Cable Wear Detection Using Signal Processing Parameters
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Solution Overview
Problem
Industrial cables used in automation systems experience wear due to mechanical stress and environmental factors, leading to transmission degradation and potential failure, necessitating regular replacement before critical conditions are reached.
Innovation Solution
A system and method for determining cable wear condition using an indicator variable based on a parameter set derived from signal processing, allowing for early identification of non-critical wear to prevent further degradation and potential system failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable replacement is performed regularly according to maintenance schedule, then system reliability is maintained, but unnecessary maintenance and associated costs occur
Solution Approach 1:
The patent changes the parameter from fixed time-based replacement to condition-based replacement by monitoring cable transmission characteristics. The system measures transmission quality parameters (such as signal attenuation, noise levels, or error rates) and compares them against thresholds to determine when actual cable degradation occurs, enabling replacement only when necessary rather than following a predetermined schedule.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors cable transmission characteristics and provides information about cable condition. This feedback loop allows the system to detect degradation trends and trigger replacement actions based on actual cable state, creating a closed-loop control system that adapts maintenance timing to real-world cable performance.
2Loss of time
If cable replacement is delayed until critical wear condition, then maintenance costs are reduced, but transmission failures occur
Solution Approach 1:
The patent performs preliminary detection of cable degradation by continuously monitoring transmission characteristics before critical failure occurs. The system identifies early signs of wear through parameter analysis and can trigger preventive replacement actions in advance, allowing maintenance to be scheduled at an optimal time that prevents failure while avoiding premature replacement.
3Difficulty of detecting and measuring
If sacrificial core is added to cable, then cable wear detection is enabled, but cable complexity and cost increase
Solution Approach 1:
The patent enables the cable to monitor its own condition by utilizing the existing data transmission functionality. The cable's transmission characteristics themselves serve as the sensing mechanism, and the monitoring system uses standard communication protocols to extract wear information without requiring separate sensing circuits or additional hardware embedded in the cable structure.
4Measurement precision
If transmission quality monitoring is implemented continuously, then cable wear is detected early, but system complexity and energy consumption increase
Solution Approach 1:
The patent implements periodic monitoring of transmission characteristics rather than truly continuous monitoring. The system can adjust the monitoring interval based on cable condition, performing measurements at regular intervals during normal operation and increasing frequency when degradation is detected, thereby balancing detection precision with energy consumption and system resource usage.
Data Source
AI summary
A system (10) for industrial automation, including a field device (1) with a function unit (2), in particular an actuator unit, sensor unit and/or control unit, which is configured to provide a function in accordance with a received payload (ND), and a communication unit (3) for receiving a payload signal (DS) containing the payload (ND) via a cable (4), the communication unit (3) being configured to provide a parameter set (PS) on the basis of the payload signal (DS) and to carry out signal processing of the payload signal (DS) using the parameter set (PS) in order to obtain the payload (ND) from the payload signal (DS), the system (10) further comprising a diagnosis device (5) which is configured to determine a cable wear condition of the cable (4) in accordance with an indicator variable (IG) based on the parameter set (PS).