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This article proposed a novel type of series-parallel lower extremity exoskeleton driven by hydraulic actuators.The determination and distribution of degrees of freedom of the exoskeleton were discussed and joint ranges were determined and optimized.Based on OpenSim, the biological characteristics of human legs during the walking cycle were analyzed and the kinematic and kinetic data were obtained.Based on Kanes method, the inverse dynamic model of the exoskeleton was conducted.The exoskeleton humanoid gaits of level walking, ascent, descent, level walking with different loads and speed were simulated, and the required driving torques and power were obtained.The co-simulation method of ADAMS and MATLAB/SIMULINK was adopted and the switch-type fuzzy-PID/PID controller was designed.A 1-DOF rotation control was simulated by both the switch-type fuzzy-PID/PID controller and a conventional PID controller for comparison.The exoskeleton walking gait was co-simulated by using the intelligent control strategy.These performance analyses provide a basis to the biomechanical design and intelligent control of the exoskeleton.