Cable-Driven Telescopic Boom With Nested Segment Deployment

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Solution Overview

Problem

Conventional deployable booms are complex, prone to failure, and difficult to deploy and maintain, particularly in satellite applications where antennas and instruments need to be deployed away from the satellite.

Innovation Solution

A cable-driven telescopic boom system with multiple nested segments, using continuous tension cables to deploy and retract the boom segments, which reduces the need for pretensioning and minimizes self-deploying behavior, while allowing for tight nesting and varied segment configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional deployable booms use lead screws or hydraulics to deploy segments, then the boom can achieve deployment functionality, but the device complexity increases and reliability decreases due to many parts that can fail

Engineering Contradiction:

Improveboom deployment reliabilityVSAvoiddeployment mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cable is divided into multiple segments corresponding to each boom segment, with each cable segment independently engaging its associated boom segment. This segmentation allows the complex deployment mechanism to be broken down into simpler, independent units, reducing overall system complexity while maintaining reliability through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Cable segments act as intermediaries between the drive mechanism and boom segments, transferring force through a simple tension-based mechanism. This intermediary approach replaces complex direct-drive mechanisms with a simpler cable-mediated system, reducing the number of parts that can fail while maintaining deployment functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If the cable-driven system is significantly pretensioned to prevent self-deploying behavior, then boom stability improves, but the cable tension requirements and structural loads increase

Engineering Contradiction:

Improveboom stowed configuration stabilityVSAvoidcable tension force

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

Restraint mechanisms are applied to the boom segments to prevent premature deployment before the cable-driven system is fully engaged. This preliminary anti-action allows the system to deploy without requiring excessive pretensioning, as the restraints prevent self-deploying behavior during the deployment process itself rather than relying solely on high cable tension

Inventive Principle:

Principle #9Preliminary anti-action

3Volume of moving object

If boom segments are designed for tight nesting in stowed position, then the stowed volume decreases, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvestowed boom volumeVSAvoidsegment nesting precision

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

Boom segments are designed to nest within each other in a telescopic arrangement, with each segment containing the next smaller segment. This nesting configuration minimizes the overall stowed volume while the cable-driven deployment mechanism provides controlled movement that compensates for manufacturing tolerances, reducing the stringency of precision requirements

Inventive Principle:

Principle #7Nested doll (Nesting)

4Ease of operation

If conventional booms use multiple separate cables or complex mechanisms for each segment, then deployment control improves, but the device complexity and number of parts increase

Engineering Contradiction:

Improveboom deployment controlVSAvoidcable system complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

Multiple cable functions are merged into a single continuous cable that spans all boom segments, with the cable looping through or around each segment in sequence. This merging approach maintains deployment control for each individual segment while eliminating the need for separate cables and associated hardware for each segment, significantly reducing system complexity

Inventive Principle:

Principle #5Merging (Combining)

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 cable-driven telescopic boom system provides a simple, reliable, and maintainable deployment mechanism that minimizes complexity and failure risks, enabling efficient extension and retraction of boom segments while maintaining structural integrity and ease of use.

Implementation Method 1

the drive mechanism including a cable and a motor that can apply tension to the cable

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentEP4484304A1Cable-driven telescopic boom

Publication Date: 2025.01.01 EAGLE TECHNOLOGY LLC

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AI summary

A cable-driven telescopic boom with several boom segments (180,200,220) repositionable between stowed positions and deployed positions. The boom includes multiple spaced apart and separate cables (600) that engage pulleys connected to each boom segment (180,200,220). A drive system can be used to apply tension to the cables (600) to reconfigure the boom from a stowed configuration to a deployed configuration.