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Phosphoryl functionalized mesoporous silica (TBP-SBA-15) was synthesized by modified mesoporous silica with γ-amino propyl triethoxy silane and tributyl phosphate. The obtained samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), small angle X-ray diffraction (SAXRD), thermo-gravimetric/differential thermalanalyzer (TG/DTA), N2 adsorption–desorption...
The landing accuracy of a Mars lander is severely affected by a wide range of disturbances at the powered descent stage. To address this problem, a composite guidance law is proposed in this paper. The composite guidance law is developed by the combination of disturbance observer-based control (DOBC) technique and multiple sliding surfaces guidance (MSSG) theory. Compared with other guidance laws,...
In this paper, the problem of asymptotic attenuation and rejection for systems with general periodic disturbances via nonlinear disturbance observer and H∞ control is investigated. A composite controller is constructed by combining the disturbance estimation value with state feedback control law, which can guarantee the closed-loop system asymptotical stability with H∞ performance. Some sufficient...
In general, the conventional Range Alignment methods can provide the satisfactory alignment result in Inverse Synthetic Aperture Radar (ISAR) image. However, because of the airflow disturbance or echo vibration, the target altitude may change and some echoes that deteriorate the precision of Alignment will appear. Considering this problem, echoes feature are analyzed in this paper. To remove the disturbed...
This paper concerns the problem of non-fragile fault-tolerant control for the longitudinal dynamics of an airbreathing hypersonic vehicle under external disturbances. And a corresponding non-fragile adaptive fault-tolerant control scheme is proposed for the longitudinal dynamics. In this approach, two adaptive laws are employed to estimate the minimum value of the actuation effectiveness factor and...
This paper investigates finite time tracking control problem of a nonholonomic wheeled mobile robot in dynamic model with external disturbances, where a kind of finite time disturbance observer is introduced to estimate the external disturbances. First of all, the resulting tracking error dynamic is transformed into two subsystems, i.e., a third-order subsystem and a second-order subsystem for the...
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