Abstract：The line-spectrum vibration generated by heavy marine power units is one of the important sources of underwater noise. In real applications, vibration isolation pads are usually inserted between the vibration source and the flexible base to suppress the propagation of broadband vibration. In order to effectively control the complicated vibration transmission paths in a vibration isolation system, a new type of active/passive vibration isolator is proposed. The active control is able to attenuate low-frequency vibration transmission on the basis of the passive vibration isolation. The active/passive vibration isolator can suppress vibration transmission in multi-degrees of freedom and resultingly eliminate incomplete cutting of vibration transmission paths. The static and dynamic characteristics of the passive vibration isolator were analyzed and tested. The effectiveness of active control was experimented. Simulation and experimental results show that the active/passive vibration isolator can significantly suppress the harmonic vibration of the flexible foundation by combining the weighted error feedback adaptive control algorithm and the multi-degree-of-freedom synchronous control.
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