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!
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.
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.
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.
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" th-cam.com/video/A3at1K-SzCk/w-d-xo.html&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'.)
@@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
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!
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!
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.
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.
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
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 >;)
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.
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.
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.
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!
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 :)
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.
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.
There are tuned mass dampers on a lot of high voltage transmission lines to keep the cables from galloping. They look like little paper clips on the lines close to the tower
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
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
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.
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.
4 ปีที่แล้ว +2
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).
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
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.
I am an engineer that was stunned by the effectiveness of a TMD on a practical problem we had in a power plant. We had 4 X 1,4 MW column pumps for the condenser cooling. They where about 20 ft high. We had vibration problems with some of them because the pumps and the motors where not balance together properly at the manufacturing plant. We try to put stiffeners, balancing weight at the coupling...nothing worked. Then we hired this guy that came and screw a flat bar on the top of the motor with a small steel mass that it could slide up and down and set in place with a couple of set screws. This set up was like an antenna on top of the pump. Then he slide the mass to tune it and the vibration on those big pumps stops completely. I was amazed!
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)
I am no engineer, just a shade tree gyroplane designer wannabe. This vid has been a great help to me understanding this phenomenon. Thanks for taking the time to produce an excellent presentation. Greetings from Australia.
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.
"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.
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"
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.
Bless you for taking the time to create these amazing videos! I am 40yo and have financial training and find your posts inspiring. Going to get my six year old to start watching. Keep going!!
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.
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.
Yes. E=1/2 mv^2, no matter how you slice it. Then comes the economic analysis. If the system costs $500,000 to design and install and $1,000 annually to maintain, and it generates $4,000 a year in electricity, you'll probably opt out.
Another thing to remember is that generating electricity from movement will dampen the movement of the object, which might make it less effective at its primary task.
What if... What if you put several TMDs in parallel, having them each hang from the same roof? What if you put them in series, dampening a dampener dampening a dampener dampening a dampener....
To your first question--- you get the same effect. The positive result of the damper is the horizontal component of the force vector at each level, and you only get one net vector per level regardless of the number sources. To your second question-- similar to the first response: you only get the benefit from the point of attachement of the pendulum to the diaphragm. Everything that happens below there will amount to one net pendulum/damper combo as far as the building can tell. And if the net period is off as a result of your series, you accomplished nothing.
@@HollywoodF1 Actually no, it would be much worse than that. Having one pendulum attached to another is the classic example of a chaotic system. If you tried to use such a setup as a TMD, you would _usually_ get a smaller effect (as the lower TMD would dampen the upper TMD, meaning less dampening action for the upper TMD to apply to the building.) But sometimes it would damp much better than expected.. and every once in a while, you would end up with the system swinging wildly out of control and potentially even having a negative dampening affect (albeit only for short intervals.) Chaotic motion can be quite the mess.
That test was a good simple example. In the real world couldn't they incorporate an electronic device to vary the drag on damper as to transfer more energy to it?
@@vincentrobinette1507 There are such systems in use, but there's a very real danger that a failure in these systems could lower the damper's effectiveness to what could be catastrophic levels. Simplest is best here only because it has the fewest possible failure points.
@@P_RO_ That's why I would use such simple systems. A copper or aluminum disc and permanent magnets would be quite reliable. So would simple passive hydraulic shock absorbers, not unlike you find in a car or truck. I agree: Forget the electronics! During a seismic event, you can't count on electrical systems of any kind.
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.)
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!
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.
algodoo is the program
*math alert comes up*
Aw healllll nawww iz too early fo dis!
Such a great video.
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.
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.
That dubstep turned my walls into tuned mass dampers.
Yeah, was not ready for the audio spikes this early AM.
Even if it were quiet, it would still be unnecessary dubstep. Video fail.
Agreed. A different music choice would've been nice. This is unwatchable. Sorry.
christ almighty what am i listening to lol
Agreed. Annoying soundtrack.
Great video, my 11 year old was so inspired she's basing her science fair project on it
*Give her the A+ of greatness*
Aww
That’s amazing!!!
Dont forget the Googling eyes
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" th-cam.com/video/A3at1K-SzCk/w-d-xo.html&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'.)
"Usually without the googly eyes" ... implication: sometimes with the googly eyes
engineers are an odd bunch
Suckeychicken hey, stop describing me perfectly
@@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
You should see damper baby. It is closest to googly eyes you will see on a mass damper.
The googly eyes add extra dampening fools...!
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!
Did you ever upload such videos?
I'd like to see that, that's worthy education.
@@alexandrezani Uploaded! 👍🏼
@@Skank_and_Gutterboy Done. I can upload more as I dig them out
@@ScarletKnightmare
I got to see the one in Taipei 101, really cool!
8:29, strange experiment. I didn't know engineers had to make sure their building were lamp proof.
Actually, that experiment proved that a full-scale version of the building, can withstand being impacted by the sun.
:>
It was to simulate the effects of an errant Godzilla.
Oh my god. That was sooo funny!
K.DP. Ross th-cam.com/video/tJpbVatJD4c/w-d-xo.html
Bush did it
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!
+educ8s.tv This is really kind. Thank you!
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.
Aww that's so wholesome! Best of luck to him🫡
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.
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.
GED = Good Enough Diploma
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
Loved when the tuned mass damper works extra hard to counteract the light that fell on it lol
2:22 - "... for our entire lives Wednesdays come after Thursday..." - WOW! You definitely live an unusual life!
Alexander Khritonenkov it technically does if the next week counts.
Alexander Khritonenkov lol I thought i heard that too xD
in defense, wednesday the 20th of december came after thursday the 14th :)
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 >;)
yeep
I wish real skyscrappers had googly eyes :(
So do engineers....
I am interested, how much those googly eyes influenced the measure at this scale :D
agreed
many of them do
Eric Miret video uses m/s²...
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.
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.
back to basics. some lecturers missed this basic
Thanks for explaining this so well.
A verified TH-camr with no comments but I’m the first comment here so change that to 1 comment
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.
Well, what about demonstration/proof of earth rotation?
MacIn173 the certainly become useful in many measurement applications
Clocks!
Didn't learn about capitalization though.
@@User0000000000000004 you didn't learn about decency either so it evens out.
If I could only save one TH-cam channel to help rebuild civilization after an apocalypse, it would be this one.
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!
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.
Great video! I really like your presentation style.
+Applied Science Thanks so much Ben.
+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.
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!
+Applied Science you both are ausm
Funny seeing you here! Your channel's awesome too, too bad you haven't been very active in the last few months...
I'm just annoyed you didn't show the waveform when the lamp fell over, that would have been fun to see
That would be handy for when a giant lamp falls on a skyscraper. 😅
He may not have been recording it at that time
@@Iconoclasher Imagine the size of that lamp!
ME TOO!
@@robduquette8537 ...Yeah ill bet he want recording... because that would have been interesting indeed
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 :)
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.
Subscribed because of your sweet montage.
+Don't Even Bother it was the googly eyes that got me, the sweet montage was a bonus!
General Disaster Ayyye
Don't Even Bother Yes, but he said Wednesdays come after Thursdays.
John L Bales what?
John L Bales good catch at 2:23
2:20 "Wednesday comes after Thursday"
Completely missed that. Hilarious
It sure does
I learned that thanks to this cool video!
Technically correct
Yeah, u got a problem with that?
Awesome video!!
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.
There are tuned mass dampers on a lot of high voltage transmission lines to keep the cables from galloping. They look like little paper clips on the lines close to the tower
2:23 I don't know about you, but I always thought Wednesday came BEFORE Thursday!
Yeah, only next week's Wednesday.
_"Wednesday comes before Thursday... or... DOES it? VSAUCE, Michael here!"_
This is only true for weeks with only one Wednesday..
I had to rewind it because I thought I misheard
th-cam.com/video/kfVsfOSbJY0/w-d-xo.html
just came back from Taipei 101 and wanted to know more about the dampers. great explanation. love it!
Speaking as someone who loves structural dynamics, this is a gem. I hope to design one of these someday. Thank you for your effort.
"Buildings are no use if no one wants to be inside them"
Most people: "Makes sense."
Me: "... prisons..."
Well you wouldn't want to build a wobbly prison either
well what about the guards
@@sarahzengl1121 Or maybe you do. Extra incentive to not get locked up.
North Korea's hotel.
A fair few prisoners want to be in prison ....
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
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
why do I always see you?
don't forget Primitive Technology (sadly without the sexy voice over Kappa)
Catherine ζ Jones
Great way to remember the damping ratio
He had it coming.
nyuk nyuk nyuk
Video: "If you remember from your Physics classes..."
Me: "What Physics classes? Does he mean this video?"
one of the best educational/science videos I've ever seen. Accessible but gets into the math a bit. Extremely informative and well presented!
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.
I just found this channel from The Hydraulic Press channel. You produce excellent videos!!
Thanks!
Me too! I love this guy, great videos man:) I've watched all of them!
Engineering4life I love hydraulic press channel and beyond the press!
That was a fantastic and well written narrative.
It was funny too :D
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.
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).
It's always interesting going back in time on a familiar TH-cam channel to see what they were like when they were still figuring out their style.
8:30 The conclusion is, no building can withstand massive timber fall eventhough they have mass damper installed...
I bet the googly eyes also act as dampers
thankfully they are a controlled variable, as they are present in both scenarios.
I want more googly eyed dampers on my buildings!
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.
gorillaau But didn't it show that w/o dampening it only transfers the KE?
Petition to put giant googly eyes on every building.
The Taipei Tower looks like a stack of Chinese take away food boxes.
I am never going to unsee this lol
You mean oriental takeaway boxes are based on ancient oriental architecture?
Simon Marr Or maybe it's the other way around =O Who knows?
The architects were going for a bamboo inspired look. But yeah, you're right.
It looks better than most skyscrapers.
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
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.
"For our entire lives, Wednesdays come after Thursday..."
LOL ... you sound so much like a post-doc in the way you couch your phrases. Good job man!
WOW Great video! I like these fundamental physics/engineering demos! This one just earned my subscription (and a thumbs up)
Mark Andrews can you advise the other ones? Would love the list of it...
I am an engineer that was stunned by the effectiveness of a TMD on a practical problem we had in a power plant. We had 4 X 1,4 MW column pumps for the condenser cooling. They where about 20 ft high. We had vibration problems with some of them because the pumps and the motors where not balance together properly at the manufacturing plant. We try to put stiffeners, balancing weight at the coupling...nothing worked. Then we hired this guy that came and screw a flat bar on the top of the motor with a small steel mass that it could slide up and down and set in place with a couple of set screws. This set up was like an antenna on top of the pump. Then he slide the mass to tune it and the vibration on those big pumps stops completely. I was amazed!
OK ….. I’m addicted to your videos. I love to find out how things work, even things that don’t impinge on my life.
Your production quality is incredible!
Quickly became one of my favorite TH-cam channels.
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)
+briansmobile1 haha thanks!
briansmobile1 I love your channel
I am no engineer, just a shade tree gyroplane designer wannabe.
This vid has been a great help to me understanding this phenomenon.
Thanks for taking the time to produce an excellent presentation.
Greetings from Australia.
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.
I absolutely clicked for the googly eyes. But I also like physics.
If i designed a building it would have googly eyes
hah, me too
Imagine a tsunami barrier with googly eyes
"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.
Those are spelled 'lose' and 'caviar'.
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"
Love the way you enhance your discussions with video and examples. Well done Grady!
I'm mechanical engineer and I'm studying mechanical vibrations and this video helped me in my project
Turn down the edm bub
Logan?
Souljah Boy, crank that shit
Gonna have to disagree. Bangerz and engineering go hand in hand
What's with all this annoying science talk in my dubstep?
3:40 "Looks like it came straight off the island of mistiff mascots."
Oh, you mean Japan.
I think it's a south park reference
Wednesdays definitely come BEFORE Thursdays
Technically true that Wednesdays do come after Thursdays, until the end.
But Wednesdays do come after Thursdays. 6 days after to be precise.
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.
Bless you for taking the time to create these amazing videos! I am 40yo and have financial training and find your posts inspiring. Going to get my six year old to start watching. Keep going!!
2:22 for my entire life, Wednesdays do not come after Thursdays...
#LIVELIFEBACKWARDS
:P haha it made me question my whole existence for a second though... haha
They do, just simply 6 days afterwards.
Both Thursdays and Wednesdays come after each other, no fallacy here.
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.
Yeah like a secondary, lighter weight, less dampened pendulum
....and make it upside down-on top of the first!
...with a hot dog mascot
Fact: Putting googly eyes on ANYTHING helps with depression.
It also alleviates fear of plants, as proven by Christopher Walken.
that !?!?!?!? in the chaos damping system was hilarious
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.
just found this channel. great stuff keep it up
My man, those music cuts! Please tune it down xD
8:22 WHAT? I don't want to be an engineer anymore.
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.
Great video. Thanks for sharing. As an engineer I can clearly see that you have the gift of good teaching.
Can we harvest energy from those vibrations by using let say piezoelectric effect?
Elzero Dragon good idea, but the building has to be in one really disturbing climate region, to amount some decent production.
It'll still be very small..
It won't be efficient and occupant comfort would be hard to achieve
Yes. E=1/2 mv^2, no matter how you slice it. Then comes the economic analysis. If the system costs $500,000 to design and install and $1,000 annually to maintain, and it generates $4,000 a year in electricity, you'll probably opt out.
Another thing to remember is that generating electricity from movement will dampen the movement of the object, which might make it less effective at its primary task.
What if...
What if you put several TMDs in parallel, having them each hang from the same roof?
What if you put them in series, dampening a dampener dampening a dampener dampening a dampener....
woahhh
To your first question--- you get the same effect. The positive result of the damper is the horizontal component of the force vector at each level, and you only get one net vector per level regardless of the number sources.
To your second question-- similar to the first response: you only get the benefit from the point of attachement of the pendulum to the diaphragm. Everything that happens below there will amount to one net pendulum/damper combo as far as the building can tell. And if the net period is off as a result of your series, you accomplished nothing.
@@HollywoodF1 What about a series of separate pendulums at harmonic distances? say on the 20th, 10th, and 5th floors, for example?
Dugo akong ilong...atay njd...
@@HollywoodF1 Actually no, it would be much worse than that. Having one pendulum attached to another is the classic example of a chaotic system. If you tried to use such a setup as a TMD, you would _usually_ get a smaller effect (as the lower TMD would dampen the upper TMD, meaning less dampening action for the upper TMD to apply to the building.)
But sometimes it would damp much better than expected.. and every once in a while, you would end up with the system swinging wildly out of control and potentially even having a negative dampening affect (albeit only for short intervals.) Chaotic motion can be quite the mess.
nice video and explanation. which software did you use to simulate the shaking of building in starting.
+Sameer Tuteja phun
Algodoo
I believe it is algodoo, which is newer than phun, but they are almost exactly the same thing.
Research for "TUG". This was really informative to someone who knows very little about engineering, and fun too. Glad I found this page.
Nice to see the Mathematical theories shown in terms of science experiments. Really helpful. Thank you!
That was really interesting, nice video :-)
+MrGeolites Thank you
"Profoundly uncomfortable"? try "Utterly terrifying" lol
That test was a good simple example. In the real world couldn't they incorporate an electronic device to vary the drag on damper as to transfer more energy to it?
I do believe that's exactly what they do.
@@vincentrobinette1507 There are such systems in use, but there's a very real danger that a failure in these systems could lower the damper's effectiveness to what could be catastrophic levels. Simplest is best here only because it has the fewest possible failure points.
@@P_RO_ That's why I would use such simple systems. A copper or aluminum disc and permanent magnets would be quite reliable. So would simple passive hydraulic shock absorbers, not unlike you find in a car or truck. I agree: Forget the electronics! During a seismic event, you can't count on electrical systems of any kind.
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.)
Amazing. I don't understand all the math behind it, but the practical applications are fascinating.
8:30 Oh naaaw the googli mahn :((
The lamp got jealous
9:36. “A one percent-er on the top floor to lose his caviar... Hilarious! I love it.
LPT: change screen frequency to not be same/half/close to the same frequency as the camera
First Practical Engineering video?!? I'm glad this came up as a suggestion. Love this channel. Can't wait to get the book
I do so wish my physics professors had been as practical as you are, Grady. Thanks Gobs for your videos!
this background music tho
At 45 seconds what is that program?
Algodoo
2:23 “Wednesdays come after Thursdays” great video though, lol
The googly eyes on the model skyscraper are fantastic!
I'm not an engineer or anything of the sort but love the videos, content and presentation - so glad I found your channel!