Mechanical Properties And Driving Method Of Four-point Star-shaped Zero Poisson’s Ratio Honeycomb Structure

The traditional design of underwater gliders is to optimize the work efficiency in a single task and environment.It is difficult to achieve optimal work efficiency during all conditions,so it cannot meet the diversity of work tasks and adapt to the complex work environment.Deformable wing has become a newly emerging technology,which can adjust its own structure according to different working environments,reduce energy consumption,and has the best navigation performance in the whole working range.It also can quickly switch the wing shape between multi-tasks.The adaptive support structure and efficient driving device are always the essential and difficult problems to realize the morphing wing.Aiming at the above technical requirements,this paper proposes a threedimensional honeycomb structure with zero Poisson’s ratio effect,which is combined with the pneumatic muscle fiber as the driving device,and designs a flexible honeycomb structure with active deformation.The integration of actuation and deformation of the honeycomb structure is preliminarily realized,and finally verified by the honeycomb driving deformation control experiments.The related research results of this dissertation provide a theoretical basis for the development of underwater glider’s morphing wing.In order to realize the adaptive support of the wing deformation,based on the previous research,a three-dimensional expansion of the four-point star-shaped honeycomb structure is presented.The structure can deform in the three principal directions of space,and maintain the smooth boundary continuity and isotropy of the honeycomb in the whole deformation process.Theoretical optimization,finite element simulation analysis and experimental test are conducted to verify the validity of the theoretical model,and the influence of honeycomb cell geometry parameters on the macro mechanical properties of the structure is discussed.The zero Poisson’s ratio effect of structural deformation is verified in the finite element analysis and experimental aspect,which provides a theoretical reference for the selection of honeycomb structure and multi-objective optimization.With the development of deformable wing technology,researchers have developed different wing deformation methods.To realize the application of the honeycomb structure on the deformable wing,a flexible and deformable honeycomb is designed in this paper with the combination of pneumatic muscle fibers.Experiments were carried out on the deformation displacement and driving force of pneumatic muscle fibers,and the law of contraction rate changing with input air pressure was obtained.Through the design and deformation test of the driving deformation scheme,the control and pressure adjustment of the pneumatic muscle fibers,a variety of bending and contraction deformation driving schemes of the honeycomb structure is realized,and the feasibility of the multiple deformations realized by the flexible honeycomb is verified.It provides a reference for the application design of the honeycomb structure on the deformable wing of an underwater glider.