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Active Sound Transmission Control for Windows Using Cabon Nanotube Based Transparent Thin Film Speakers

[+] Author Affiliations
X. Yu, R. Rajamani, K. A. Stelson, T. Cui

University of Minnesota

Paper No. IMECE2005-81108, pp. 1857-1863; 7 pages
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-4216-9 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME


This paper explores the development of active sound transmission control systems for windows using transparent thin film speakers. A unique transparent thin film speaker consisting of a piezoelectric PVDF thin film coated with compliant carbon nanotube (CNT) based transparent conductors is developed. Acid treatment for single-walled carbon nantotubes (SWNTs) and layer-by-layer (LBL) nanoassembly based surface modification of the substrates are used to obtain highly transparent and conductive CNT thin films on both sides of a PVDF film. The developed thin film speaker shows good acoustic response over a broadband frequency range, and has the advantages of being flexible, transparent, and lightweight. Experimental results are presented showing that over 10 dB reduction in sound transmission is achieved globally. The transparent thin film actuators can thus be effectively used as actuators for active sound transmission control systems for windows.

Copyright © 2005 by ASME



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