality. It is assumed that the dead–zone model can be divided into unknown parameters term and bounded disturbance term, an adaptive H∞ control method is given. Proposed control strategy does not include the discontinuous function, therefore, it is effective for the practical applications. Moreover, in ...

In this paper, the performance of two low power phase frequency detectors is compared. A modified D-FF based PFD reduces the power consumption of traditional PFD to 4.732uW at 40MHz clock frequency and dead zone to 40ps.It is suitable for low power applications. A Falling Edge PFD uses only 12 transistors. This PFD operates up to 1GHz at 1.8V supply voltage. It consumes only 5.5uW when operatin...

DC motors have been widely used in the electromechanical systems due to its simple structure, ease of implementing variable speed control and low cost. In high accuracy servo control system, high control performance of DC motor is needed. DC motors have traditionally been modelled as IInd order linear system, which ignores the dead nonlinear zone of the motor. Unfortunately, the dead zone cause...

A nonsingular performance comparison between two standard robust adaptive control designs based on the dead-zone and projection modifications is given. A worst case transient cost functional penalising the L∞ norm of the state, control and control derivative has been chosen as the criterion of comparison. If a bound on the L∞ norm of the disturbance is known, it is shown that the dead-zone cont...

In this paper we investigate the synchronization problem of drive-response chaotic systems with a scalar coupling signal. By using the scalar transmitted signal from the drive chaotic system, an observer-based response chaotic system with dead-zone nonlinear input is designed. An output feedback control technique is derived to achieve generalized projective synchronization between the drive sys...

This paper examines the application of human computation (HC) to twodimensional image pattern matching. The two main goals of our algorithm are to use turks as the processing units to perform an efficient pattern match attempt on a subsection of an image, and to divide the work using a version of dead-zone based pattern matching. In this approach, human computation presents an alternative to ma...

We consider standard robust adaptive control designs based on the dead-zone and projection modifications, and compare their performance w.r.t. a worst case transient cost functional penalizing the L norm of the state, control and control derivative. If a bound on the L norm of the disturbance is known, it is shown that the dead-zone controller outperforms the projection controller when the a-pr...

This paper deals with the challenging aspect concerning the state estimation in hydraulic actuators characterized by not negligible nonlinearities. Particularly,. One of the most common hard nonlinearities in hydraulic actuator is the deadzone. More specifically, dead-zone occurs in hydraulic control valves when its spool occludes the orifice with an overlap, so that for a range of spool positi...