Active Vine Robot Reeling and Steering for Tortuous Paths
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Solution Overview
Problem
Vine robots face limitations in length due to internal friction when navigating tortuous paths, body buckling during retraction, and constant curvature steering, which restricts their pose and object approach angles in a workspace.
Innovation Solution
The introduction of an active reeling mechanism with a steering motor allows the vine robot to reel from the tip, using a hybrid soft-rigid configuration with a bending actuator for steering and retraction, reducing friction and pressure requirements, and enabling navigation through complex paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If vine robots extend by everting material through internal fluid pressure alone, then the device remains fully soft and simple in structure, but internal friction limits the length achievable in tortuous paths
Solution Approach 1:
A reeling mechanism acts as an intermediary component between the material storage reel and the everting body. This mechanism actively pulls material through the body using rollers or a spool, mediating the material transport process to overcome internal friction that would otherwise limit extension length in tortuous paths
Solution Approach 2:
The patent replaces the purely pneumatic eversion mechanism with a hybrid system that incorporates active mechanical reeling. The reeling mechanism uses motors to drive rollers or a spool that mechanically pull material through the body, substituting passive fluid pressure with active mechanical assistance to reduce the energy loss to friction
2Ease of operation
If material is re-spooled at the base during retraction, then the robot can retract, but body buckling can prevent successful retraction
Solution Approach 1:
The retraction process is segmented into coordinated actions: the reeling mechanism actively pulls material through while steering mechanisms maintain body curvature control. This segmentation of functions prevents uncontrolled buckling that would occur with passive base reeling alone
Solution Approach 2:
The control system uses feedback to coordinate the reeling mechanism with steering adjustments during retraction. By monitoring body configuration and adjusting steering accordingly, the system prevents buckling instabilities that would otherwise prevent successful retraction
3Adaptability or versatility
If vine robots use selective lengthening or shortening of one side for steering, then the device remains fully soft, but constant curvature steering limits poses and object approach angles
Solution Approach 1:
The patent implements dynamic steering by allowing the reeling mechanism to operate at multiple positions along the body rather than being fixed at the base. This dynamic repositioning capability enables variable curvature steering and diverse poses while maintaining the fully soft construction
Solution Approach 2:
The reeling mechanism serves multiple functions: it enables both extension and retraction, provides steering capability through positional variation, and can operate at different locations along the body. This multi-functionality achieves versatile steering without proportionally increasing overall device complexity
4Length of moving object
If active reeling mechanism with motors is added to the vine robot, then friction is reduced and retraction is improved, but the device transitions from fully soft to hybrid soft-rigid configuration
Solution Approach 1:
The patent maintains the outer body as a flexible thin-walled membrane that everts during extension. This flexible shell approach preserves the soft robot characteristics while accommodating the rigid reeling mechanism internally, reducing the overall impact of the hybrid configuration
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 enhances the vine robot's ability to explore tortuous environments by increasing reach, allowing retraction at any length, reducing pressure needed for growth, and expanding the workspace with flexible steering capabilities.
Implementation Method 1
when the channel is pressurized, the main body everts, and inverted material of the main body everts and passes out of a tip
Data Source
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.