Membrane Support Structure with Tapered Spokes for Stress Reduction
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Solution Overview
Problem
Radiation windows face challenges in being both transmissive and robust, as existing support structures obscure radiation and can be mechanically weak due to the need for increased fractional open area or reduced thickness, leading to stress concentrations and potential failure.
Innovation Solution
A support structure design featuring spoke-like members with a transition region between the transmissive area and the flange, providing intermediate rigidity and reducing stress concentrations, allowing for thinner, more transmissive, and robust structures with greater fractional open areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support structure uses a solid mesh or grid pattern to provide mechanical strength, then the structural integrity is improved, but the radiation transmission is reduced due to increased obstruction
Solution Approach 1:
The support structure is divided into discrete struts arranged in a lattice pattern rather than a solid mesh, creating gaps between elements. This segmentation reduces radiation obstruction while maintaining mechanical strength through the distributed support network, directly resolving the contradiction between structural integrity and radiation transmission.
Solution Approach 2:
The support structure employs a lattice configuration with inherent porosity, where the open spaces between struts allow radiation to pass through with minimal interference. This porous architecture maintains structural rigidity while significantly improving radiation transmission compared to solid mesh designs.
2Productivity
If the support structure thickness is reduced to improve radiation transmission, then the fractional open area is increased, but the mechanical strength and stress resistance are reduced
Solution Approach 1:
The support structure combines materials with different properties - using high-strength materials for the struts themselves while maintaining thin overall thickness. This composite approach allows the structure to be thin enough for high radiation transmission while the strategically placed struts provide necessary mechanical strength and stress resistance.
Solution Approach 2:
The struts are designed with curved or tapered profiles rather than straight cylindrical forms, optimizing the distribution of mechanical stresses along their length. This curvature allows the thin structure to better resist bending moments and stress concentrations, maintaining strength despite reduced thickness.
3Reliability
If the support structure uses thicker struts to reduce stress concentrations, then the mechanical robustness is improved, but the radiation transmission is reduced due to increased material in the path
Solution Approach 1:
Instead of using fewer thick struts, the structure employs multiple thinner struts arranged in a segmented lattice pattern. This distribution of support elements provides comparable or superior mechanical robustness through collective strength while minimizing the total material cross-section that attenuates radiation.
Solution Approach 2:
The support structure transitions from a two-dimensional planar support to a three-dimensional lattice configuration. This adds vertical dimensionality with tapered struts that are thicker at mounting points for mechanical robustness but thinner along their length, allowing radiation to pass through with minimal attenuation while maintaining structural reliability.
4Strength
If the support structure uses a dense lattice pattern to improve mechanical strength, then the structural rigidity is improved, but the fractional open area is reduced
Solution Approach 1:
The lattice structure employs varying strut densities and cross-sectional dimensions at different locations - with closer spacing and thicker struts where mechanical strength is needed (near mounting points and high-stress regions) and wider spacing with thinner struts in low-stress regions. This local optimization maintains structural rigidity while maximizing the fractional open area for radiation transmission.
Solution Approach 2:
The lattice is configured with three-dimensional tapered struts that change cross-section along their length, being thicker at the ends where they connect to mounting surfaces and thinner in the middle sections. This dimensional variation provides structural rigidity at connection points while minimizing material in the radiation path, thereby maintaining high fractional open area.
Data Source
AI summary
A support structure for a membrane comprises a plurality of support members and at least one flange, including: (a) a first set of spoke-like support members that extend generally from at least one flange toward a common hub and that have a distal end joined to at least one flange and a proximal end joined to the common hub; and (b) at least one subsequent set of spoke-like support members that are distributed between circumferentially adjacent pairs of spoke-like support members from the prior sets and that extend generally from at least one flange toward the hub, each having a distal end joined to at least one flange and a proximal end connected to the nearest circumferentially adjacent pair of spoke-like support members from the prior sets via a pair of approximately straight anchoring support members which join together and form an angular joint at or near said proximal end, with the vertex of said angular joint pointing generally away from the hub.