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The purpose of this paper is to introduce a complex nonlinear model to a novel tandem ducted fan vehicle which adopted a structure of coaxial rotor and cyclic pitch system, considering aerodynamic coupling, disturbing between the upper and the lower rotor, and special aerodynamic characteristics of duct. On this basis, a robust hover control system has been designed to attitude control using H-infinite...
This paper focuses on modeling and robust hover control system design for a novel multi-tandem ducted fan vehicle. A comprehensive nonlinear model for this unmanned aircraft, considering main aerodynamic coupling and actuator dynamics, is first presented. For the sake of low order controllers, the two-layer controller structure with only three-order controllers, is adopted to construct a flight control...
This paper presents aerodynamic analysis of an unmanned small-scaled gyroplane with a rotor having cyclic pitch system. A comprehensive nonlinear model is derived for it which involves force and moment generation mechanism for the flying vehicle. The nonlinear model is linearized with approximations and deduced on a prescribed flight condition. Our gyroplane dynamic modal response is further reconfigured...
The correction methods of water-level measurements and discharge measurements are a important kind of hydrodynamic model real-time correction methods. The existing hydrodynamic model real-time correction methods are almost designed based on Kalman filter. In which, an implicit condition is that the system noises are obeys a Gaussian distribution with known mean and variance. However, in practice,...
A new relative navigation and attitude determination approach was developed for autonomous spacecraft rendezvous in this paper. The approach uses multiple optical line-of-sight vectors observations from spacecraft to another combined with radio measurements. A two order kalman filter was designed to determine relative attitude and position information. The modified rodrigues parameter was used to...
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