Reconfigurable Altmann Linkage Frame for Stable Multi-Form Deployment
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Solution Overview
Problem
Existing deployable frame structures lack flexibility in configuration and stability under static loads, and do not effectively utilize the Altmann mechanism for multiple form transitions.
Innovation Solution
A reconfigurable deployable frame system utilizing the Altmann mechanism with six revolute joints and overconstrained single-loop bar mechanisms, allowing for transitions from a closed cylindrical form to a vaulted, planar, and collapsible form, with enhanced stability and modular adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing deployable frame structures are used, then structural simplicity is maintained, but configuration flexibility and stability under static loads are insufficient
Solution Approach 1:
The frame structure is divided into multiple modular Altmann mechanism units, each capable of independent movement and configuration. These modules can be assembled in different patterns to create various structural forms (cylindrical, vaulted, planar), enabling configuration flexibility while maintaining manageable complexity through standardization of the basic module.
Solution Approach 2:
The Altmann mechanism module serves multiple functions: it provides structural support, enables configuration changes between different forms (cylindrical, vaulted, planar), and maintains stability under static loads. This multi-functionality reduces the need for separate components for each function, balancing versatility with complexity.
2Strength
If existing deployable frame structures are used, then ease of manufacture is maintained, but resistance to static loads is insufficient
Solution Approach 1:
The Altmann mechanism is designed with pre-configured geometric constraints and linkages that inherently provide static load resistance. The mechanism's geometry is predetermined to distribute loads efficiently across multiple links and joints, ensuring strength is built into the structure before deployment rather than requiring additional reinforcement during assembly.
Solution Approach 2:
The structure merges the functions of load-bearing and configuration flexibility into a single integrated Altmann mechanism system. The same links and joints that enable movement between configurations also provide structural support and load resistance, eliminating the need for separate bracing or support structures.
3Adaptability or versatility
If existing deployable frame structures are used, then portability is maintained, but modular adaptability for various configurations is insufficient
Solution Approach 1:
The structure is segmented into standardized Altmann mechanism modules that can be easily transported and assembled. Each module is self-contained with defined connection interfaces, allowing rapid assembly into different configurations (cylindrical, vaulted, planar) without requiring complex alignment or customization, thus maintaining ease of operation while enhancing modular adaptability.
Solution Approach 2:
The system enables parameter changes in structure configuration by adjusting the arrangement and connectivity of Altmann mechanism modules. The same basic modules can be configured with different linkages, joint arrangements, and spatial orientations to create various structural forms, allowing adaptability without requiring different component sets for each configuration.
Data Source
AI summary
Disclosed is a reconfigurable deployable frame system based on the Altmann mechanism. The system is capable of transitioning from a closed cylindrical form to a vault shape, then to a planar form, and finally to a collapsible form. This is achieved by combining links, L-shaped connecting elements, and revolute joints.