Fiber Optic Cable Non-Interlocking Armor Design
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Solution Overview
Problem
Conventional fiber optic cables with interlocking armor have a large bend radius and outside diameter, making them unsuitable for tight spaces and lacking rigidity for long runs, which can lead to installation challenges and increased costs due to the need for fish tape and potential damage from crush loads.
Innovation Solution
A fiber optic cable assembly with a non-interlocking stainless-steel spiral armor, fiberglass reinforced outer sheath, aramid fiber pull material, and flame-retardant inner jacket, allowing for a smaller bend radius and increased rigidity, enabling easier installation and improved crush resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional interlocking armor is used, then crush performance is improved, but bend radius and outside diameter increase
Solution Approach 1:
The armor layer is segmented into discrete interlocking elements (armor rods or bands) that can flex relative to each other, allowing the cable to bend while maintaining crush resistance. This segmentation enables the armor to provide structural protection without forming a rigid continuous shell that would prevent bending.
Solution Approach 2:
The armor design changes the geometric parameters of the protective layer by using interlocking elements with specific cross-sectional shapes and arrangements that allow controlled deformation. The interlocking mechanism enables the armor to transition from a rigid protective barrier to a flexible structure that can accommodate bends while retaining crush resistance.
2Strength
If conventional interlocking armor is used, then crush performance is improved, but outside diameter increases
Solution Approach 1:
The armor utilizes thin, flexible interlocking elements rather than thick rigid shells. These thin armor rods or bands provide adequate crush protection through their interlocking geometry and material properties while maintaining a compact overall cable diameter suitable for tight installation spaces.
3Reliability
If larger bend radius is required, then optical performance is maintained, but installation difficulty increases
Solution Approach 1:
The armor structure is designed to be dynamically flexible, allowing the cable to adapt its bend radius during installation based on routing requirements. The interlocking elements can flex and deform elastically to accommodate tight bends during installation while maintaining sufficient rigidity during operation to preserve optical performance, effectively providing dynamic adaptation between installation and operational states.
Data Source
AI summary
The specification relates to a fiber optic cable assembly. The fiber optic cable assembly includes: an outer sheath; fiberglass reinforced panels; a pull material; an inner jacket; a strength material; non-interlocking armor; and a tight buffer of optical fibers.