Valve Positioner Digital Twin for Interpretable Fault Diagnostics
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Solution Overview
Problem
Current digital valve controllers in the process industry lack the ability to provide straightforward and interpretable diagnostics, requiring expert analysis to determine when a control valve will fail and which parts need service or replacement, despite offering historical trends and diagnostics reports.
Innovation Solution
A valve positioner with a microprocessor system that includes an embedded valve controller and a tracking digital twin, utilizing simulation model parameters to detect and identify specific physical faults in real-time, predict future trends, and estimate the remaining operation time of valve components, by tracking errors between simulated and actual measurements and adjusting fault-related parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If digital valve controllers provide historical trends and diagnostics reports, then diagnostic data is available, but expert analysis is required and interpretation remains difficult
Solution Approach 1:
The patent creates a digital twin (virtual copy) of the physical valve assembly that replicates its behavior and characteristics. This digital model processes sensor data and simulates valve operation, enabling automated diagnostic analysis without requiring expert interpretation of raw historical data. The digital twin copies the essential dynamics and fault signatures of the physical system.
Solution Approach 2:
The digital twin acts as an intermediary between the physical valve assembly and the diagnostic system. It receives raw sensor measurements from the physical system, processes them through simulation models, and outputs interpreted diagnostic information about valve health and potential failures, eliminating the need for experts to directly analyze complex historical trends.
2Speed
If smart positioners use position control algorithms, then dynamic response is improved, but device complexity increases
Solution Approach 1:
The digital twin serves multiple functions: it acts as a diagnostic tool for fault detection, a training platform for operators, and a simulation environment for testing control strategies. This multi-functionality justifies the additional computational complexity by providing substantial operational benefits beyond simple position control.
Solution Approach 2:
Instead of increasing the complexity of the physical positioner hardware, the patent creates a virtual copy (digital twin) that handles complex simulations and diagnostics. This keeps the physical device relatively simple while achieving advanced functionality through the computational model.
3Reliability
If valve diagnostics data is collected, then fault information is available, but expert knowledge is needed to analyze the data
Solution Approach 1:
The digital twin performs self-diagnosis by automatically comparing simulated valve behavior with actual sensor measurements. It identifies discrepancies that indicate faults and provides interpretable diagnostic information without requiring external expert analysis. The system serves itself by monitoring its own health status through the digital model.
Solution Approach 2:
The system continuously compares the digital twin's simulated outputs with actual sensor measurements from the physical valve assembly. This feedback loop enables automatic detection of deviations that indicate faults, providing real-time diagnostic information that is immediately interpretable without expert intervention.
Data Source
AI summary
Fault diagnostics utilize an embedded tracking digital twin of a valve assembly physical part in a microprocessor system of the valve positioner. The digital twin has simulation model parameters including a fault-related simulation model parameter. The digital twin receives a control signal representing a real control of the at least part of the valve assembly, and generates simulated measurements relating to the simulated control result. The digital twin compare the simulated measurements with real measurements that relate to the real control result, to track an error between the results of simulated operation and the real operation of the valve assembly to adjust the fault-related simulation model parameter in a sense that the error is decreased. The fault-related simulation model parameter relates to a specific physical fault in the physical part of the valve assembly, and it is detectable and identifiable based on the simulation model parameter adjusted value.