期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 119, 期 4, 页码 2141-2149出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.2179747
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Through two complementary approaches, using modal response and wave propagation, the analyses presented here show the conditions under which a decaying impulse response, or a nearly irreversible energy trapping, takes place in a linear conservative continuous system. The results show that the basic foundation of near-irreversibility or apparent damping rests upon the presence of singularity points in the modal density of dynamic systems or, analogously, in the wave-stopping properties associated with these singularities. To illustrate the concept of apparent damping in detail, a simple undamped beam is modified to introduce a singularity point in its modal density distribution. Simulations show that a suitable application of a compressive axial force to an undamped beam placed on an elastic foundation attenuates its impulse response with time and develops the characteristics of a nearly irreversible energy trap. (c) 2006 Acoustical Society of America.
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