Parameter Identification Of Liquid Sloashing Equivalent Mechanical Model In Satelite Tank

Liquid sloshing problem exists widely in the development of launch vehicles, satellites, spacecraft, space shuttles and space stations. With the development of the aerospace industry, An aircraft carries more propellant, which causes more prominent liquid sloshing problems. Therefore, it is of great significance to study the problem of liquid sloshing equivalent mechanical model. Based on the result of simulation with Fluent software, an improved polynomial fitting method and genetic algorithm are used to identify equivalent mechanical model parameters in frequency domain.The main contents are as follows:(1)The dynamic equations of liquid sloshing based on the potential function is given. Obtained parameters of small amplitude sloshing in cylindrical tanks, using the separation of variables method. And the calculation formula of the equivalent mechanical model parameters is given.(2)The numerical simulation of liquid sloshing with VOF method is conducted. Liquid sloshing forces and moments acting on the tank is obtained and analyzed.(3)An improved polynomial fitting method to identify equivalent mechanical model parameters in both frequency domain and time domain is proposed. And the method is extended to the parameter identification of any shape tank.(4)The genetic algorithm to identify equivalent mechanical model parameters in frequency domain is proposed.This paper has reference value to the structural design of liquid tanks, as well as the parameter identification of the liquid sloshing equivalent mechanical model.