How do you make them bounce /a/?
>>149729428
You apply a force greater than the damping constant of the soft body in question.
>>149731040
Makes sense
>>149731040
Can you explain this again but in the language of mathematics?
>>149731571
Gimme a minute. I'm already sketching it out.
>>149731571
Before we go into the math, we have to start with the anatomy.
The mammalian breast consists of lactiferous glands embedded in adipose tissue, and held up by an elastic part known as Cooper's ligaments. Breasts typically range in weight from 500 to 1000 grams.
>>149732058
Human tissue is generally incompressible, so the elastic properties can be summarized as a simple relationship between the strain and the elastic modulus. In breast adipose tissue, this is:
0.01: 4.8
0.05: 6.6
0.10: 10.4
0.14: 17.4
The strains are all nominal (engineering) strains, and if I'm reading this report right, the moduli are all in kPa.
(Finding a somewhat more comprehensive source to go off of)
However, the property that determines the "jiggle" is the shear modulus. This can be anywhere from 0.5 to 25kPa in a healthy young woman
>>149732058
>>149732598
>>149732990
You're very dedicated towards this
go on.....
>>149733687
I'm working on it. I'm trying to set up a model.
>>149733789
A what?
>>149734227
A breast theoretically has three axis of movement and three degrees of freedom (none of them rotational). HOWEVER, if we're talking about "bounce", then the only one we're concerned with is the vertical direction. Therefore, we can model the breast as a mass connected to a frame (the ribcage) via an elastic spring and a viscous damper.
>>149734227
he's paying a hooker to come round so he can prove his data.
>>149729428
Cowgirl position.
what the fuck is going on here
>>149729428
If they're not bouncing you're not pumping hard enough
>>149734411
I'm attempting to calculate the dynamics of a human breast.
Also, Anthony Bourdain is doing a new episode on Japan on CNN right now, if you're interested.
>>149734470
You should screencap this thread and start another one once you're done, because is most likely this will die before you finish.
>>149732058
>>149732598
>>149732990
>>149734227
I hope we get to Sakura Trick levels of bullshit.
>>149734280
Nah, I don't have the time or the money for that. There's plenty of medical literature on the subject.
>>149735007
I'm trying to keep it alive by posting pieces of my work as I go.
Keep going, I wanna to see where this goes, and I guess a post in ten minutes is enough
>>149735029
Fair enough, I'll do my best to keep this alive.
>>149735128
>>149735258
http://mathb.in/105804 to derive the spring constant from the bulk parameters.
non knows
butts
>>149735425
Modeling the breast as an approximately uniform hemisphere with a known volume (from cup size):
http://mathb.in/105806
bumping for physics
To make things easier, let's take one of the larger-busted Keijo players, with a DD cup (volume 1900 ml) and 1kg mass, and a modulus of 15kPa. That gives us a spring constant of 4561.83 N/m. We also, thanks to a handy calculator, have a viscous damping constant of 0.02 Pa*s.
bumping to keep the physics alive
>>149731571
>>149733687
>>149735007
>>149735012
>>149735128
>>149735258
>>149736477
>>149737577
And FINALLY, plugging the aforementioned values into OpenModelica and simulating, we get this lovely velocity plot.
Sources:
http://www.sciencedirect.com/science/article/pii/S0020768310002465
https://www.eng.tau.ac.il/~msbm/resources/55.PDF
http://www.emeraldinsight.com/doi/pdfplus/10.1108/09556221111166284
https://www.ncbi.nlm.nih.gov/pubmed/26403697
https://www.ncbi.nlm.nih.gov/pubmed/24509183
http://www.tribology-abc.com/calculators/damping_1.htm
>>149737662
I'm too understand this
>>149737884
Hold on, I think I made a mistake with the simulator. Give me a couple minutes to fix it.
>>149737884
too dumb to*
If she let me massage them, I can make them bigger
>>149737938
Does that actually work? Do you have to do it everyday for hours on end? I'm willing to massage her breats to get them bigger too, I just wanna know how much time and effort I have put it in.
>>149738091
Sadly no. The size of breasts is dependent on body fat, water, and hormone levels. Not massaging.
>>149738199
but remember that to get a good ass you can make some squats and get good results, that's why I am an ass man
>>149735425
>http://mathb.in/105804
dis nigga
>>149737662
How does this exist?
>>149737662
I'm emotionally conflicted
>>149735012
So many years later, and my shitty image is still used. It brings a tear to my eye
>>149737662
I'm still not getting it right.
The way I'm doing it is causing the mass to be pulled indefinitely downwards, which is clearly not what happens.
Who knew breasts could be so complicated?
>>149738436
I'm in that image as well.
>>149738461
>>149737662
What was the deleted file?
I HAVE TO KNOW
>>149738562
It was a simple line plot. I deleted it because I realized it was wrong. I'm still trying to debug the model.
>>149738583
Not nearly as excited, but good work on putting all this together nonetheless.
I am confused how a bunch of fucking autists are confused that legitimate research and scientific activity were put into properly understanding and mathematically explaining breast physics.
>>149738091
Anon, if rubbing a body part could make it bigger, every man on earth would be standing on his own dick half the time.
>>149738583
Any progress?
>>149738316
>>149738389
>>149738421
>>149738461
>>149738562
>>149738658
>>149739561
Got it. Finally. Only took another hour.
Here is the lumped component model in its final form. The breast is represented by mass1 and a standard human jump of 2m/s^2 for 0.1s is used as the initial impulse.
The Modelica source code is available at https://www.pastery.net/fgqhxa/ under the GNU GPLv3.
>>149739704
>11 Hz breasts
wat
>>149740181
Well if you jump around too much, of course they'll hertz.
>>149740327
fucking carlos
>>149735550
The filename doesn't add up with the webm
>>149740486
Yes it does.
>>149740806
Did you load the subs into a raw? You savage.
>>149739704
>>149740144
HE DID IT. THE ABSOLUTE MADMAN
>>149739704
>>149740144
Can't really put into words how bewildered I am
>>149740144
now I've seen everything
>>149739704
>>149740144
>Took an hour for shit a 5 year old could've done and said
Sasuga /a/
>>149741486
There's a difference between making an observation and quantifying it.
I'm sure /a/ could write dozens of peer-reviewed papers about physics of female breasts.
>>149741535
All of my work was based on existing scientific papers on the subject. Apparently a lot of research has been done on clinical elastography.
Yes, that's right folks, doctors are trying to diagnose breast cancer by measuring how it affects breast jiggling.
>>149741535
/a/ Can write everything on breasts except how they feel.
>>149741606
I knew Science can be fun!
Where do I join??
Or do I have some experience with breasts before I'm allowed to join?
>>149729428
>this thread
I'm conflicted over what to consider of this.
>>149741675
Given how little free time med-track students seem to have, I'm sure more than one male gynecologist has had no personal experience with breast tissue until their residency.
>>149740144
plz gib software
>>149742133
I already said, OpenModelica. It's available for free.
>>149729428
>vlcsnap
>>149742274
And? Your point is..?
>>149742844
You're a pleb
>Keijo brings out the best in /a/
This is why I'm still here.
She can do 30 thrust in 40 animation frames. At 29 frame/second, that means 1.38 seconds. That means 21.75 thrusts per second. If you assume each of her thrusts travels 2 feet out and 2 feet back in, that's a distance of 4 feet, 21.75 times per second, or 87 feet per second. Basically, her hips can move at the speed of 59.318mph. In short, sex with her will mean certain death.
>>149735550
This is so disgusting...
>>149729428
Is that an armored suit?ERECT NIPPLES IN SKINTIGHT BODYSUITS
>>149739704
sorry, but what's the y-axis supposed to represent?
>>149744280
I'd tell you to tie a noose and suspend yourself permanently but it wouldn't befair to the rope.
>>149743109
You're an idiot. vlc is perfectly fine, and when you adjust the settings properly it is superior to MPC or anything else. BUT you probably tried it on default once and saw pixelation, or not even that you just saw some memes and decided to treat them as word of god.
>>149743751
Then I just have to train my dick to withstand speeds of over 60 mph. With time, weights, steroids, and repressed sexual frustration, I can achieve anything my dick desires.
Literally who is this shit made for?
>>149743751
Basically like multiple footballs to the nads
https://www.youtube.com/watch?v=xfBuj5MbAkA
Casuals will pick up the shock rifle, fire over someone elses shoulder and complain about how it did nothing instead of a double damage headshot. Then they're go back to playing McREE.
>>149740144
I don't understand a pixel or word of this, but I'll trust what you say, math wizard.
>>149732598
what is the best method to slice her tits off and roast them over a fire?
>>149735550
>>149745176
This is literally first year engineering stuff
>>149745467
math is for nerds
>>149744575
This.
The guy probably thinks screencapping a stream is better.
>>149745467
Yeah, and everyone on earth is an engineer, amirite?
>>149744669
A better question is who ISN'T it made for? People who love hot blooded action? Check. People who love tits? Check. People who love ass? Check. People who love fucking intense music? Check. People who love SOL? Check. If you don't fall under any of these categories, you aren't important anyway.
And thus Asstronomy was established IRL
is this /u/?
>>149746994
No it's /sp/
Who screencapping this?
>>149747479
It's nothing mindblowing, anon. This is derp_commander's thing. If anything, the thing he did for Haruhi was more impressive.
>>149748201
My wife Aoba is unimpressed!
>>149747499
Wait, what'd he do?
>>149747499
Really? Because I'd say this was his most impressive work by far.
>>149744401
Vertical displacement.
>>149743751
yeah but she can also decelerate and accelerate her butt from 60 mhp to zero in less than a 1/24 of a second. That's at least an accelleration of 236 g which is enough to kill the most hardcore supersonic airplane pilot in a metter of seconds
I'm surprised this thread is still up
>>149749800
I've long since come to the understanding that anime battle shounen characters are immune to forces that would kill any one of us.
>>149746994
No, this is /sci/.
>>149749800
>yeah but she can also decelerate and accelerate her butt from 60 mhp to zero in less than a 1/24 of a second
60 burgers per hour is the average speed. During the acceleration and de-acceleration process she is obviously slower than her maximum speed. So assuming constant acceleration and de-acceleration her maximum speed would be 120 bph.
It wouldn't kill an airplane pilet in a matter of seconds, but rather in a matter of a brink of a second.
What about chuuni goketsu, she is much faster than anything show in the anime so far.
>>149751295
Who are you referring to?
>>149751805
http://raw.senmanga.com/Keijo/157/15
Check a few pages before and after.
>>149751870
I will as soon as I get out of class.
>>149751870
I... I have no words.
Anyway, I can't do the calculations with just the manga. With the anime I can use the framerate to figure out the times so I can determine the velocities, but I can't do that with the manga.
>>149752633
On that scene they do show that she did it all in one second, looking at the match chronometer.
But yes, should still be complicated to calculate anything.
Is this the thinking man's thread?
>>149752712
First of all, I tracked down the character's name as being Kujaku Naki.
Second, there are only four characters that have been given canonical heights: Nozomi, Sayaka, Kazane, and Non. I'd need one of them in the same frame, or something else of a known height, to determine the distances.
>>149740144
This is high-school level physics but this picture make it seem extremely complicated.
>>149753247
I don't think we ever really discussed non-rigid bodies in my high school physics class.
>>149753063
Looking through the chapter, one character who *is* in a panel with Naki is Sayaka.
According to ImageJ, based on this image and her canonical height of 164cm, Sayaka's head is 26.25cm tall.
And using this gif, Rinrin's head is 23.78cm tall.
>>149753063
can you use maths to figure out the best way to slice her tits off and roast them over a fire?
>>149753778
And using this, Naki's head should be around 23.03cm tall.
Bump to keep the math going
I've screen capped the thread & will start working on the pic once your done the brain work
>>149735550
anyone else want to lick that midriff/navel. god damn I love tummy windows and midriff.
>>149754170
The distance from the base of her neck to her hip is about 38.30cm, and from there to her knee is an additional 35.65cm.
Also, the fuck? Did she just remove her swimsuit bottom?
>>149748998
Tripfags are the worst
anotha bump take your time anon>>149754469
>>149754761
bump for keijo+math
>>149754469
She had to dry it off.
Suprise bump bwahhh
What the actual fuck is going on
>>149744575
>not using madvr and LAV codecs
pleb
>>149755255
Wouldn't exposing yourself though be against the rules in a supposedly family-friendly sport though?
>>149757472
*exposing yourself be against the rules
>>149729428
Gimp suit is not for flat, pouty outfighters
>>149757598
I would be very hard pressed to call her "flat". "Flat" would be an A cup or less. She's at least a B.
>>149757933
I actually think Nozomi says she's a C-cup in that chapter where she tries to guess Aoba's size.
But that is still Keijo flat
>>149756540
SCIENCE!
>>149751295
Unfortunately, after careful analysis, I can't tell how fast she's moving during that interval, since the panels are too disjointed and her movements too complex to figure out the distance she's covering in that time.
I can tell you however, that to be able to jump as high as is shown in this page, she has to be able to lift off at 7.36m/s
>>149750128
You underestimate the power of autism.
>>149759303
This man gets it
>>149759487
Well if it can elect a president, there's probably very little it can't do.
>>149758598
So is their anything else you would like to state before this amazing thread dies so i may screencap for future use?
>>149745467
First year engineering students have a physics knowledge surpassing that of 99.9% of the population.
>>149760888
well yeah but to be fair the average person doesn't really require the knowledge of engineering physics in their day to day, so isn't much of a reasoning for them to know this kind of stuff
>>149739704
Wait, so if I'm reading this correctly, a breast displaces half a millimeter and returns to its original position 11 times in one second?
>this thread
>>149761628
Given the states parameters, and assuming the model is correct.
In reality, I would suspect that the effective viscosity is much greater than I've chosen, so you'd probably get one or two jiggles at most.
Screen Cap When
>>149762882
That, and displacement an order of magnitude higher.
Tell /r/4chan this thread is gay an forced.
sah-gay
>>149733635
How can you say you love tits if you won't even do the math?
Anon who requested the math last night here
Just got back on and this thread is still alive. Didnt think id actually get a response much less an answer with this much depth. Thx d_c
>>149766171
Math was not my best subject
>>149766032
>/r/4chan exists
Holy fuck, why?
>>149767164
Do it for tits, man.
>>149757472
They get ero cards if swimwear gets destroyed or expose their bits. Do it enough and you get disqualified. This happened during Nozomi and Miyata's race.
In Naki's case, she did it extremely HAYAI and the ref probably didn't see it.
>>149729428
what anime?
>>149767309
I will. For tits.
>>149767633
'Keijo!!!!!!!!'
>>149741624
Under-appreciated comment desu
>>149754495
Tell me about it.