Robot Vibration Threshold Control for Variable-Speed Fault Detection
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Solution Overview
Problem
Existing abnormality detection methods in robots fail to accurately predict failure timing due to varying time to failure based on work speed, leading to either premature detection at high work speeds or missed detection at low work speeds.
Innovation Solution
An abnormality detecting device that adjusts a vibration threshold based on the length of work time and pause time, allowing for early prediction of failures at high work speeds and preventing false alarms at low work speeds by using a dynamic threshold adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold is used for abnormality detection, then the detection method is simple, but the detection accuracy deteriorates when work speed varies
Solution Approach 1:
The patent applies dynamics by making the threshold value changeable rather than fixed. The threshold is dynamically adjusted based on work time parameters, allowing the detection system to adapt to varying work speeds and conditions, thereby maintaining high detection accuracy across different operational scenarios
Solution Approach 2:
The patent changes the threshold parameter based on work time characteristics. By modifying the threshold value according to work time length and pause time, the system optimizes abnormality detection accuracy for different work speeds without requiring complex additional hardware
2Reliability
If early failure prediction is implemented for high work speed, then failure prediction timing is improved, but false detection increases for low work speed
Solution Approach 1:
The patent applies local quality by setting different threshold values for different work time conditions. Instead of using a uniform threshold, the system tailors the threshold to specific work time characteristics, ensuring optimal detection accuracy for each operational scenario and reducing false detections
Solution Approach 2:
The system changes the detection threshold parameter based on work time length and pause time. This parameter adjustment allows the system to predict failures at appropriate timing for different work speeds, improving reliability without causing false detections in low-speed operations
3Productivity
If work time is reduced to increase productivity, then production efficiency is improved, but time to failure is shortened
Solution Approach 1:
The patent applies preliminary action by detecting abnormalities earlier when work time is short. The system proactively identifies potential failures before they occur by continuously monitoring vibration and comparing against dynamically adjusted thresholds, allowing maintenance to be scheduled before actual failure happens
Solution Approach 2:
The system uses feedback from vibration monitoring to continuously assess apparatus health. By comparing real-time vibration data against work-time-adjusted thresholds, the system provides feedback on abnormality levels, enabling timely intervention to maintain reliability despite reduced work times
Data Source
AI summary
An abnormality detecting device determines an abnormality in an apparatus by comparing data on vibration detected in the apparatus with a predetermined threshold. Moreover, the abnormality detecting device changes the threshold depending on a length of work time required for the apparatus to perform a certain work.