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mise sous forme matricielle

English translation: expressed as a matrix


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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
French term or phrase:mise sous forme matricielle
English translation:expressed as a matrix
Entered by: Alan Douglas
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08:36 Nov 7, 2011
French to English translations [PRO]
Tech/Engineering - Mathematics & Statistics / Technologie robotique
French term or phrase: mise sous forme matricielle
From a technical manual for an autonomous programmable mini-robot used for educational purposes.

Context:

Modèle géométrique de la transmission du [robot XXX]
Le modèle géométrique donne la transformation qui permet de passer des vitesses angulaires des roues à la vitesse instantanée du robot. Les explications qui suivent présentent le modèle géométrique du robot XXX (robot différentiel). Cette transformation se passe en 3 étapes :
Calcul de la vitesse du centre des roues ;
Calcul de la vitesse de n'importe quel point du robot ;
A partir des vitesses, calcul de la position.

Légende:
2L : distance entre les roues
r : rayon de la roue
Vd, Vg : vitesse des roues droite et gauche
x, y : position du robot
Psi : orientation du robot

Calcul de la vitesse du centre des roues
Vitesse de la roue droite : V_rd=r.V_d
Vitesse de la roue gauche : V_rg=r.V_g

Vitesse moyenne du centre des roues :
V_moy=(V_rg+V_rd)/2

Calcul de la vitesse de n’importe quel point du robot
Rapprochement la vitesse moyenne du centre des roues *** dans le repère *** (O, X, Y) par décomposition en X et en Y :
V_x=V_moy.cos⁡(Psi)=(r.V_d)/2.cos⁡(Psi)+(r.V_g)/2.cos⁡(Psi)
V_y=V_moy.sin⁡(Psi)=(r.V_d)/2.sin⁡(Psi)+(r.V_g)/2.sin⁡(Psi)

Relation donnant la vitesse angulaire du robot (Avec « Psi » pris dans le sens trigonométrique et « apsi" » la vitesse angulaire du robot) :
〖2.L.a〗_psi=r.V_d-r.V_g

En isolant « apsi » on obtient la relation suivante :
a_psi=(r.V_d-r.V_g)/(2.L)

*** Mise sous forme matricielle *** :
[■(Vx@Vy@a_psi )]=r/2.[■(cos(Psi)&cos(Psi)@sin(Psi)&sin(Psi)@1/L&(-1)/L)].[■(Vd@Vg)]
Alan Douglas
France
Local time: 20:45
expressing this in matrix form
Explanation:
or: expressed as a matrix

It's not quite clear from the limited graphics ability here if what you have following the : is in fact thet actual matrix (in which case my second suggestion might be better), or just the means of getting there (in which case suggestion #1 is probably more suitable)

I've given a low C/L, since I'm afraid I've pretty much forgotten most of my maths now, and so can't claim any real specialist knowledge in this area.
Selected response from:

Tony M
France
Local time: 20:45
Grading comment
Tony, I prefer your alternative "expressed as a matrix" and am going to go with that.
4 KudoZ points were awarded for this answer



Summary of answers provided
1 +8expressing this in matrix form
Tony M
4expressed matricially
kashew


  

Answers


7 mins   confidence: Answerer confidence 1/5Answerer confidence 1/5 peer agreement (net): +8
expressing this in matrix form


Explanation:
or: expressed as a matrix

It's not quite clear from the limited graphics ability here if what you have following the : is in fact thet actual matrix (in which case my second suggestion might be better), or just the means of getting there (in which case suggestion #1 is probably more suitable)

I've given a low C/L, since I'm afraid I've pretty much forgotten most of my maths now, and so can't claim any real specialist knowledge in this area.

Tony M
France
Local time: 20:45
Does not meet criteria
Native speaker of: Native in EnglishEnglish
PRO pts in category: 23
Grading comment
Tony, I prefer your alternative "expressed as a matrix" and am going to go with that.

Peer comments on this answer (and responses from the answerer)
agree  chris collister: Perfectly correct. The matrix is the workhorse of geometric transformations, solutions of linear equations, determination of eigenfrequencies, etc etc.
1 hr
  -> Thanks, Chris!

agree  Terry Richards
1 hr
  -> Thanks, Terry!

agree  Nigel Wheatley
2 hrs
  -> Thanks, Nigel!

agree  Simon Mountifield
2 hrs
  -> Thanks, Simon!

agree  Oliver Walter: Yes, if you hadn't given this answer, I would have!
5 hrs
  -> Thanks, Oliver!

agree  DLyons
8 hrs
  -> Thanks, DL!

agree  rkillings: Or just "In matrix form:".
10 hrs
  -> Thanks, R!

agree  M.A.B.
23 hrs
Login to enter a peer comment (or grade)

1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5
expressed matricially


Explanation:
*

Example sentence(s):
  • 2 x2 = (x′1 + x′2)e2 = −x′1 sinγ + x′2 cosβ. (13). The above can be expressed matricially as. ( x1 x2 ) = ( cosγ − sinβ. − sinγ cosβ )( x′1 x′2 ) . (14). Then ...
kashew
France
Local time: 20:45
Does not meet criteria
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4
Login to enter a peer comment (or grade)




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