Design of the Interval between Reaction Mass and Foundation in Vibration Test System

The dynamic model of the reaction mass system in the large-scale vibration test system is set up, and the crossover frequencies are calculated in order to determine the operation capability and the interval between reaction mass and foundation. On the basis of the finite element method (FEM) analysis and theory of analysis mechanics, the dynamic response of the reaction mass is studied. The results show that the maximum amplitude of the dynamical system is obtained at the natural frequency of the system. The results of theoretical and FEM calculations indicate that the maximum displacements responses are all much lower than the design of the interval, which means the design is satisfied and reasonable. This method can calculate the operation capability of the reaction mass effectively and can be used for vibration test system design and optimization.