Abstract: Two-stage vibration isolation system, which is divided into substructures and dynamic transfer matrixes of those substructures are constructed, is the objective system, average vibration energy is adopted as objective function and power flow method is used to assemble transfer matrix of system, thus realizing vibration transmission mechanism investigation of passive vibration isolation. Based on passive vibration isolation process, actuator is installed between upper vibration isolator and intermediate mass, and vibration transmission mechanism investigation of active and passive vibrations isolation of the objective system is realized by optimizing quadrics objective function. By considering the parameters of practical two-stage vibration isolation system, numerical simulation and experimental research are carried out in order to obtain multi-vibration transfer path energy distribution and realize investigation of vibration transmission properties of the system, whose results show that the dominant modes, dissipation characteristics of coupling and damping, and disturbing excitation, determine multi-vibration transfer path energy distribution and vibration transmission properties.

Key words: Dynamic transfer matrix, Power flow, Two-stage vibration isolation, Vibration energy, Vibration transmission