Title page for etd-0526115-161822


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URN etd-0526115-161822
Author Po-chia Su
Author's Email Address subochia@gmail.com
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Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Using Perforated plate Structures to Realize the Wave Invisible Effect of Acoustic Cloak
Date of Defense 2014-09-12
Page Count 77
Keyword
  • Perforated Plastic Plate
  • Acoustic Shadowing
  • Acoustic Cloak
  • Abstract The acoustic cloak controls sound waves and it has ability to curve and twist sound waves as well. When sound waves pass through the acoustic cloak, it will be curved and surround in acoustic cloak, moreover, the sound waves avoid contents on the inside. Let the sound waves misunderstand there is no object exist.
    This study elaborates on acoustic cloak model which is designed by perforated plastic plates. Utilizing the different perforation diameters of plastic plate structural units to change the effective acoustic impedance value and the anisotropic medium is constructed to establish the acoustic cloak model.
    The study concerns on two experiments. The purpose of the first experiment validates that whether the acoustic cloak has covering effect toward the acoustic field. The experimental results and the theoretical solutions not only describe the same tendency but suggests the feasibility of the acoustic cloak. On the other hand, the second experiment explores energy dissipation of acoustic cloak. It is concluded that most of the energy of positions have merely change when install the acoustic cloak. Therefore, this experiment confirms that if the acoustic cloak device can be use as military equipment to achieve stealth at the specific frequency. The acoustic cloak model was experimented in semi-anechoic chamber. Based on the actual acoustic field measurement not only to validate the observation of acoustic shadowing but to evaluate the acoustic cloak shadowing effect and the feasibility of design concept, so that there are practical applications on acoustic shadowing research, development and production in the future.
    Advisory Committee
  • Bor-Tsuen Wang - chair
  • Shao-Yi Hsia - co-chair
  • Jyin-Wen Cheng - co-chair
  • Yi-Cheng Huang - co-chair
  • Shiuh-Kuang Yang - advisor
  • Files
  • etd-0526115-161822.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-07-02

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