Equivalent modeling and dynamic analysis for large flexible space truss structures

Large flexible space truss structures have features of periodicity, large flexibility and complex configuration, their equivalent modeling is one of key techniques to design vibration controllers. Here, based on the energy equivalent principle and the classical Timoshenko beam theory, equivalent modeling and dynamic analysis were conducted for a large space flexible positive triangular prism truss structure with rigid joints. Taylor expansion method was used to derive its equivalent beam model's stiffness and mass expressions, and the natural vibration characteristics of the truss structure and its equivalent beam were analyzed contrastively. Both of them agreed better with each other. The numerical results showed that the proposed equivalent approach is effective; the equivalent beam model has a higher accuracy. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.