Gravity Compensation and Feedback of Ground Reaction Forces for Biped Balance Control

Area of Science:

• Robotics
• Control Systems
• Mechatronics

Background:

• Biped robots require robust balance control for stability on uneven terrain or under external forces.
• Existing integral feedback methods for ground reaction forces offer stability but suffer from slow response times due to error accumulation delays.

Purpose of the Study:

• To improve the response speed of biped robot balance control.
• To enhance adaptive posture changes for stability under constant external forces or on sloped ground.
• To introduce gravity compensation in a feedforward manner to overcome limitations of integral feedback.

Main Methods:

• Implementing a control method with feedback of ground reaction forces.
• Introducing gravity compensation in a feedforward manner to the existing control system.
• Analyzing the stationary state and stability using dynamic equations.
• Evaluating robustness and response using computer simulations.
• Conducting standing experiments on a slope to validate adaptive behaviors.

Main Results:

• The proposed method enhances adaptive posture changes, ensuring robot stability.
• Feedforward gravity compensation significantly improves response speed compared to integral feedback alone.
• Simulations demonstrate improved robustness and response characteristics.
• Experimental validation confirms adaptive behaviors on sloped surfaces.

Conclusions:

• The integration of feedforward gravity compensation is effective in accelerating the response of biped robot balance control.
• The enhanced control strategy maintains stability and adaptability on challenging terrains and under external disturbances.
• This approach offers a viable solution for achieving faster and more robust bipedal locomotion.