[HN Gopher] What Is "Induced Atmospheric Vibration"?
___________________________________________________________________
What Is "Induced Atmospheric Vibration"?
Author : belter
Score : 126 points
Date : 2025-04-29 12:30 UTC (1 days ago)
(HTM) web link (physics.stackexchange.com)
(TXT) w3m dump (physics.stackexchange.com)
| belter wrote:
| "Diagnosis and Mitigation of Observed Oscillations in IBR-
| Dominant Power Systems - A PRACTICAL GUIDE" -
| https://www.esig.energy/wp-content/uploads/2024/10/esig-rpt-...
| juancn wrote:
| "Real electrical systems have to deal with issues of reactance
| and other exciting math-heavy constructs designed to drive you
| into some other field of study."
|
| They had me at this
| SoftTalker wrote:
| Wonder how much complexity using AC adds to this? With DC you
| would not have to worry about frequency and phase matching. But
| then you need to convert the DC back to AC at some point.
| Cthulhu_ wrote:
| Some parts of the energy transmission grid are DC, but looks
| like it's mainly international, undersea, and long-range
| transmissions: https://en.wikipedia.org/wiki/High-
| voltage_direct_current
| sam_lowry_ wrote:
| And only because long-distance transmission is more
| efficient.
| raverbashing wrote:
| > Wonder how much complexity using AC adds to this?
|
| Summarizing a couple of year of very annoying electrical
| studies: Yes
|
| You can't believe how much
| formerly_proven wrote:
| On the other hand, having a continent-scale AC grid is not
| just possible but common. Europe and North Africa have one,
| Russia has one, China has one, the US has two or three.
| Meanwhile multiterminal HVDC is basically experimental
| stuff that's only possible with real-time digital control
| systems.
| raverbashing wrote:
| Having a worldwide data network is also only possible
| with real-time digital control systems as well
|
| The issue is one of technology (having high powered
| switching components only took of in the last 30? yrs or
| something) and legacy
|
| (Edit: IGBTs are from the 80's though it seems the 1st
| generation wasn't that great, IGCTs from the late 90s
| https://mb-drive-services.com/experience-with-igct-based-
| vfd...
| lazide wrote:
| (Efficient) High voltage AC is 'easy' due to how well
| transformers work, how durable they are, and how simple they
| are. AC does have issues with inductive loss when buried (or
| near anything conductive), however. For the same reason
| Transformers work and are awesome.
|
| High voltage DC is hard as it requires solid state components
| which are expensive to make, and prone to blowing up (aka
| relatively fragile). AC to DC and vice versa also adds non-
| trivial losses.
|
| High voltage DC (to a first approximation) doesn't suffer
| from inductive losses however, which makes it much more
| efficient when near conductive stuff like the ground or
| seawater.
|
| It's also 'simpler' (doesn't have things like phase or
| frequency) which is convenient if doing things like
| transferring power between two power grids with dissimilar
| frequencies or phase.
|
| They each have their place.
| thmsths wrote:
| I believe high voltage DC also does not suffer from skin
| effect. Meaning that the current is transmitted through the
| whole conductor, not just the surface, leading to less
| material needed for the same current rating.
| mannykannot wrote:
| I imagine AC makes things considerably more difficult.
| Reactance is a consequence of inductance and capacitance,
| which cause current and voltage changes to be out of phase
| with each other. While the current on a DC transmission line
| will vary, it will not be reversing every ~10 milliseconds,
| and I suppose the voltage will be very steady except during
| startup and shutdown.
|
| On an AC transmission line, I suppose any corona discharge
| going on shuts off and restarts every time the voltage
| reverses. They make a characteristic buzz in humid
| conditions.
| idiotsecant wrote:
| That's easy enough to say but big iron power electronics are
| orders of magnitude more expensive than copper windings and
| magnetic steel laminations , both in terms of capital cost
| and maintenance. It's also _dramatically_ harder to
| extinguish DC arcs so switching gear and substations need
| more expensive designs as well. The grid could not exist at
| present, let alone 100 years ago, if we operated it all DC.
| Over time more and more of it will shift to DC, particularly
| for long haul, but AC has enough advantages that 's it's
| unlikely to ever go away.
|
| I'm short, it's this way for a reason. The complexity is
| nessessary.
| thenobsta wrote:
| All of it, I guess. That phasor is always complex.
| codethief wrote:
| Ha, I was waiting to see a comment with the obvious pun to
| be made here. :)
|
| For non-physicists: https://electronics.stackexchange.com/q
| uestions/128986/why-u...
| formerly_proven wrote:
| I think the contrary is true. Frequency and phase matching is
| a feature, not a bug. Because AC gives you frequency, and
| frequency is not just easy to measure but also easy to have
| accurate references and very immune to noise, it is also not
| influenced by step-up/step-down transformers. This makes
| balancing an AC grid possible. Frequency below the set point?
| Increase power output. Frequency above? Reduce. As an added
| bonus, this happens to exactly match up with how synchronous
| generators work. So you get a fairly robust way for many
| distributed power plants to collectively coordinate power
| output _without additional communication_ just by agreeing on
| the physical quantity which we can measure with the highest
| precision of any quantity very cheaply.
|
| That is not possible with DC.
| sam_lowry_ wrote:
| Bingo! So many people miss this.
| f1shy wrote:
| DC comes with another 1000 problems. It wouldn't be any
| better, really.
| belter wrote:
| Reactance is such a beautiful French word...It just reminds you
| of some frustrated romantic attempts in a Paris scenario. :-)
|
| But your electrical supplier will charge you for it. Had a
| electrical power teacher with a past employment at a power
| supplier, who sadly loved to brag how he used to terrorize
| small farms when their own power generators had a cos ph below
| 0.98. I think the rule for Portugal is cos ph above 0.97 and
| for Spain 0.95 also known as el coseno de phi...
|
| "Cos-phi compensation" - https://fortop.co.uk/knowledge/white-
| papers/cos-phi-compensa...
| ANarrativeApe wrote:
| Excellent accessible explanation.
| formerly_proven wrote:
| All of these seem to be more or less conjecture on a seemingly
| lost-in-translation phrase though?
| Asmod4n wrote:
| Can this be mitigated by putting the cables under ground? Just
| curious, since it's a huge debate here at times because of the
| massive cost of doing so.
|
| Germany needs a connection from the coast into the south and most
| of it as of now will be build under ground.
| SoftTalker wrote:
| I had always heard that underground is workable for local areas
| but the really high voltage long-distance lines are hard to
| insulate undergound (on pylon towers they are not insulated at
| all).
| masfuerte wrote:
| High-voltage DC is frequently used for undersea transmission.
| This is necessarily insulated.
|
| https://en.wikipedia.org/wiki/High-voltage_direct_current
| schainks wrote:
| High voltage DC is effective above ground, too. At high
| enough voltage, it's actually cost effective and has fewer
| electrical losses than the AC equivalent. China has been
| doing some cool investments on high voltage DC in the past
| 15 years or so. We're talking 750 kV and above IIRC.
| lazide wrote:
| There are significant inductive losses with having AC under
| ground - dirt is conductive enough you end up with induced
| current (inductive losses) in it. Same with seawater.
|
| It's doable; but for longer distance runs when buried or
| under seawater, it's usually more economic using DC which
| doesn't have that issue.
| Cthulhu_ wrote:
| This article explains some issues with underground high tension
| cables [0]:
|
| > Laying a 380-kV high-voltage line underground poses a number
| of risks. The electrical behaviour of underground cables
| differs from that of overhead high-voltage lines. This results
| in a loss of transmission capacity. To compensate for this
| loss, additional devices (e.g. coils) have to be installed at
| various points along the route.
|
| > The combination of cables and coils creates resonance similar
| to a radio where multiple jammers continuously change
| frequency. Cables and coils can cause disruption locally,
| jeopardising the stability of the entire grid. In addition, it
| is easier for Elia to identify faults and carry out maintenance
| on overhead lines.
|
| [0] https://www.elia.be/en/infrastructure-and-
| projects/infrastru...
| Vox_Leone wrote:
| >>Can this be mitigated by putting the cables under ground?
|
| Yes, it can (apparently), since these are mostly indirect
| effects of atmospheric vibrations (aka 'wind'). The vibration
| itself isn't usually the root cause of a blackout -- but it
| sets off a chain reaction that leads to one (line contact/short
| circuit; conductor breakage; overcurrent & load shedding;
| protection system malfunction or overreaction, etc.)
| lurk2 wrote:
| You may find this video by Practical Engineering to be
| interesting: "Repairing Underground Power Cables Is Nearly
| Impossible"
|
| https://www.youtube.com/watch?v=z-wQnWUhX5Y
| schainks wrote:
| It's vastly more expensive to put cables underground, and high
| voltage cables underground is in the realm of Bad Ideas because
| you're putting a high voltage physically near the electrical
| ground (the earth's crust), which adds cost, reduces
| reliability, and poses a serious danger to all living things
| near the line.
|
| Sure, there may be exceptions that might make it worth while.
| However, if long distance high voltage underground wires was
| practical and cheap, you would see deployed much more often.
| goda90 wrote:
| My state, Wisconsin, has had a long political and legal battle
| over the construction of high voltage lines from the Madison area
| to Dubuque, Iowa. Opposition ranges from aesthetics to wildlife
| conservation to it just being a waste of money.
|
| One line of arguments I found intriguing is that the lines should
| be buried instead of on towers, for a multitude of reasons. The
| company building it would extract profit and then long term
| maintenance would fall on the state. If the lines were buried,
| there'd be less maintenance caused by weather events, less
| transmission losses, and overall more efficient and resilient
| operation.
|
| Obviously burying such lines has much higher up front costs and
| the companies looking to profit don't want to pay it.
| lurk2 wrote:
| > If the lines were buried, there'd be less maintenance caused
| by weather events, less transmission losses, and overall more
| efficient and resilient operation.
|
| You may find this video by Practical Engineering to be
| interesting: "Repairing Underground Power Cables Is Nearly
| Impossible"
|
| https://www.youtube.com/watch?v=z-wQnWUhX5Y
| bell-cot wrote:
| Here's the text version:
| https://practical.engineering/blog/2021/9/16/repairing-
| under...
|
| Noteworthy: That power line is only 10 miles long. Madison to
| Dubuque would be about 10X longer.
| toast0 wrote:
| > If the lines were buried, there'd be less maintenance caused
| by weather events, less transmission losses, and overall more
| efficient and resilient operation.
|
| It's a tradeoff. _When_ there is an issue with underground
| lines, it 's much more expensive to locate and diagnose the
| fault and repair it; in both dollars and time.
|
| In that area of the country, the ground freezes in winter, and
| digging becomes very difficult, which would make repairs that
| much more delayed and expensive.
|
| Also, depending on requirements, it may be possible to augment
| capacity ny adding a second transmission line to the existing
| towers at a later time; that would be much less expensive than
| setting up the first line; but for undergrounding, such a
| project would most likely be as expensive as the first time, if
| not more. Similar with replacing the line at the end of its
| service life (although if the line and the towers have a
| similar service life, replacing them both brings costs back up
| similar to the initial project)
| jonlandrum wrote:
| Why were all the answers provided by new contributors? Don't see
| that very often.
| belter wrote:
| Was posted less than 24 hours ago...
| jonlandrum wrote:
| That's not how Stack Exchange works, though. You don't have
| to register for a new account every time you leave an answer.
| The replies were all from new accounts, not established ones.
| I don't think it has anything to do with the amount of time
| since the question was asked.
| panki27 wrote:
| Not necessarily "new to StackExchange", but at least to the
| physics site.
| kylehotchkiss wrote:
| I think a lot of people here would agree that AI/LLMs got them
| off of stackexchange (not just stack overflow) and it's
| refreshing to not have to deal with the moderation's instant
| "did you google" / "duplicate question". These new contributors
| will learn and switch over to chat.com soon enough
| guerby wrote:
| "With inverter-based power storage, generation, and transmission,
| the grid can now react incredibly quickly. This is good when they
| do the right thing, but can be very bad when they do the wrong
| thing."
|
| I'm wondering if this will be like the 2016 South Australian
| blackout
|
| https://en.wikipedia.org/wiki/2016_South_Australian_blackout
|
| "AEMO identified software settings in the wind farms that
| prevented repeated restarts once voltage or frequency events
| occurred too often. "
|
| Grid operators are currently mostly against renewable and so they
| impose "blunt" disconnect rules on inverters behind renewable
| sources, and this comes to bite the grid when the proverbial shit
| hits the fan.
|
| May be in the end this will be a good thing and grid operators
| will start to treat inverters and renewable as a strength and
| modify grid regulations as needed.
| reaperducer wrote:
| _Grid operators are currently mostly against renewable_
|
| As someone who moves a lot, it's always curious to me that grid
| operators vary so widely on this.
|
| Some places (like where I am now), the grid operator hates
| renewables and especially rooftop solar.
|
| Other places, the grid operator will actually subsidize rooftop
| solar because it they say it reduces the amount of generation
| it has to do, thus saving money on infrastructure and
| maintenance.
|
| Of course, each location has wildly different climates, but the
| regional politics aren't that different, so I don't think it's
| about ideology.
| shadowgovt wrote:
| It depends heavily on their market incentives. If the local
| power company is also in charge of the wires, less load on
| the wires means less cost. In a market where distribution and
| generation are different operations, generation only cares
| about whether anyone's going to buy the electricity they want
| to put on the wire and you saying "No thanks, I'm full" is in
| direct competition to their interests (and existence as a
| firm).
| idiotsecant wrote:
| Huh? Transmission networks get directly financially
| rewarded for more power flowing in the form of wheeling
| charges. It's wild reading HN discussions of topics that I
| actually know about. It makes me wonder how much I can
| trust the discussions I _don 't_ know about.
| pjc50 wrote:
| This is very jurisdiction-dependent, isn't it? And
| different for nationalized operators like the UK?
| tekla wrote:
| I know things about airplanes. The discussions here about
| airplanes is laughable, below wikipedia level.
| shadowgovt wrote:
| Funny enough, the effect of inverters on the grid may be
| mitigated with a relatively simple solution: add a flywheel to
| the inverter-based connection farms to "fake" a turbine.
|
| The wind or solar farm drives the flywheel and if the grid-side
| power starts to fluctuate, it pulls on the flywheel before the
| inverters feel it. You lose some total efficiency in the
| electrical-to-mechanical-to-electrical conversion, but get
| enough flywheels and maybe you don't care (because they also
| act as a place to store peak energy production when demand is
| low).
| dainesy wrote:
| How Wind Turbines Generate Electricity
|
| 1. Mechanical to Electrical Energy Conversion * Wind Energy
| Capture: The wind pushes against the blades of the wind
| turbine, causing them to rotate. These blades are attached to
| a central hub, which turns a low-speed shaft. * Gearbox (in
| many turbines): This shaft is connected to a gearbox, which
| increases the rotation speed. The gearbox drives a high-speed
| shaft connected to the generator. * Generator: The high-speed
| shaft turns the rotor inside a generator. As the rotor spins
| inside a magnetic field, it induces a flow of electricity--
| typically alternating current (AC)--using electromagnetic
| induction.
|
| Some turbines use direct-drive generators (no gearbox),
| especially in offshore installations, which reduce
| maintenance.
|
| 2. Power Conditioning and Grid Integration * Variable Speed
| Generation: Wind speed varies, so the output frequency and
| voltage can fluctuate. Wind turbines typically use power
| electronics (converters and inverters) to stabilize the
| electricity before it's sent to the grid. * Inverter Role:
| Converts variable-frequency AC or DC from the generator into
| grid-compatible AC (usually 50 Hz or 60 Hz depending on the
| region).
|
| 3. Phase Angle and Synchronization
|
| What Is Phase Angle? * The phase angle represents the timing
| difference between the voltage waveform of the turbine's
| output and the grid's voltage waveform. * For a generator to
| supply power effectively, it must match the phase, frequency,
| and voltage of the grid. * If the phase angle is off, power
| cannot flow efficiently and may even cause instability or
| damage.
|
| Synchronization Process * Before a wind turbine connects to
| the grid, its inverter adjusts the output so that: *
| Frequency = Grid frequency (e.g., 60 Hz) * Voltage = Grid
| voltage * Phase angle = Aligned with grid phase * Once
| synchronized, the turbine can export power.
|
| 4. Ancillary Services Provided by Wind Turbines
|
| Ancillary services are support functions that maintain the
| stability and reliability of the power grid. Modern wind
| turbines, especially with advanced inverters and control
| systems, can provide several key services:
|
| A. Frequency Regulation * Wind turbines can rapidly adjust
| output to help balance supply and demand. * This is called
| primary frequency response, essential when there's a sudden
| change in load or generation.
|
| B. Reactive Power Support / Voltage Control * Inverters can
| produce or absorb reactive power, which helps maintain
| voltage levels on the grid. * This is important for power
| factor correction and avoiding voltage collapse.
|
| C. Inertia and Synthetic Inertia * Traditional turbines (like
| in coal or gas plants) provide rotational inertia, helping to
| resist sudden changes in frequency. * Wind turbines, being
| decoupled from the grid by power electronics, don't naturally
| provide inertia. * However, some advanced systems provide
| synthetic inertia by rapidly adjusting power output in
| response to frequency changes.
|
| D. Black Start Capability * Some wind turbines can assist in
| black start procedures (restarting the grid after a
| blackout), but this is still limited and evolving.
| dainesy wrote:
| Different set up but same physics apply. I was called out
| to a cold forming press which basically was hammering an
| enormous load onto billets of steel to form panels for the
| automotive industry.
|
| The problem on inspection: The drop press was producing
| inconsistent strikes, especially noticeable when working
| with thicker steel billets. The machine seemed to struggle
| during the initial drop phase, and there was an unusual
| amount of sparking observed near the motor's commutator.
| This problem was consistent with poor commutator
| maintenance and misalignment or excessive vary to the
| variable angle brush set up.
|
| Whilst the motor was spinning the commutator was cleaned,
| after shut down the brushes were replaced and adjustaded to
| the optimal position ensuring they're neither advanced nor
| retarded. By correctly adjusting the brush angle, it
| restored the proper phase relationship between the armature
| current and the stator's magnetic field. This adjustment
| improved torque production during the drop phase, reduced
| electrical arcing, and enhanced overall motor efficiency.
|
| In brushed DC motors, the brush angle determines the timing
| of current delivery to the armature windings. An advanced
| brush angle means that current is supplied earlier in the
| rotation cycle, which can increase torque at higher speeds
| but may cause excessive current draw and heating at lower
| speeds.
|
| Conversely, a retarded brush angle delays current delivery,
| potentially reducing torque and efficiency under load.
| idiotsecant wrote:
| Grid operators are, as a rule, not opposed to renewables at
| all. They are 'opposed' to resources that do not provide
| frequency support and are non-dispatchable. Renewables need
| storage to be well behaved. As soon as we start factoring that
| into the build at scale the problems go away. Generators want
| to ignore all the inconvenient physics of power transmission
| networks and just want $$$ for MW. The system doesn't work if
| enough people operate like that.
| guerby wrote:
| You're completely wrong about this.
|
| Inverters if told so can do frequency support better and
| cheaper than any other solutions.
|
| No other technology can react as fast as an inverter.
|
| See the Texas grid grid service market which is now
| completely dominated by GW of inverters.
|
| https://comptroller.texas.gov/economy/fiscal-
| notes/infrastru...
|
| "One solution is to connect inverters with "grid-forming"
| capabilities, which help mitigate this risk by limiting
| fluctuations outside of 60 Hz, increasing grid stability.
| Experts see utility-scale batteries as a prime opportunity to
| deploy grid-forming inverters to the grid, as grid-forming
| integration with batteries is cheaper and faster than
| building new transmission."
|
| "grid-forming" inverter is just software and parameters, your
| el-cheapo home solar inverter can do it too. It currently is
| prevented from doing so by ... grid operator regulations
| which ask it to disconnect at the first issue.
| metalman wrote:
| it also needs silicone carbide, which is the substance
| behind transformerless, inverter based grid power switching
|
| https://www.powerelectronicsnews.com/silicon-carbide-sic-
| ena...
| idiotsecant wrote:
| Let's talk about how you think inverters do frequency
| support without storage, which was the central point of my
| post.
| silon42 wrote:
| They could easily have some spare/unused solar capacity
| (say 10%) and use it when frequency drops.
| toast0 wrote:
| > "AEMO identified software settings in the wind farms that
| prevented repeated restarts once voltage or frequency events
| occurred too often. "
|
| > Grid operators are currently mostly against renewable and so
| they impose "blunt" disconnect rules on inverters behind
| renewable sources, and this comes to bite the grid when the
| proverbial shit hits the fan.
|
| As a distributed systems person, this seems like a
| coordination/communication problem. If a single node is having
| repeated events, it may likely be broken and staying offline
| could be a better choice. If multiple nodes are having repeated
| events, maybe it's better for them to stay connection and do
| their best.
| 6d6b73 wrote:
| It's a fake term, used by the government to hide the real cause -
| deteriorating magnetic field, that will flip in 15-25 years, but
| we will start seeing a lot of issues similar to that event more
| often.
| matkoniecz wrote:
| [citation needed]
| widea wrote:
| April 1 already?
| kazinator wrote:
| Accepted answer posits that this may be due to a mistranslation
| from Spanish, or someone's misunderstanding of an explanation, or
| both.
|
| In other words, the phenomenon is another "vegetative electron
| microscopy".
| jhayward wrote:
| That answer has 4 upvotes. A much more electrically literate
| answer above it, with 35 upvotes, explains in detail that it is
| a real thing.
| kazinator wrote:
| The accepted answer is not electrically illiterate in any
| way.
|
| The upvoted answer, while it may be correct, doesn't argue
| for the existence of the phenomenon called "induced
| atmospheric vibration".
|
| It may be that it's supposed to refer to corona discharge,
| which does make a sound ("atmospheric vibration"). But that
| sound is not the root cause of anything; it is just a side
| effect of no consequence.
|
| It is a plausible hypothesis that "induced atmospheric
| vibration" it's just someone's misunderstanding (possibly of
| an explanation similar to what's in that upvoted answer),
| with some misstranslation being a contributing factor.
|
| The two answers simply don't contradict each other.
| rasz wrote:
| Spanish grid operator (Red) preliminary Engineering Report seems
| to be blaming renewable generation (solar) for the initial drop
| followed by second drop 1.5 seconds later.
| perching_aix wrote:
| Where can one find the report? Couldn't find anything on their
| website or elsewhere. I was only able to find the following
| media briefing via Reuters [0]:
|
| > REE's System Operations Chief Eduardo Prieto told a news
| briefing the electricity system was hit by a dramatic power
| generation loss in southwestern Spain, that caused instability
| in the system that led to its disconnection from the French
| grid. He said it was quite possible that the affected
| generation was solar, but it was too early to say for sure.
|
| This doesn't quite read like them _blaming_ solar either. If
| anything, they 're painting it as one of the victims of the
| failure.
|
| [0] https://www.reuters.com/world/europe/spanish-grid-
| operators-...
| acyou wrote:
| I think they might have been referring to conductor gallop, power
| line sag, and subsequent fault. I read synchronisation failure as
| downed cable. With extreme temperature variations come extreme
| winds. Not sure if this was the case.
| whitehexagon wrote:
| Interestingly, the recent deadly floods were also blamed on a
| rare atmospheric event. Sadly, it seems official information
| during such events is just as rare.
|
| No power is unusual, but happens, but no mobile phones, no
| internet, no emergency broadcasts, SMS or otherwise, just
| complete silence for hours... and then you hear it might be
| multi-country wide. Pretty scary. You assume the worst, right?
|
| What was also scary to see was how little cash people have. The
| cash machines went down, queues formed, banks closed, POS
| terminals failed, and suddenly the smart-world we are building
| was looking very dumb.
|
| Imagine not being able to buy basic essentials like medicines,
| food and water. Hopefully more people will reject cards / digital
| money as a result of this crisis.
|
| But I also wonder what contribution the massive new solar farms
| and wind farms had on this crisis. That supply must be quite
| variable, and subject to rare atmospheric events such as
| clouds...
|
| Sorry to rant, it was a pretty upsetting experience.
| perching_aix wrote:
| This news cycle was pretty hilarious (and just as sad) to hunt
| through.
|
| From what I deciphered, the actual suggested cause was "aeolian
| vibrations" [0], which is one of the three forms of wind-induced
| conductor vibrations according to this [1] IEEE article. Also
| known as "flutter" according to Wikipedia [2]. (I'm not in EE so
| can't confirm nor debunk.)
|
| Connected to this, another seemingly made-up term that made the
| news cycle was "Ging-induced vibrations" (in Portuguese media).
| Now, I don't speak Portuguese, but all my efforts hunting down
| this mysterious Ging tremendously failed. However, when I plopped
| ging into translation models, I couldn't help but notice that
| "ginga" in Portuguese means "swing", as in cable swing. So I'm
| giving it pretty reasonable chances that "ging" (no
| capitalization) might be what "flutter" is in English, i.e. the
| industry slang for "aeolian vibrations" there. And then the rest
| was just a typical journo move, much in the way of "the hacker
| known as 4chan".
|
| In any case, it would have been cool if anyone actually _linked_
| to where said company made their statement, so that people could
| independently verify what was actually being said. From what I
| read, they have since explicitly debunked that they were
| inventing any new niche atmospheric effects. It 's incredibly
| disheartening that such basic bits of information can become this
| seriously distorted before going viral, even (especially?) in
| this day and age. Makes you wonder how trustworthy are the
| regular news, even biases nonwithstanding, that aren't so readily
| obvious to be bollocks.
|
| [0] https://www.youtube.com/watch?v=j-VzxRfPHjU
|
| [1] https://ieeexplore.ieee.org/document/4773888
|
| [2] https://en.wikipedia.org/wiki/Stockbridge_damper#Wind-
| induce...
| plorg wrote:
| I'm part of a listserve for power systems engineers (more from
| academia than from industry) and the consensus seems to be that
| a couple of trips in short succession caused wild swings in
| powerflows, resulting in a cascading failure - this is a pretty
| boring, if consequential, N-2 event, very similar to the 2005
| Northeast Blackout in the US.
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