Spiral Flexible Track Motorization for Spatial Structures
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Solution Overview
Problem
Existing deployment mechanisms for spatial appendices, such as antennas or solar generators, face limitations including a maximum angular deployment capacity of 180°, irregular motorization torque, and end-of-travel impacts due to unregulated deployment speed, leading to over-motorization and increased weight to mitigate damage.
Innovation Solution
A motorization system utilizing two spiral-shaped flexible tracks that are rotatable relative to each other, with a contact point offset from the crossing point of a linking element, allowing for adjustable torque and extended angular deployment beyond 180°, featuring a motorization device with parallel winding cylinders and flexible tracks with controlled pre-stressing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known motorization components (torsion-spring, spiral-spring, Carpentier-joint) are used to ensure full deployment, then deployment reliability is improved, but over-motorization occurs causing end-of-travel impacts and parasitic torque
Solution Approach 1:
The patent changes the geometric parameters of the flexible tracks from circular to spiral shape, which fundamentally alters the torque generation characteristics. This parameter change enables the system to achieve deployment reliability while eliminating over-motorization effects and parasitic torque through the inherent mechanics of the spiral geometry
Solution Approach 2:
The patent introduces dynamic control of deployment speed through regulated mechanisms, transforming the static or unregulated deployment process into a controlled dynamic process. This enables the system to maintain reliability while minimizing end-of-travel impacts through speed regulation
2Strength
If deployable structures are dimensioned and reinforced to resist end-of-travel impacts, then impact resistance is improved, but overall weight of the structure increases
Solution Approach 1:
The patent applies preliminary action by using the regulated deployment speed control to prevent excessive kinetic energy accumulation before deployment completion. By controlling the deployment process in advance, the system eliminates the need for heavy reinforcement while maintaining impact resistance
Solution Approach 2:
The patent changes the deployment parameters through speed regulation, transforming the uncontrolled high-impact deployment into a controlled low-impact process. This parameter change eliminates the need for weight-increasing reinforcement while maintaining structural integrity
3Ease of operation
If known hinge mechanisms are used for deployment, then deployment capability is achieved, but maximum angular deployment is limited to 180°
Solution Approach 1:
The patent applies curvature principles by using spiral-shaped flexible tracks instead of straight or circular configurations. This curvature transformation enables the mechanism to achieve angular deployment beyond 180° while maintaining operational simplicity through the inherent flexibility of the spiral geometry
4Ease of operation
If known deployment mechanisms are used, then deployment function is achieved, but motorization torque is very irregular due to structure
Solution Approach 1:
The patent uses the spiral curvature of the flexible tracks to transform the irregular torque characteristics into a more regular pattern. The mathematical properties of the spiral geometry provide a more uniform distribution of motorization torque throughout the deployment cycle
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
Enables deployments beyond 180° with minimal end-of-deployment impacts and adaptable torque, reducing the need for over-dimensioned motorization, minimizing weight and friction, and ensuring precise control over deployment speed and torque.
Implementation Method 1
the elasticity and rigidity of the flexible tracks are configured such as to control said torque exerted on said contact point between the flexible tracks
Implementation Method 2
at least one longitudinal linking element, said linking element being able to maintain a predetermined distance between said winding cylinders
Data Source
AI summary
A motorization device comprises two substantially parallel winding cylinders, and at least one longitudinal linking element able to maintain a predetermined distance between the winding cylinders and wound around winding tracks, the linking element consequently having a crossing point located between the winding cylinders. The motorization device includes two flexible tracks, fixed on each of the winding cylinders and arranged to face and to touch eachother at the contact point, a pre-stressing force being applied to the contact point under the effect of said linking element. The flexible tracks are spiral shaped and arranged such that the contact point between the two spiral-shaped flexible tracks, located between the winding cylinders, is offset relative to the crossing point of the linking element, such that a torque dependent on the distance between the contact point and the crossing point is applied to the contact point, causing reciprocal rotation of the flexible tracks.