Experimental modal analysis
Modal analysis consists in studying the elementary characteristics of deformation of a mechanical structure.
Modal analysis on complete vehicles or sub-assemblies
- Artificial excitation: Impact hammer, Vibrating pots, etc.
- Piezoelectric excitations, sound sources
- Answer: Tri-axial accelerometers (96 simultaneous channels), or 3D scanning laser vibration meter.
The CEVAA is able to predict the in-service vibration behavior of a mechanical structure under artificial or real stress. Modal analysis also makes it possible to determine the structural characteristics (natural frequencies, modal deformations, damping) and to readjust finite element calculation models.
Modal analysis objectives
- Visualize the eigenmodes of the structures and readjust the finite element models
- Characterize the dynamic behavior of mechanical structures, equipment and materials
- Identify resonance phenomena that could damage the mechanical structure
Modal analysis tools
- Dedicated LMS TestLab software
- Excitation by vibrating pots or piezoelectric cells
- Mesh by 3D digitizer (geometry)
- FRF measurements by 3D Scanning Laser Vibrometry or 3D accelerometers
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