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基于位姿狀態(tài)的全向運行型AGV路徑跟蹤優(yōu)化控制方法
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江蘇省重點研發(fā)計劃項目(BE2016004-3)和中央高?;究蒲袠I(yè)務(wù)費專項資金項目(NS2017028)


Optimal Path Tracking Control Method of Omni-directional Mobile AGV Based on Pose State
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    摘要:

    自動導(dǎo)航車自主移動的關(guān)鍵是精準(zhǔn)的路徑跟蹤,針對Mecanum輪全方位移動AGV的路徑跟蹤,,提出了一種基于位姿狀態(tài)和有限控制步數(shù)的路徑跟蹤優(yōu)化控制方法,。在系統(tǒng)約束條件下,,通過建立系統(tǒng)的運動學(xué)模型,,將連續(xù)的系統(tǒng)離散化,。在目標(biāo)函數(shù)中只包含速度控制量,,同時通過最小化目標(biāo)函數(shù),,得到系統(tǒng)控制量的控制序列,,從而避免了最優(yōu)控制的加權(quán)矩陣選擇難的問題。此外,,有限步的控制序列也有利于實時嵌入式控制器的滾動控制,。仿真和實驗表明,對于不同速度,,該算法均能快速,、同步、穩(wěn)定地消除位姿偏差,,且計算量小,、方便。

    Abstract:

    An optimal control method based on pose state and limited steps of control sequences was presented for path tracking of an omni-directional mobile automated guided vehicles (AGV), as the key of automated guided vehicle autonomous movement was precise path tracking. Firstly, under the system constraints, the continuous system was discretized by establishing the kinematic model and analyzing the kinematic model of the system. Secondly, by selecting the two order integral function as the objective function of the optimal control, a selection of weighted matrix for optimal control was avoided when an objective function only included one item of speed control and a control sequence of the system control quantity was obtained by minimizing objective function. Meanwhile, the limited steps of control sequences were also beneficial to the rolling control of real time embedded controller. In addition, the control efficiency of the system can be improved by reducing the number of control steps under the condition that the control cycle was determined and the control performance was satisfied. Finally, simulation and experiment results showed that when the system was stable, the angle error of the path tracking was within 2°, the distance error was less than 2 mm, and the control time was 0.8~1.2s. Thus the algorithm can eliminate pose error quickly, synchronously and stably for different speeds, and the computation was small and convenient.

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錢曉明,朱立群,樓佩煌,張滬松.基于位姿狀態(tài)的全向運行型AGV路徑跟蹤優(yōu)化控制方法[J].農(nóng)業(yè)機械學(xué)報,2018,49(4):20-26. QIAN Xiaoming, ZHU Liqun, LOU Peihuang, ZHANG Husong. Optimal Path Tracking Control Method of Omni-directional Mobile AGV Based on Pose State[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(4):20-26.

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  • 收稿日期:2017-10-24
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  • 在線發(fā)布日期: 2018-04-10
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