Abstract
A structure dynamic model of an airplane fin built by Saab-Scania, Sweden, has been vibration tested by the holographic time-average technique. The investigation was performed at Volvo-Flygmotor, Sweden, in their vibration laboratory. Holograms were made at every resonance frequency and, in all, eleven different patterns were created in the interval from 0 to 3 400 Hz. The inner structure of the fin model was revealed by inducing a temperature difference between the two exposures of a double-exposed hologram.
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