Modular Reflector Assembly Thermal Decoupling
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Solution Overview
Problem
Conventional reflector antennas face challenges due to the coupling of a stiff backing structure with a flexible reflective surface, leading to distortion at on-orbit temperature extremes, and require custom machining for each unique antenna shape, making design and construction complex and time-consuming.
Innovation Solution
A modular reflector assembly featuring a thermally decoupled shell and support frame, where the shell is mechanically coupled to the support frame using isotropic laminate support links that provide a gap between them, allowing the support frame to expand and contract without distorting the shell, and maintaining the shell's shape through its thermally stable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shell is mechanically coupled to the support frame with a stiff backing structure, then structural support is provided, but the stiff backing structure distorts the flexible reflective surface at on-orbit temperature extremes
Solution Approach 1:
The patent introduces support links as intermediary elements between the support frame and the shell. These support links act as mediators that mechanically connect the two structures while allowing relative movement, preventing direct transmission of thermal expansion forces from the stiff support frame to the flexible shell, thus avoiding distortion of the reflective surface.
Solution Approach 2:
The support links are designed with specific mechanical properties (flexibility, thermal expansion characteristics) that differ from both the stiff support frame and the flexible shell. By changing the parameters of the connecting elements, the system accommodates thermal expansion of the support frame without transmitting these changes to the shell, maintaining the shell's shape stability at temperature extremes.
2Shape
If custom-machined background structure ribs are used to match each different shell shape, then the reflective surface shape is precisely maintained, but the design and construction becomes complex and time-consuming
Solution Approach 1:
The patent divides the support structure into modular support links rather than using a monolithic custom-machined backing structure. Each support link is a standardized component that can be independently manufactured and assembled. This segmentation allows the same support frame design to accommodate different shell shapes by simply adjusting the configuration or number of support links, reducing design complexity and manufacturing time.
Solution Approach 2:
The support links are designed as universal components that can be used with multiple different shell configurations. Rather than creating custom-machined ribs for each specific shell shape, the same standardized support link design serves multiple functions across different antenna models, simplifying the design process and reducing construction time while maintaining the ability to precisely maintain reflective surface shapes.
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 modular design minimizes signal distortion and reduces complexity and cost by allowing the same support frame to be used with different shell shapes, ensuring minimal shape change and maintaining signal integrity across temperature variations, thus simplifying design and assembly processes.
Implementation Method 1
the support frame to expand and contract without distorting the shell
Implementation Method 2
The shell is thermally decoupled from the support frame by the plurality of support links
Data Source
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AI summary
A modular reflector assembly (100) includes a shell (104) and a support frame (106). The modular reflector assembly (100) also includes a plurality of support links (108) that mechanically couple the shell (104) to the support frame (106). The shell (104) is thermally decoupled from the support frame (106) by the plurality of support links (108). The modular reflector assembly (100) may be part of a reflector antenna that may be mounted on a satellite. A front face of the shell (104) may be a reflective surface of the reflector. The support links may carry the launch loads including axial force, circumferential force and radial moment. On orbit, during temperature swings, the support links flex such that the support frame does not distort the shell.