Tuned Mass Dampers

Tuned Liquid Dampers   Tuned Mass Dampers   Damping Pads 

 Vortex Shedding     Helical Strakes 

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The Tuned Mass Dampers (TMD's) utilize mass to provide the damping.  The dampers are "tuned" to the natural frequency of the stack so that they are most effective at or near the natural frequency of the stack.  

The Tuned Mass Damper consists of a cylindrical ring of steel mass, which is suspended by cables.  The ring is larger than the diameter of the stack, and is separated from the stack with coils of cables which serve as springs. 

Advantages: 1) All Mechanical Parts 2) No problem with high temperatures 3) Inspected from grade with Binoculars 4)  Provides large structural damping

Disadvantages: 1) Must be full 360 Degrees 2) Needs to be near top of stack. 3) Can not serve dual purpose (i.e platform)