飞艇动导数与附加质量相互融合的方法

doi:10.7527/S1000-6893.2020.23648

Abstract

Abstract: Dynamic stability derivatives and added mass represent an airship’s aerodynamics in viscous flow and acyclic potential flow. To develop a method for fusing these two aerodynamic coefficients in airship modeling, the classification method for dynamic stability derivatives and added mass and the fusing method for same aerodynamic coefficient ingredient are studied. By introducing a unified theory for analyzing aerodynamics in incompressible flow, a conclusion is drawn that the viscous aerodynamics should be reserved and the corresponding results in acyclic potential flow should be abandoned in fusing the same ingredient of aerodynamics. By studying the relationship between aerodynamics and the present motion parameter of an airship, the classification method for aerodynamics and the aerodynamic coefficient is built. To keep the aerodynamic classification method same in the two flow fields, a new method for reconstructing the present motion parameters of airships is proposed so that the aerodynamic coefficients in the two flow fields can be both classified according to the new parameters, and each ingredient can be evaluated. Based on these studies, a new fusing method for dynamic stability derivatives and added mass is proposed and its difference with the present fusing method is discussed. A numerical example is presented to show the effect of different fusing methods on the dynamic characteristics of an airship's longitudinal perturbation motion and illustrate the necessity for adopting this new fusing method.

Key words: airship, dynamic derivatives, added mass, fusing, vorticity dynamics, linearization, dynamic characteristics

CLC Number:

V211.24

LIN Xianwu, WANG Shichao, LI Zhibin, LAN Weiyao. Fusing method for dynamic derivatives and added mass of airships[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(8): 123648-123648.

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Fusing method for dynamic derivatives and added mass of airships

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