Vibrational feedback control of time delay systems

This paper applies vibrational feedback control to time lag systems. Averaging theory for differential delay systems is presented and then applied to aid in the design of periodic controllers. Both stabilization and transient issues are discussed. An illustrative example is given which demonstrates that the proposed controller: 1) provides superior robustness properties in comparison to time-invariant controllers when applied correctly; 2) is not robust with respect to unmodeled delays; and 3) does not have zero placement capabilities, in the sense defined in the paper     

Solar Battery Chargers for NiMH Batteries

This paper proposes new solar battery chargers for NiMH batteries. First, it is shown that existing charge-control methods can fail when charging by solar arrays in changing environmental conditions. This article discusses the reasons for the failure and introduces new voltage and temperature-based charge- control techniques. To increase charge speed, a maximum power point tracker is also implemented within the micro-controller of the proposed charger.     

Delay independent stability conditions and decay estimates fortime-varying functional differential equations

This paper presents sufficient delay independent conditions that guarantee stability of nonlinear time varying functional differential equations (FDE's). Estimates on the rate of decay of solutions are also obtained