Design and Application of Tuned Mass Damper using Magneto Rheological Fluid for Vibration Control of Structure in Power Plant

When several pulverizers operating simultaneously at the same rotational speed for coal pulverization in a thermal plant, workers inside the nearby control structure complained of discomfort due to the vibration. Through structure and transmission path vibration measurement the phenomenon of vibration amplification in the structure due to resonance and the concentration of vibration energy in the roof due to structural characteristics were identified. To reduce the vibration in the control room, the design of the main factors of the TMD(Tuned Mass Damper) was conducted. An analysis of the optimal mass, stiffness, and damping characteristics of the TMD was designed using a finite element analysis program ANSYS. MR(Magneto-Rheological) fluid was used for the damper of the TMD for the optimal vibration reduction effect considered to the site conditions. The optimal position of the TMD in the structure was selected, and the reduction effect was verified by conducting vibration monitoring before and after installing the vibration mitigation measures.