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Published Online:2022-06,
Published:15 June 2022
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Qiang ZHANG, Wen WEN, Xiaodong ZHOU, et al. Research on the manipulator intelligent trajectory planning method based on the improved TD3 algorithm[J]. Chinese journal of intelligent science and technology, 2022, 4(2): 223-232.
Qiang ZHANG, Wen WEN, Xiaodong ZHOU, et al. Research on the manipulator intelligent trajectory planning method based on the improved TD3 algorithm[J]. Chinese journal of intelligent science and technology, 2022, 4(2): 223-232. DOI: 10.11959/j.issn.2096-6652.202225.
针对某卫星搭载的4自由度机械臂轨迹规划问题,提出了一种基于改进的双延迟深度确定性策略梯度(TD3)算法的智能规划方法。该方法采用分阶段训练策略,在预训练阶段,采用了目标位置引导联合TD3算法进行轨迹优化的混合规划策略,训练结束后规划算法能够在机械臂关节空间对任意起点、终点进行速度轨迹的自主规划。这种目标引导机制减少了训练时不必要的探索,在一定程度上解决了高维动作空间中学习效率低下的问题。在二次训练阶段,首先通过示教获得一条无碰撞的安全参考轨迹,然后在训练过程中不断对这条轨迹进行模仿,使得最终算法输出的轨迹具备避障能力。
An intelligent trajectory planning and obstacle avoidance method based on the improved twin delayed deep deterministic policy gradient algorithm (TD3) was proposed to solve the trajectory planning problem for a 4-DOF manipulator mounted on a satellite.The training strategy had 2 periods.In the pre-training stage
the target position was always guided combining with the output of the strategy network to optimize the trajectory.After the pre-training
the algorithm can autonomously output the velocity trajectory while the initial position and the target were specified randomly in the joint space of the manipulator.This target-guided mechanism decreased the unnecessary explorations and improved the learning efficiency in high dimensional action space.In the second training stage
a collision-free safety reference trajectory was firstly obtained by demonstration
and then this trajectory was constantly learned during the training process until the final output trajectory has the ability to avoid obstacles.
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