Correction of analytical model for lateral-staging rocket with modal data using hybrid optimization algorithms

One of the basic modern approaches to design and development of comprehensive aerospace systems lies in implementing the methods of mathematical modeling. Accumulated experience demonstrates that direct simulation of real objects in the general case is not ensuring required quality of the relevant analytical models. Design and development of efficient numerical methods for correction of the systems’ mathematical models using modal data obtained experimentally is a topical area of research. Inverse problem of correcting parameters of an analytical model of the liquid-propellant rocket using modal data is considered. Propellant fluidity in fuel tanks during the body bending vibrations is simulated by a system of oscillators. Analytical model is discretized by the finite element method. Solution of the inverse problem was obtained using the optimization approach. Two new hybrid algorithms of the global non-differentiable optimization are presented. Numerical example of correcting the interblock connection belts for a rocket with the lateral-staging layout scheme is provided. Analysis of the results obtained makes it possible to make a conclusion that the proposed approach is possessing sufficiently high efficiency.