Elastomeric Robot Skin Design via Soft Body Simulation
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Solution Overview
Problem
The design of animatronic skin for robotic devices faces challenges in balancing artistic and mechanical demands, as existing manual processes struggle to achieve realistic skin movements while maintaining material durability under repetitive use, leading to stress limitations.
Innovation Solution
A computer-assisted method for designing elastomeric skin systems that uses a soft body simulator to optimize skin shape and thickness, along with Elastomeric Actuation Pieces (EAPs) attached to the mechanical assembly, allowing for non-integral attachment and reduced stress, enabling precise simulation of target shapes and movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual design processes are used for animatronic skin, then artisan skill can be applied to create realistic skin movements, but the design process becomes time-consuming and cannot systematically optimize both artistic and mechanical requirements
Solution Approach 1:
The patent replaces manual artisan design processes with an automated computer-based optimization system that uses finite element analysis and iterative algorithms to determine skin geometry. This substitution eliminates the time-consuming nature of manual design while maintaining or improving precision through systematic computational optimization of skin shape and thickness parameters.
Solution Approach 2:
The design system performs self-optimization by automatically iterating through design parameters, evaluating performance against artistic and mechanical constraints, and adjusting skin geometry without human intervention. The computer-based system serves itself by autonomously completing the full design optimization process from initial parameters to final geometry.
2Adaptability or versatility
If skin is designed to achieve target expressions through large deformations, then artistic requirements are met, but material stress limits are exceeded and durability decreases
Solution Approach 1:
The patent applies different skin thicknesses at different locations to balance expression capability and durability. The optimization system determines variable thickness distributions where thinner regions enable larger deformations for facial expressions while thicker regions maintain structural integrity and withstand repetitive stress, creating local quality variations throughout the skin geometry.
Solution Approach 2:
The system optimizes skin design parameters including thickness, material properties, and geometry to achieve target expressions while staying within stress limits. By changing and adjusting multiple parameters simultaneously through iterative optimization, the system finds configurations that satisfy both artistic expression requirements and mechanical durability constraints.
3Shape
If skin thickness is reduced to achieve more realistic and thinner appearance, then artistic quality improves, but skin becomes more susceptible to stress and mechanical failure
Solution Approach 1:
The optimization system creates non-uniform thickness profiles where the skin is thinner in regions requiring realistic appearance and flexibility while maintaining adequate thickness in load-bearing areas. This local quality variation allows the skin to achieve both aesthetic thinness and mechanical strength through spatially differentiated geometry.
Solution Approach 2:
The patent considers composite material structures and material property optimizations to achieve thin yet strong skin designs. By optimizing material composition and structural geometry together, the system can create thin skin regions that maintain strength through optimized material distribution and structural reinforcement rather than simply increasing thickness.
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
The method effectively reduces stress on the skin material, allowing for accurate and realistic simulations with minimal error in achieving target shapes, enhancing both artistic expression and mechanical durability.
Implementation Method 1
a skin or skin system that is fabricated of flexible (or elastomeric) material to move naturally with the underlying and actuating robotics
Implementation Method 2
Elastomeric Actuation Pieces (EAPs) attached to the mechanical assembly
Data Source
AI summary
A computer-assisted method (and a computer system implementing a design tool and skin fabricated according to these designs) for designing elastomeric skin for robots and robotic devices. The skin design tool is configured to facilitate the optimal navigation of the design space spanned by an animatronic or robotic device skin. The skin design tool includes a soft body simulator that is differentiable with respect to control and design parameters, which enables the skin design tool to provide one or more of the following applications: (1) automated identification of an optimal neutral pose for the skin that minimizes peak stresses when the skin is brought into extreme poses; (2) automated optimization of the skin thickness and shape of a skin to meet a time-varying artistic target; and (3) automated optimization of a skin to achieve a desired behavior if the skin is allowed to slide along an underlying rigid shell.