Comparative Analysis of PID and Sliding Mode Control for a 3-DoF RRR Robot Arm

Öz

This study presents a comparative analysis of Proportional-Integral-Derivative (PID) and Sliding Mode Control (SMC) methods applied to a custom-designed and 3D-printed 3-Degree-of-Freedom (3-DoF) Revolute-Revolute-Revolute (RRR) robotic manipulator. A central contribution of this work is the development of a dual-environment validation framework that integrates ROS Noetic with the Gazebo simulation platform, enabling seamless testing of controllers in both virtual and physical settings. This framework provides a practical pathway for bridging the gap between simulation-based evaluations and real-world experimentation, an aspect that remains underexplored in existing studies. The performance of both controllers is assessed through joint position errors, trajectory tracking accuracy, and torque demands for a cubic trajectory application. Experimental results show that while both controllers achieve satisfactory performance, SMC demonstrates superior trajectory tracking, with consistently lower Root Mean Square (RMS) errors across all joints. This improvement, however, is accompanied by slightly higher torque requirements compared to PID, highlighting the trade-off between enhanced accuracy and increased actuator effort. By combining a low-cost robotic platform with a reproducible dual-environment methodology, this study not only offers insights into the practical strengths and limitations of model-free PID and SMC but also establishes a framework that can inform future research and industrial applications.

Anahtar Kelimeler

• Sliding Mode Control
• PID Control
• Robot Arm
• Trajectory Tracking
• Low-cost

Kaynakça

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