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Robotique Modélisation et commande des robots manipulateurs - AVR

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Tansformation rigide<br />

Transformation rigide paramétrée :<br />

⎛<br />

⎞ ⎛<br />

⎞ ⎛<br />

⎞ ⎛<br />

⎞<br />

1 0 0 0 1 0 0 a i−1 cos θ i − sin θ i 0 0 1 0 0 0<br />

T i−1, i = ⎜0 cos α i−1 − sin α i−1 0<br />

⎟ ⎜0 1 0 0<br />

⎟ ⎜ sin θ i cos θ i 0 0<br />

⎟ ⎜0 1 0 0<br />

⎟<br />

⎝0 sin α i−1 cos α i−1 0⎠<br />

⎝0 0 1 0 ⎠ ⎝ 0 0 1 0⎠<br />

⎝0 0 1 r i<br />

⎠<br />

0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1<br />

} {{ } } {{ } } {{ } } {{ }<br />

R(x i−1 , α i−1 )<br />

translation de a i−1 x i−1<br />

R(z i , θ i )<br />

translation de r i z i<br />

qui prend la forme :<br />

T i−1, i =<br />

( )<br />

Ri−1, i p i−1, i<br />

0 1<br />

où R i−1, i représente la rotation entre les repères R i−1 <strong>et</strong> R i <strong>et</strong><br />

p i−1, i la translation entre ces mêmes repères.

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