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|Title:||Experimental comparison of prototype and 1:5-scale model wicket gates|
|Authors:||United States. Army. Corps of Engineers. Louisville District.|
Chowdhury, Mostafiz R.
Ross, Douglas G.
Hall, Robert L.
Experimental modal analysis
Olmsted Locks and Dam
|Publisher:||Structures Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-97-5.|
Abstract: Experimental results for the prototype and 1:5-scale physical model were compared to determine the effectiveness of the scaled model in predicting the structural and hydraulic responses of the Olmsted wicket. Limited capabilities of the prototype experiments at the Smithland prototype facility demanded the physical model studies program at the U.S. Army Engineer Waterways Experiment Station in support of the development of an analytical model. A direct correlation of the dry natural dynamic characteristics and the flow-induced structural responses of the prototype and scaled model increased the confidence of the scaled model for further examination of the flow-induced response pattern of the Olmsted dam for various flow and operating configurations. A very good correlation between the corresponding mode shapes indicated the structural similarity of the prototype and scaled model. Flow-induced time-domain model and prototype responses for identical flow configurations corresponded very well in most cases. Inconsistencies were noted in hinge force data, which was attributed to incorrect placement of hinge force transducers. A time-scale factor was computed to adjust the kinematic dissimilarity of the prototype wicket. An improved correlation of acceleration and pressure data for both prototype and scaled model was obtained in the frequency domain. The composite gate has a much greater vibratory response than the prototype steel gate under similar operating conditions. NOTE: This file is large. Allow your browser several minutes to download the file.
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