Parallelogram Lattice Mast for Deterministic Passive Deployment
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Solution Overview
Problem
Passively deployed mast systems often face mechanical indeterminacy and heightened risk of damage or poor operation due to the lack of controlled deployment, leading to increased weight, complexity, and cost when additional motors are used for controlled deployment.
Innovation Solution
A passively deployable mast system comprising a series of parallelogram articulated sections that deploy deterministically, utilizing springs and hinge linkages to ensure synchronized and rigid deployment, eliminating the need for external control during deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional motors are used for controlled deployment, then deployment reliability is improved, but device complexity and weight increase
Solution Approach 1:
The mast system uses self-contained spring mechanisms and parallelogram linkages that automatically deploy the structure without requiring external motors or control systems. Each section has its own deployment mechanism that activates when the mast is extended, making the system self-sufficient and eliminating the need for complex controlled deployment systems.
Solution Approach 2:
The mast is divided into multiple modular sections connected by parallelogram linkages, with each section having independent spring-loaded deployment mechanisms. This segmentation allows each section to deploy independently and reliably without requiring a single complex controlled system, while maintaining overall structural integrity through the geometric constraints of the parallelogram configuration.
2Reliability
If additional motors are used for controlled deployment, then deployment reliability is improved, but weight increases
Solution Approach 1:
The deployment system uses self-contained spring mechanisms that provide the necessary force for deployment without requiring external motors. The springs are pre-loaded and automatically activate when the mast is extended, eliminating the weight of motors while maintaining reliable deployment through the mechanical advantage of the spring-latch system.
Solution Approach 2:
The mast is divided into multiple modular sections, each with its own lightweight spring mechanism. This segmentation distributes the deployment function across multiple small, lightweight components rather than requiring heavy motors at each section, reducing overall weight while maintaining deployment reliability through redundancy.
3Device complexity
If passive deployment is used, then device complexity is reduced, but mechanical indeterminacy increases leading to heightened risk
Solution Approach 1:
The parallelogram linkages are configured with specific geometric asymmetries that create a determinate mechanical system. The linkages have fixed pivot points and constrained motion paths that eliminate mechanical indeterminacy, ensuring that forces are properly distributed and deployment follows a predictable, reliable sequence without requiring complex control systems.
Solution Approach 2:
The mast system transitions from a static indeterminate structure to a dynamic determinate system during deployment. The parallelogram linkages create a kinematic chain that naturally progresses through deployment stages, with each section activating in sequence based on the mechanical state of previous sections, providing deterministic behavior without external control.
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 mast system achieves deterministic and synchronized deployment, reducing the risk of damage and operational issues while maintaining structural integrity and scalability, without the need for additional motors or external control.
Implementation Method 1
utilizing springs and hinge linkages to ensure synchronized and rigid deployment
Data Source
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AI summary
A self-deployable mast 10, typically for supporting a payload. The mast has top longerons 21, bottom longerons 22, and hinge linkages 23 that form a series of moveable parallelograms operable to fold and unfold. The mast 10 further has springs 24 and trusses 25, with at least one spring 24 and one truss 25 associated with each of the parallelograms. The springs 24 are operable to deploy the mast 10 from a folded position to a deployed position. Each truss 25 is operable to become in tension diagonally across its associated parallelogram once the mast 10 is deployed into a final position. In other embodiments, motors 101 may be used instead of springs 24.