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移動機(jī)器人低能耗最優(yōu)路徑規(guī)劃方法
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國家國際科技合作專項(2014DFR10100)


Energy Optimal Path Planning for Mobile Robots Based on Improved AD* Algorithm
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    摘要:

    在移動機(jī)器人路徑規(guī)劃中需要考慮距離約束和時間約束,同時,為了使機(jī)器人在能量補(bǔ)給不足的情況下更高效地執(zhí)行更多的任務(wù),降低運動過程中的能耗變得尤為重要。兼顧考慮機(jī)器人對降低能耗和路徑規(guī)劃效率兩方面的需求,本文提出了一種基于改進(jìn)AD*(Anytime dynamic A*)算法的移動機(jī)器人低能耗最優(yōu)路徑規(guī)劃方法。首先,通過構(gòu)建機(jī)器人動力學(xué)模型及其在運動過程中的能耗模型,實現(xiàn)對路徑的能耗計算。結(jié)合機(jī)器人運動學(xué)模型,采用基于采樣的模型預(yù)測算法(Sample based model predictive optimization,SBMPO)生成優(yōu)化軌跡簇。然后,改進(jìn)AD*算法,將距離成本和能耗成本融入搜索節(jié)點的評估函數(shù),根據(jù)軌跡簇中的節(jié)點連接關(guān)系和環(huán)境地圖進(jìn)行在線規(guī)劃,以獲得能耗最優(yōu)的路徑。最后,通過設(shè)計仿真測試場景,將所提出的能耗最優(yōu)路徑規(guī)劃方法與距離最優(yōu)規(guī)劃方法進(jìn)行規(guī)劃結(jié)果對比,驗證了算法的有效性。

    Abstract:

    Path planning with distance and time constraints is often required for mobile robots. Meanwhile, reducing energy consumption is much more important in order to make robot perform more tasks and more efficiently with limit energy supply. Hence, it is important to minimize the energy consumption of mobile robots deployed in real world missions. One of the ways that can be accomplished is to choose the robot’s motion to minimize the mechanical and electrical energy usage required by the robot’s motion. However, this method will cause the robot accelerate or decelerate frequently. Taking into account the demand for reducing energy consumption and improving the efficiency of path planning, an energy optimal path planning method was proposed based on AD* algorithm. The energy consumption was reduced with the proposed energy optimal path planning method by taking into account the distance and time constraints. Firstly, the energy consumption of path was calculated by using the dynamic model and power model of the robot. The samplebased model predictive optimization algorithm was used to generate the optimal trajectory cluster based on the kinematics model of robot. Then, an energy optimal path planning method was proposed based on AD* search algorithm by integrating the energy consumption into the node’s evaluation function. Energy optimal path planning was carried out online to find the optimal energy consumption path, according to the connection relationship of nodes and environment map. Finally, the effectiveness of the proposed energy optimal path plannign method was confirmed by comparing the simulation results with distance optimal path planning method. The proposed energy optimal path planning method can be deployed on the mobile robot platform which served in outdoor terrain environments for decreasing energy consumption.

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張浩杰,蘇治寶,HERNANDEZ D E,蘇 波.移動機(jī)器人低能耗最優(yōu)路徑規(guī)劃方法[J].農(nóng)業(yè)機(jī)械學(xué)報,2018,49(9):19-26. ZHANG Haojie, SU Zhibao, HERNANDEZ D E, SU Bo. Energy Optimal Path Planning for Mobile Robots Based on Improved AD* Algorithm[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(9):19-26.

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  • 收稿日期:2018-05-06
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  • 在線發(fā)布日期: 2018-09-10
  • 出版日期: 2018-09-10
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