Helical Cable Management for Rotating Propeller Assemblies
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Solution Overview
Problem
High altitude platforms, such as balloons in the stratosphere, face challenges in maintaining reliable data communication and power supply due to repeated rotation of propeller assemblies, which causes strain and potential failure of cables used for these systems.
Innovation Solution
A rotatable cable management assembly with a helical cable arrangement that allows for expansion and contraction of the cable diameter, distributing deformation along the helical length, reducing strain and extending the operational lifespan of cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the propeller assembly rotates repeatedly to adjust the balloon's heading, then the directional control and mobility of the platform is improved, but the cables experience increased strain and are more likely to fail
Solution Approach 1:
The patent applies a helical (curved) cable arrangement instead of a straight linear configuration. The cables are wound in a helix around the connection member, allowing them to accommodate rotational movement of the propeller assembly without experiencing excessive strain. This curved geometry enables the cables to flex and expand/contract naturally during rotation, significantly reducing stress and preventing cable failure while maintaining full 360-degree rotational capability for directional control.
Solution Approach 2:
The cable management system is designed to be dynamic rather than static. The helical cable arrangement allows the cable diameter to expand and contract as the propeller assembly rotates, accommodating the changing spatial requirements during rotational movement. This dynamic adaptation enables the cables to handle repeated rotations without fixed constraints, maintaining reliability throughout the operational lifetime of the platform.
2Reliability
If the cables are constrained to prevent rotation, then cable strain is reduced, but the propeller assembly cannot rotate to adjust the balloon's heading
Solution Approach 1:
The helical configuration provides a curved path for the cables that naturally accommodates rotational movement. As the propeller assembly rotates, the cables follow the helical path, expanding and contracting the helix diameter rather than being constrained. This curved geometry simultaneously reduces strain on the cables and enables full rotational capability for heading adjustment.
Solution Approach 2:
The system allows the helical diameter of the cables to change as a parameter during rotation. When the propeller assembly rotates, the helical diameter expands and contracts dynamically, enabling rotational movement without constraining the cables. This parameter change approach maintains both cable reliability and rotational adaptability.
3Device complexity
If traditional linear cable arrangements are used, then the system structure is simple, but the cables fail under repeated rotational stress
Solution Approach 1:
The patent transitions from a simple linear cable arrangement to a helical (curved) configuration. While this increases structural complexity slightly, it dramatically improves cable lifespan by distributing deformation along the helical length and reducing strain during rotation. The helical arrangement is a well-understood geometric form that provides an elegant solution to the rotational stress problem.
Solution Approach 2:
The cable arrangement moves from a one-dimensional linear configuration to a three-dimensional helical structure. This dimensional change allows the cables to accommodate rotational movement in multiple directions and planes, distributing stress more effectively and preventing the cable failures that occur with simple linear arrangements under repeated rotation.
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 helical cable management system effectively mitigates cable failure and ensures reliable data communication and power supply throughout the operational lifetime of high altitude platforms by distributing deformation and reducing strain on cables during repeated rotations.
Implementation Method 1
permitting expansion and contraction of a helical diameter of the one or more cables wound in the helical arrangement
Data Source
AI summary
Aspects of the technology relate to rotational electromechanical systems, in which data and or power are supplied to components while one part of the system is rotating relative to another part of the system. Repeated rotation may create strain on or otherwise cause the cables to intermittently or permanently fail. A helical cable management system is provided that enables full rotation to the extent permitted. One or more cables are wound in a helical shape around the axis of rotation, which distributes the deformation of the cable along the helical length. Rotation in one direction causes the helix diameter to increase, while rotation in the other direction causes the helix diameter to decrease. A structure is used to maintain the distance between helical turns, while permitting the increase and decrease of the helix diameter. This reduces the overall strain on the cables, which can significantly extend their useful lifetime.