Geometrically nonlinear analysis of resonant vibrations of the frame model of the superstructure during pitching

The work is devoted to the creation of a complex of computational models of hydrodynamics and strength describing the behavior of a small research vessel (NIS) under construction by the student design bureau of SPbGMTU [1]-[3]. Modeling of the behavior of a light flexible fiberglass boat superstructure, which is a spatial complex frame and designed to accommodate a massive and rigid tier of photovoltaic panels on it, is considered. The design for such a design is the inertial loads during the rolling of the vessel. Low structural rigidity makes it necessary to analyze the vibrations of the structure in a geometrically nonlinear formulation to identify the true response amplitudes in the nearresonance zone, strength and stiffness reserves, and the possibilities of increasing them when using rigging. In the first approximation, the behavior of a flat frame without braces and with braces is analyzed for the case of a high-amplitude harmonic rotation of the reference plane, simulating a side pitching. Analysis of resonant vibrations of the frame model of the superstructure during pitching