(57) An eigenfrequency oscillation dampering unit (1) for a tall construction is disclosed.
It comprises a support structure (3) under a mass member (5) and receiving the mass
member (5), and the support structure (3) presenting a first spherical feature(7).
The mass member (5) presents a second spherical feature (9) matching the first spherical
feature. The first and second spherical features (7, 9) present a radius corresponding
to a length of a mathematical pendulum, wherein the radius is related to an eigenfrequency
of the tall construction. The first spherical feature (7) and the second spherical
feature (9) presents an essentially common center point. A contact means (11) is arranged
on one of the mass member (5) and the support structure (3), and between the first
spherical feature (7) and the second spherical feature (9), allowing the mass member
(5) to move in relation to the support structure (3). Non limiting Applications of
the present invention include a windmill, a chimney, and a building.
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