リー群におけるナビゲーションベクトル場の距離関数の効率的計算
Efficient Computation of Distance Functions for Navigation Vector Fields in Lie Groups
ロボット制御で使われるベクトル場法において、リー群上の曲線と点との距離計算を高速化する手法を提案。多項式の根を求める問題に帰着させ、計算時間を大幅に削減した。
詳しい要約
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著者: Vinicius M. Gonçalves, João Baião, Felipe Bartelt, Douglas G. Macharet, Gustavo M. Freitas, Héctor Azpúrua, Luciano C. A. Pimenta
分類: cs.RO, cs.CG
原文アブストラクト
Vector-field-based methods are widely used for robot control and are often applied to the path-tracking problem. Some vector field approaches require repeatedly computing the distance between the robot configuration and the curve, as well as the corresponding closest point. Recently, vector fields have been extended to Lie Groups. In this case, this computation can be expensive, especially when performed at high control frequencies on embedded platforms. This paper proposes a method for efficiently computing the distance between a point and a curve represented as what is called a G-polynomial curve, which is a curve representation that generalizes polynomial curves to matrix Lie groups. The proposed approach exploits the structure of these curves to reduce the problem to a small number of polynomial root-finding computations. Simulation results show that the method significantly reduces computation time while maintaining accuracy compared to existing optimization-based approaches. Practical formulas are also provided for the case of the group SE(3), and the method is validated experimentally on a robotic manipulator. The methodology is implemented in a computational package, available online.
