The authors study the influence of noise on an array of micro-scale oscillators with a focus on the phenomenon of intrinsic localized modes (ILMs). It is shown numerically that a white noise excitation, by itself, is unable to produce ILMs. However, under a combined deterministic and random excitation, a noise strength threshold is observed beyond which the ILM at one location in attenuated whilst the localization at another location is strengthened. The results motivate an analytical approach wherein the Fokker-Planck equation and approximate moment evolution equations are derived for a typical cell of the array. Numerical solutions of the moment equations suggest that once a localization event occurs in the array, an excitation with noise strength above a threshold value contributes to the persistence of the event. The reported results can form the basis for developing a fundamental understanding of the influence of noise on ILMs in coupled arrays of nonlinear oscillators including micro-scale oscillator arrays.
|Original language||English (US)|
|Title of host publication||IUTAM Symposium on Multi-Functional Material Structures and Systems - Proceedings of the IUTAM Symposium on Multi-Functional Material Structures and Systems|
|Number of pages||10|
|State||Published - 2010|
|Event||IUTAM Symposium on Multi-Functional Material Structures and Systems - Benguluru, India|
Duration: Dec 10 2008 → Dec 12 2008
|Other||IUTAM Symposium on Multi-Functional Material Structures and Systems|
|Period||12/10/08 → 12/12/08|
Bibliographical noteFunding Information:
Partial support received for this work through ARO Grant No. W911NF05100 76 and NSF Grant No. 0826173 are gratefully acknowledged.
- Intrinsic localized modes
- Micro-scale oscillators
- Nonlinear vibration
- White noise