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Normal Modes and Localization in Nonlinear Systems (Hardcover, 2001 ed.)
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Normal Modes and Localization in Nonlinear Systems (Hardcover, 2001 ed.)
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The nonlinear normal modes of a parametrically excited cantilever
beam are constructed by directly applying the method of multiple
scales to the governing integral-partial differential equation and
associated boundary conditions. The effect of the inertia and
curvature nonlin earities and the parametric excitation on the
spatial distribution of the deflection is examined. The results are
compared with those obtained by using a single-mode discretization.
In the absence of linear viscous and quadratic damping, it is shown
that there are nonlinear normal modes, as defined by Rosenberg,
even in the presence of a principal parametric excitation.
Furthermore, the nonlinear mode shape obtained with the direct
approach is compared with that obtained with the discretization
approach for some values of the excitation frequency. In the
single-mode discretization, the spatial distribution of the
deflection is assumed a priori to be given by the linear mode shape
centsn, which is parametrically excited, as Equation (41). Thus,
the mode shape is not influenced by the nonlinear curvature and
nonlinear damping. On the other hand, in the direct approach, the
mode shape is not assumed a priori; the nonlinear effects modify
the linear mode shape centsn. Therefore, in the case of
large-amplitude oscillations, the single-mode discretization may
yield inaccurate mode shapes. References 1. Vakakis, A. F.,
Manevitch, L. I., Mikhlin, Y. v., Pilipchuk, V. N., and Zevin A.
A., Nonnal Modes and Localization in Nonlinear Systems, Wiley, New
York, 1
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