Eddy Current Dampers

https://www.tiantiebuilding.com/products/eddy-current-dampers.html

An Eddy-current tuned mass damping device is composed of mass blocks, rigid connecting elements, elastic elements, linear bearing guide elements with less friction and eddy current as damping elements.
Features of Eddy Current Dampers
No friction
The loss of the whole structure is reduced.
Stable performance
The service life is the same as that of the architectural design