Three-Dimensional Vibration Analysis of a Truncated Quadrangular Pyramid

[+] Author and Article Information
T. Irie

Kansai University, Suita, 564 Japan

G. Yamada, Y. Tagawa

Hokkaido University, Sapporo, 060 Japan

J. Appl. Mech 54(1), 115-120 (Mar 01, 1987) (6 pages) doi:10.1115/1.3172944 History: Received November 05, 1985; Revised September 18, 1986; Online July 21, 2009


An analysis is presented for the three-dimensional vibration problem of determining the natural frequencies and the mode shapes of a truncated quadrangular pyramid. For this purpose, the body is transformed into a right quadrangular prism with unit edge lengths by a transformation of variables. With the displacements of the transformed prism assumed in the forms of algebraic polynomials, the dynamical energies of the prism are evaluated, and the frequency equation is derived by the Ritz method. This method is applied to quadrangular pyramids in which the base is clamped and the other sides are free, and the natural frequencies (the eigenvalues of vibration) and the mode shapes are calculated numerically, from which the vibration characteristics arising in the pyramids are studied.

Copyright © 1987 by ASME
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