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A refined finite element for vibration analysis of twisted blades based on beam theoryA finite element method of discretizing beam segments of pretwisted rotating blades is presented. Employing the matrix displacement method, stiffness and mass properties are developed from basic mechanics of a pretwisted beam theory. By introducing the proper displacement functions, the effect of rotor blade rotational motion on the stiffness matrix is obtained systematically from the kinetic energy expression. Comparing with other beam elements the derivation of this element is more fundamental. This allows one to apply the same approach to more complicated problems including nonlinear effects or complex dynamic motions. Illustrative examples are given comparing numerical results with available data and other numerical solutions from rotating and nonrotating force fields. These examples show that accurate prediction of vibration frequencies for pretwisted blades can be obtained by employing a quite modest number of degrees of freedom.
Document ID
19830048627
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sisto, F.
(Stevens Inst. of Tech. Hoboken, NJ, United States)
Chang, A. T.
(Stevens Institute of Technology Hoboken, NJ, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Structural Mechanics
Report/Patent Number
AIAA PAPER 83-0917
Meeting Information
Meeting: Structures, Structural Dynamics and Materials Conference
Location: Lake Tahoe, NV
Start Date: May 2, 1983
End Date: May 4, 1983
Accession Number
83A29845
Distribution Limits
Public
Copyright
Other

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