The simulation of vibration control of offshore platforms under earthquake loadings is performed in this paper by using the ANSYS software, in which the first three order natural frequencies of the platform are controlled by the ETMD system where the parameters of the system are taken in the optimal regions. The results show that the ETMD system can reduce the vibration of the platform effectively under earthquake loadings. Another important conclusion is that reasonable control effects can be obtained by control the first order natural frequency. There are 10% and 20% increase in y and z directions when the first two and three order natural frequencies are controlled simultaneously.

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