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Related Experiment Video

Updated: Mar 10, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Published on: August 30, 2016

Stable bipedal walking with a swing-leg protraction strategy.

Pranav A Bhounsule¹, Ali Zamani¹

¹Department of Mechanical Engineering, University of Texas San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.

Journal of Biomechanics

|December 13, 2016

Summary

Stable walking can be achieved through both swing-leg retraction and protraction. This study reveals that the optimal strategy depends on factors like slope, speed, and control adjustments, impacting robotic and human locomotion.

Keywords:

Dead-beat control Locomotion Poincaré map Swing-leg retraction Walking stability

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Area of Science:

Biomechanics
Robotics
Control Theory

Background:

Bipedal locomotion relies on swing-leg motion (protraction/retraction) for stability.
Previous research indicated swing-leg retraction as a primary strategy for stable walking.

Purpose of the Study:

To investigate if swing-leg protraction can also achieve stable walking.
To identify the conditions and mechanisms governing the choice between protraction and retraction strategies.

Main Methods:

Utilized a 2D passive dynamic walking model with an inter-leg actuator.
Implemented a one-step dead-beat control to correct velocity perturbations at mid-stance.
Analyzed foot placement strategies for returning to a limit cycle in a single step.

Main Results:

Demonstrated that swing-leg protraction can lead to stable walking, particularly at shallow slopes.
Observed swing-leg retraction at steep slopes.
Found that increased limit cycle speed expands the region for swing-leg protraction.

Conclusions:

The choice between swing-leg protraction and retraction is influenced by walker speed and step length adjustments.
Stable walking strategies are contingent on model parameters, terrain, and stability metrics.
Findings have implications for designing controllers for robots, exoskeletons, prosthetics, and understanding human gait stability.