Mode forms of a rectangular plate: comparison of digital holographic measurements and HPFEM analysis

Philipp Froening; Giancarlo Pedrini; H. Fessler; Hans J. Tiziani; P. H. Kulla; W. Reinprecht

doi:10.1117/12.307695

1 June 1998 Mode forms of a rectangular plate: comparison of digital holographic measurements and HPFEM analysis

Philipp Froening, Giancarlo Pedrini, H. Fessler, Hans J. Tiziani, P. H. Kulla, W. Reinprecht

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307695
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

Digital holographic interferometry has established as a readily available technique for measurement of surface deformations. In the method images containing the deformation of a surface as continuous function of high precision and fine resolution are obtained by computer subtraction of different holograms. On the other hand, the high precision finite elements method can be used to compute the deformation fields of elastic continua, where the resolution is similar to the resolution obtained with digital holographic interferometry. Combining both techniques, an attractive concept for testing is obtained: instead of performing FEM analysis in an isolated effort, it can be handled in parallel to the tests and preferably by the same personnel. This gives the opportunity for true interactive work, what may considerably ease the problem of harmonizing test and analysis. In order to demonstrate these features, a series of the first 45 modeforms of a rectangular plate are measured and computed. The plate is harmonically excited by a loudspeaker. Two separate digital holograms of the whole plate are recorded on a CCD sensor at each resonant frequency. Measured and computed modeforms are presented under identical format.

Citation Download Citation

Philipp Froening, Giancarlo Pedrini, H. Fessler, Hans J. Tiziani, P. H. Kulla, and W. Reinprecht "Mode forms of a rectangular plate: comparison of digital holographic measurements and HPFEM analysis", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307695

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