Roll Eccentricity Monitoring Using Position-Wise Force Accumulation
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Solution Overview
Problem
Existing roll state monitoring systems suffer from accuracy deterioration due to noise and abnormal values, leading to incorrect identification of roll eccentricity and state determination, which can result in false alarms and reduced determination accuracy.
Innovation Solution
A roll state monitor device that detects rolling force variations at each rotation position, accumulates values, and uses correction coefficients to identify roll eccentricity, incorporating a conversion formula with plastic coefficients to distinguish between different material hardness, and employs statistical methods for accurate determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rolling force detection is used to identify roll eccentricity, then roll state monitoring capability is provided, but abnormal sensor output signals due to noise cause accuracy deterioration in identification
Solution Approach 1:
The patent segments the rolling force detection data by dividing it into multiple pieces based on rotation positions of the roll. Instead of using single abnormal detection values, the system accumulates multiple segmented detection values at each rotation position, which suppresses the impact of abnormal values caused by noise and improves identification accuracy.
Solution Approach 2:
The patent performs preliminary accumulation of rolling force detection values at each rotation position before final identification. By accumulating multiple detection values in advance and selecting representative values, the system prepares cleaned data that is less susceptible to noise, thereby improving both measurement precision and reliability.
2Device complexity
If one rolling force detection value is used to calculate identification value, then calculation is simple, but large amount of accuracy deterioration occurs when abnormal value is mixed
Solution Approach 1:
The patent divides rolling force detection data into multiple segments corresponding to different rotation positions. This segmentation allows the system to accumulate multiple detection values at each position rather than relying on a single value, improving identification accuracy while maintaining manageable calculation complexity through systematic processing.
Solution Approach 2:
The patent creates multiple copies of detection data at different rotation positions and accumulates them. By generating and accumulating multiple data copies rather than using a single detection value, the system improves measurement precision while the structured accumulation process keeps calculation complexity acceptable.
3Duration of action of moving object
If abnormal values are included in accumulation, then accumulation process is continuous, but determination accuracy deteriorates due to noise signals
Solution Approach 1:
The patent extracts and removes abnormal values from the accumulation process. By detecting and excluding abnormal detection values caused by noise before accumulation, the system maintains continuous accumulation operation while improving measurement precision through selective data processing.
Solution Approach 2:
The patent converts the potential harm of abnormal values into benefit by using them as indicators for refinement. The accumulation process is used to identify and exclude abnormal values, transforming noise-induced abnormalities into opportunities for improving determination accuracy through selective data processing.
Data Source
AI summary
A roll state monitor device includes: rolling force detector configured to detect rolling force of a monitored roll selected from an upper roll set and a lower roll set; force variation value extractor configured to extract a rolling force variation value based on the rolling force for each rotation position of the monitored roll; and identification part configured to identify a roll eccentricity amount of the monitored roll by acquiring a plurality of accumulated values by accumulating separately for each rotation position of the monitored roll a value which is one of the rolling force variation value and a roll gap equivalent value calculated based on the rolling force variation value, and by dividing each of the plurality of accumulated values by a correction coefficient corresponding to a roll rotation amount.