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Old 10-25-2016, 11:21 PM   #21
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This would be resonance, kind of like jumping on a trampoline


I can't picture it affecting only one row of lights but I guess I couldn't rule it out. Hang a little caution tape on the corners of the lights and you'll get a clue about what the air currents are doing. I guess the air could be pulsing and make a resonant effect...
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Old 10-26-2016, 12:22 AM   #22
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A steady stream of air movement caused by a AHU would tend to hold the fixture(s) slightly offset of directly under their support cables.

The airstream would have to oscillate to create the swinging motion.

Regardless, more mass will dampen the movement caused by whatever force is acting upon it.

A video clip would be nice.
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Old 10-26-2016, 12:28 AM   #23
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Quote:
Originally Posted by MikeFL View Post
A steady stream of air movement caused by a AHU would tend to hold the fixture(s) slightly offset of directly under their support cables.

The airstream would have to oscillate to create the swinging motion.

Regardless, more mass will dampen the movement caused by whatever force is acting upon it.

A video clip would be nice.
This is especially true when the mass is attached in the middle -- somewhere -- of the stretched material. ( The wire is in tension, of course. )

This is the actual technique used to un-tune suspension bridges.

Yes, I was not guessing.
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