ARAMIS - From 3D Measuring Data to Vibration Types

Calculation models show the type of vibration of parts. Measurements are carried out to help to understand which types of vibration are formed during operation of the part. GOM offers the sensor system for carrying out these measurements.

The ARAMIS 3D sensor is a stereo camera system and provides accurate 3D coordinates using the triangulation principle. The sensor measures 3D coordinates dynamically and provides measuring results such as strains, 3D displacements and 3D deformations. The 3D displacements captured with a high temporal resolution are used for the vibration analysis. The optical metrology offers many advantages for the vibration analysis such as:

  • Non-contact measuring principle
  • No wiring of accelerometers required
  • Fast setup and calibration of the sensor
  • Compact dimensions of the sensors
  • Ultra-light and lasting measurement targets
  • Synchronous measurement of many points in 3D – thus points can be measured also unsteadily
  • 3D displacement results for each measuring point

Depending on the application, measurements on the part are carried out in a point-based or full-field manner. To specify the type of vibration with the ARAMIS sensor, the excitation of the parts can be different. A simple harmonic excitation, an impact test or a rotating part during operation can be measured. The frame rate depends on the excitation. The ARAMIS SRX system of the ARAMIS sensor family has a maximum image recording rate of 335 Hz with a 12-megapixel resolution. In addition, by reducing the image height, the image recording rate can be increased up to 2000 Hz.

From the captured image data, surface components or point components are created. These components are inspected for 3D displacements over time.

For further vibration analysis, the 3D coordinates from the ARAMIS measurement can be exported in Universal File Format (UFF). This format is supported by most software packages for vibration analyses. Documented workflows exist already for ME’scope, BK Connect, PAK and NumPy.

For the first interpretation of the results directly after the test, the GOM Correlate Professional software offers also the possibility to display the types of vibration.

In the diagram at the top on the left, the envelope of the displacements of all points is displayed in Z-direction. The diagram at the bottom on the left shows the envelope of the frequency response of all points. The 3D diagram shows the corresponding type of vibration.

For more information on this topic, watch “GOM Webinar – Identifying Operational Deflection Shapes and Mode Shapes with Optical 3D Metrology”. The webinar recording is available on YouTube.

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