Modeling of composite mesh adapter for Marathon satellite system spacecraft output

Composite shells of rotation of mesh type are often used in the production of rocket and space technology as power elements of structures for various purposes, including spacecraft hulls. High specific values of mechanical characteristics of composites allow to manufacture structures with a high degree of weight perfection. Usually composite mesh structure has the form of a cylindrical or conical shell of circular cross-section and consists of a system of spiral and circular ribs running along the midpoints of the areas between the nodes of intersection of spiral ribs. The discrete structure of the mesh shell is relatively simple and can be manufactured by the method of continuous winding of composite fibers, which is very technologically advanced, well-established and therefore currently widespread. A characteristic example of anisogrid cylindrical and conical shells is the spacecraft adapter for GLONASS satellites orbit launching, different variants of which are still produced in the workshops of Reshetnev JSC. The shells differ in dimensional parameters (diameters and lengths) and bearing capacity, but they are structurally identical, which allows to develop a universal and maximally automated modeling and calculation procedure. This is extremely important for composite elements of rocket-space technology, which have numerous variable parameters. The optimal combination of these parameters is determined in the process of performing a complex numerical experiment. The composite mesh adapter considered in this paper, designed for the Marathon satellite orbit, differs from the previously used shell structures by the shape of the cross-section, which in the main part is a regular octagon. The previously developed algorithm for modeling an anisogrid structure with a system of spiral and annular ribs formed by unidirectional carbon fiber-reinforced plastic fibers is used. Numerical investigation of stability, stiffness and stress-strain state of the structure is carried out in the environment of an integrated package of finite element programs while varying the main parameters of its mesh structure formation.