Flexible Litz Wire Cable System for Aircraft Cabin Weight Reduction
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Solution Overview
Problem
Conventional cables used in aircraft and vehicles are inflexible, heavy, and require frequent replacement due to fixed lengths, leading to time-consuming and costly reconfiguration when seat row distances change, and are unsuitable for tight spaces.
Innovation Solution
A lightweight, flexible cable system using fine stranded Litz wire with a high-temperature braided nylon jacket, allowing for adjustable lengths and multiple signal transmission, meeting FAA and JAA standards for weight, temperature, and flammability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional fixed length cables are used to electrically couple seat rows, then the cable structure is simple and easy to manufacture, but the cable weight is high and flexibility is poor
Solution Approach 1:
The cable assembly is divided into multiple segments: individual Litz wire strands, conductor bundles, insulation layers, and connector sections. This segmentation allows each component to be optimized independently for weight and flexibility while maintaining manufacturing simplicity through standardized assembly processes.
Solution Approach 2:
The cable employs composite construction combining Litz wire (multiple fine strands for flexibility), polymer insulation (for electrical isolation), and connector housings (for mechanical coupling). This composite approach achieves reduced weight through material optimization while maintaining ease of manufacture through modular assembly.
2Adaptability or versatility
If conventional cables with fixed length are used, then the cable structure is straightforward, but the cable must be replaced when seat row distance changes, leading to time-consuming and expensive operations
Solution Approach 1:
The cable assembly incorporates adjustable length mechanisms through telescopic sections or extendable connectors that allow the cable to dynamically adapt to different seat row distances. This eliminates the need for replacement when configuration changes occur, saving time and resources.
Solution Approach 2:
The cable design provides multi-functionality by incorporating universal connectors and adjustable length capabilities that allow a single cable type to serve multiple seat row configurations. This universal design eliminates the need for multiple specialized cable inventories and simplifies replacement operations.
3Ease of operation
If conventional cables are used in tight spaces around seat rows, then the installation path is fixed and simple, but the cable stiffness and weight make installation difficult and time-consuming
Solution Approach 1:
The cable employs flexible Litz wire construction with thin polymer insulation layers that provide the necessary flexibility to navigate tight spaces around seat rows. This flexible shell structure reduces stiffness while maintaining protection, enabling easier installation in confined areas.
Solution Approach 2:
The cable design changes physical parameters including strand diameter, strand count, and insulation thickness to optimize the weight-to-flexibility ratio. By adjusting these parameters, the cable achieves reduced weight per unit length while maintaining sufficient flexibility for installation in tight passenger cabin spaces.
4Device complexity
If multiple signal types are transmitted through separate cables, then each cable can be optimized for its specific function, but the overall system weight and complexity increase
Solution Approach 1:
Multiple signal conductors (power, data, audio, video) are merged into a single integrated cable assembly with common insulation and connector structures. This merging reduces the total number of separate cables needed, thereby reducing overall weight and simplifying the cable management system while maintaining optimized signal transmission for each type.
Data Source
AI summary
A cable system includes one or more bundles of conductive wire having multiple thin strands of flexible wire cable that are individually coated with an insulation layer. The bundles of conductive wire are covered by wire jacketing material and are further covered by a nylon braiding material. The cable is preferably made by coating individual wire strands with an insulating material, and then forming wire strands into wire. A thin insulating material may then be extruded over the bundles of wire strands, which are then twisted and/or shielded into cables forming a subassembly. The group of wires is formed into cables. A thin insulating material may be extruded over the cable subassemblies as a jacketing layer before the cable is cut to the desired length and braided or jacketed.