Time-Series Measurement Recording for DTW-Based Quality Prediction

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Solution Overview

Problem

Current systems for monitoring the quality of a target's state, such as a facility, face challenges in accurately determining the quality using time-series measurement data due to limitations in data alignment and threshold setting for anomaly detection, leading to inefficiencies in predicting future states.

Innovation Solution

A measurement data recording apparatus and a generation apparatus work together to acquire, process, and transmit time-series measurement data, using dynamic time warping (DTW) and learning processing to generate a determination model that aligns data and sets thresholds, enabling accurate quality determination and anomaly detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If time-series measurement data is used to determine quality of target state, then predictive capability is improved, but data alignment accuracy deteriorates

Engineering Contradiction:
Improvepredictive capabilityVSAvoiddata alignment accuracy
Core Design Contradiction:
ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by performing dynamic time warping (DTW) alignment on historical measurement data before generating the determination model. This preprocessing step aligns the time-series data in advance, ensuring that when the model is used for prediction, the data is already properly synchronized, thus resolving the contradiction between predictive capability and alignment accuracy.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent introduces DTW as an intermediary mechanism between raw time-series data and the determination model. This intermediary process transforms misaligned data into aligned data through warping, allowing the model to receive properly synchronized input without requiring real-time alignment during prediction, thereby maintaining both predictive speed and alignment accuracy.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Measurement precision

If dynamic time warping is used to align measurement data, then data alignment accuracy is improved, but processing complexity increases

Engineering Contradiction:
Improvedata alignment accuracyVSAvoidprocessing complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs DTW alignment as a preliminary action during the offline model generation phase rather than during online prediction. This allows the computationally intensive alignment process to be completed in advance when computational resources are available, reducing the processing complexity during real-time operation while maintaining high alignment accuracy in the generated model.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by using DTW to create a dynamic alignment that adapts to the specific characteristics of each dataset. The warping function is dynamically determined based on the actual time distortions present in the data, allowing the system to handle variable processing requirements while maintaining accuracy, and the aligned model can then be reused multiple times with reduced processing complexity.

Inventive Principle:
Principle #15Dynamics

3Measurement precision

If determination model is generated using learned data, then determination accuracy is improved, but model validity verification becomes more difficult

Engineering Contradiction:
Improvedetermination accuracyVSAvoidmodel validity verification
Core Design Contradiction:
Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements feedback by incorporating a validity verification step that uses the same determination model to verify its own outputs. The system checks whether determination results fall within expected ranges and provides feedback on model performance, allowing continuous monitoring of model validity while maintaining high determination accuracy through the learned parameters.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent performs preliminary validation by generating the determination model with built-in validity checks during the offline training phase. The model is trained to recognize not only accurate patterns but also the boundaries of valid predictions, so when deployed, the model can self-verify its outputs without requiring complex external validation mechanisms, thus maintaining accuracy while simplifying validity detection.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentEP4053661B1Measurement data recording apparatus, method, and program
Publication Date: 2023.11.01 YOKOGAWA ELECTRIC CORP
  • EP4053661B1 patent drawingFigure 1
  • EP4053661B1 patent drawingFigure 2
  • EP4053661B1 patent drawingFigure 3

AI summary

Provided is a measurement data recording apparatus (4) including: an acquisition portion (40) configured to acquire time-series measurement data obtained by measuring a state of a target (2); a recording portion (41) configured to record the acquired measurement data; a measurement data transmission portion (451) configured to transmit the measurement data recorded in the recording portion (41) to a generation apparatus (5) configured to generate a determination model (431) for determining a quality of the state of the target; a model reception portion (452) configured to receive the determination model generated by the generation apparatus; and a determination portion (48) configured to determine the quality of the state of the target from newly acquired measurement data using the received determination model.