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Dynamic Model and Inverse Kinematic Identification of a 3-DOF Manipulator Using RLSPSO.

Josias Batista1, Darielson Souza1, Laurinda Dos Reis1

  • 1Robotics, Automation and Control Research Group (GPAR), Federal University of Ceará, Fortaleza-CE 60455-760, Brazil.

Sensors (Basel, Switzerland)
|January 17, 2020
PubMed
Summary

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This summary is machine-generated.

This study identifies inverse kinematics for a cylindrical manipulator using Least Squares (LS), Recursive Least Square (RLS), and a hybrid RLS-Particle Swarm Optimization (RLSPSO) method. The RLSPSO approach demonstrated superior identification accuracy and improved computational efficiency over traditional methods.

Area of Science:

  • Robotics
  • Control Systems Engineering
  • Computational Intelligence

Background:

  • Accurate inverse kinematics are crucial for precise robot control.
  • Traditional methods like Least Squares (LS) and Recursive Least Square (RLS) have limitations in dynamic parameter identification.
  • Particle Swarm Optimization (PSO) offers a robust optimization framework but can be computationally intensive.

Purpose of the Study:

  • To identify the inverse kinematics of a cylindrical manipulator.
  • To compare the performance of LS, RLS, and a novel hybrid RLS-PSO algorithm (RLSPSO).
  • To enhance the computational efficiency and accuracy of RLS for dynamic parameter identification.

Main Methods:

  • A helical trajectory was used as input for the cylindrical manipulator.
Keywords:
dynamic modelimproved RLS with PSOinverse kinematicsleast Squaresrecursive least squares

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  • Dynamic models were derived using Lagrange equations and motion equations.
  • Inverse kinematics were identified using LS, RLS, and the RLSPSO algorithm.
  • Torque values were calculated based on identified inverse kinematics, joint speeds, and accelerations.
  • Main Results:

    • The RLSPSO algorithm achieved higher identification accuracy compared to LS and PSO.
    • The hybrid RLSPSO method improved upon the computational cost and results of the classic RLS.
    • Comparative analysis included trajectories, speeds, accelerations, torques, computational costs, and Multi-Correlation Coefficient (R²).

    Conclusions:

    • The RLSPSO method provides a significant improvement for inverse kinematics identification in cylindrical manipulators.
    • The proposed hybrid approach effectively balances accuracy and computational efficiency.
    • This work offers a valuable enhancement to existing RLS techniques for complex robotic systems.