Cable Disconnection Detection via Periodic Bending Signals
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Solution Overview
Problem
Existing methods for detecting disconnection in cables struggle to detect initial disconnections with high sensitivity due to small resistance value changes and interference from shape changes during bending, leading to potential false negatives or delayed detection.
Innovation Solution
A disconnection detecting system that uses a bending mechanism to periodically apply force to the cable, causing it to reciprocate between two bending states, and a measuring apparatus to extract the amplitude of the bending frequency component from the resistance value variations, allowing for sensitive detection of disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance value measurement is used to detect disconnection, then disconnection can be detected when a large number of wires are disconnected, but disconnection cannot be detected with high sensitivity when only a small part of wires are disconnected
Solution Approach 1:
The cable is periodically bent and stretched in one direction to create cyclic mechanical stress. This periodic action causes disconnected wire portions to repeatedly contact and separate, generating a current component that varies in synchronization with the bending cycle, which can be detected with high sensitivity
Solution Approach 2:
The cable undergoes mechanical vibration through periodic bending and stretching. This vibration induces relative motion between disconnected wire portions, causing them to intermittently contact and separate, thereby generating detectable electrical signals that indicate disconnection
2Measurement precision
If the cable is bent and stretched in one direction to detect disconnection, then disconnection can be detected through current component variation, but resistance value fluctuation due to shape change creates false signals that reduce detection accuracy
Solution Approach 1:
The cable is bent and stretched only in one direction rather than symmetrically in both directions. This asymmetric deformation creates a specific mechanical stress pattern that enhances the contact-separation effect of disconnected wires while minimizing resistance fluctuations caused by overall shape changes
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
Enables the detection of initial disconnections with high sensitivity by distinguishing genuine disconnection signals from noise and shape-related variations, improving the reliability of cable monitoring systems.
Implementation Method 1
the measuring apparatus is configured to measure a resistance value of the cable. The resistance value varies on a time series basis in accordance with the reciprocation of the bending mechanism
Data Source
AI summary
A disconnection detecting system for detecting disconnection of any of a plurality of wires included in a cable is provided. The disconnection detecting system includes: a bending mechanism configured to periodically apply force to the cable so as to cause the cable to reciprocate between a first bending state to be bent in one direction of clockwise and counterclockwise directions and a second bending state to be bent in the other direction; and a measuring apparatus configured to measure a resistance value of the cable, which varies on a time series basis in accordance with the reciprocation of the bending mechanism, and extract a component of a bending frequency for reciprocating between the first and second bending states once from frequency components included in time-series variation in the resistance value of the cable. The disconnection is detected on a basis of amplitude of the component of the bending frequency.