International Journal of Robotics Research
Biped Locomotion
RHex: A Biologically Inspired Hexapod Runner
Autonomous Robots
Gait Adaptation in a Quadruped Robot
Autonomous Robots
Modeling and Experiments of Untethered Quadrupedal Running with a Bounding Gait: The Scout II Robot
International Journal of Robotics Research
Locomotion Control of a Biped Robot Using Nonlinear Oscillators
Autonomous Robots
Stumbling with optimal phase reset during gait can prevent a humanoid from falling
Biological Cybernetics
Controlling the Walking Period of a Pneumatic Muscle Walker
International Journal of Robotics Research
Adaptive Dynamic Walking of a Quadruped Robot on Natural Ground Based on Biological Concepts
International Journal of Robotics Research
Adaptive behavior in turning of an oscillator-driven biped robot
Autonomous Robots
Biped robot design powered by antagonistic pneumatic actuators for multi-modal locomotion
Robotics and Autonomous Systems
How to keep from falling forward: elementary swing leg action for passive dynamic walkers
IEEE Transactions on Robotics
IEEE Transactions on Robotics
Virtual gravity and coupling control for robotic gait synthesis
IEEE Transactions on Systems, Man, and Cybernetics, Part A: Systems and Humans
A bio-inspired approach for online trajectory generation of industrial robots
Adaptive Behavior - Animals, Animats, Software Agents, Robots, Adaptive Systems
Fuzzy SVM learning control system considering time properties of biped walking samples
Engineering Applications of Artificial Intelligence
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We previously developed a locomotion control system for a biped robot using nonlinear oscillators and verified the performance of this system in order to establish adaptive walking through the interactions among the robot dynamics, the oscillator dynamics, and the environment. In order to clarify these mechanisms, we investigate the stability characteristics of walking using a five-link planar biped robot with a torso and knee joints that has an internal oscillator with a stable limit cycle to generate the joint motions. Herein we conduct numerical simulations and a stability analysis, where we analytically obtain approximate periodic solutions and examine local stability using a Poincaré map. These analyses reveal (1) stability characteristics due to locomotion speed, torso, and knee motion, (2) stability improvement due to the modulation of oscillator states based on phase resetting using foot-contact information, and (3) the optimal parameter in the oscillator dynamics for adequately exploiting the interactions among the robot dynamics, the oscillator dynamics, and the environment in order to increase walking stability. The results of the present study demonstrate the advantage and usefulness of locomotion control using oscillators through mutual interactions.