Trajectory and Vibration Control of a Single-link Flexible Joint Manipulator Using a Distributed Higher Order Differential Feedback Controller

[+] Author and Article Information
John Terhile Agee

Discipline of Electrical Engineering, University of KwaZulu-Natal, 4001 Durban. South Africa

Zafer Bingül

Department of Mechatronics Engineering, Kocaeli University, Kocaeli, Turkey

Selcuk Kizir

Department of Mechatronics Engineering, Kocaeli University, Kocaeli, Turkey

1Corresponding author.

ASME doi:10.1115/1.4035873 History: Received July 27, 2016; Revised January 19, 2017


The trajectory tracking in the flexible-joint manipulator (FJM) system becomes complicated since the flexibility of the joint of the FJM superimposes vibrations and non-minimum phase characteristics. In this paper, a distributed higher-order differential feedback controller (DHODFC) using the link and joint position measurement was developed to reduce joint vibration in step input response and to improve tracking behavior in reference trajectory tracking control. As a contrast to the classical HOD, the dynamics of the joint and link are considered separately in DHODFC. In order to validate performance of the DHODFC, step input, trajectory tracking and disturbance experiments are conducted. In order to illustrate the differences between classical HOD and DHODFC, the performance of these controllers are compared based on tracking errors and control signal energy in the tracking experiments and fundamental dynamic characteristics in the step response experiments. DHODFC produces better tracking errors with almost same control signal energy in the reference tracking experiments and a faster settling time, less or no overshoot and higher robustness in the step input experiments. Dynamic behavior of DHODFC is examined in continuous and discontinues inputs. The experimental results showed that the DHOFC is successful in the elimination of the non-minimum phase dynamics, reducing overshoots in the tracking of such discontinuous input trajectories as step and square waveforms and the rapid damping of joint vibrations.

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