Multicore Cable Detection Wire Layout for Bend Disconnection Prediction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multicore cables with non-symmetrically disposed coated electric wires face challenges in predicting disconnection due to uneven load distribution, making it difficult to accurately predict disconnection of coated electric wires, especially when they are subjected to bending motions.
Innovation Solution
The multicore cable design includes a detection wire with a stranded conductor and a sheath, where the detection wire is strategically positioned within the coated electric wires, with a filament diameter equal to or greater than the electric wire filaments, to ensure it disconnects before the coated electric wires, allowing for accurate prediction of disconnection by measuring electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection wire has a smaller filament diameter than the electric wire filaments, then the detection wire is more likely to disconnect first under normal conditions, but under bending motions with non-symmetric wire arrangement, the load distribution becomes uneven making disconnection prediction inaccurate
Solution Approach 1:
The patent changes the critical parameter of filament diameter, setting the detection wire filament diameter to be equal to or greater than the electric wire filaments. This parameter change ensures that under bending motions, the detection wire experiences sufficient load to disconnect before the electric wires, while maintaining accurate disconnection prediction regardless of non-symmetric wire arrangement. This resolves the contradiction by finding an optimal parameter value that works under both normal and bending conditions.
2Reliability
If the detection wire is positioned outside the coated electric wires, then it experiences less interference, but it cannot accurately predict disconnection of the coated electric wires under bending motions
Solution Approach 1:
The patent applies the nesting principle by positioning the detection wire inside the region enclosed by the coated electric wires. This nested arrangement ensures that the detection wire is surrounded by the electric wires, allowing it to experience similar bending loads and accurately predict their disconnection. The detection wire is effectively nested within the bundle of electric wires, sharing the same mechanical environment.
3Reliability
If the filament diameter of the detection wire is made equal to or greater than the electric wire filaments, then accurate disconnection prediction is achieved under bending motions, but the detection wire may not disconnect first under normal conditions
Solution Approach 1:
The patent optimizes the filament diameter parameter to be equal to or greater than the electric wire filaments, which ensures that under bending motions the detection wire experiences sufficient stress to disconnect before the electric wires. This parameter change resolves the contradiction by establishing a diameter relationship that prioritizes accurate prediction under bending conditions, where the larger or equal diameter combined with the nested positioning ensures the detection wire bears adequate load.
Data Source
AI summary
A multicore cable includes a plurality of coated electric wires; a detection wire; and a sheath. The coated electric wires include an electric wire conductor and an electric wire coating. The electric wire conductor is a stranded wire of a plurality of electric wire filaments. The electric wire coating covers an outer surface of the electric wire conductor. The detection wire includes a detection wire conductor that is a stranded wire of a plurality of detection wire filaments. The sheath covers an outer surface of a core that includes the coated electric wires and the detection wire. The detection wire is disposed in a region enclosed by the coated electric wires. A filament diameter of the detection wire filaments is equal to or greater than a filament diameter of the electric wire filaments.