IN-PLANE MODAL TESTING OF A FREE ISOTROPIC PLATE USING LASER DOPPLER VIBROMETER MEASUREMENTS

Journal Article · Fri May 28 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3455475· OSTI ID:21366748

Batista, F B; Fabro, A T; Coser, L F; Arruda, J R. F. ^[1]; Albuquerque, E L ^[2]

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1. Faculty of Mechanical Engineering, University of Campinas, Campinas, SP 13083-970 (Brazil)
2. Technological Faculty, University of Brasilia, Brasilia, DF 70910-900 (Brazil)

In this work an experimental procedure is proposed to obtain the lowest free in-plane vibration modes of an aluminum plate. Responses are measured along two longitudinal directions on the plate surface at selected points by an out-of-plane laser Doppler vibrometer set up to measure in-plane vibrations. Excitation is made at one specific point of the plate edge using a light impact hammer. The plate is supported by silicone spheres to simulate the free edge boundary conditions and ensure a stable stationary position in order to keep the laser focus distance. Numerical finite element simulations are carried out to compute the in-plane modes and frequencies in order to compare them with the corresponding experimental results. The identified experimental modes agree very well with the numerical predictions. The smooth in-plane modes can be used to identify the plate material constitutive model parameters using existing methods proposed elsewhere by the authors.

• OSTI ID: 21366748
• Journal Information: AIP Conference Proceedings, Vol. 1253, Issue 1; Conference: 9. international conference on vibrational measurements by laser and non-contact techniques and short course, Ancona (Italy), 22-25 Jun 2010; Other Information: DOI: 10.1063/1.3455475; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM
BOUNDARY CONDITIONS
EXCITATION
FINITE ELEMENT METHOD
FREQUENCY MEASUREMENT
LASERS
OSCILLATION MODES
PLATES
SILICONES
SIMULATION
SPHERES
CALCULATION METHODS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
MATHEMATICAL SOLUTIONS
METALS
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
POLYMERS
SILOXANES