Robot Foot Slip Detection Using Inter-Foot Distance Change
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Solution Overview
Problem
Legged robots face challenges in maintaining balance and preventing slips on uneven or rough terrain due to the inability to effectively control ground reaction forces and detect disturbances in their gait.
Innovation Solution
The implementation of a system that uses sensors to determine ground reaction forces, coefficients of friction, and terrain gradients to adjust the orientation of ground reaction forces within a friction cone, allowing the robot to prevent slips and adjust its gait in response to disturbances such as uneven terrain or obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the robot operates on uneven or rough terrain, then the robot's mobility and adaptability are improved, but the robot's stability and balance deteriorate due to inability to control ground reaction forces
Solution Approach 1:
The system continuously monitors ground reaction forces through sensors and uses this feedback to dynamically adjust the orientation of ground reaction forces within the friction cone, maintaining balance stability while operating on varied terrain
Solution Approach 2:
The robot dynamically adjusts the orientation of ground reaction forces in real-time based on terrain conditions and slip detection, transitioning from static force application to dynamic adaptation that maintains stability across different terrain types
2Measurement precision
If the robot increases sensor data processing to detect slips and adjust gait, then the robot's detection precision is improved, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical slip detection mechanisms with sensor-based detection of ground reaction forces and kinematic analysis, achieving high detection precision while reducing mechanical complexity
Solution Approach 2:
The system introduces ground reaction force measurements as an intermediary parameter that links sensor data to slip detection and gait adjustment, simplifying the control architecture by providing a direct physical quantity for analysis
3Reliability
If the robot adjusts ground reaction forces to prevent slips, then the robot's reliability is improved, but the energy consumption increases
Solution Approach 1:
The system performs preliminary detection of slip conditions through ground reaction force monitoring and adjusts ground reaction force orientation before actual slips occur, preventing slips while minimizing energy expenditure compared to reactive correction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables legged robots to maintain balance and stability on varied terrain by controlling ground reaction forces and detecting slips, ensuring efficient movement and preventing gait disturbances.
Implementation Method 1
adjust the orientation of ground reaction forces within a friction cone
Implementation Method 2
determine ground reaction forces, coefficients of friction, and terrain gradients
Data Source
AI summary
An example method may include i) determining a first distance between a pair of feet of a robot at a first time, where the pair of feet is in contact with a ground surface; ii) determining a second distance between the pair of feet of the robot at a second time, where the pair of feet remains in contact with the ground surface from the first time to the second time; iii) comparing a difference between the determined first and second distances to a threshold difference; iv) determining that the difference between determined first and second distances exceeds the threshold difference; and v) based on the determination that the difference between the determined first and second distances exceeds the threshold difference, causing the robot to react.