In these days, structural vibration and noise are hot issues in underwater vehicles such as submarines for their survivability. Therefore, active vibration and noise control of submarine, which can be modeled as hull structure, have been actively researched using various types of the actuators. In this work, advanced anisotropic piezo composite actuator named as Macro-Fiber Composite (MFC) is adopted for reducing the vibration of stiffened hull structure. The MFC actuator can provide great flexibility, large induced strain and directional actuating force. Firstly, the dynamic modeling of the stiffened hull structure and actuating performance of MFC are derived by finite element method considering underwater condition. Then, by using the finite element results, the dynamic model of the underwater stiffened hull structure featured by MFC actuator is established. In order to suppress the vibration of hull structure, a couple of control algorithms (linear quadratic Gaussian control, sliding mode control) are designed and implemented. After then active vibration control performance of the proposed stiffened hull structure is evaluated via computer simulation. The vibration control results are presented and compared under different control schemes in time domain.
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