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For quadrotor aircraft, atmospheric turbulence, wind shear, and model uncertainty are important factors which affect the quality of flight, or even lead to a failure of flight. In this paper, we consider the control problem of quadrotor aircraft with linear or nonlinear disturbances including model uncertainty. By employing backstepping technique, adaptive backstepping controllers are proposed which...
The high grid impedance in weak grid will lead to small bandwidth of control system and poor control performance of PV inverter. To solve this problem, this paper presents a quasi-PRD control method which can increase the bandwidth and dynamic response speed of control system. At first, the quasi-PRD controller was applied to replace the traditional PI controller. Then, the two harmonic injection...
In this paper, we aim to design adaptive output feedback controllers for a class of uncertain nonlinear multiple-input single-output (MISO) systems in the presence of stuck type actuator failures. The class of MISO system has a characteristic that the relative degrees with respect to each of the inputs are not necessarily the same. We first design a pre-filter for each input and then derive the state...
The automated pharmacy system actualizes the automation of medicines-filling, medicines-storage and medicines-dispensing, it also solves the existing problems caused by dispersedly stored and manually operated such as inefficiency prescription-processing and high error ratios in hospitals. Medicines are dispensed by the lifter system, which is a nonlinear, time-varying and complex system. A fuzzy...
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