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318                                    Autonomous Mobile Robots

                                          15



                                          10



                                         y (m)  5

                                                                              Leading
                                                                              l=1 m
                                           0
                                                                              l=2.5 m
                                                                              l=4 m
                                                                              l=5.5 m
                                          – 5
                                           – 10   0    10    20    30   40    50    60
                                                                x (m)

                                FIGURE 8.8 Vehicle trajectories (x, y) with different values of l.

                                          20
                                                                             l=1 m
                                          18
                                                                             l=2.5 m
                                          16
                                                                             l=4 m
                                          14                                 l=5 m
                                         Tracking error (cm)  12

                                          10
                                          8
                                          6
                                          4

                                          2
                                          0
                                            0   5   10  15  20   25  30  35  40   45  50
                                                              Time (sec)

                                FIGURE 8.9  Tracking errors  ˜z  for different values of l.

                                8.4.1.2 Influence of parameter l
                                We fix parameter p at value 2. Parameter l varies from 1 to 5.5 m. Simula-
                                tion results are shown in Figure 8.8 to Figure 8.12. Figure 8.8 and Figure 8.9




                                 © 2006 by Taylor & Francis Group, LLC



                                FRANKL: “dk6033_c008” — 2006/3/31 — 16:43 — page 318 — #24
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