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Underwater Robots - Gianluca Antonelli.pdf

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66 3. Dynamic Control of 6-DOF AUVs<br />

Figure 3.6 and 3.7 report the position, orientation and control effort for<br />

controller C .Itcan be observed astrong coupling during the commanded<br />

yaw rotation caused bythe controller itself. This can be further appreciated<br />

in Figure 3.8 where the projection of the vehicle position on the xy plane<br />

during the rotation compared with controller A is given.<br />

position [m]<br />

orientation [deg]<br />

1<br />

0.8<br />

0.6<br />

0.4<br />

0.2<br />

0<br />

−0.2<br />

100<br />

80<br />

60<br />

40<br />

20<br />

0<br />

y<br />

x<br />

z<br />

0 50 100 150 200 250 300 350 400<br />

φ<br />

θ<br />

−20<br />

0 50 100 150 200 250 300 350 400<br />

time [s]<br />

Fig. 3.6. Simulated position and orientation for the reduced controller C<br />

ψ

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