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A blisk with a reference frame during the optical 3D scanning with fringe projection.

Blisk dynamic
measurement chain

From geometry to mode shapes

Explore how optical 3D scanning, digital image correlation, and finite element analysis connect as-measured geometry with modal characterization.

Download the whitepaper

As aerospace components remain in service longer and maintenance requirements grow more complex, engineers need a more complete understanding of how manufacturing deviations, wear, damage, and repair activities affect structural-dynamic behavior. Traditional modal analysis workflows often rely on nominal CAD models that may not fully represent the geometry of the component being evaluated.

This whitepaper examines a measurement chain that connects as-measured geometry, optical metrology, and vibration analysis to support a more realistic assessment of blisk dynamics. By combining digital image correlation (DIC), optical 3D scanning (O3D), and finite element analysis (FEA), engineers can investigate the relationship between surface geometry and mode-shape behavior using data from the actual component rather than an idealized design model.

This approach introduces the concept of a geometric digital twin for structural-dynamic characterization. This enables consideration of geometric deviations, damage features, and manufacturing variations that may affect modal performance. The whitepaper explores how full-field optical measurement technologies can be integrated into existing aerospace workflows spanning development, testing, quality assurance, production, and maintenance, repair, and overhaul (MRO).

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Explore how optical metrology technologies are being applied to bridge the gap between geometry acquisition, digital twin creation, and modal analysis for damaged and service-exposed blisks.
Vibration test setup with digital image correlation (DIC). High-speed stereo cameras capture full-field vibration behavior during modal impact testing, enabled by a stochastic surface pattern.

In this whitepaper, uncover valuable insights including:

  • Why nominal CAD geometry may not fully represent the dynamic behavior of damaged blisks and how as-measured geometry can support modal analysis.
  • How optical 3D scanning, digital image correlation (DIC), and finite element analysis (FEA) can be integrated into a single measurement chain from geometry acquisition to mode shape evaluation.
  • How geometric digital twins can support aerospace engineering workflows spanning development, quality assurance, testing, and maintenance, repair, and overhaul (MRO).

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