Instantaneous-model Impedance Control Based on Hybrid Position Controller

Since the complementary characteristics of Impedance/Admittance Control and the low-controllability in singular configuration, this kind of compliant method is less likely to be uniformly used in diversified-tasks and unstructured surroundings. For these problems, formula derivation and manipulability ellipsoid are utilized to analyze and describe this dilemma in great detail. Moreover, the instantaneous-model impedance control based on hybrid position controller is proposed at the basis of instantaneous-model impedance control (IMIC), and this control strategy, apart from overcoming the plight of Impedance/Admittance control, can also remain relatively well controllability in singularities of manipulator so as to achieving the precise tracking of position as well as impedance behavior and dynamic contact-stability. Simulation experiment on 2-DOF manipulator is utilized to execute the traditional Impedance/Admittance control and proposed control law to have a comparison in terms of three different indexes. Besides, further physical experiment is conducted by using six-axis force/torque sensor and 6-DOF modular manipulator to verify the feasibility and effectivity of the designed control algorithm