Windmill support structure
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United States of America Patent
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-
Sep 4, 1984
Grant Date -
N/A
app pub date -
Jan 24, 1983
filing date -
Jan 24, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A windmill installation (10) includes a windmill (12) supported on a tower (18) that includes three legs (20, 22, and 24). The connections of the legs (20, 22, and 24) to their respective bases (36, 37, and 38) are provided by compliance members (30, 32, and 34) that are compliant enough that the natural frequency of axial bending of the windmill installation is less than the frequency with which blades (14) of the windmill (12) pass behind the tower (18). Also, a windmill compliance assembly (28) provides the connection between the windmill (12) and the tower (18) and has enough compliance that the natural frequency of pivotal bending is also below that frequency. As a result, vibration at a resonant frequency of the structure is avoided during normal operation.
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