Abstract
An efficient and accurate method was proposed for dynamic characteristics prediction of launch vehicles based on the equivalent beam model, with which the influence of liquid propellants can be considered. The equivalent beam model for the launch vehicle was established based on the cross-sectional area equivalence principle, and improved through model updating against the natural frequencies and mode shapes of the fine finite element model. The present method was validated through computation of a certain type of launch vehicles. A highly representative equivalent beam model for the launch vehicle was established. The dynamic characteristics of the launch vehicle were predicted based on the equivalent beam model under the influence of liquid propellants in 2 ways of the lumped mass method and the coupled mass method, and the results were compared.
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