Normalized Transition Performance Index for Sheet Forming
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Solution Overview
Problem
Current process control systems for continuous processes, such as sheet forming, lack effective methods to quantify the performance of operating transitions, leading to inadequate data and significant production time and waste due to suboptimal grade changes.
Innovation Solution
A system and method that generates performance indices, including a transition time index, sheet weight ramp rate index, line speed change index, steam prediction error index, and moisture deviation index, which are weighted and summed to create an overall operating transition performance index, enabling comprehensive assessment and comparison of grade change performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional key performance indicators are used to monitor operating transitions, then monitoring is simple, but performance data is inadequate and cannot provide complete assessment of transition performance
Solution Approach 1:
The patent segments the overall transition performance into multiple specific performance indices (transition time index, sheet weight ramp rate index, sheet weight change index, line speed change index, steam prediction error index, moisture deviation index). Each index measures a specific aspect of transition performance, providing comprehensive and precise evaluation while maintaining manageable complexity through modular structure.
Solution Approach 2:
The patent transitions from single-dimension traditional KPI monitoring to multi-dimensional performance assessment by introducing six distinct performance indices that evaluate different aspects of transition performance simultaneously, enabling comprehensive assessment across multiple dimensions of process behavior.
2Measurement precision
If transition time is used as the sole metric for quantifying operating transition performance, then measurement is simple, but the assessment is incomplete and inaccurate
Solution Approach 1:
The patent divides the single transition time metric into six segmented performance indices, each capturing a specific dimension of transition behavior (time, weight ramp rate, weight change, line speed change, steam prediction error, moisture deviation). This segmentation provides accurate and comprehensive assessment while organizing complexity into manageable, focused measurements.
Solution Approach 2:
The patent expands from one-dimensional transition time measurement to six-dimensional performance assessment by adding indices for sheet weight ramp rate, sheet weight change, line speed change, steam prediction error, and moisture deviation, enabling accurate evaluation across multiple performance dimensions.
3Productivity
If operating transitions are carried out without optimized control, then process operation is simple, but substantial production time and product waste occur
Solution Approach 1:
The patent implements a feedback mechanism where six performance indices continuously monitor transition performance and feed this information back to the transition control system. This feedback enables real-time optimization of the transition process, reducing production time and waste by adjusting control parameters based on actual performance data across multiple dimensions.
Solution Approach 2:
The patent introduces dynamic optimization to the transition control system by continuously adjusting control parameters based on real-time performance data from six dynamic indices. This dynamic approach adapts to actual process conditions during transition, improving productivity by optimizing the transition path rather than following fixed predetermined procedures.
Data Source
AI summary
A system and method for generating indices to quantify operating transition performance of a continuous process, such as a sheet forming process, includes a computer system that is configured to generate a normalized overall transition performance index. The overall transition performance index is formed from a plurality of individual parameter indices associated with specific production components or portions of the process line. As such, the individual parameter indices allow a user of the system to readily identify the particular portion of the continuous process line that is performing below desired levels. In addition, because the overall transition performance index is normalized, it enables comparison of the operating transition performance of multiple process lines.