resonance induced street pole shake?

[gychang]

I live in San Diego, California. I noticed a street pole shakes near my home, apparently for several months. I put up a video here:

Apparently leading theory seems to be acoustic in nature, for last several months shake had been more apparent. With rare rain here (drizzle today), I noticed the shake is very minimal. For acoustic engeneers is this sound/traffic noise induced street pole shaking?

 

[kcdonahue]

FYI. The video is not accessible unless you have a next door account. Maybe post to youtube or other more accessible site?

 

[rayma]

Probably through coupled ground vibration due to traffic, not through the air.

 

[gychang]

FYI. The video is not accessible unless you have a next door account. Maybe post to youtube or other more accessible site?

thank you, I moved the video to youtube.

 

[daqvin_carter]

Is that pole made of aluminium? The base does not look loose like I have seen in some cases. I am guessing the mass at the top and a pole that can bend is what is in play here.

 

[gychang]

Is that pole made of aluminium? The base does not look loose like I have seen in some cases. I am guessing the mass at the top and a pole that can bend is what is in play here.

I am guessing it is not aluminum but a thin steel? Base was not loose at all...

 

[lcsaszar]

It must be wind induced throgh vortices. Similar to this:

 

[Galu]

It must be wind induced...

Like the Tacoma Narrows Bridge?

https://www.bing.com/videos/search?...7C9722319D772261CAD27C9722319D77226&FORM=VIRE

 

[gychang]

It must be wind induced throgh vortices. Similar to this:

amazing, leaves near by not moving..., wonders of nature.

 

[Galu]

"A small boy, by each time adding a pound to the force with which a 200-pound man swings, can soon set the man swinging with the force of 500 pounds. It is necessary only to keep adding a little force at the right time." Nikola Tesla – the master of resonance.

 

[Galu]

It must be wind induced throgh vortices.

I researched this further and discovered the 'von Kármán vortex street'! 😵

https://aerospaceengineeringblog.com/the-von-karman-vortex-street-and-tacoma-narrows-disaster/

"Each time an eddy is shed from the cylinder, the symmetry of the flow pattern is broken and a difference in pressure is induced between the two sides of the cylinder. The vortex shedding therefore produces alternating sideways forces that can cause sideways oscillations. If the frequency of these oscillations is the same as the natural frequency of the cylinder, then the cylinder will undergo resonant behaviour and start vibrating uncontrollably."