Creation of Mechanical Analogs of Space Rocket Substructures Taking the Active Forces Acting on Them into Account

We consider the problem of modeling hydroelastic oscillations of liquid fuel in the tanks of launch vehicles with the use of mechanical analogs. Here, it is important to ensure the applicability of the computational model with mechanical analogs to the real object in terms of the mass-inertial and dynamic characteristics. In addition, it is necessary to ensure the correct modeling of the external active forces acting on a tank when it is modeled by mechanical analogs. The proposed approach can be applied in a simulation of fire stand tests (FSTs) of propulsion systems, when the engine is mounted on the truss structure to the tank’s dome and in the analysis of loads on the prospective reusable stages of launch vehicles.