Abstract
We present a curvature tracking approach for a tractor-trailer wheeled mobile structure (TTWMS), such that the trailer can track a desired trajectory curve accurately. A key motion law related to the curvature functions of trajectory curves is discovered for the first time, in terms of the tractor and the trailer with nonholonomic constraints. Then, based on this key motion law, the target trajectory curve of the trailer is converted to a dynamical tracking target matching the dynamics equation of the TTWMS, so as to transform the original motion task into a common tracking control problem. Finally, LQR optimal control and integral sliding mode control are introduced to design a robust tracking controller for the TTWMS. Simulation results show that the proposed method can make the TTWMS follow a given target trajectory curve accurately, even if the forward and yaw rotational speed errors are divergent.
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Acknowledgements
The authors would like to thank the Associate Editor and all anonymous reviewers for their valuable comments and suggestions which have improved the quality of this paper. This work has received the financial support of NSF of China under Grant (11802065, 11702227), the Science and Technology Program of Guizhou Province ([2018]1047), the fund Project of Key Laboratory of Advanced Manufacturing Technology, Ministry of Education, Guizhou University (KY[2018]478).
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Appendix
Appendix
1.1 Appendix A: Coefficient matrixes of Eq. (13)
where
1.2 Appendix B: Related expressions of Eq. (15)
where
1.3 Appendix C: Another proof of Eq. (24)
As can be seen in Fig. 1, the positional relationship of point Q and P can be expressed as
Taking the first and second derivatives of Eq. (45) with respect to t, respectively, one has
and
By substituting Eqs. (46) and (47) into Eq. (18), the forward speed and yaw rotation speed of point P can be given by
Similar to Eq. (4) of the tractor, and together with (18), the trailer also satisfies the following equations, described by
By substituting Eq. (49) into Eq. (48) results
which is exactly the same as Eq. (24).
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Zhou, Y., Wen, X. & Xu, Q. Precise motion control of tractor-trailer wheeled mobile structures via a newly observed key motion law. Nonlinear Dyn 103, 833–848 (2021). https://doi.org/10.1007/s11071-020-06162-9
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DOI: https://doi.org/10.1007/s11071-020-06162-9