Metric Design – Signals to Features to Metrics

Automated metric-based assessment requires a metric design environment to explore algorithms that will isolate defect signatures and quantify them with well-behaved metrics. Shield simplifies this process to three steps where signals are reduced to features, features are reduced to metrics and metrics are used to build robust Pass/Fail limit tests.

Signals

Shield Signals 1
Shield is used to interactively define a configuration file that encapsulates all of the processing that will produce waveforms and metrics. Apply a user-defined configuration file to a compatible datafile and all results are computed automatically.

Complex dynamic signals are presented in a 3D time/frequency display where you can interactively explore signal details such as harmonics, resonance, and impulse behaviors.

Shield Signals 2
An RPM-restricted 7th order turbocharger blade-pass is extracted as a feature so it can be advanced to the Feature Tab for use in metric definition.

Use standard NVH analysis methods to build 2D waveforms such as order cuts, spectra, impulse indicators and other time or angle domain analysis features.

Features

Shield Features
A turbocharger blade-pass harmonic is subjected to a functional limit and shows a point of exceedance near 10,000 RPM. An out-of-limit list scaled in percentage over limit is reduced to the result as the mean out of limit value.

Extract the signal processing definition of important waveforms to the Feature Extraction List so they can be further processed into single-number metrics on the Feature Extraction Tab.

Metrics

Shield Metrics
This part fails because zero is the amount of exceedance allowed for a turbocharger blade-pass harmonic. A parallel test for a gear defect is also being evaluated and will also fail the part.

Metrics extracted from features are available on the decision tab to define Pass/Fail criteria against individual metrics.

Back to Shield home page
Learn about Shield metric deployment

Metric Design – Signals to Features to Metrics

Automated metric-based assessment requires a metric design environment to explore algorithms that will isolate defect signatures and quantify them with well-behaved metrics. Shield simplifies this process to three steps where signals are reduced to features, features are reduced to metrics and metrics are used to build robust Pass/Fail limit tests.

Signals

Shield Signals 1
Shield is used to interactively define a configuration file that encapsulates all of the processing that will produce waveforms and metrics. Apply a user-defined configuration file to a compatible datafile and all results are computed automatically.

Complex dynamic signals are presented in a 3D time/frequency display where you can interactively explore signal details such as harmonics, resonance, and impulse behaviors.

Shield Signals 2
An RPM-restricted 7th order turbocharger blade-pass is extracted as a feature so it can be advanced to the Feature Tab for use in metric definition.

Use standard NVH analysis methods to build 2D waveforms such as order cuts, spectra, impulse indicators and other time or angle domain analysis features.

Features

Shield Features
A turbocharger blade-pass harmonic is subjected to a functional limit and shows a point of exceedance near 10,000 RPM. An out-of-limit list scaled in percentage over limit is reduced to the result as the mean out of limit value.

Extract the signal processing definition of important waveforms to the Feature Extraction List so they can be further processed into single-number metrics on the Feature Extraction Tab.

Metrics

Shield Metrics
This part fails because zero is the amount of exceedance allowed for a turbocharger blade-pass harmonic. A parallel test for a gear defect is also being evaluated and will also fail the part.

Metrics extracted from features are available on the decision tab to define Pass/Fail criteria against individual metrics.

Back to Shield home page
Learn about Shield metric deployment

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CONNECT WITH US

YouTubeLinkedInNational InstrumentsControl System Integrators Association