Vibration Control of Jacket Platforms by DTMD System

The turned mass damper (TMD) system has found extensive applications in vibration control nowadays. The main disadvantage of the system is to add additional mass to the structures. In order to make use of its merits and overcome its disadvantage, the developed turned mass damper (DTMD) vibration control system is studied in this paper. It uses the equipment set on the structure instead of additional mass to control the vibration of structures. The theory analysis shows that the frequency range is enlarged and the resonant band is reduced with the mass ratio increasing. The FEM simulation shows that the DTMD vibration control system could absorb more vibration energy when the frequency of the DTMD is near the excitation frequency. The platform has better vibration control effect when the mass ratio between 3.75 and 5 and when the frequency ratio is in the range of (0.3,0.35) and (0.35,0.5). The whole system, including the platform and the DTMD, has the smaller vibration response when the frequency ratio is between 0.5 and 2. The results of the simulation also showed that the DTMD is more effective in the vibration control for the jacket platforms.