Navigation of Apple Tree Pruning Robot Based on Improved RRT-Connect Algorithm

Pruning branches of apple trees is a labor-intensive task. Pruning robots can save manpower and reduce costs. A full map of the apple orchard with collision-free paths, which is navigation planning, is essential. To improve the navigation efficiency of the apple tree pruning robot, an improved RRT-C...

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Bibliographic Details
Published in:Agriculture (Basel) 2023-08, Vol.13 (8), p.1495
Main Authors: Li, Yechen, Ma, Shaochun
Format: Article
Language:English
Subjects:
Adaptability
Algorithms
apple orchard
Apples
Automation
Branches
Collision avoidance
Curves
Efficiency
Energy consumption
Farm machinery
Fruit trees
Fruits
goal-biased strategy
Manpower
Navigation
Nodes
Orchards
Path planning
Planning
Protection and preservation
pruning robot
Redundancy
Robots
RRT-Connect
Smoothness
Trees
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Summary:Pruning branches of apple trees is a labor-intensive task. Pruning robots can save manpower and reduce costs. A full map of the apple orchard with collision-free paths, which is navigation planning, is essential. To improve the navigation efficiency of the apple tree pruning robot, an improved RRT-Connect algorithm was proposed. Firstly, to address the disadvantage of randomness in the expansion of the RRT-Connect algorithm, a goal-biased strategy was introduced. Secondly, to shorten the path length, the mechanism of the nearest node selection was optimized. Finally, the path was optimized where path redundancy nodes were removed, and Bezier curves were used to deal with path sharp nodes to further reduce the path length and improve the path smoothness. The experimental results of apple orchard navigation show that the improved algorithm proposed in this paper can cover the whole apple orchard, and the path length is 32% shorter than that of the RRT-Connect algorithm. The overall navigation time is 35% shorter than that of the RRT-Connect algorithm. This shows that the improved algorithm has better adaptability and planning efficiency in the apple orchard environment. This will contribute to the automation of orchard operations and provide valuable references for future research on orchard path planning.
ISSN:2077-0472
2077-0472
DOI:10.3390/agriculture13081495