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Civil and Architectural Engineering

College of Engineering and Applied Science

Alcoa Dumbbell Damper



Alcoa Fujikura, Ltd. manufactures a "bus damper" that is used for tubular busses in electrical substations. The damper had a multi-wire cable with two 6.9 lbs (3.1 kg) weights suspended from the each end of the cable. As the weights oscillate at the end of the cable, friction between the wires dissipates energy. The period of the dumbbell damper was measured to be approximately 0.8 sec.

alcoa


Damping Results


In-Plane Response

Non-retrofitted Pole

LBB

Retrofitted Pole

L96

Out-of-Plane Response

Non-retrofitted Pole

FMB

Retrofitted Pole

9OT



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