Experiment and Theory on the Nonlinear Vibration of a Shallow Arch under Harmonic Excitation at the End
Resource
ASME Journal of Applied Mechanics.
ASME Journal of Applied Mechanics 74: 1061-1070
Journal
ASME Journal of Applied Mechanics
Journal Volume
74
Journal Issue
6
Pages
1061-1070
Date Issued
2007
Date
2007
Author(s)
Yang, Cheng-Han
Abstract
In this paper we study, both theoretically and experimentally, the nonlinear vibration of a shallow arch with one end attached to an electro-mechanical shaker. In the experiment we generate harmonic magnetic force on the central core of the shaker by controlling the electric current flowing into the shaker. The end motion of the arch is in general not harmonic, especially when the amplitude of lateral vibration is large. In the case when the excitation frequency is close to the nth natural frequency of the arch, we found that geometrical imperfection is the key for the nth mode to be excited. Analytical formula relating the amplitude of the steady state response and the geometrical imperfection can be derived via a multiple scale analysis. In the case when the excitation frequency is close to two times of the nth natural frequency two stable steady state responses can exist simultaneously. As a consequence jump phenomenon is observed when the excitation frequency, sweeps upward. The effect of geometrical imperfection on the steady state response is minimal in this case. The multiple scale analysis not only predicts the amplitudes and phases of both the stable and unstable solutions, but also predicts analytically the frequency at which jump phenomenon occurs. Copyright © 2007 by ASME.
Other Subjects
Electric currents; Electromechanical devices; Nonlinear analysis; Vibrations (mechanical); Electromechanical shakers; Excitation frequency; Nonlinear vibration; Arches
Type
journal article
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