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In this paper, an adaptive nonlinear control method based on Lyapunov function is proposed for fuel cell/supercapacitor hybrid energy storage system (HESS) used in electric vehicles. The fuel cell (FC) acts as the main energy storage device, which is connected with a boost converter. And the supercapacitor (SC) acts as the auxiliary energy system, which is connected with a bi-directional DC-DC converter...
Evaporation plays an important role in many industrial applications, such as power generation, cooling, and thermal management. Micro/nanostructured surfaces have the potential of enhancing evaporation heat transfer, but its heat and mass transport mechanism becomes more complicated because of the surface wettability and capillarity effects. It is imperative to understand the evaporation mechanism...
Squeeze film air damping has significant impact on the performance of microelectromechanical devices. In order to understand the squeezed-film damping mechanism, Reynolds equation and its derivatives have been used in previous studies. In fact, the Reynolds equation has limitations in quantifying MEMS characteristics because its assumptions on small amplitude and non-slip boundary condition may not...
The concepts of rotation symmetric structure, symmetric canonical form and symmetric order are defined for linear control systems. It is shown from the results of this paper that the controll systems with rotation symmetry can be transformed to the symmetric canonical form using an appropriate transformation. From this, a new method for proving the stability of control systems with the special structure...
In practical situations we often encounter such kind of systems which possess similar structure. In accordance with the special structure of such kind of systems, we use modern differential geometric approach in this paper to analyze the properties possessed by similar structure. Based on the special structural properties, a new way of system reduction is given in this paper. In addition, a relative...
Robust model predictive control of a discrete-time uncertain linear system is considered. Both polytopic and structured uncertainties are taken into account in the system model. Besides, the system is subject to persistent disturbances. Noting that robust positively invariant (RPI) set plays an important role in both recursive feasibility and stability analysis, computation of a RPI set is developed...
This paper presents computationally attractive robust model predictive control approaches for the control of discrete-time linear systems with input constraints, structured parameter uncertainties and persistent disturbances. In order to ensure robust stability of constrained uncertain systems, constructive methods are proposed to compute robust positively invariant sets for stabilizing predictive...
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