Machine Anomaly Monitoring by Operating-Point Clustering

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Solution Overview

Problem

Existing methods for monitoring motor applications, such as pumps and fans, fail to consider operating points and environmental constraints, leading to late or undetected faults, increased downtimes, and inefficient maintenance.

Innovation Solution

A method involving a training phase to cluster operating points and train anomaly recognition models using unsupervised algorithms like artificial neural networks, which calculate anomaly characteristic values to detect and isolate faults, and an application phase to recognize anomalies and provide recommendations for adjusting operating conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If general vibration monitoring is applied across all operating points, then monitoring coverage is achieved, but fault detection precision deteriorates due to operating point variations

Engineering Contradiction:
Improvemonitoring coverageVSAvoidfault detection precision
Core Design Contradiction:
ReliabilityVSMeasurement precision

Solution Approach 1:

The patent segments the continuous operating space into discrete operating-point clusters based on similarity metrics. Each cluster represents a group of similar operating conditions, allowing monitoring to be tailored to specific operating points rather than applying a single general threshold across all conditions. This segmentation enables precise fault detection within each cluster while maintaining comprehensive coverage across the entire operating range.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by creating operating-point-specific monitoring characteristics and thresholds for each cluster. Instead of using uniform monitoring parameters globally, the system adapts the monitoring criteria to local operating conditions. Each operating-point cluster has its own anomaly recognition model trained on locally relevant data, improving detection precision for faults occurring under specific operating conditions.

Inventive Principle:
Principle #3Local quality

2Measurement precision

If operating point-specific monitoring is implemented, then fault detection precision improves, but system complexity increases due to multiple monitoring models

Engineering Contradiction:
Improvefault detection precisionVSAvoidsystem complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements universality by creating a unified clustering framework that groups operating points based on their similarities. The same clustering algorithm and anomaly recognition approach are applied across all operating-point clusters, providing a universal methodology that handles diverse operating conditions. This multi-functional system can adapt to any operating point by assigning it to the appropriate cluster, avoiding the need for completely separate monitoring systems for each operating point.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses parameter changes by dynamically adjusting monitoring thresholds and characteristics based on the identified operating-point cluster. The system changes its monitoring parameters according to the current operating conditions, selecting appropriate thresholds and anomaly criteria from the trained models corresponding to the active cluster. This allows precise fault detection adapted to local conditions without requiring manual configuration for each operating point.

Inventive Principle:
Principle #35Parameter changes

3Ease of manufacture

If manual limit configuration based on standards is used, then implementation simplicity is maintained, but adaptability to different operating points deteriorates

Engineering Contradiction:
Improveimplementation simplicityVSAvoidadaptability to operating points
Core Design Contradiction:
Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent implements self-service by enabling the monitoring system to automatically adapt to different operating points through unsupervised clustering and automated model training. The system performs self-configuration by identifying operating-point clusters from operational data and training appropriate anomaly recognition models without requiring manual intervention. This automated approach maintains implementation simplicity while achieving high adaptability to varying operating conditions.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent applies dynamics by creating a flexible monitoring system that can dynamically adjust to changing operating conditions. The clustering framework allows the system to automatically reorganize operating-point groups as new operating conditions are encountered, and the anomaly recognition models can be retrained to adapt to evolving operational patterns. This dynamic capability enables the system to maintain simplicity while being highly adaptable to different and changing operating points.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS20240337566A1Method for monitoring a machine, computer program product and arrangement
Publication Date: 2024.10.10 SIEMENS AG
  • US20240337566A1 patent drawing

AI summary

The invention relates to a method (PRC) for monitoring the operation of a machine (MCH), in particular of a motor (ENG) or electrically driven motor (EEG). To improve the monitoring, the method proposes a method of this type comprising the following steps: c) training phase (TPH): i. providing training data (TDT) comprising state variables (PHC) of multiple operating points (OPP) of the machine (MCH), ii. recognizing and combining operating points (OPP) in the training data (TDT) through clustering (CLS) to form operating-point clusters (OCL), i. training a classifier (CLF), which assigns operating points (OPP) to the recognized operating-point clusters (OCL), iv. training an anomaly recognition model (ARM) for recognizing operating anomalies, d) application phase: i. recording operating data (OPD) comprising state variables (PHC) of operating points (OPP) of the machine (MCH) in an operating state, ii. assigning the operating data (OPD) to the operating-point clusters (OCL) using the classifier (CLF), recognizing operating anomalies using the anomaly recognition model (ARM).