A forced vibration shaker test was conducted on an oil production plattform located near the Mississippi delta 325 ft of water. Two shakers, each consisting of 3000-lb blocks of steel driven by hydraulic rams, were attached to the deck of the structure and used to determine the force to displacement transfer functions for the first few natural modes of the structure in flexure and torsion. In addition to the well known methods of sine sweep and random excitation, the structure was excited by a pseudo-random force. The theory of pseudo-random vibration testing is presented. Pseudo-random time sequences are shown to be extremely simple to generate, including ones whose spectra contain substantial low frequency energy, such as required in the testing of an offshore plattform. The design of a portable pseudo-random sequence generator is provided. It may be easily modified and applied to other forced vibration tests. The results of the field tests are shown. (Kursetz)
A pseudo-random noise tenerator for dynamic response testing of offshore structures
Ein Generator zur Erzeugung von Schein- oder Zufallsgeraeuschen zur dynamsichen Pruefung des Verhaltens von Kuestenvorfeldbauwerken
ASME-Papers ; 1-8
1979
8 Seiten, 12 Bilder, 1 Tabelle, 5 Quellen
Aufsatz (Konferenz)
Englisch
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