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Civil and Architectural Engineering|College of Engineering and Applied Science

Hapco Impact Damper

Hapco manufactures an impact damper that is successfully used on luminaires to suppress high frequency modes caused by vortex shedding. The damper is constructed from a 2-in (51- mm) diameter aluminum pipe with a rod/teflon ring placed loosely inside. As the pipe vibrates laterally, the teflon ring impacts the inside of the aluminum pipe.


Damping Results

In-Plane Response

Non-retrofitted Pole


Non-retrofitted Pole


In-Plane Response
Out-of-Plane Response

Retrofitted Pole


Retrofitted Pole


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