Test-to-model correlation

Mechanical model validation with geometry-linked UFF data

Export XYZ geometry, tri-axial velocity waveforms and frequency response functions (FRFs) in one UFF file. Import the test model directly into your modal-analysis workflow and compare measured and predicted response.

Every waveform and FRF remains tied to its measurement point and direction, ready for mode-shape animation, FRF overlays, MAC, COMAC and model updating.

One UFF handoff

One file carries the test geometry, response directions and dynamic data.

Geometry, waveforms and FRFs

XYZ coordinates, tri-axial velocity waveforms and FRFs remain associated with each measurement record.

Experimental modal analysis

A direct path from test to FE correlation

Experimental modal analysis compares natural frequencies, mode shapes, damping and FRF magnitude and phase on a geometry-aware test model. The UFF export removes the reconstruction step between measurement and correlation.

1. Define

Set the geometry, test points, response directions and excitation reference.

2. Measure

Capture dense non-contact velocity data and combine it with force, acceleration, displacement or strain references.

3. Correlate

Review modes, frequency and damping estimates, FRF overlays, MAC, COMAC and other correlation indicators.

4. Update

Focus the model on the joints, boundaries, material properties and local stiffness that drive the mismatch.

Geometry-aware data

Keep response location and direction intact

Separate geometry, channels and direction definitions force analysts to rebuild the test model before correlation begins. A coherent UFF handoff avoids that work.

Ommatidia exports XYZ geometry coordinates, tri-axial velocity waveforms and FRFs linked to the same measurement points.

Link point and response

Geometry and response records arrive together, so channels do not need to be reconstructed against coordinates.

Preserve direction

XYZ output identifies the response direction at each test degree of freedom.

Start analysis sooner

Import the test model and move into visualisation, parameter estimation and correlation.

Dense measurement coverage

See the regions that drive the mismatch

Model differences often sit at a joint, rib, bonded interface, mounting feature, cut-out or boundary. Dense measurement points reveal local response on complex structures and compact components without sensor mass or cabling shaping the test.

Complex structures

Cover panels, assemblies, frames and larger structures with the spatial detail needed to interpret the measured response.

Small components

Measure local mode shapes where conventional sensor placement is intrusive, impractical or too sparse.

Local response

Measure small features without a dense sensor array

Coils, power-electronic assemblies, fasteners, bonded regions and compact substructures can carry local behaviour that a sparse grid misses. Geometry-linked tri-axial velocity data shows that response without loading the test article with sensors.

Built for hybrid test setups

Use Laser RADAR for coverage and retain the complete test model

Laser RADAR supplies dense non-contact response measurements. Pair it with impact-hammer or shaker forces, accelerometers, displacement probes, strain sensors and operational references as the test requires. Ommatidia places the measured vibration field into that wider test model.

UFF export

Transport test geometry and structural-dynamics data into the modal and correlation environment your team uses.

Geometry-aware review

Open a test model with points, directions, waveforms and FRFs linked before animation or correlation begins.

Your analysis workflow

Keep your existing analysis package, naming conventions and validation criteria.

Continue the workflow

Resources for the next model-validation decision

Move from test planning into a proven workflow, a comparable application or the measurement platform that fits the structure.

Full-field modal-analysis workflow guide

Follow the end-to-end workflow from excitation and FRF acquisition through curve fitting, MAC review and UFF export.

Impact-test application note

See an impact-hammer test on a concrete slab using 65 simultaneous response measurements and geometry context.

PCB vibration application note

Explore high-density response measurement on populated electronics where local component behaviour drives qualification risk.

Choose the measurement system

Products and application context

Q2 Laser RADAR

For complex parts, dense dynamic coverage and integrated 3D geometry in one measurement workflow.

Q1 Laser RADAR

For large or difficult-to-access structures that need stand-off geometry capture and vibration insight.

Acoustics, noise and vibration applications

Browse vibration, modal-testing and NVH applications by engineering question, structure and measurement constraint.

Questions from model-validation teams

Practical answers before you plan the test

Que contient un export UFF Ommatidia ?

L’export peut conserver géométrie, coordonnées et résultats vibratoires Q-Series pour des outils compatibles, y compris réponse et FRF lorsque l’essai fournit la référence d’entrée requise. Confirmez le jeu UFF, les unités, la convention de coordonnées et les besoins de l’outil récepteur pour la version et le flux.

Qu’est-ce qu’une fonction de réponse en fréquence (FRF) ?

Une FRF relie la réponse structurelle mesurée à une entrée mesurée selon la fréquence. Dans un essai modal au marteau ou pot vibrant, elle aide à identifier les résonances, estimer les paramètres modaux et comparer l’essai au modèle éléments finis. Un spectre de sortie seul n’est pas automatiquement une FRF.

Le Laser RADAR peut-il être utilisé dans un essai modal au marteau ?

Oui, si la force du marteau est acquise comme référence d’entrée alignée temporellement et si le Laser RADAR enregistre la réponse sur la géométrie choisie. Déclenchement, temps, directions, bande, fenêtrage et qualité de force doivent être maîtrisés avant calcul ou export des FRF.

Que faut-il aligner avant de corréler essai et modèle EF ?

Alignez système de coordonnées, points, directions de réponse, unités, conditions aux limites et d’exploitation, plage de fréquence et grandeur comparée. Une correspondance claire rend interprétables les écarts de fréquence propre, amortissement, forme modale et FRF au lieu d’artefacts de montage.

Le flux soutient-il corrélation et mise à jour du modèle EF ?

Oui. Les ingénieurs peuvent examiner FRF ou paramètres modaux mesurés, les comparer aux prédictions et guider les mises à jour avec les écarts. Le logiciel ne valide ni ne met à jour automatiquement le modèle ; choix des paramètres, critères et interprétation restent dans l’analyse.

Un fichier UFF remplace-t-il le logiciel d’analyse modale ?

Non. UFF est un format d’échange qui accélère le transfert de géométrie et données compatibles. Identification modale, corrélation, mise à jour, revue des incertitudes et rapport exigent toujours un logiciel adapté, une méthode définie et un jugement d’ingénierie qualifié.

Plan the correlation test

Build the measurement plan around the model decision

Tell us the structure, expected modes, test environment and analysis workflow. We will help define the coverage and data handoff needed for your correlation work.