[Antennas] Re: Antenna Vibration (perhaps tower vibration)

[Wes (N7WS) and Linda]

At 01:30 AM 1/22/2003 -0500, Barry L. Ornitz wrote much good stuff:
[snip]
>
>With a tower this large, an audible vibration is unlikely if 
>the entire tower is vibrating.  With that much mass, you would 
>need an exceptionally rigid structure to get resonance at that 
>high a frequency.  And just because an object vibrates does 
>not mean it is going to be destroyed by metal fatigue.  As 
>long as the vibrations are within the elastic limits of the 
>vibrating components, fatigue does not occur.  

Normally it's bad practice to argue with a PhD, but this time I can't help
myself. :)

This just didn't sound right, but it's too early in the morning to call up
my metallurgist friend, so a quick Google search finds among others this:

http://www.foxvalleyspring.com/Glossary.asp

Fatigue Failure  - When a spring is deflected continually, the metal
becomes fatigued and failure may occur at a stress level far below the
elastic limit.

Wes  N7WS