B Tuned mass dampers in Taipei 101

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Tuned mass dampers in Taipei 101 are designed to counteract the effects of earthquakes by shifting in opposition to the building's movement. When the building sways, the damper moves in the opposite direction, helping to reduce oscillations. The discussion raises questions about whether the damper's movement constitutes an internal force and how it affects the overall center of mass. It is clarified that while the damper's movement does influence the center of mass, the primary function is to create a delay that dampens oscillations. The effectiveness of the system lies in its ability to counteract external forces, rather than merely shifting internal components.
anonymous24
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Hello,
When I was in lesson today, our physics teacher mentioned a device called tuned mass dampers in Taipei 101 to reduced the effect of earthquakes. What he said is that when the building shifts to the right, and there will be a mechanism for the big ball (the damper) to shift to the left to counteract, and vice versa. The question I have is that wouldn't the shift of the damper be an internal force, so how does that changed anything resulted by the earthquakes waves, an external force. I mean the movement of the damper should not shift the centre of mass if the whole thing. Thanks in advance.
 
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A heavy mass up near the top so that when the base is shaken the building doesn't sway as much as it otherwise would. I don't know specifically about tuning, just that you would need to be mindful of its natural resonances.
 
anonymous24 said:
I mean the movement of the damper should not shift the centre of mass if the whole thing.
Of course it does, but that isn't the point. Rather the delay and thus movement in counter phase to dampen the oscillation.
 
A.T. said:
Of course it does, but that isn't the point. Rather the delay and thus movement in counter phase to dampen the oscillation.
why would the centre of mass of the damper+the building change if we just move the damper, aren't they the internal force of the same system
 
anonymous24 said:
why would the centre of mass of the damper+the building change if we just move the damper
If only the damper moves, then the centre of mass of damper+building also moves. But that isn't even what is happening or the point of the system.
 

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