Accession Number : ADP009086

Title :   Transfer of Energy from High-Frequency to Low-Frequency Modes.

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Nayfeh, A. H. ; Nayfeh, S. A. ; Anderson, T. A. ; Balachandran, B.

Report Date : SEP 1993

Pagination or Media Count : 21

Abstract : In some recent experimental studies, we observed that energy can be transferred from high-frequency to low-frequency modes in structures with weak nonlinearities. In these experiments, a structure was subjected to a simple-harmonic, low-amplitude excitation. The frequency of the excitation was near one of the high natural frequencies; yet after a very long time the contribution of the first mode to the multi-frequency response was larger than the contribution of the high-frequency mode that was directly excited. Subsequently, we developed analytical models to explain the interactions between widely spaced modes of structures and used them to determine conditions under which energy can be transferred from high-frequency to low-frequency modes, as observed In the experiments.

Descriptors :   *ENERGY TRANSFER, *FREQUENCY SHIFT, AMPLITUDE, EXCITATION, FREQUENCY RESPONSE, HARMONICS, HIGH FREQUENCY, INTERACTIONS, LOW FREQUENCY, MODELS, RESONANT FREQUENCY.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE