Solar Sail Attachment Mechanism for Controlled Deployment
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Solution Overview
Problem
Conventional solar sail deployment systems face mechanical failure risks due to long column buckling and lack controlled deployment and stowage capabilities, leading to uncontrolled sail material behavior during extension and retraction.
Innovation Solution
A spatially-periodic attachment mechanism along the length of booms allows for relative movement between the sail material and support structure, enabling controlled deployment and retraction by using retraction mechanisms and attachment features like rings and tethers to manage sail material and distribute loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the vane is directly attached to the terminal end of the boom, then the attachment point creates a high tension load on the boom, but this leads to long column buckling and mechanical failure risk
Solution Approach 1:
The attachment is segmented from a single terminal point to multiple discrete attachment points distributed along the boom length. This segmentation distributes the high tension load across multiple locations, preventing concentration of stress that would cause long column buckling while maintaining overall attachment strength.
Solution Approach 2:
The attachment transitions from a one-dimensional terminal point attachment to a multi-dimensional distributed attachment along the boom's length. By spreading attachments across multiple positions rather than concentrating at one end, the system resolves the conflict between attachment strength and structural reliability.
2Device complexity
If conventional attachment methods are used, then the boom structure is simple, but the deployment and stowage operations are uncontrolled and lack precision
Solution Approach 1:
The attachment system incorporates dynamic elements including movable attachment points along the boom, deployable booms that can extend and retract, and controlled material attachment/detachment mechanisms. These dynamic features enable precise control during deployment and stowage operations while maintaining reasonable structural complexity.
Solution Approach 2:
The system employs self-contained deployment mechanisms where the boom structure itself provides the means for controlled deployment through its geometric configuration and inherent mechanical properties, reducing the need for external control systems while maintaining operational precision.
3Area of moving object
If the boom is extended to full deployment, then the sail area is maximized, but the risk of mechanical failure from long column buckling increases
Solution Approach 1:
The boom structure is divided into multiple segments or the attachment is segmented along the boom length, allowing the sail area to be fully extended while distributing structural loads to prevent buckling of individual boom sections.
Solution Approach 2:
The attachment points are pre-positioned or pre-configured along the boom at optimal locations that prevent buckling before deployment occurs. This preliminary configuration ensures structural reliability is maintained throughout the full deployment range.
Data Source
AI summary
Exemplary embodiments provided herein include an attachment and deployment system and method. Exemplary embodiments may use features together or separately as desired. The attachment feature may be used to periodically couple a solar sail.