Fun fact: Taipei 101, one of the tallest skyscrapers in the world located in Taipei, Taiwan, also uses the stabilisation principle with the pendulum to counter the forces of both the earthquake and heavy winds of typhoons.
There is an important difference though, which is that the pendulum in the 101 has hydraulic dampeners between it and the building, which is what's missing in this video. He should have added them between the short pendulum and the frame structure of the building.
Changing your design only changes the resonant frequency. Ideally, you'd be testing for a range of what the object could be subjected to, and make sure it doesn't resonate within that range.
Since concrete is better in compression than torsion, the counterweight helps the structure to stay as it is built, with perpendicular angles, the ultimate improvement would be (as it was on several skyscrapers) to add a marbles rolling suspension to the foundations so the structure slides along and stays straight. Unfortunately the last vibrations you don't account for is vertical, this is where dampers would be useful.
Yellow case: Earthquate is operating at the eigenfrequency corresponding to the resonance eigenmode shown here. No damping or mass damping. Blue case: Damping and stiffness are introduced due to the rubber. The damping results in a reduction of the resonance Q factor, and the introduced low stiffness (although little thickness), reduces the total eigenfrequency of the system, operating in the mass damping regime. Orange case: TMD as the description mentioned. It's about efficient energy transfer from the building to the oscilating mass. Since the stiffness and thus the eigenfrequency of the building is quite high, you need to match that eigenfrequency preferably with the oscillating mass. You do so by shortening the length of the coord, increasing the oscillating's mass eigenfrequency and match it to the structure's. Aside to energy transfer, the increased mass of the oscillating mass reduces the eigenfrequency of the total system, which you need to account for. However, this helps with increased mass damping.
@@whacker9265 Thank you! That's correct, I have a masters degree in Hightech mechanical engineering, focus on mechatronic system design. Maybe to elaborate a bit more.. Working with signals for automation purposes, that includes mechanical engineering has a ton of overlap with other disciplines. Some examples are frequency studies in acoustic, electro, civil, architecture, structural engineering. Here I applied my masters knowledge in mechanical engineering to understand what happens with the structure in the frequency domain. The physics are exactly the same. It's cool to understand the universe around you bit by bit and engineer/hack the sh*t out of it ;)
Off-topic advice ... The best way to apply decals and signage is to weed them, apply a premask on top, align and secure (tape) the premask in place, then peel the backing away while you squeegee onto the surface. There's tricks and variations for larger decals. Sounds complicated, but there's videos of the process, it's the standard in the profession, it's easier, faster, and gets better results.
Great demonstration of tuned mass damper (TMD). Another popular approach is base isolation (BI). Would be interesting to see that one too and compare with TMD.
i wonder, these tips are only practical for higher buildings ? Can it be allied to waves and ferries over ocean ? like Sea-sickness proof [chair], [capsule], and [room]. maybe A whole sea-sickness proof Ferry.
Interesting to see, that the middle building has a 180° phase difference to the outer two. Nice video. To me the building phase was just a bit too long in comparison to the rest of the video. It was cut well though.
Pendulums are only works (as they are actually used) with DAMPING. Or cancel each other out with the vibration frequency of the whole building (no damping, not actually used).
If that were a 150ft wide building, it would be shifting something like 20ft in each direction from center. I don’t think your problem is frequency. Amplitude, maybe; but I doubt it’s how frequently a wave hits.
I'm not trying to get all MythBusters on you, but did you try switching the 3 versions around to check for different results? Maybe putting the yellow one at the end might reduce the wobbling as the first 2 absorb some of that movement. I feel like you'd get different results switching the blue with the orange as well. Maybe putting tape on the back wall and measuring the difference in movement could have helped. But amazing work and you have some crazy skills. I should probably shut up now. Sorry. 😅
Very Interesting! I would be interested to see how specific these solutions are to the gearratio? frequency? Is that pendulum suddenly useless when a different frequency is applied? Thanks for the great demo!
Very specific to frequency of excitation. The structure's natural frequency (or resonance frequency) is dependent on mass and stiffness. Most of the mass is in the big wheel and the battery. Stiffness comes from the structure itself. Base excitation causes massive displacements when its frequency (dependent on the gear ratio) is close to the building's natural frequency. This is shown in the very first test where it didn't move much because the excitation frequency was too high. As for the pendulum, or mass damper, I think its main effect in this example would be just the increase in mass effecting the structure's natural frequency, moving it further away from the frequency of the excitation. It would be an interesting test to lower excitation frequency and see if the one with the pendulum started shaking uncontrollably while the others act fine.
Fun fact: Taipei 101, one of the tallest skyscrapers in the world located in Taipei, Taiwan, also uses the stabilisation principle with the pendulum to counter the forces of both the earthquake and heavy winds of typhoons.
Indeed! the mass is 660 metric tons and it's amazing to see in action: th-cam.com/video/Tkz6b7Q3dRk/w-d-xo.html
There is an important difference though, which is that the pendulum in the 101 has hydraulic dampeners between it and the building, which is what's missing in this video. He should have added them between the short pendulum and the frame structure of the building.
Don't the skinny skyscrapers in New York also use a mass damper? (they also used them on ocean liners and in F1 cars)
@@anthroparion the super skinny super tall one just uses a big pool of water
Changing your design only changes the resonant frequency. Ideally, you'd be testing for a range of what the object could be subjected to, and make sure it doesn't resonate within that range.
Since concrete is better in compression than torsion, the counterweight helps the structure to stay as it is built, with perpendicular angles, the ultimate improvement would be (as it was on several skyscrapers) to add a marbles rolling suspension to the foundations so the structure slides along and stays straight. Unfortunately the last vibrations you don't account for is vertical, this is where dampers would be useful.
Awesome. Incredible to see the forces simulated with just some toy bricks. Subbed instantly.
Yellow case: Earthquate is operating at the eigenfrequency corresponding to the resonance eigenmode shown here. No damping or mass damping.
Blue case: Damping and stiffness are introduced due to the rubber. The damping results in a reduction of the resonance Q factor, and the introduced low stiffness (although little thickness), reduces the total eigenfrequency of the system, operating in the mass damping regime.
Orange case: TMD as the description mentioned. It's about efficient energy transfer from the building to the oscilating mass. Since the stiffness and thus the eigenfrequency of the building is quite high, you need to match that eigenfrequency preferably with the oscillating mass. You do so by shortening the length of the coord, increasing the oscillating's mass eigenfrequency and match it to the structure's. Aside to energy transfer, the increased mass of the oscillating mass reduces the eigenfrequency of the total system, which you need to account for. However, this helps with increased mass damping.
You said yellow twice, you donut.
I understood none of this but good on you for being able to understand
@@whacker9265 oops
@@TimothyKNetherlands you’re good, might you have a degree in physics or engineering?
@@whacker9265 Thank you! That's correct, I have a masters degree in Hightech mechanical engineering, focus on mechatronic system design. Maybe to elaborate a bit more.. Working with signals for automation purposes, that includes mechanical engineering has a ton of overlap with other disciplines. Some examples are frequency studies in acoustic, electro, civil, architecture, structural engineering. Here I applied my masters knowledge in mechanical engineering to understand what happens with the structure in the frequency domain. The physics are exactly the same. It's cool to understand the universe around you bit by bit and engineer/hack the sh*t out of it ;)
This is just sooo well made!
And congrats on your previous video reaching 500k!!
Thank u so much!
The blue one might be the most earthquake resistant, but the yellow one is definitely having the most fun!
Off-topic advice ... The best way to apply decals and signage is to weed them, apply a premask on top, align and secure (tape) the premask in place, then peel the backing away while you squeegee onto the surface. There's tricks and variations for larger decals. Sounds complicated, but there's videos of the process, it's the standard in the profession, it's easier, faster, and gets better results.
I loved this video. It really showed how different types of building compare against earthquakes.
A lego tuned mass damper! Really cool!!!
Why those snappy connect sounds are so satisfying???
Great demonstration of tuned mass damper (TMD). Another popular approach is base isolation (BI). Would be interesting to see that one too and compare with TMD.
Middle one is kind of base isolation, with the rubber supports at the bottom
Brick-click ASMR with no narration just hits different at 3:00 AM
[when you should be asleep]
Really impressive! This is a great physical example of beam vibrations which you can take entire college classes on!
i wonder, these tips are only practical for higher buildings ?
Can it be allied to waves and ferries over ocean ?
like Sea-sickness proof [chair], [capsule], and [room].
maybe A whole sea-sickness proof Ferry.
If a girl asked “what do you do for a living” and he responded, “oh I build legos”. She would never know how genius this guy actually is lol
Interesting to see, that the middle building has a 180° phase difference to the outer two.
Nice video. To me the building phase was just a bit too long in comparison to the rest of the video. It was cut well though.
I thought it was fine, especially since this is already a pretty short video (less than 10 minutes in length).
Hmm that is interesting. I had to rewatch that.......this needs more sciencing
Love the editing :)
Damn, those towers vibin
Pendulums are only works (as they are actually used) with DAMPING. Or cancel each other out with the vibration frequency of the whole building (no damping, not actually used).
1:58 sounds like climbing up a ladder in Minecraft
The ground motion is not just horizontal, you should add some vertical too. Also the wavelength is not always constant, slows down, then speeds up.
Gatdam that beat at the end hits hard
Perfect ending.
If that were a 150ft wide building, it would be shifting something like 20ft in each direction from center. I don’t think your problem is frequency. Amplitude, maybe; but I doubt it’s how frequently a wave hits.
Super cool structures.
I really wanted to see the combined blue and orange dampening methods.
@Brick Builds
The "pendulum" just bangs one the beams
The end is one of the best parts where u see the yellow one barely not touching the blue one 😂
I really liked this video. Very cool testing.
And where did you get your decals made up ? I would very much like like that source lol.
What if we combine pendulum and rubber bricks?
Beautiful execution. What about a combination of the two damping methods?
What if you combine the rubber legs with the pendulum?
I'm not trying to get all MythBusters on you, but did you try switching the 3 versions around to check for different results?
Maybe putting the yellow one at the end might reduce the wobbling as the first 2 absorb some of that movement.
I feel like you'd get different results switching the blue with the orange as well.
Maybe putting tape on the back wall and measuring the difference in movement could have helped.
But amazing work and you have some crazy skills.
I should probably shut up now. Sorry. 😅
Japanese Natural Disaster management: Holdon to my ricktar scale.
Wow, those crusty fingers🤘🤘
It's great but earthquake shaking is not one direction; "regular variation in magnitude or position around a central point".
Very Interesting! I would be interested to see how specific these solutions are to the gearratio? frequency? Is that pendulum suddenly useless when a different frequency is applied?
Thanks for the great demo!
Very specific to frequency of excitation. The structure's natural frequency (or resonance frequency) is dependent on mass and stiffness. Most of the mass is in the big wheel and the battery. Stiffness comes from the structure itself. Base excitation causes massive displacements when its frequency (dependent on the gear ratio) is close to the building's natural frequency. This is shown in the very first test where it didn't move much because the excitation frequency was too high.
As for the pendulum, or mass damper, I think its main effect in this example would be just the increase in mass effecting the structure's natural frequency, moving it further away from the frequency of the excitation. It would be an interesting test to lower excitation frequency and see if the one with the pendulum started shaking uncontrollably while the others act fine.
@@samueljames0908 Neat! Thanks for the extra info!
Good
I'm no engineer but the pendulum one seems the most stable
thus it requires to support the extra weight
it should be applicable to all earthquake intensity
turkish engineers might need your help
fr
Do more experiments!
have you done any lego quad copters?
Lmao the six failed spring attempts. You literally introduced pins into the structure
What will happened if i crash a plane into it
Where do you buy that much lego?
What will happen if you run the wheel on top at certain speed?
maybe gyroscope effect?
adamlar lego ile yapıyo biz şimdi yapamıyoruz
just in time for the turkey disaster.
DO THE EARTHQUAKE!!!
6:53: LEGO Techo
are those springs modded? and btw, make a vid where the skyscrapers get plane proof
2:33
Yeah, turkey building engineers have to take note of this
Now cOmBiNe
3d printer from Lego
Send this video to Erdoğan.
#prayforturkiye
Just turn off the earth quake machine... Problem solved 👌
second!!!
):👍⚰️2022
Brick technology copy
(Disliked for foul language).
2:32