Kinetic Wire Mechanism Design for Elastic CNC-Bent Motion
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Solution Overview
Problem
There is a lack of automated or computer-assisted design tools for creating kinetic wire mechanisms that can be efficiently fabricated using CNC bending machines, which are compliant and can bend into multiple positions without plastic deformation, limiting the ability to design and manufacture complex animated characters or structures.
Innovation Solution
A computational technique that takes a skeletal animation as input and generates a cable-driven, compliant wire structure by identifying regions for spring-like entities with varying stiffness, optimizing their placement and parameters to match user-defined keyframes, and using a three-stage optimization process to ensure fabricability and avoid inelastic deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manual bending and assembly methods are used to create rigid wire components jointed together, then the wire character can be created with simple tools, but the design and fabrication process is very time consuming and difficult to repeat
Solution Approach 1:
The patent replaces manual mechanical bending and assembly operations with a computational design system that generates fabrication instructions for automated bending machines. The system substitutes human skill and experience with computer algorithms that automatically design wire mechanisms and generate CNC toolpaths, dramatically increasing fabrication speed and repeatability while reducing design complexity for users.
Solution Approach 2:
The patent transforms the design process from manual parameter specification to automated parameter optimization. The computational system automatically determines wire stiffness, bend radii, joint positions, and component dimensions based on desired character geometry and motion requirements, eliminating the need for manual parameter tuning and enabling rapid iteration of design variations.
2Strength
If industrial-grade CNC bending machines are used to manufacture elastic springs, then large elastic deformations can be achieved within small volume, but the devices are expensive and mainly used for conventional spring manufacturing
Solution Approach 1:
The patent extends the application of CNC bending machines from conventional spring manufacturing to kinetic wire mechanism fabrication. The system enables these expensive industrial devices to perform dual functions: traditional elastic spring production and creation of compliant wire characters with controlled stiffness regions. This multi-functionality justifies the investment by opening new application domains for the equipment.
Solution Approach 2:
The patent applies local quality by creating wire mechanisms with spatially varying stiffness properties. Different regions of the wire are designed with different bend radii and curvature profiles to achieve specific functional requirements at different locations, enabling complex motions while maintaining overall structural integrity and elastic deformation capabilities.
3Ease of manufacture
If affordable desktop bending devices are used to build lightweight structures, then broader audience can fabricate custom shapes quickly, but traditional kinetic wire assemblies are ill-suited for automated fabrication on these devices
Solution Approach 1:
The patent replaces manual design and assembly processes with automated computational design tools that generate fabrication instructions specifically tailored for desktop bending devices. The system substitutes human expertise with algorithms that automatically adapt designs to the capabilities and constraints of affordable bending equipment, enabling users without specialized skills to create complex kinetic wire mechanisms.
Solution Approach 2:
The patent segments the wire mechanism into discrete components that can be independently fabricated and assembled by desktop bending devices. The computational system divides the continuous wire into manageable segments with specific bend patterns, making the fabrication process suitable for affordable equipment with limited working envelopes and bend capabilities, while maintaining overall design flexibility.
4Reliability
If compliant wire structures with spring-like entities are designed to achieve large localized deformations, then the mechanisms can bend to multiple positions without plastic deformation, but the design process lacks automated tools and is difficult to optimize
Solution Approach 1:
The patent replaces manual iterative design processes with automated computational optimization algorithms. The system substitutes trial-and-error manual adjustment with computer-based optimization that automatically determines optimal spring-like entity placements, stiffness values, and wire geometry to achieve reliable elastic deformation while minimizing design complexity for the user.
Solution Approach 2:
The patent implements feedback through simulation and optimization loops that evaluate design performance against target motions and constraints. The computational system simulates the behavior of wire mechanisms with spring-like entities, compares simulated performance to desired outcomes, and automatically adjusts design parameters to improve elastic deformation reliability and match target poses accurately.
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
Enables the rapid design and fabrication of kinetic wire mechanisms with complex spatial motion and large deformations, matching target poses accurately while ensuring the mechanisms remain elastic and avoid plastic deformation, thus overcoming the limitations of traditional manual design and fabrication methods.
Implementation Method 1
elastically deforming wire mechanisms have many desirable properties including being inexpensive and lightweight while also providing excellent strength and fatigue properties. Unique to kinetic wire mechanisms is that stress can be relieved by locally elongating the wire such as by winding or bending a shape with a particular homogenized stiffness.
Implementation Method 2
shaping the mechanism's body (i.e., the wire) into functional spring-like entities at a discrete set of locations along the length of the mechanism's body
Data Source
AI summary
Methods and corresponding systems that are useful in design and fabrication of kinetic wire mechanisms or characters. The method includes a computational technique for the design of kinetic wire mechanisms tailored for fabrication on consumer-grade hardware such as a desktop CNC bending device. The method takes as input a skeletal animation of the mechanism to be fabricated and estimates, from the skeletal animation, a cable-driven and compliant wire structure, which matches user-selected keyframes. To enable localized deformations, the technique involves shaping the mechanism's body (i.e., the wire) into functional spring-like entities at a set of locations along the length of the mechanism's body. The method involves determining where on the wire body to place these spring-like entities, determining which types or configurations of spring-like entities should be placed at each of these locations, and optimizing parameters of each user-selected spring-like entity for use at the locations on the wire mechanism.