Material and system modification for sound pressure enhancement of the carbon nanotubes thermoacoustic devices = 탄소 나노튜브 열음향 스피커의 음압 향상을 위한 물질적, 시스템적 개선

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The thermoacoustic loudspeaker, which has no vibrating membrane with omnidirectional sound generation, would be a candidate for the next generation loudspeaker. However, there is a physical limit of sound pressure caused by the nature of driving mechanism. Therefore, it shows performance below the sound pressure of the conventional dynamic loudspeaker. In this paper, we propose the material and system improvement to overcome low sound pressure performance of the thermoacoustic loudspeaker. One of the advantages of thermoacoustic sound is that the sound pressure is proportional to the input power. Therefore, it is possible to achieve sound pressure performance similar to that of a dynamic loudspeaker in a high power situation. In the first chapter, we propose an insulator coated transducer to withstand high power. Insulator coating improves maximum input power by more than 40% without degrading sound pressure performance. In the second chapter, we apply the thermoacoustic resonators to reinforce the low sound pressure of the thermoacoustic loudspeaker in the low-frequency range. The design of a multiway loudspeaker with three thermoacoustic resonators is discussed to reinforce the sound pressure in wide band low-frequency region. The fabricated multiway loudspeaker has an improved sound pressure level of more than 10 dB at 500 Hz compared to conventional thermoacoustic loudspeakers.
Advisors
Cho, Byung Jinresearcher조병진researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학부, 2018.2,[iv, 38 p. :]

Keywords

Thermoacoustic▼aSound pressure▼aInsulator coating▼aResonator▼aMultiway loudspeaker; 열음향▼a음압▼a절연체 코팅▼a공진기▼a멀티웨이 스피커

URI
http://hdl.handle.net/10203/266932
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734025&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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