Aerodynamic Forces Of A Telescopic Wing And Its Zero-poisson’s Ratio Extension Structure

The paper studies the aerodynamic characteristics and the longitudinal flight dynamics of anaircraft with telescopic wings during changing its wingspan in the first part. Firstly, the aircraft modelwith telescopic wings is built on the basis of multi-rigid-body systems dynamics, and the longitudinalflight equation are obtained. Then the time-varying parameters of the morphing aircraft relative to thecenter of gravity, the moment of mass, and the moment of inertia are given numerically. Furthermore,the wingspan-dependent aerodynamics analysis of the morphing aircraft are conducted usingFLUENT software package in combination with the longitudinal dynamic equation. The results showthat the contraction of wing could lead to an abrupt change in translation motion, so that there is needfor controlling the pitch motion in order to maintain a steady flight during wingspan change.The topology optimization method with the zero-Poisson’s ratio extension is employed to designthe skeleton structure of the telescopic wing in the second part. A rectangular plate is selected as thedesign area, whilst the solid isotropic material with penalization model and the optimal criterionarithmetic are adopted in the numerical iteration process. Afer determining the appropriate parametersfor the topology optimization, a skeleton structure for different wingspan is obtained. To achieve azero Poisson’s ratio extension mechanism, the fixed joints and the bars in the skeleton structure arereplaced by active hinges and telescopic nested structures, respectively.