Flexible-Link Robot Mechanisms for Passive Compliance Tuning
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Solution Overview
Problem
Conventional robot design struggles to create mechanisms with desired embodied intelligence, as existing methods fail to optimally introduce compliance for a user-specified range of interaction-induced forces or displacements, limiting their functionality in uncertain terrains and varied tasks.
Innovation Solution
A computer-implemented method that replaces a subset of rigid links in a robot mechanism with flexible links, optimizing their rest configurations to achieve a desired load-displacement behavior, using a differentiable quasi-static simulator and optimizer to simulate and compare operations, ensuring compliance is introduced in links rather than joints while maintaining a fixed control strategy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rigid links are used in robot mechanisms, then control strategy simplicity is maintained, but adaptability to uncertain terrain and varied tasks is limited
Solution Approach 1:
The patent changes the physical parameter of link rigidity to compliance, allowing the mechanism to adapt to varying terrain and tasks. By introducing flexible links with optimized rest configurations, the robot gains passive adaptability without requiring complex active control strategies, resolving the contradiction between adaptability and control simplicity.
Solution Approach 2:
The compliant mechanism uses its own structural compliance to adapt to uncertain terrain and varied tasks, rather than relying on external sensing and complex control systems. The flexible links passively accommodate variations in load and displacement, enabling the robot to serve itself in adapting to environmental uncertainties.
2Adaptability or versatility
If compliance is introduced in robot mechanisms, then adaptability to range of displacements and forces is improved, but design complexity increases
Solution Approach 1:
The patent introduces compliance locally at specific links rather than throughout the entire mechanism. By selectively replacing individual rigid links with flexible links having optimized rest configurations, the design achieves the desired range of motion and force accommodation without unnecessarily complicating the overall mechanism design.
Solution Approach 2:
The patent performs preliminary optimization of the flexible link rest configurations during the design phase using shape optimization techniques. This preliminary action ensures that the compliant mechanism achieves desired load-displacement behavior without requiring complex real-time control, thereby reducing overall design complexity while maintaining adaptability.
3Reliability
If flexible links replace rigid links, then embodied intelligence and compliance are optimized, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the geometric parameters of flexible links through shape optimization to achieve desired embodied intelligence and load-displacement profiles. By carefully selecting and optimizing these parameters, the design achieves high reliability while maintaining manufacturability through systematic design approaches rather than ad hoc methods.
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 approach enables robot mechanisms to successfully complete complex tasks with uncertainty using simple control strategies, as demonstrated by prototypes adapted for grasping and locomotion, achieving optimal load-displacement profiles and maintaining kinematic behavior without requiring approximation of rigid mechanism kinematics.
Implementation Method 1
a flexible link (136) having a rest configuration and optimized to have a desired load-displacement behavior
Data Source
AI summary
An automated design method, and corresponding computer system for implementing such a method and robot mechanism with an optimized flexible link, that is configured to optimize a desired load-displacement behavior of planar flexible-link mechanisms at expected points of interaction. To implement the new design method, a subset of rigid links of an existing rigid-link robot mechanism are replaced with flexible links, optimizing their rest configurations. The efficacy of the design approach has been proven with two fabricated prototypes of robot mechanisms, with one being adapted for grasping tasks and one being adapted for locomotion tasks.