Tuned Mass Dampers
When designing a building that requires a large open space, the length of span can often be problematic. Similarly to bridges, large spans have a tendency to oscillate. The bigger the span, the lower the frequency, resulting in an increased amplitude of bounce. Low frequencies can easily be triggered and can make occupants feel uncomfortable or even unwell. Lightweight structures can also have low-frequency response with similar effects.
Tall structures can suffer from the same issues where the whole building sways. It is not always possible to design out the low frequency response of a building, particularly where low weight and or large spans are required. Xi have the capability to assess designs for the natural frequencies of structures and assess how they will behave when loaded. Xi can then design appropriate Tuned Mass Dampers (TMD) or Tuned Mass Absorbers (TMA) that can be used to counter the effects of structural resonance.
The principle of a TMD is relatively straightforward. A mass and spring are selected that have the same resonance frequency as the structure to which the device is to be attached. When the structure’s natural frequency is excited, the TMD responds at the same frequency; though out of sync and in the opposite direction. The result of this, when coupled with suitable damping, can prevent the structure from responding excessively at its natural frequency thus bringing stability to the structure.