Optical Fiber Composite Cable Protection Against Bending Stress
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Solution Overview
Problem
Optical fiber composite cables face issues with optical loss due to high-temperature and high-pressure environments, continuous tension, and bending stress during manufacturing and usage, leading to frequent damage and breakdown.
Innovation Solution
An optical fiber composite cable design featuring a protection member made of aromatic polyamide fibers, such as aramid, surrounding the optical fibers, with a specific winding pitch and configuration to absorb tensile forces and prevent direct stress on the optical fibers, combined with ground wires and a non-woven fabric or polyethylene terephthalate taping for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical fiber composite cable is used in harbor crane equipment, then power transmission and state monitoring functions are achieved, but the optical cable is damaged or broken due to bending stress, tension, and environmental factors
Solution Approach 1:
The cable is divided into distinct functional segments: power transmission components (conductors, insulation layers), optical monitoring components (optical fibers, protective tubes), and structural support components (steel wire strands, armors). Each segment is optimized for its specific function while working together as an integrated system, allowing the cable to withstand mechanical stresses while maintaining both power and optical functions
Solution Approach 2:
The cable employs composite material construction combining copper or aluminum conductors for power transmission, optical fibers for monitoring, aromatic polyamide protective layers for environmental resistance, and steel wire strands for mechanical strength. This multi-material composite structure enables simultaneous achievement of electrical conductivity, optical signal transmission, mechanical durability, and resistance to harbor environment factors
2Ease of manufacture
If conventional cable structure design is used, then manufacturing simplicity is maintained, but optical loss increases due to tension, bending, and high-temperature high-pressure conditions
Solution Approach 1:
The optical fibers are pre-positioned within protective tubes that are themselves embedded in the cable structure during manufacturing. The aromatic polyamide protective layers and steel wire armors are arranged in predetermined configurations that pre-compensate for expected bending and tension stresses during operation, ensuring optical fibers remain protected and properly positioned throughout the cable's service life
Solution Approach 2:
Different regions of the cable structure provide different protective qualities: the central optical fibers are surrounded by soft protective tubes, which are then encased in aromatic polyamide layers for chemical and environmental protection, while steel wire strands provide mechanical strength at the periphery. This localized differentiation of protective properties ensures optimal protection for optical components without compromising overall cable performance
Data Source
AI summary
The present invention relates to an optical fiber composite cable. The optical fiber composite cable includes at least one power line to transmit power and an optical cable to monitor a state of the power lines, and the optical cable comprises optical fibers, tubes to accommodate the optical fibers, and a protection member to surround the tubes.