:   ..
:  
:  118
:  
:  2025
:   .. // . - 2025. - . 118. - .362-385.
:   , , ,
(.):  reference trajectories, dynamic smoothing and differentiation, sigmoidal correction, adaptive setting
:   - , . (.. , ) S- , , . , . . , , . , - . ,, () , . . .
(.):  In trajectory control of mechanical plants, it is important to ensure the realizability of reference trajectories their smoothness and fulfillment of the derivatives of their radius vectors to the design constraints on velocity, acceleration, and jerk. To smooth the reference trajectories (i.e., the initial polygonal chain that defines the approximate path along the reference waypoints), a dynamic generator with S-shaped corrective actions is considered. Their gains are set once at the design stage for the worst case, when the rate of change of the reference trajectory is assumed to be constant and maximum everywhere, considering the specified constraints. Constant gains determine the maximum tracking error of the reference trajectory by the generator's output variables, which is a measure of the smoothing of its corners and joints. However, sufficiently smooth or straight parts of the reference trajectory will also be reproduced with a constant error. This reduces the navigation accuracy of the mobile robot, which will track the realizable trajectory generated by the dynamic generator as a result of smoothing the reference trajectory. To overcome this problem, a dynamic generator with a mechanism for varying the gains along the state vector is proposed, whose elements are the derivatives of the radius vector of the reference trajectory of the corresponding orders. The reserve for increasing the gains and, consequently, reducing the tracking (approximation) error of the reference trajectory occurs in parts where the rate of change of the reference trajectory is less than the maximum possible. The effect of various gains on the dynamics of approximation error reduction has been researched. The results of computational experiments with three- and four-block dynamic generators are presented.

PDF

: 74, : 31, : 9.


© 2007.