FIELD TEST VALIDATION OF ANALYTICAL MODEL FOR VIBRATION CHARACTERISTICS OF A FLAP GATE UNDERGOING SELF-EXCITED VIBRATION

An experimental modal analysis, using an impact hammer and accelerometers, was conducted on a full-scale flap gate with a height of 0.963 m and a span of 14.8 m to determine its in-air natural frequencies, mode shapes, and modal damping. Subsequently, the in-water self-excited vibration characterist...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:International Journal of Mechanical Engineering and Robotics Research 2014-10, Vol.3 (4), p.1-1
Hauptverfasser: Anami, Keiko, Ishii, Noriaki, Knisely, Charles W, Matsumoto, Yukio
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:An experimental modal analysis, using an impact hammer and accelerometers, was conducted on a full-scale flap gate with a height of 0.963 m and a span of 14.8 m to determine its in-air natural frequencies, mode shapes, and modal damping. Subsequently, the in-water self-excited vibration characteristics of the gate (without any spoilers) were recorded using the same accelerometers. The major in-air vibration characteristics (the mode shape, frequency and damping ratio for the damped vibrations), as well as the major in-water self-excited vibration characteristics (the excitation ratio and frequency of the self-excited vibrations in-water) are tabulated. In parallel with these experiments, calculations of the inherent in-water vibration frequency of the gate using a potential flow theory, based on input from the in-air modal testing, are presented. Comparison of the calculated inherent in-water vibration frequency with the measured frequency of the in-water self-excited vibration confirms the validity of the present theoretical analysis.
ISSN:2278-0149