Space Lattice Assembly Using Cold-Connected Metal Frameworks
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Solution Overview
Problem
Current methods for manufacturing large-dimension structures in space, such as antenna reflectors and optical mirrors, face challenges including complexity, dimensional constraints, material degradation due to electromagnetic flux and thermal variations, and energy inefficiency, particularly with thermoplastic and metal 3D printing techniques.
Innovation Solution
A method for manufacturing a rigid lattice structure in space using cold-connected metal strip or wire framework elements, which eliminates the need for heat input and reduces energy consumption, deformation, and contamination, while ensuring dimensional stability and electrical conductivity through the use of materials like Invar, titanium, or aluminum-based alloys, and attachment of functional tiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermoplastic materials are used for additive manufacturing in space, then the manufacturing temperature is moderately low (below 300°C), but the electrical conductivity is too low to dissipate ionized particle charges and the structures deform due to thermal expansion
Solution Approach 1:
The patent changes the material parameter from thermoplastic to metal, which fundamentally alters the electrical conductivity and thermal expansion properties. Metal materials provide high electrical conductivity for charge dissipation and low thermal expansion coefficients for dimensional stability, directly resolving the reliability issues while maintaining manageable manufacturing temperatures through cold-connect assembly techniques.
Solution Approach 2:
The patent employs composite construction by assembling multiple metal framework elements together to form the lattice structure. This composite approach allows the use of metal materials with superior electrical and thermal properties while maintaining the benefits of modular assembly in space, achieving both conductivity and dimensional stability.
2Reliability
If metal additive manufacturing is used to manufacture large-dimension structures in space, then electrical conductivity is improved, but heating temperatures must be well above usage temperature and deformation occurs during cooling
Solution Approach 1:
The patent divides the metal structure into separate framework elements that are manufactured independently and then assembled through cold-connect techniques. This segmentation avoids the need to heat entire large-dimension structures to melting temperatures, preventing thermal deformation while maintaining the electrical conductivity benefits of metal materials.
Solution Approach 2:
The patent replaces the thermal field (heating and melting processes) with mechanical field processes for assembly. By using cold-connect techniques such as mechanical fastening or friction stir welding, the structure is assembled without subjecting the metal to extreme temperatures that would cause deformation, thus improving manufacturing precision while maintaining electrical conductivity.
3Length of stationary object
If foldable structures are created on the ground to fit in launcher nose cones, then dimensional constraints are overcome, but the structure becomes more complex to design and produce
Solution Approach 1:
The patent transitions from static foldable structures to dynamic modular assembly. Instead of pre-configuring foldable mechanisms on the ground, the structure is built in space through modular assembly of framework elements, eliminating the need for complex ground-based folding mechanisms while achieving large dimensions.
Solution Approach 2:
The patent moves the manufacturing process from the ground dimension (launcher constraints) to the space dimension (orbital assembly). By assembling the structure in orbit rather than transporting it folded from Earth, the patent eliminates launcher nose cone dimensional constraints without requiring complex foldable designs.
4Reliability
If metal layer coating is applied to thermoplastic structures to increase electrical conductivity and lifespan, then conductivity improves, but contaminants are generated on neighboring optical surfaces
Solution Approach 1:
The patent extracts the metal coating step from the manufacturing process by using solid metal framework elements directly. Instead of depositing metal layers onto thermoplastic structures (which generates contaminants), the patent uses pre-formed metal elements assembled through cold-connect techniques, eliminating the deposition process and its associated contamination risks to optical surfaces.
Data Source
AI summary
A method for manufacturing in space a rigid structure having a lattice is disclosed. The method includes creating of at least two framework elements from a coil of metal strip or wire, and creating of the lattice by cold-connecting the framework elements.