21. Vibration Isolation

[@georgesadler7830]

DR. Vandiver , thank you for a beautiful lecture and demonstration of Vibration Isolation. These lectures defines a solid makeup of Mechanical Engineering in the real world. I hope that Mechanical Engineering students all over the world are enjoying these classic lectures.

[@BoneyardShadow]

This has been great. This lectures represent the beauty of mechanical engineering, makes me glad I am part of this world.

[@syakirazmi5038]

I'm glad I'm not in MIT. These students are geniuses to get it right off the bat. I need to replay a couple of times to even begin understanding this lecture.

[@emmanueloluga9770]

remember this is lecture 21 from a series on this topic

[@miguelmeireles2954]

thank you i know i am

[@miguelmeireles2954]

you are an amateur

[@zbi2169]

@@emmanueloluga9770 Pretty sure it's not. Are you talking about vibrations or vibration isolation? He introduces the topic right now

[@adambruce1688]

Syakir--there's no shame in needing to replay and gain a deeper understanding. I (successfully) defended my PhD two days ago; one of the big projects of my thesis was vibrational isolation for space telescopes. I started my education with OCW in my Dad's house over 12 years ago at the age of 16. I struggled, replayed, tried the exercises, struggled more..rinse and repeat for 12 years. I have now taught dynamics twice to graduate students in aerospace and mechanical engineering. It is a subtle subject, and there is no shame in needing to revisit the concepts. Remember, it took years even for geniuses like Newton, Lagrange, Hamilton, and Jacobi to really get this stuff! The only real mistake is giving up!!

[@冰糖葫芦-x2f]

this teacher is good , the function of the theory explain so clearly.

[@jiaweishi7226]

WOW, some truely practical knowledge! Really lucky to be able to watch his teaching!

[@kdmq]

"Is everyone even awake?" sounds about right

[@lineage13]

Change your frequency or hz to skip at vibration points.

[@tornjak096]

This was the best lecture by now !

[@anonbro7368]

i love you professor i wish i had a professor like you, it's so easy to understand vibrations on your lectures,

[@miguelmeireles2954]

love you too

[@flavioing1]

Very special Professor. Thank a lot to MIT for these lessons.

[@vondelpark8141]

Great audio to listen to when composing ambient music!

[@cheedu100]

Loving these lectures!

[@beefybeef1326]

Great lecture. Thank you for sharing this! Much appreciated

[@flymulticopter7929]

appriciate it, thanks Dr!

[@skilstopaybils4014]

why bother with the comb-over?

[@wallaceyang7971]

Thank you for a great lecture Prof. Kim Vandiver. A couple of questions: 1)From what little I know, a common strategy is to place isolation pads between the motor and the table, in your first problem. We get to choose the material and the thickness. It seems difficult to find the damping value c for many materials, and is c related to thickness? 2)Continuing to put isolation pads beneath the motor, there seems to be another equation called power law frequency-dependent attenuation, where the pressure waves are attenuated by the thickness of the material we use for isolation. Pressure attenuates by exp(-a*w^n * x), where a is constant, w is angular frequency, n ranges from 0-2 depending on material, and x is the thickness of the pad. Can you please reconcile this equation with what you have shown in this lecture? Thanks.

[@IBMua]

1:03:25 - probably forgot that /(2*pi) it seems.

[@brainstormingsharing1309]

Absolutely well done and definitely keep it up!!! 👍👍👍👍👍

[@christinanasika1297]

Do they eat in class in MIT?

[@MS-ld3jn]

At 4:19 the guy with the dark gray shirt in the second row on the left was taking a little nibble behind Prof Vandiver's back lol

[@martinhugo8736]

If the application was not a cantilever bean, but actually a table, how does isolating the receiver method apply to the table?. increasing the beams length decreased the response of the system, x. given its a beam, it is possible to calculate the k. how do i do the same with a table?. is it equivalent to moving the table a longer distance away to from the source?

[@maheshvalmiki]

My opinion goes to isolate the source of vibration itself. Which solves 90% of problems. Rest to check imbalance in equipment etc...

[@happyonly6345]

Why did increasing the mass to the vibration source make things worse?

[@syedwaleedshah2830]

beautiful

[@Vicky-pb5hg]

At 38:31 , shouldn't we have m(x_tt + y_tt) in the EoM. Only m(x_tt) has been considered. Why is that?

[@jkhong25]

Vicky because the system we consider is only for mass m which is in the x cordinate. Thus the inertia term is only for x

[@ColocasiaCorm]

2:54 56:54

[@ColocasiaCorm]

3.31

[@theaudioman4446]

I need this guy to set-up my hifi

[@ColocasiaCorm]

lmao that's exactly why i'm here

[@Anomander888]

I'm still watching this man And I still haven't a clue what he's talking about

[@francescoindolfo]

why there was a minus sign in front of tan'-1 and then it has disappear?

[@jkhong25]

Francesco Indolfo because the tan inverse function is an odd function( means that f(x)=-f(-x) ). So in this case the imaginary part of the transfer function is minus, the minus sign has disappear.

[@ayushgupta5061]

very nice presentation !

[@Kenan2730]

Why he says wN but writes wm?

[@connorharris1900]

his notation is driving me insane

[@sidenvironnement382]

Thanks a lot. Very interesting 👏

[@禹萧何]

professor i love you！

[@nazirsadiq6432]

Brilliance

[@Commandermgn]

Bei solchen Vorlesungen irritiert mich der statisch überbestimmte Tisch doch am meisten, den man mit einem Keil am Wackeln hindern muss.

[@salmanjalali]

This is sweet!

[@miguelmeireles2954]

have you tried chocolate cake

[@ColocasiaCorm]

i didn't like his ruler experiment. you needed both a ruler and a balance, right? the prediction of res freq required both deflection and mass.

[@ColocasiaCorm]

ah I misunderstood. all you needed was deflection and gravitational constant. that is cool!

[@ColocasiaCorm]

i guess your deflection would want to be in meters units if you use m/s/s for g.

[@Tadesan]

Well, at least I know I'm smart enough for MIT...

[@rabenklang7]

thank you, nice lecture! :)

[@upanddown7911]

thank you sir！

[@animisteddie8193]

12:15

[@animisteddie8193]

34:18

[@Dmytro-zj9it]

Мне 37 и я тоже хочу так учиться!

[@eglintonflats]

He is just copying a book and they pay 40grands a year for this.

[@LearnWithFardin]

💝☘️

[@vincenzocasa8020]

Vedi su KZbin " antisismico su rulli autocentranti per gravità ", brevetto n° 0001429105 di Vincenzo Casa.

[@nigelinNL3160]

He's horribly all over the place with his sig. figs though.