Precise velocity measurements for driven intrinsic localized modes in the acoustic spectrum of small cantilever arrays

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概要

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• The speed of a traveling intrinsic localized mode (ILM) in the acoustic spectrum of a micromechanical cantilever array is experimentally measured at high resolution as a function of the driving frequency. A repeating speed pattern is observed for chaotic and regular traveling ILMs between adjacent extended wave normal mode frequencies. The speed of a regular traveling ILM is almost the same as the plane wave dispersion group velocity at that frequency. Since ILM amplification only occurs during reflections at the ends of the array the phase matching condition for long time stability is greatly relaxed. A double humped distribution of speeds, found for chaotic ILMs, is shifted from the regular ILM nearly monochromatic speed value due to the modulational instability. Numerical simulations reproduce many of the experimental observations, demonstrating that intrinsic dynamical properties of the small array are being measured.

著者

• Soga Yukihiro

  Graduate School Of Human And Environmental Studies Kyoto University

• Shi Weihua

  Graduate School Of Natural Science And Technology Kanazawa Univ.

• Nishimura Soichi

  Graduate School Of Natural Science And Technology Kanazawa Univ.

• Sato Masayuki

  Graduate School of Economics, Kyoto University

• Fujita Naoki

  Graduate School of Natural Science and Technology, Kanazawa University

• Soga Yukihiro

  Graduate School of Natural Science and Technology, Kanazawa University

• Takao Yuichi

  Graduate School of Natural Science and Technology, Kanazawa University

• Sada Yurina

  Graduate School of Natural Science and Technology, Kanazawa University

• Sievers Albert

  Laboratory of Atomic and Solid State Physics, Cornell University

• Sievers Albert

  Laboratory of Atomic and Solid State Physics Cornell University

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