Journal ArticleDOI
Rotating Blade Vibration Analysis Using Shells
TLDR
Shallow shell theory and the Ritz method are employed to determine the frequencies and mode shapes of turbomachinery blades having both camber and twist, rotating with non-zero angles of attack as discussed by the authors.Abstract:
Shallow shell theory and the Ritz method are employed to determine the frequencies and mode shapes of turbomachinery blades having both camber and twist, rotating with non-zero angles of attack. Frequencies obtained for different degrees of shallowness and thickness are compared with results available in the literature, obtained from finite element analyses of nonrotating blades. Frequencies are also determined for a rotating blade, showing the effects of changing the (1) angular velocity of rotation, (2) disk radius and (3) angle of attack, as well as the significance of the most important body force terms.read more
Citations
More filters
Journal ArticleDOI
Vibration studies for laminated composite twisted cantilever plates
Mohamad S. Qatu,Arthur W. Leissa +1 more
TL;DR: In this article, the first known natural frequencies and mode shapes of the title problem were presented using the Ritz method with algebraic polynomial displacement functions, and convergence studies were made which demonstrate that accurate results were obtained using 144 displacement terms.
Journal ArticleDOI
Natural frequencies for cantilevered doubly-curved laminated composite shallow shells
Mohamad S. Qatu,Arthur W. Leissa +1 more
TL;DR: In this paper, the Ritz method with algebraic polynomial displacement functions is used to analyze free vibrations of thin cantilevered laminated plates and shallow shells having rectangular planforms.
Journal ArticleDOI
Natural frequencies of twisted rotating plates
V. Ramamurti,Robert E. Kielb +1 more
TL;DR: In this paper, a detailed comparison of the predicted eigenfrequencies of twisted rotating plates as obtained by using two different shape functions is presented, and results of a brief study of cambered plates are presented.
Fluid/structure coupled aeroelastic computations for transonic flows in turbomachinery
TL;DR: The results show that the unsteady pressure generated at the shock may act to damp or excite the blade motion mainly depending on the inter-blade phase angle, and it is concluded that the level of sophistication in the individually sophisticated disciplines together with an accurate coupling interface will allow for accurate prediction of flutter boundaries of turbomachinery components.
Journal ArticleDOI
Vibration of doubly curved shallow shells with arbitrary boundaries
Mohamad S. Qatu,Ebrahim Asadi +1 more
TL;DR: In this article, the first comprehensive study of shallow shell vibrations subjected to as many as 21 possible boundary conditions is presented, including spherical, cylindrical and hyperbolic paraboloidal shells.
References
More filters
Journal ArticleDOI
Curvature effects on shallow shell vibrations
Arthur W. Leissa,A.S. Kadi +1 more
TL;DR: Curvature effects on shallow shell free vibration frequencies, solving linear eigenvalue problem as discussed by the authors, solving linear Eigenvalue Problem (LEP) and solving linear value problem.
Journal ArticleDOI
Dynamic analysis of shallow shells with a doubly-curved triangular finite element
M.D. Olson,G.M. Lindberg +1 more
TL;DR: In this paper, an efficient dynamic analysis capability for arbitrary shallow shell structures is developed and illustrated with several applications with experimental verifications, based on a compatible, doubly-curved shallow shell element of arbitrary triangular shape which includes thickness variations.
Journal ArticleDOI
Vibrations of cambered helicoidal fan blades
TL;DR: In this article, a conforming finite shell element suitable for the analysis of curved twisted fan blades is developed and applied to a number of fan blade models, where the element is assumed to be a doubly curved right helicoidal shell, in which the curvature is shallow with respect to the twisted base plane defining the helicoid.
Journal Article
Turbine blading excitation and vibration
TL;DR: A review of the literature on blade excitation forces, vibration of turbine blades with large and small aspect ratios, disc blade interaction, and experimental methods of vibration measurement, including the use of a laser doppler instrument, is presented in this article.
Related Papers (5)
Vibrations of cantilevered shallow cylindrical shells of rectangular planform
Vibration characteristics of initially twisted rotating shell type composite blades
YoungJung Kee,Ji-Hwan Kim +1 more