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This paper originally applied an optimal sliding mode based optimal composite nonlinear feedback (ISM-CNF) control strategy to the capacitive micromachined ultrasonic transducers (CMUTs) system. It is known that CMUTs system is inherently unstable which results in pull-in phenomenon and sensitive to a small perturbations. Therefore the major problem is to stablize the CMUTS system beyond the pull-in...
The attitude control of space station is different from other satellites. Due to the massive aerodynamic torque, attitude control and momentum management (ACMM) system needs to be designed to prevent the rapid saturation of the control moment gyros (CMGs). This paper applies third-order linear extended state observer (3rd-LESO) with the gains calculated by LQR to achieve ACMM. A unique compensation...
This paper addresses a constrained robust output regulation problem for a class of output feedback systems with unknown control direction. The problem is firstly transformed into a constrained stabilization problem by introducing the internal model principle. Then a robust adaptive feedback control law for the system is proposed to solve the constrained stabilization problem by incorporating the techniques...
In this paper, a second-order sliding mode control (2-SMC) scheme, called twisting algorithm, is applied to control an electrostatically actuated 2D torsional MEMS micromirror. The proposed twisting algorithm is able to improve the transient and positioning performance of the controlled 2D micromirror including robustness against model uncertainties and external disturbances. The main advantages of...
In this paper, we study the robust formation control problem of a class of multi-agent systems based on the generalized internal model principle. We show that this problem finally boils down to a robust stabilization problem of a nonlinear system, the solution of which can be solved by using the existing robust stabilization technique. The efficiency of the proposed design method is verified by one...
In this paper, we consider the global robust output regulation problem for a class of output feedback systems with nonlinear exosystems. Like the special case with linear exosystems, we have shown that the problem can be converted into a global robust stabilization problem of a lower triangular system. But unlike the special case with linear exosystems, the inverse dynamics of the lower triangular...
In this work, we propose a two-dimensional model of opinion dynamics, in which two agents are neighbors if one of their opinion values is within a confident level. We present elementary consensus analysis that reveals the basic characteristics. The consensus threshold under uniform probability distribution is analyzed by means of numerical simulations. Comparison is made between the model and the...
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