| Dragonfly wing is a perfect structure with light weight, large span and strong relative capacity and plays the best reference for bionic structure. This paper studies dragonfly wing statics and dynamics characteristics. Based on the research results, a bionic thin cantilever structure was proposed. All the works can be concluded as follows:(1) A micro-force testing system was designed and the elastic modulus of the vein and membrane of the dragonfly wing were obtained with this machine.(2) The 3DSS optical scanner was used to scan dragonfly wing and the obtained point cloud was turned into the wing surface by the reverse engineering software Geomagic, and then three-dimensional dragonfly wing model was constructed with Pro/E and the true 3D model was imported into ANAYS for finite element analysis.(3) Three structure models-the full wing model, the model with only veins and the model with only membrane were studied with ANSYS. The beam189 element was used to simulate wing veins and the shel143 element was used to simulate wing membrane. The stress, strain and deformation in these three case were obtained and compared and the advantages of dragonfly wing were summed up.(4) The dynamic properties of the dragonfly wings were studied both by experiment and finite element methods. The first three natural frequencies and model shapes of dragonfly wing were tested by Doppler vibrometer and were compared with those caculated by the finite element analysis, the natural frequencies are relatively closed, model shapes were basically the same. The first vibration model was vertical bending, the second vibration model was bending plus torsion around the vertical centerline, the third vibration model was torsion around the vertical centerline.(5) Six bionic thin cantilever structure models were proposed, based on the above investigation. These six models were analysed mechanically under the concentrated force. Compared with their deformation, a more advantage structure pattern was suggested. |
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