Anomaly Detection and Structural Analysis in Industrial Production Environments
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1 Anomaly Detection and Structural Analysis in Industrial Production Environments David Arnu 1, Martin Atzmüller 2, Andreas Schmidt 3 1 RapidMiner GmbH, 2 Tillburg University, 3 University of Kassel idsc 2017 Salzburg, Austria
2 A Reference Architecture for Quality Improvement in Steel Production Edwin Yaqub, David Arnu
3 Research Project FEE Frühzeitige Erkennung und Entscheidungsunterstützung für kritische Situationen im Produktionsumfeld Heterogeneous Mass data Big Data Analysis Support System Objective: Operator Support functions Early Warnings Ad-hoc Analysis Decision Support Approach: Integrated Analysis of all plant data Operator - 3 -
4 asa asa asa asa Head 2013: 11: er : 04 : 11: 2013: 12: : : 11: 12: : : : 11: 12: : FEE Data and System Landscape Engineering Data Laboratory Data Big Data Platform Assistence Systems Early Warnings Anomaly Detection & Scenario Search Ad-hoc-Analysis & Prognosis Alarms & Events Head er 1 : 12: 5 4: 40 Asset Data Head er 3 Process Measurements Operation Manuals Interactive Usage Early Warning Learning from History Production Plant Digital Shift Book Operators - 4 -
5 Anomaly Detection in Process Industry Very few critical events Drift of concepts (process parameters, system changes) Two data sources sensor readings alarm messages Two stakeholders Operator: continuously monitoring the plant; has to react to sudden changes Process engineer: monitors overall trends; long term observations - 5 -
6 Industrial Plant - Alarm Patterns Set of assets (part of a plant) Each asset contains a set of measurements Value range is monitored to trigger alarms Sequence of alarms grouped by asset Snapshot of an abstract state of the plant Model and compare these states - 6 -
7 Industrial Plant - Alarm Patterns Set of assets (part of a plant) Each asset contains a set of measurements Value range is monitored to trigger alarms Sequence of alarms grouped by asset Snapshot of an abstract state of the plant Piping and Instrumentation Diagram (P&ID) Model and compare these states By Con-struct - Own work, CC BY-SA 3.0, -
8 HypGraphs - Graph-Based and Sequential Hypotheses First-Order Markov Chain modeling: Model transitions between different states Given a probability distribution on certain events (e.g., on alarms on different sub-parts of a plant) Determine transition model Collect transition matrix Compare with hypotheses - 8 -
9 HypGraphs (2) Transition Matrix Estimation Algorithm Hypothesis 1 Data Hypothesis 2 Estimation Score - 9 -
10 Exceptional Sequential Link Trails Construction of the transition matrix: Graph constructed from alarm sequences Considering subplant subplant relations extracted from the P&IDs Anomaly detection/analysis: Situations can be evaluated using Bayes factors analysis Comparing data to model hypothesis (normal behavior) and a random one (lower bound)
11 Exceptional Sequential Link Trails (2) Weighted Network/ Graph Transition Matrix Normal behavior Data Estimation Anomaly 1 Hypothesis 1 Analysis, Presentation Anomaly n Hypothesis n
12 RapidMiner Workflow for HypGraphs Running HypGraphs with different settings for k Varying tolerance factor k of the estimation algorithm Algorithm implemented as RapidMiner extension, available at: GitHub
13 HypGraphs - Visualization
14 Anomaly Detection on Sensor Data The distance between a live data time-series and the most similar subsequence from historical database is used to calculate the anomaly score. Live time-series Q Database time-series DB Time Series Transformation Sliding Window W Representation Distance/ Similarity Evaluation Dist(Q,W) Anomaly Score
15 Uni- and Multivariate Anomaly Scores
16 Comparing HypGraphs and Local-Outlier-Factor HypGraphs Evidence Local Outlier Factor
17 Conclusion Two approaches for anomaly detection in industrial enviroments HypGraphs: new method for analysing sequential & graph based data Anomaly scores of sensor data References: Atzmüller, M. ; Schmidt, A. ; Klöpper, B. ; Arnu, D.: HypGraphs: An Approach for Analysis and Assessment of Graph-Based and Sequential Hypotheses. In: New Frontiers in Mining Complex Patterns, Postproceedings NFMCP 2016 RapidMiner HypGraphs extension:
18 ANOMALY DETECTION AND STRUCTURAL ANALYSIS IN INDUSTRIAL PRODUCTION ENVIRONMENTS David Arnu Web: darnu@rapidminer.com rapidminer.com RapidMiner GmbH Westfalendamm Dortmund Germany RapidMiner, Inc. 10 Fawcett St., 5th Floor Cambridge MA United States
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