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arXiv 2006.00811cs.RO
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自主挖掘机时变最小扭矩轨迹优化

Time Variable Minimum Torque Trajectory Optimization for Autonomous Excavator

City University of Hong Kong(香港城市大学);University of Hong Kong(香港大学);Baidu Research(百度研究院)

Yajue Yang, Jia Pan, Pinxin Long, Xibin Song, Liangjun Zhang

摘要:

提出了一种考虑土壤-刀具相互作用的最小扭矩时变轨迹优化方法。该方法将挖掘运动的生成归结为一个轨迹优化问题,并考虑了几何、运动学和动力学约束。为了生成具有时间效率的轨迹并提高整体优化效率,提出了一种时变轨迹优化机制,使轨迹上关键点之间的时间间隔服从优化。因此,该方法使用很少的关键点,并减少了优化变量的总数。我们进一步介绍了土壤-工具相互作用力模型,该模型考虑了铲斗的几何形状和土壤的物理性质。仿真实验结果表明,该方法能够生成满足挖掘任务约束条件的可行轨迹,并能适应不同的土壤条件。

英文摘要:

In this paper, we present a minimal torque and time variable trajectory optimization method for autonomous excavator considering the soil-tool interaction. The method formulates the excavation motion generation as a trajectory optimization problem and takes into account geometric, kinematic and dynamics constraints. To generate time-efficient trajectory and improve the overall optimization efficiency, we propose a time variable trajectory optimization mechanism so that the time intervals between the keypoints along the trajectory subject to the optimization. As a result, the method uses few keypoints and reduces the total number of optimization variables. We further introduce a soil-tool interaction force model, which considers the geometric shape of the bucket and the physical properties of the soil. The experimental result on a high fidelity dynamic simulator shows our method can generate feasible trajectories, which satisfy excavation task constraints and are adaptive to different soil conditions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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