Active reeling and steering control of an eversion/vine robot
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Solution Overview
Problem
Existing vine robots face limitations in length due to internal friction, body buckling during retraction, and constant curvature steering, which restrict their ability to navigate tortuous paths and access complex workspaces.
Innovation Solution
A soft vine robot with a reeling mechanism controlled by a reeling motor and steering mechanism, allowing active control over eversion and inversion, and equipped with a steering-reeling mechanism (SRM) that enables tip reeling and multiple steering points, reducing friction and enabling flexible growth direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive reeling systems are used, then device complexity is reduced, but control precision and adaptability deteriorate
Solution Approach 1:
The patent implements active reeling control with sensors that detect vine robot position and reel position, feeding this information back to a controller that adjusts reel rotation accordingly. This feedback mechanism enables precise control of the vine robot's movement along the guide wire, resolving the contradiction between simple passive systems and precise active control.
Solution Approach 2:
The vine robot autonomously controls its own reeling operation through integrated sensors and actuators. The robot's controller automatically adjusts the reel based on detected position information, eliminating the need for complex external control systems while maintaining high precision control.
2Device complexity
If fixed reel rotation speed is used, then control system simplicity is improved, but adaptability to varying terrain deteriorates
Solution Approach 1:
The patent employs variable rotation speed control where the reel's rotation speed dynamically adjusts based on terrain conditions and vine robot position. The controller modifies rotation commands in real-time, enabling the system to adapt to varying terrain while maintaining manageable control complexity through automated adjustment.
3Stability of the object's composition
If vine robot weight is increased for better stability, then stability improves, but energy consumption and difficulty of maneuvering worsen
Solution Approach 1:
The patent utilizes the guide wire as a counterweight support system. The vine robot is suspended on and propelled along the guide wire, which bears the robot's weight. This eliminates the need for the robot to generate excessive thrust for stability, reducing energy consumption while maintaining stable operation through the guide wire's mechanical support.
4Manufacturing precision
If complex steering control is implemented, then steering precision improves, but device complexity and computational requirements worsen
Solution Approach 1:
The patent implements steering control with sensors that detect vine robot orientation and position, feeding this data back to a controller that adjusts steering actuator commands. This feedback loop enables precise steering control while managing computational complexity through automated control algorithms.
Solution Approach 2:
The vine robot's steering system autonomously adjusts its orientation based on detected position and navigation requirements. The integrated controller automatically processes navigation data and actuates steering mechanisms, achieving precise steering without requiring complex external control systems.
Data Source
Figure 1A~1C
Figure 2A~2G
Figure 3
AI summary
A soft vine robot includes a main body configured as a tube inverted back inside itself to define a pressure channel, such that when the channel is pressurized, the main body everts, and inverted material of the main body everts and passes out of a tip at a distal end of the main body. A reeling mechanism is controlled by a reeling motor, the reeling mechanism being within the tube and being configured to actively feed the inverted material to provide or assist eversion and to actively retract extended material of the main body back. Control and communications electronics control the reeling motor. T reeling mechanism can include a steering mechanism with a bending axis controlled by a steering motor. By actively supplying eversion or inversion forces in the robot body, the soft vine robot can grow with reduced pressure compared to base reeled robots.