That was a great watch. I love how the next step in competitive Tetris means the player will need to learn which moves won’t crash it so you can get to the final level. How cool.
Honestly, for me, the best part about this, is how excited the person they were competing against was for them. They didn’t care that they didn’t get it, they were happy for their competitor. That was awesome.
And then you might still get arrested for “impeding an investigation” and “failure to comply” even though your constitutional rights allow said non-compliance.
Then you get fired because you had to sit in jail until the charges are dropped, and suddenly your foodstamps agent audits you so you lose a week of access to food on top of it all!
I work with telecom cables. This happens when the cable isn’t rotated when hung. If it’s hung without any rotations the wind catches it and it’ll dance like this
This is most likely due to a differing tension between that span and the spans on either side of it. It has more “sag” (even if only fractionally different) therefore it is more susceptible to what I referenced above.
I assume that line is communication, and the tension on them is enormous. Did you happen to get a closer look at the spiralling on it? I can’t tell by this video if it’s armouring or a grip.
For what it’s worth: I counted about 85 or 86 “clicks” in 10 seconds. It’s a loud click followed by a quieter click, like as if it’s oscillating towards and away from you. The sound of the click itself is loudest at about 2.6 khz - whether that is simply the sound of friction, or some sort of electrical phenomenon, I don’t know.
The fuzzy area at the bottom half of the spectrogram is the dull roar of distant wind. The clicks themselves show up as spikes, and the intense colors on the right are from where the voice starts speaking. The dark band above 10K is just the data lost from audio compression.
Well, I can say definitively that I know what is making that clicking sound. It’s hard to see since the cable is in silhouette, but there are silver-colored spirals wound around the cable, and the sound is made by the plastic sheathing of the black cable wobbling inside of those metal spirals. The spirals are made of aluminum, I’m pretty sure. Those spirals are put there to stiffen the the hanging cable, and appear on the hanging cable between every set of poles (not just these, that are wiggling). There are two spirals mounted on each cable between the poles. I assume the spirals are mounted there to provide damping, just in case the wind does cause the cable hanging between the poles to swing too much. But, there was no wind blowing when I shot this video (Dec 5, 2023). The voice you hear is mine, just speculating on what might be causing the oscillating cable…
Did you measure the distance between the poles? I suspect it’s different from all the other spans, so this one happens to have a resonant frequency that exactly matches whatever vibration source is already there (could be the tension too). As for sources of vibration, wind is probably it, even if it’s not strong. If it just happens to create the right frequency, the cable will vibrate just like a violin string.
I immediately thought of the original Tacoma Narrows Bridge, which collapsed after wind caused a resonance to build up and literally shook itself apart: en.wikipedia.org/…/Tacoma_Narrows_Bridge_(1940)
No, I’ve never tried to quantify the variables in that way. Just out walking the dog, and notice this strange behavior from time to time. I always assumed the poles were placed a specific distance apart, but honestly, I’m not sure. I suppose if I ever have the urge to pace it out to get a good estimate, I will…
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