Moving a piston with math #1

3ds video tutorial showing how to move the head of an engine piston assigning the motion equation.
(If you need only the equation step skip to 3:51 )

Until the modeling step (6), the "dynamic function" is editable by its main parameters L and r: so you are able to modify the crank's and rod's length as you wish.
Each piston system depends only by its chassis's local coordinates.

p.s.: there are more simply methods (but less accurate) to get the same results like Inverse Kinematic System or Reactors.

Don't forget to watch the part #2 about "not centered pistons"!
http://www.youtube.com/watch?v=BIgeyax1euw

Special thanks to Paul and its amazing music stuff, for the Doom song mp3!
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Video tutorial su come animare in 3ds il pistone (di un manovellismo di spinta centrato) assegnando ad esso l'equazione del moto.
La "funzione dinamica" assegnata, finchè non si passa alla modellazione (step 6), è in qualunque momento modificabile variando i parametri caratteristici del sistema L ed r.
Inoltre il manovellismo funziona correttamente indipendentemente dalle coordinate assolute del telaio.
(dettagli dell'equazione a 3:51)

p.s.: altri metodi più sbrigativi (ma non più precisi) sono l'Inverse Kinematic System e i Reactors

Da non perdere la correzione per i manovellismi NON CENTRATI nella parte #2
http://www.youtube.com/watch?v=BIgeyax1euw

Category:

Science & Technology

Tags:

• 3ds
• tutorial
• piston
• crank
• rod
• engine
• 3d
• studio
• max
• math
• equations
• mechanics
• manovellismo
• biella
• manovella
• pistone
• equazione
• del
• moto

[crazyarranz]

@streincorp thanks for the reply. i still can't figure out how to get it to B to Rod? so i need to work on the expression to get them to attach?were do you even start to learn how to write expressions?

[streincorp]

@crazyarranz u mean expressions on 3ds? …self taught. But also the 3ds's help > user reference is more useful (I still use the old 3ds 7)

[crazyarranz]

first off great video really helps. so i think i did everything the way you did but im haveing trouble like SundewAU is haveing point B is not attached to rod? My math is realy bad so not sure what you ment in his reply?

[streincorp]

@crazyarranz physically B is attached to the rod but virtually is linked to the chassis, then its movement is ruled by the expression.

Now I'm working on a way to allow B to move up or down the x axis

[Discipol]

@streincorp you madam, are awesome.

[JoeLaFrite007]

Great tut !!!

You are mentioning an easier solution with IK...I'm fighting with this concept since a couple of days without results : do you have a video tutorial to explain how to rig this with IK ?

Again, thanks very much for this "math animation" tutorial that is very well done !!!

[presbarkeep]

very nice video... very nice video indeed. 

[streincorp]

I'm sorry, put "-z" if u want to move the piston up