A prediction method for the dynamic environment of spacecraft based on the component mode synthesis

The dynamic environment of spacecraft is generally used to describe the level of the excitation on the spacecraft itself and the auxiliary equipment. Therefore, the dynamic environment of spacecraft is a criterion for the structural dynamic design as well as the ground verification test, the reliability assessment of the spacecraft themselves and the auxiliary equipment. However, two major problems are suffered in the prediction process: one is the high time consumption for solving the high-dimensional dynamic equations due to the huge amount of degrees of freedom; the other is the structural dynamic models of different components of spacecraft are usually obtained through different approaches, such as analytical expressions, numerical simulations and modal testing. The work presented in this paper is a low frequency prediction method for dynamic environment of spacecraft based on the component mode synthesis method. The results indicate that the proposed low frequency prediction method is cheap and efficient in comparison with the traditional prediction technology using the finite element method.