What is a Tuned Mass Damper?

FAQ:
(1) What's that physics simulation software called?
Algodoo (it's free!).
(2) Your music is no good.
I didn't nail the mix on this video, but it is fixed on subsequent videos.
(3) I want to build my own. Where can I find plans?
This wasn't meant to be a "how-to" video, but I put some details about the model at this link: www.instructables.com/id/Tune...
In many of the world’s tallest skyscrapers, there’s a secret device protecting the building and the people inside from strong motion due to wind and earthquakes. Did you know you can tune a skyscraper just like a guitar? In this Practical Engineering video, we’re comparing theory to the real world for tuned mass dampers.
Luckily this tech is simple enough that we can model it right in the garage. As silly as this little experiment looks, it’s actually not that far off from what engineers do in the real world (maybe without the googly eyes). The design phase for just about every major building includes some physical scale model tests. This video shows that the tuned mass damper is a great example of elegance in engineering.
Thanks for watching, and let me know what you think!
Aluminum parts for the cart and damper are actobotics. The accelerometer I used is the ADXL345 breakout board from Sparkfun. I filtered the x-axis data with a low-pass filter, then sent it via serial port to my laptop. I just copy the data from the serial monitor window and import into Microsoft Excel for the figures. For the figure animations, I wrote a custom macro and used a screenshot program to capture them as video.
Watch this video and the entire Practical Engineering catalog ad-free on Nebula: go.nebula.tv/practical-engine...
I use all Patreon earnings to improve the quality (and quantity!) of videos: / practicalengineering
Website: practical.engineering
Music: Valesco - Cloud 9 ( • Valesco - Cloud 9 [Roy... )

[@PracticalEngineeringChannel]

Headphone users beware :) I went a bit overboard with the music on this video. It is fixed in all other videos. Sorry about that, and thanks for watching!

[@calebgerweck2163]

First video I've seen from your channel. Like the content but the bass was a bit much...wife and kids sleeping and all. Will check out some other videos though for sure.

[@AdrasHoriaGaming]

algodoo is the program

[@karmagames377]

*math alert comes up* Aw healllll nawww iz too early fo dis!

[@caghantuncer6081]

Such a great video.

[@neilarmstwrong6914]

Not sure what you are talking about, I actually enjoyed it a lot, its good sometimes to have a different vibe from those awful "techy' songs the other channels use.

[@tp7886]

That dubstep turned my walls into tuned mass dampers.

[@IanCaine4728]

Yeah, was not ready for the audio spikes this early AM.

[@User0000000000000004]

Even if it were quiet, it would still be unnecessary dubstep. Video fail.

[@RoboticEmotion]

Agreed. A different music choice would've been nice. This is unwatchable. Sorry.

[@projectAcy]

christ almighty what am i listening to lol

[@mikeletaurus4728]

Agreed. Annoying soundtrack.

[@Archgeek0]

"Usually without the googly eyes" ... implication: sometimes with the googly eyes

[@Suckeychicken]

engineers are an odd bunch

[@nicholascopsey4807]

Suckeychicken hey, stop describing me perfectly

[@jasonjamrs7413]

@@Suckeychicken we were still being in the stone Age about engineers googly eyes make everything look friendly that would be the best job in the defence force combat engineer

[@elijaha773]

You should see damper baby. It is closest to googly eyes you will see on a mass damper.

[@mikepoulin3020]

The googly eyes add extra dampening fools...!

[@hwd7171]

Taipei 101 just got hit by a 7.4 Earthquake, thank God for engineers like Grady, who save people's lives with their knowledge of engineering. God bless you Sir.

[@nicolapurvishomewood4686]

Great video, my 11 year old was so inspired she's basing her science fair project on it

[@edsweet2858]

*Give her the A+ of greatness*

[@hoolia4987]

Aww

[@ThatDrummerFrank]

That’s amazing!!!

[@carlosgeonzon7499]

Dont forget the Googling eyes

[@maxdecphoenix]

for anyone checking this comment, there is another short video that touches on the historical application of tuned-mass dampers. "What the Ancients Knew - Japan" kzbin.info/www/bejne/d2TEpWSBYritec0&t the first segment of the video shows and explains how the japanese used huge timber beams fastened onto the first floor to achieve this effect to keep the tall Pagoda towers intact during an earth tremor. p.s. (i'm certain this was common across all of Asia, and it probably wasn't even a Japanese invention, but they were the subject of the show and they used the principle. So deal with it. Don't nobody want to hear about 'the chinese invented this or that'.)

[@whynotanyting]

8:29, strange experiment. I didn't know engineers had to make sure their building were lamp proof.

[@PatrickHansen101]

Actually, that experiment proved that a full-scale version of the building, can withstand being impacted by the sun. :>

[@massimookissed1023]

It was to simulate the effects of an errant Godzilla.

[@kayeldee1]

Oh my god. That was sooo funny!

[@brianwyters2150]

K.DP. Ross kzbin.info/www/bejne/qnvTk4mXqa93asU

[@insolentish4529]

Bush did it

[@SuperPickle15]

I wish real skyscrappers had googly eyes :(

[@ZHud3]

So do engineers....

[@Bobsikus]

I am interested, how much those googly eyes influenced the measure at this scale :D

[@TheRandomshit33]

agreed

[@snowboyyuhui]

many of them do

[@curlyfryactual]

Eric Miret video uses m/s²...

[@ScarletKnightmare]

I'm a high rise consulting surveyor in NYC and get to watch building movement every day through my instruments. Before the TMD is installed, and while the concrete pumps are running, these towers absolutely rock and roll to the extent of nausea. I have some videos taken through the scope of my auto level which really show it clearly. I can upload if anyone is interested. Thanks for the great video!

[@alexandrezani]

Did you ever upload such videos?

[@Skank_and_Gutterboy]

I'd like to see that, that's worthy education.

[@ScarletKnightmare]

@@alexandrezani Uploaded! 👍🏼

[@ScarletKnightmare]

@@Skank_and_Gutterboy Done. I can upload more as I dig them out

[@Skank_and_Gutterboy]

@@ScarletKnightmare I got to see the one in Taipei 101, really cool!

[@traceyseier329]

I can't believe this was so long ago! Five years ago, I found this video for my kids to watch, and my little engineer LOVED it. We started watching your channel all the time. My kid has grown up with you. He's 11 now and he can't imagine growing up to be anything but an engineer. He loves all your stuff, but watching this video is a trip down memory lane. Keep on making videos and writing books. You are such a good teacher.

[@bubba_cypress]

Aww that's so wholesome! Best of luck to him🫡

[@garrylearmonth9313]

Wow what an awesome comment, maybe he will work on a tuned damper system in the real world and send some pics of it back, wouldn't that be cool.

[@ScramblerUSA]

2:22 - "... for our entire lives Wednesdays come after Thursday..." - WOW! You definitely live an unusual life!

[@GoldenGrenadier]

Alexander Khritonenkov it technically does if the next week counts.

[@thugasaurusrex6004]

Alexander Khritonenkov lol I thought i heard that too xD

[@omak7084]

in defense, wednesday the 20th of december came after thursday the 14th :)

[@bertjesklotepino]

thanks Einstein. My guess is that Golden Grenadier actually said the same thing................. But always nice to have an example for those who can not use their own imagination >;)

[@pokemonmaster1908]

yeep

[@michaelschmidt9458]

2:20 "Wednesday comes after Thursday"

[@neurofiedyamato8763]

Completely missed that. Hilarious

[@rachaelwang6155]

It sure does

[@joshuasutton1395]

I learned that thanks to this cool video!

[@jaysea5939]

Technically correct

[@benadryl9192]

Yeah, u got a problem with that?

[@RascaldeesV2]

"Buildings are no use if no one wants to be inside them" Most people: "Makes sense." Me: "... prisons..."

[@sarahzengl1121]

Well you wouldn't want to build a wobbly prison either

[@gabrielwhite3890]

well what about the guards

[@Popupkiller]

@@sarahzengl1121 Or maybe you do. Extra incentive to not get locked up.

[@robertjarman3703]

North Korea's hotel.

[@seanconnell622]

A fair few prisoners want to be in prison ....

[@Kumquat_Lord]

I'm just annoyed you didn't show the waveform when the lamp fell over, that would have been fun to see

[@Iconoclasher]

That would be handy for when a giant lamp falls on a skyscraper. 😅

[@robduquette8537]

He may not have been recording it at that time

[@superglue46]

@@Iconoclasher Imagine the size of that lamp!

[@SuperPhunThyme9]

ME TOO!

[@SuperPhunThyme9]

@@robduquette8537 ...Yeah ill bet he want recording... because that would have been interesting indeed

[@MouseHandStrong]

Loved when the tuned mass damper works extra hard to counteract the light that fell on it lol

[@illusion4131]

As a young parent who obtained my education through the GED and as someone who has a very hard time wanting to learn, I gotta say you make learning fun, interesting, and I appreciate everything you do on this channel.

[@satan.is.my.copilot]

GED = Good Enough Diploma

[@renatotobar8012]

3:40 "Looks like it came straight off the island of mistiff mascots." Oh, you mean Japan.

[@ThePaintballgun]

Subscribed because of your sweet montage.

[@GeneralThargor]

+Don't Even Bother it was the googly eyes that got me, the sweet montage was a bonus!

[@ThePaintballgun]

General Disaster Ayyye

[@johnlbales2773]

Don't Even Bother Yes, but he said Wednesdays come after Thursdays.

[@ThePaintballgun]

John L Bales what?

[@davidscott5903]

John L Bales good catch at 2:23

[@Educ8s]

Great video. Thanks for sharing. As a former teacher I can clearly see that you have the gift of good teaching. You know how to attract and keep the attention of the viewer. You can also teach difficult to understand topics with ease due to your profieciency on the subject and a natural gift. We are very lucky that with the help of modern technology we can all learn from each other and channels like yours is great example. Please keep it up!

[@PracticalEngineeringChannel]

+educ8s.tv This is really kind. Thank you!

[@the.Gremlin]

I still pull up these videos from years ago to show people the visuals and great information you have compiled creating these. It is fun to open someone's eyes to a subject or topic they didn't even know existed yet.

[@khaleedairil1975]

back to basics. some lecturers missed this basic

[@pithicus52]

I used to live on the top floor of a 10 story apartment building. In a strong wind it noticeably swayed back and forth in a way that I learned to not be concerned about. One day I felt a different motion. I looked out the window but didn't see any evidence of strong wind. I make a note of the time, and later that day a news program said that there had been an earthquake centered a couple hundred miles away at the time that I felt the strange motion. Different source, different motion.

[@paulmast]

Video: "If you remember from your Physics classes..." Me: "What Physics classes? Does he mean this video?"

[@oneofthenine6647]

I learned about Pendulums in school, but never seen their value more then a curiosity. Now it makes more sense as a practical sense. Thanks for the small piece of information.

[@MacIn173]

Well, what about demonstration/proof of earth rotation?

[@christianschwalbach7561]

MacIn173 the certainly become useful in many measurement applications

[@catocall7323]

Clocks!

[@User0000000000000004]

Didn't learn about capitalization though.

[@ennui9745]

​@@User0000000000000004 you didn't learn about decency either so it evens out.

[@appliancetraining]

My customers would love a mass dampener in their front load washer! There was a joint model between Samsung and Maytag, which used 4 springs and a steel solid mass. They mounted it on the very top. I don’t know why, more time wasn’t spent on design. The current design, is dampeners built into the front tub ring. Either thick fluid, which is why on some units sound like they still have water in them, or steel balls moving in opposing force. Front load washers have taken a beating cause of this issue. Thanks for the demo!

[@anotherwingover]

I cant emphasize enough how wonderfully this corresponds to the theory: 1) The bump of the cart hitting the wood excites the tower in "all" frequencies. Including the resonant frequency where we can see the tower shaking. 2) With a tuned mass damper and at resonance frequency (and above), the mass damper swings in reverse to the structures movement. I think this model is great :)

[@thedrunkenpilot]

Catherine ζ Jones

[@touzoutmohamedamine3473]

Great way to remember the damping ratio

[@brainmind4070]

He had it coming.

[@42lookc]

nyuk nyuk nyuk

[@seungmin282]

It would have been cool to see you adjust the tightness of the screws and the frequency of the pendulum to find the ideal dampening ratio.

[@joshuajudas2414]

Fact: Putting googly eyes on ANYTHING helps with depression.

[@illegalamishmen]

It also alleviates fear of plants, as proven by Christopher Walken.

[@thesoupin8or673]

I watched this video a long time ago, thought it was cool, and forgot about it. Now I'm a mechanical engineering student taking a vibrations class. I've just finished watching this video again, and this was an excellent, concise summary of material we just finished learning. Amazing! Excellent work

[@theomnipresent1]

2:23 I don't know about you, but I always thought Wednesday came BEFORE Thursday!

[@esreverniytilaer3510]

Yeah, only next week's Wednesday.

[@DanielRenardAnimation]

_"Wednesday comes before Thursday... or... DOES it? VSAUCE, Michael here!"_

[@SteveJones172pilot]

This is only true for weeks with only one Wednesday..

[@7Ghos]

I had to rewind it because I thought I misheard

[@FHL-Devils]

kzbin.info/www/bejne/oZe5pJmFiMd9j5I

[@mebezaccraft]

I love how there is a channel called practical engineering and then a channel called real engineering. THERES PRACTICAL ENGINEERING THEN THERE IS *REAL* ENGINEERING

[@HentaiNat]

why do I always see you?

[@fearstreak7462]

don't forget Primitive Technology (sadly without the sexy voice over Kappa)

[@davewitter6565]

I just discovered you "Practical Engineering" channel. I have been to Taipei 101 and seen the Mass Damper on display. Civilization and Engineering stand on the shoulders of giants, each generation building on the knowledge of the past. Quality job on your explanation, well done.

[@edwardnorton5693]

Some of the piston aircraft engines that are made by Lycoming and Continental have dynamic dampers attached to the crankshaft. During college in 1990, I studied to get my Airframe & Powerplant maintenance certificate. One of my instructors told the class, that if you ever operate one of these type of engines, to never shut the engine off with the fuel mixture while it is producing power. A few years later I found myself flying such an airplane with a dynamic damper on the crankshaft. During aircraft training at Flight Safety in 1992, I mentioned to the flight instructor what I was told at school about not using the mixture to shut off the engines while producing power. The instructor told me that is the way it has always been done and that it had been done countless times without any problem. Furthermore, their was no mention of that issue in the aircraft flight manual. A few months later, the engines were overhauled. After the engine were put back on the airplane, the right engine was completely destroyed in flight when the crankshaft broke. I made phone calls to the maintenance shop, overhaul shop, and the FAA to inquire about why the engine failed. The FAA told me that the dynamic dampers were not overhauled properly. Many years later in 2000, I came across a flight manual for a Piper Seneca. That was the first flight manual that I have ever seen that backed up my maintenance instructor about the dynamic dampers and to not shut down the engine with the fuel mixture during flight training. On another note, my 1999 Toyota 4-Runner also had dynamic dampers on its 4x4 transmission. That transmission also had a suspicious requirement. You could engage the 4 wheel drive mode, at speeds up to 62 mph, yet disengage at any speed. My 2017 Toyota Tacoma 4x4 did not have a dynamic damper, but still had the same suspicious speed limitations for using 4 wheel drive. I was told that the 4-Runner, Highlander, and Tacoma all use the same engine. My 1999 4-Runner transmission, with the damper on it, had many expensive problems that were traced back to its computer.

[@SpecificLove7]

Thanks for explaining this so well.

[@EdsboOfficial]

A verified KZbinr with no comments but I’m the first comment here so change that to 1 comment

[@ibandribew]

I bet the googly eyes also act as dampers

[@tomwhipp3245]

thankfully they are a controlled variable, as they are present in both scenarios.

[@UnluckyKnave]

I want more googly eyed dampers on my buildings!

[@gorillaau]

If the googly eye were the size of the pendulum (3.7 inches I think it way) and had some weight in them, then yeah. That might just work.

[@louf7178]

gorillaau But didn't it show that w/o dampening it only transfers the KE?

[@Dan-pf1jf]

It is possible, just adjust the weight and it might just work

[@cayrick]

Love the way you enhance your discussions with video and examples. Well done Grady!

[@davidm8371]

It's always interesting going back in time on a familiar KZbin channel to see what they were like when they were still figuring out their style.

[@jamezco]

just came back from Taipei 101 and wanted to know more about the dampers. great explanation. love it!

[@pewpewdragon4483]

8:30 XD I wasn't prepared for that.. "Of course a tuned mass damper doesn't completely eliminate movement" *As a giant mass smashes into the building* "But we saw that it can certainly make a difference"

[@w00d_dude36]

After having watched a few other videos of you I was suprised to hear this was your first one. The quality of the video is incredibly high for a first try on KZbin. I‘m honestly impressed. Well, of course your animations and overall visualisation improved, but still: amazing video!

[@seannov112995]

4 years later and I'm brought to this video in my last week of classes in my senior year of my BS for mechanical engineering. Thank you for making these videos all through the years and for inspiring kids like me to study engineering.

[@AppliedScience]

Great video! I really like your presentation style.

[@PracticalEngineeringChannel]

+Applied Science Thanks so much Ben.

[@hatman4818]

+Practical Engineering Are you guys, like, a group or something? Because it'd be pretty cool if there were channels like this in every topic.

[@PracticalEngineeringChannel]

No, but looking at our two logos together, I can see why you'd think that, haha. It looks like I may have taken some inspiration from Ben!

[@BibhuPrasadNayak5308]

+Applied Science you both are ausm

[@piranha031091]

Funny seeing you here! Your channel's awesome too, too bad you haven't been very active in the last few months...

[@monophoto1]

Excellent video! This is the kind of video what we need to expose high school students to - to show them that careers in engineering offer opportunities to work on fascinating problems that make a difference in people's lives.

[@PracticalEngineeringChannel]

+Louie Powell Thank you Louie

[@xionix4]

"For our entire lives, Wednesdays come after Thursday..."

[@MiauTheWorld]

I sucked so hard in physics in high school, specially when it involved maths, but I still like the theorical concepts behind it. You managed to make such an interesting video, and pretty straightforward so even someone like me could understand it. The googly eyes were the best part, obviously. Really loved it, subscribing to your channel

[@eddchambers]

You are a legend! Keep up the good work m8! I’m a structural engineer of 6 years and still find your videos super helpful and informative

[@dr.skulhamr3220]

LOL ... you sound so much like a post-doc in the way you couch your phrases. Good job man!

[@DmitriNesterov]

Это гениальная философская находка! Каждый эксперимент должен иметь свои глаза, чтобы наблюдать за наблюдателем!❤😊

[@josephribinsky7470]

I live in a house on the Jersey shore (Long Beach Island) It is a two story house on wooden pilings. (so it is really three stories) Every good storm we get rocked to sleep as the house sways in the wind. It is kind of soothing to us but guests are often surprised the first time.

[@TheRealFOSFOR]

The Taipei Tower looks like a stack of Chinese take away food boxes.

[@TechnoElectroFreak]

I am never going to unsee this lol

[@sil8127]

You mean oriental takeaway boxes are based on ancient oriental architecture?

[@TheRealFOSFOR]

Simon Marr Or maybe it's the other way around =O Who knows?

[@cwildeman]

The architects were going for a bamboo inspired look. But yeah, you're right.

[@emreevo8]

It looks better than most skyscrapers.

[@AxcelleratorT]

WOW Great video! I like these fundamental physics/engineering demos! This one just earned my subscription (and a thumbs up)

[@ronakshah13]

Mark Andrews can you advise the other ones? Would love the list of it...

[@stevenbaxter8657]

Your presentation and clarity shows that there are people doing things right for me and other people because they enjoy the challenge of getting things right thanks.

[@williamjones7163]

I live in Phoenix, Arizona and we have a 13 story countu court building. It is legendary for the occupants on the top floors to get a little sea sick during high winds due to the building swaying. I never had to experience the motion because I never worked above the third floor.

[@qwertyword]

I just found this channel from The Hydraulic Press channel. You produce excellent videos!!

[@PracticalEngineeringChannel]

Thanks!

[@coolpiehead1234]

Me too! I love this guy, great videos man:) I've watched all of them!

[@rnk482]

Engineering4life I love hydraulic press channel and beyond the press!

[@Jobobn1998]

Gotta love that you put in the lighting gaff. Keeping it a bit real for all of us watching.

[@ab7dasker]

one of the best educational/science videos I've ever seen. Accessible but gets into the math a bit. Extremely informative and well presented!

[@PentaSquares]

I went to an "architecture" class and the tuner mass damper was one of the first things I learned about. (It was some lego-ish looking stuff. It was basically legos, but specifically for architects and engineers.)

[@structuralanalysis6885]

Speaking as someone who loves structural dynamics, this is a gem. I hope to design one of these someday. Thank you for your effort.

[@heinrichthurston6961]

I absolutely clicked for the googly eyes. But I also like physics.

[@mitchahbw]

If i designed a building it would have googly eyes

[@Enchisedmy]

hah, me too

[@JonatasAdoM]

Imagine a tsunami barrier with googly eyes

[@johnwiemeyer1687]

Nice work Grady. You ability to make simple the complicated is truly amazing. Great application of an Arduino board and an MEMS accelerometer. Platforms such as Arduino, Beaglebone, etc have certainly made it much easier (and less expensive) to apply the technology. Keep the videos coming. I would like to see one on building science and the application of thermodynamics to size heating and cooling systems.

[@hightechredneck8587]

Fantastic video. I actually figured out a while ago that the oscillation in buildings is the reason I had a fear of heights and couldn't go near the edge of buildings. After being around buildings with a damper, height doesn't bother me anymore. Also as a compliance guy who works with engineers I find your videos fantastic.

[@barcadoubletreblesixtuple4020]

8:30 The conclusion is, no building can withstand massive timber fall eventhough they have mass damper installed...

[@GarrettPetersen]

If I could only save one KZbin channel to help rebuild civilization after an apocalypse, it would be this one.

[@unsane7188]

I know I’m 5 years late but what a great video. Thank you for clearing this up so informatively. I was watching a show about street food in Taipei and caught a glimpse of this magnificent monster but had no clue as to what I was looking at. It’s pretty awesome. Great job

[@cobrajet8866]

You are the best on the internet GRADY. As an engineer, I really enjoy your channel. Keep up the good work - you never know how many engineers to be that you are creating. This makes the world a better place.

[@flignar]

That was a fantastic and well written narrative.

[@xhotweb]

It was funny too :D

[@HarukiYamamoto]

"It may not be enough to affect the building's structure, but it may be enough to cause a 1%-ter on the top floor to loose his cavier." Very strong reason.

[@seriouscat2231]

Those are spelled 'lose' and 'caviar'.

[@emperorjj1]

First Practical Engineering video?!? I'm glad this came up as a suggestion. Love this channel. Can't wait to get the book

[@pboston6RR]

OK ….. I’m addicted to your videos. I love to find out how things work, even things that don’t impinge on my life.

[@watson494]

Excellent video, your channel is surely the best engineering channel on youtube! I hope you keep doing more videos. Cheers

[@PracticalEngineeringChannel]

Thanks!

[@walkingweapon]

Your production quality is incredible!

[@3m0joo69]

I'm mechanical engineer and I'm studying mechanical vibrations and this video helped me in my project

[@connorbell5099]

Sincerely enjoyed the presentation. I have been teaching about issues caused by tectonic plate movement and spurred off into engineering and construction advancements in earthquake zones. This video was a great help in explaining how the TMD work. Thank you.

[@esfitnesspro2455]

Quickly became one of my favorite KZbin channels.

[@TheB1M]

Awesome video!!

[@BowTie8Bit]

Excellent video but I am so glad his more contemporary videos don't have that really loud music in them. His new stuff is top-notch.

[@jonknodel5640]

Fascinating topic. I just found your channel and I'm loving it. Thank you so much for all the effort you put into these videos! 👍

[@luclachapelle8065]

So I'm currently finishing up sophomore year of highschool but I just found you channel and it's very interesting! I've wanted to be a mechanical engineer ever sense I can remember and it's cool to learn about some things I've never heard about on your channel.

[@MichaelPayPlus]

2:22 for my entire life, Wednesdays do not come after Thursdays...

[@PracticalEngineeringChannel]

#LIVELIFEBACKWARDS

[@MichaelPayPlus]

:P haha it made me question my whole existence for a second though... haha

[@benjylamb]

They do, just simply 6 days afterwards. Both Thursdays and Wednesdays come after each other, no fallacy here.

[@shaunbrowne5139]

Grady, I am just a layman and have zero physics knowledge. However, I am completely drawn to your enthusiastic presentations. Many thanks for these andmore power to you.

[@edwinmerino2147]

Killer explanation. The time and effort in making these videos truly show.

[@briansmobile1]

I love your channel! I subscribed. Your production quality is fantastic your content is relevant and well presented. And your appearance is swell! (you asked)

[@PracticalEngineeringChannel]

+briansmobile1 haha thanks!

[@mightybrighty73]

briansmobile1 I love your channel

[@evmanbutts]

Tuned Mass Damper is my favorite ELP song.

[@simplyredd8993]

All of your videos are so comforting and educational, plus interesting. I'm glad I discovered your channel to get away from all the silly, sick, disgusting evil and dark mayhem that's plaguing the whole world right now. Thanks and keep these videos coming.

Great video! I'm civil engineering student and I'm working on my thesis, it is about a seismic table. One of the experiments that I want to show is how the mass damper works. (Sorry for my English, I'm a Spanish native).

[@snipeyspidey24]

Wednesdays definitely come BEFORE Thursdays

[@garyha2650]

Technically true that Wednesdays do come after Thursdays, until the end.

[@hellterminator]

But Wednesdays do come after Thursdays. 6 days after to be precise.

[@imdrunken]

just found this channel. great stuff keep it up

[@tinyentropy]

Your videos are so fantastic. Calm and clear.

[@billahlstrom2040]

I had never heard of such a thing before watching this video. I love the subject of physics so this was really interesting. You did a very good job with the visuals. Thanks for posting this video.

[@drubradley8821]

those "GOOGLY EYES" must be the scientific kind..... lol. Well, you sold me on this video, I hit the subscribe button. I have been designing & building things for as long as I can remember for about 37 years... and one thing that never clicked in my head was your (triangle chart) of the inexpensive, effective, innovative. I am at a constant battle with myself. I go through the whole design game of crunching numbers to the best of my ability, to insure that I know where the minimum and an approximate maximum threshold would be or needs to be. My battle comes into play out of fear of something not being strong enough, lite enough, heavy enough, etc., of which results in my over designing and over building something, when certain factors are not an issue. Quite often, over the years, folks will mention to me, after seeing a project, they'll say, "WOW Drew... it is not going on the space shuttle", or "you building that to go to war"... Although I laugh with them, it actually does bug me, that I over design & build everything. My point that I think I'm trying to get to, is; until I seen your triangle chart, I never had anything to go off of, as per, balance. All three points can be measured, and graphed, to aid in forming a balance of the minimum and maximum tolerances. The shocking part of this triangle chart, is that it is so rudely simple, like a slap in my face, as I question myself, "how did I never see this", even though I was already doing this. Some how, seeing this chart, lets me see these variants as a starting or stopping point. Thank you.

[@PracticalEngineeringChannel]

Thanks Dru. Really glad you liked the video!

[@jackvonfeld1178]

9:36. “A one percent-er on the top floor to lose his caviar... Hilarious! I love it.

[@svenswwis436]

Grady , your videos are always impressive, interesting and I learn every time I watch one. thank you!

[@mohammadzgoul90]

One of the best videos I ever seen really. I tired to simulate something very close to it in PTC Creo and I got close results. Thanks for the amazing video :)

[@tuckersmith6860]

Turn down the edm bub

[@savagesalvage9449]

Logan?

[@jasong4460]

Souljah Boy, crank that shit

[@calvinpojar6389]

Gonna have to disagree. Bangerz and engineering go hand in hand

[@User0000000000000004]

What's with all this annoying science talk in my dubstep?

[@MacIn173]

It is interesting, what would happened, if we added not one, but couple of pendulums. Like second one, tuned differently to absorb "the tail" of swinging sequence more efficiently.

[@SuperPhunThyme9]

Yeah like a secondary, lighter weight, less dampened pendulum ....and make it upside down-on top of the first! ...with a hot dog mascot

[@CesarandtheClew]

Research for "TUG". This was really informative to someone who knows very little about engineering, and fun too. Glad I found this page.

[@giusepperesponte8077]

This is my new favorite video of yours. Such an interesting and simple solution.

[@bibasik7]

8:22 WHAT? I don't want to be an engineer anymore.

[@LZEGION]

Hey, I'd love to see a video about the engineering of a simple bicycle wheel!

[@_lucid_one]

I'm not an engineer or anything of the sort but love the videos, content and presentation - so glad I found your channel!

[@YashvardhanVerma]

Great explainer! I was just talking about Taipei 101 to my high school students, but didn't understand the whole mechanism. This cleared it quite nicely