To address the problems of a single-objective optimization easily falling into local optima and the insufficient coordination between the collision detection and the planning in the obstacle avoidance trajectory planning for dual-arm robots
an adaptive multi-objective particle swarm optimization algorithm was proposed.
Methods
2
The kinematic model was established by using the D-H parameter method. Trajectory planning in the joint space was carried out by means of the quintic polynomial interpolation. Accurate collision detection was achieved by combining the oriented bounding box method
the separating axis theorem
and continuous collision detection. The path length
collision risk
and motion smoothness were taken as optimization objectives. The weights and algorithm parameters were dynamically adjusted
and the final strategy was selected according to the environmental risk classification.
Results
2
The results show that the adaptive multi-objective particle swarm optimization algorithm exhibits the fast convergence speed and the high precision. After optimization
the numbers of changes in the joint angular velocity and the angular acceleration are significantly reduced
and joint impact is obviously decreased. Under both no-load and load conditions
the end-effector position repeatability satisfies the accuracy requirements
and all joint velocities remain within the safe constraint ranges. The proposed algorithm achieves an upgrade from “post-collision replanning” to “active prevention”
effectively reducing joint energy consumption and damage risk
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