Friday, February 19, 2010

The Stockbridge Damper

A Stockbridge damper is a tuned mass damper used to suppress wind-induced vibrations on taut cables, such as overhead power lines. The dumbbell-shaped device consists of two masses at the ends of a short length of cable or flexible rod, which is clamped at its middle to the main cable.It is placed about midway between the nodes of the vibrations i.e. where amplitude of the vibrations would be more. The vibration causes movement of the damper and energy is absorbed by the inter stand friction in the steel cable. The vibrations have low amplitude up to 5mm and high frequency of 50Hz-100Hz. A typical damper for use on a 132kV line is about 60cm long and weighs about 5kg.

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