Structural vibration analysis and modeling of marine diesel two-stage vibration isolation mounting

The practical Diesel Two-stage Vibration Isolation Mounting (DTVIM) was constructed to improve vibration isolation technology. As an effective method, modeling was available to obtain most of structural vibration characteristics and helpful to improve vibration isolation of DTVIM. DTVIM was quite complex multi-structure coupling system, so it was divided into multi-subsystems, Mathematical differential representation of each subsystem was given, and dynamic transfer equation was constructed using state vector of generalized load and response. Vibration energy transmission was synthesized by transfer matrix method among multi-subsystems. Vibration energy averaging over the vibration period was primary dynamic parameter and applied to describing vibration of subsystem and analyzing passive vibration isolation of DTVIM. On base of modeling of passive vibration isolation of DTVM, active vibration control technology was introduced to realize the hybrid control strategy. Thus Hermitian quadratic objective function was constructed, the optimal force for active control was gotten by minimizing the total average vibration energy. Structural vibration mechanism of the practical DTVIM was interpreted with combination of active control and passive control.