Cable Sheath Layout for Uniform Wire Break Precursor Detection
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Solution Overview
Problem
Existing cable designs for detecting electric wire damage, such as breaks, suffer from varying sensitivity depending on the position along the cable's axial direction due to relative movement between the target electric wire and detection wire, making it difficult to predict and prevent equipment malfunctions.
Innovation Solution
A cable design with detection wires having lower bending resistance than the target wires, surrounded by a sheath in close contact with the wire group, maintains a consistent positional relationship, allowing for sensitive detection of wire breaks through impedance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection wire is provided with lower bending resistance than the target electric wire, then the detection wire fractures earlier to indicate a precursor of break, but the sensitivity of detection varies depending on the position in the axial direction due to relative movement between wires
Solution Approach 1:
The patent uses a sheath (flexible shell) that is in close contact with the outer periphery of the electric wire group to maintain fixed positional relationships between the detection wire and target electric wire, preventing relative movement that would cause varying detection sensitivity along the axial direction
2Reliability
If the detection wire has lower bending resistance to fracture earlier, then break precursor can be detected, but the positional relationship between detection wire and target electric wire varies along the axial direction
Solution Approach 1:
The sheath acts as a flexible shell that constrains the electric wire group, maintaining stable positional relationships between wires while allowing the cable to bend and flex during use
3Adaptability or versatility
If target electric wires can move in the space surrounded by the sheath, then the cable has flexibility, but the relative positions of target electric wire and detection wire differ depending on axial position
Solution Approach 1:
The sheath provides a balanced solution by being flexible enough to allow cable bending and wire group movement, while simultaneously maintaining close contact to prevent excessive relative movement between individual wires, thus preserving detection sensitivity consistency
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 design enables consistent, high-sensitivity detection of wire breaks regardless of position, facilitating timely replacement and preventing equipment failures.
Implementation Method 1
when an electric wire is repeatedly subjected to bending or vibration, the conductor included in the electric wire may break due to metal fatigue
Implementation Method 2
a measurement unit configured to measure a characteristic impedance of the detection wire conductor
Data Source
AI summary
A cable with an abnormality precursor detection function includes: one or more target electric wires each including a corresponding one of electric wire conductors and an electric wire coating that covers an outer periphery of the electric wire conductor; one or more detection wires each including a corresponding one of detection wire conductors and a detection wire coating that covers an outer periphery of the detection wire conductor; and a sheath that covers an outer periphery of an electric wire group including the one or more target electric wires and the one or more detection wires.