Structural dynamics measurements

The CEVAA carries out structural dynamics measurements. We have extensive experience in the vibration measurement of structures to make a system more reliable or to validate its design.

Vibration measurement of structures

The CEVAA has 1D and 3D accelerometers as well as two 3D laser vibrometers (a PSV 400 and a PSV 500-Xtra). These different means allow the measurement for various cases:

• Modal analysis in free-free or measurement on a test plate using an impact hammer, a piezoelectric shaker, or a vibrating pot
• Measurement on an electrodynamic vibrator from 1kN to 125kN, for various excitation profiles (sine sweep, random, resonance frequency tracking (sine-Dwell), reproduction of time signals)
• Operational measurement (example: on a running engine, or on-road measurements)

All this on more or less large structures (from a microcomponent presenting an electronic card to a locomotive), and more or less complex (an airplane propeller to an electric motor).

Correlation calculations / tests

Vibration measurements associated with simulation (one of CEVAA’s skills) allow a calculation/test correlation, including in particular:

• Digital model registration,
• Realization of MAC (Modal Assurance Criterion) between the tests and the calculation,
• Comparison of strain/stress field mapping in dynamics between calculation and tests.
• Making of a digital twin

The purpose of this calculation/test correlation is, on the one hand, to validate the numerical model from the tests and, on the other hand, to acquire a reliable model in order to iterate on the design of a product for materials which can be non-isotropic such as composites or parts from metal additive manufacturing.