Research On Aircraft Deformation Skeleton Based On Tetrahedral Truss

Compared with traditional stationary aircraft,the variant aircraft has the ability to adjust its own shape in real time depending on the flight environment and mission,makes its flight performance optimal.At present,European and American countries have conducted more in-depth research on variant aircraft,and domestic research in this field is still in its infancy.From the current research results,it can be seen that the research on the variant aircraft is mostly focused on the deformation of the wing,and the implementation method basically adopts smart materials combined with the traditional mechanical structure.Although such methods can achieve distortion,overall,Because smart materials are more sensitive to the environment,and the structure of traditional machinery is more complicated,the cost performance is not obvious.Therefore,it is of great significance to design and propose other deformation structures as the basic skeleton of the aircraft.This paper is inspired by the series structure of triangular plates.On this basis,tetrahedral truss elements are used in place of triangular plates to increase the stiffness and stability of the structure.At the same time,linear displacement actuators are installed in the appropriate positions of the linear structure,which enables the realization of the mechanism.Bending and torsional deformation;At the same time,the design proposes a spherical joint that effectively connects the tetrahedral truss units,and analyzes the relationship between the geometric parameters and the range of motion.Based on the ability of the tetrahedral linear truss to be bent and torsionally deformed,it is used as the wing body structure of the aircraft.The change of position and posture of the wing is analyzed by the D-H coordinate transformation method;the truss wing is analyzed based on the method of movement influence coefficient.Kinematic parameters.The equivalent dynamic model was established.The finite element method was used to obtain the natural frequencies and mode shapes under the constraint conditions.The factors affecting the rigidity of the unit and the overall truss were analyzed preliminarily.The dimension parameters of the tetrahedron truss structure are optimized,and a deformed wing prototype based on a tetrahedron truss structure is designed.The movement test is performed and the expected deformation is achieved.Several plane deformation structures based on tetrahedron truss elements are further proposed.The kinematic performance is analyzed briefly from the perspective of the degree of freedom of the mechanism,and a better structure is obtained.The structure can achieve bending and bulging deformation;The coefficient method analyzes the motion characteristics of the basic unit and provides a theoretical reference for the subsequent design of the deformed body.