| The demands of an efficient high-lift device have been one of major driving forces inaerodynamic research for many years. The fan-wing was described as a simple, stable, quiet and veryefficient high-lift device. Having these advantages, it recently becomes a hotspot in unmanned aerialvehicle and exhibits great potential for exploitation a wider range of application for either military orcivilian purpose. For the moment, the research on fan-wing is focused on the practical application.And many related theories in which should be studied. Therefore establishing mathematical modeland the corresponding control law design have important significance for the improvement anddevelopment of fan-wing.Firstly, the advantages and disadvantages of common configurations of fixed wing aircraft andthe characteristics of fan-wing aircraft are considered. Then the configuration of fan-wing is set forth.With the method of CFD, a fan-wing is designed for practical application by using the design methodof conventional fixed wing aircraft for reference. And the details design is given.Secondly, the flying principle of fan-wing and common fixed wing aircraft is compared. Thenthe longitudinal and lateral motion equation of fan-wing aircraft is derived. The relationship of thestate parameters and the aerodynamic forces on fan-wing is studied with numerical simulation. So theaerodynamic derivatives of linearized motion equations are obtained. In other words, themathematical model of longitudinal and lateral channel is given.Finally, based on the mathematical model, the control law in longitudinal model was designed byusing multivariable pole-assignment and liner quadratic regulator. The results of simulation show thatboth of the two methods can improve the performance, but LQR has a rapider convergence velocityand shorter settling time. |
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