Recently a method has been developed to decouple the equations of motion for multi-rigid body systems. In this paper, the method is first studied, then the equations of motion for a planar two degree-of-freedom robot with flexible joints are carried out using Lagarange's equations and Kane's equation with congruency transformations. Finally, the results obtained from both methods are throroughl...

This paper presents a novel and improved technique in manual control of flexible systems. Flexible systems, when subject to a rapid movement commanded by a human operator, exhibit severe oscillation, causing low positioning accuracy, high fatigue to the human operator, and unsafe accidents. Input shaping filter was proposed to reduce this oscillation by using the destructive interference princi...

Robotic systems can benefit from the introduction of properly chosen joint elasticity. Besides their robustness against rigid impact, the energy saving capabilities may increase the system dynamics. In this paper, a method applicable for robots with serial elastic joints is presented, which embodies a desired oscillatory behavior into the hardware and thereby leads to improved performance. This...

This paper presents a comparative study of four control strategies for a flexible joint space manipulator. The considered control strategies consist in the classical Slotine and Li algorithm, a simple proportional derivative controller, a singular perturbation-based controller and a nonlinear backstepping controller. All control methodologies are assessed in numerical simulations for endpoint p...

T h i s work is a computer simulation of the control of flexi ble robot arm. The dynamic equations for a single-link flexible robot arm have been derived rigorously. Th is arm has two degrees of freedom in rotation and one in translation so that the workspdce i s three-dimensional. The payload is simulated by attaching additional mass to the arm at a specified location. The governing equations ...

In this paper, two nonlinear robust controllers for a flexible-link manipulator are presented. These controllers are derived using both sliding mode techniques and nonlinear H∞ control methodologies. The effectiveness of the presented control law are shown by simulations and experiments carried out with the flexible robot arm, an experimental setup available in our Institute Laboratory. The pro...

This paper considers improving the tip regulation performance of a joint-PD controlled single-link flexible manipulator by introducing nonlinear strain feedback. The controller is developed by applying Lyapunov’s direct method. The stability of the closed-loop system is theoretically proven based on the partial differential equations (PDE’s) which govern the motion of the flexible robot, instea...

In this paper we show the identification of the dynamic parameters of a redundant flexible joint robot with a flexible bearing in the first joint. The bearing leads to distortions of the link velocities measured by gyroscopes. The bearing flexibility is not modeled explicitly, resulting in a very simple model. For the joint positions encoders are used. We show how to pack the calibration proble...

Inverse flexible dynamics control (IFDC) and fuzzy logic system adaptive control (FLSAC) strategies are used to track the end effector of a flexible space robot with sensors collocated at the joints, noncollocated at the end effector and 0.5m from the elbow joint on link 2. Collocated joint sensors satisfy hyperstability conditions but fail to capture nonminimum phase (NMP) response that genera...