ACOUSTIC DOUBLE BAFFLE UTILIZING PROGRAMMED EXPANDABLE FOAM AS BODY CAVITY SEAL

Single baffles based on heat activated foams have found increasing use as body cavity filler to inhibit noise propagation through hollow body channels of passenger cars. While the benefit of double decoupled layers in noise reduction is well known, no double baffle design was economically feasible previously, due to the limitations of conventional heat activated foams. A double baffle design based on preprogrammed heat activated foam technology is introduced. The preprogramming imparts directional control that enables more effective filling and makes double baffle design possible. The differences between preprogrammed and conventional foams are reviewed, the advantages of preprogrammed foams are presented, and the benefits of the double baffle over the single baffle design are demonstrated by acoustic testing. (A) For the covering abstract see IRRD E100043.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/1860581455
• Corporate Authors:

  PROFESSIONAL ENGINEERING PUBLICATIONS LTD

  NORTHGATE AVENUE
  BURY ST EDMUNDS, SUFFOLK  United Kingdom  IP32 6BW
• Authors:
  • CHANG, R J
  • DAWES, K
  • SCHWARTZ, L
  • FICK, R
• Conference:
  • EUROPEAN CONFERENCE ON VEHICLE NOISE AND VIBRATION, HELD 12-13TH MAY 1998, IMECHE HEADQUARTERS, LONDON, UK. IMECHE CONFERENCE TRANSACTIONS 1998-5
• Publication Date: 1998

Language

• English

Media Info

• Features: References;
• Pagination: p. 141-8

Subject/Index Terms

• TRT Terms: Absorption; Conferences; Expanded materials; Joint sealing; Motor vehicle bodies; Noise
• Uncontrolled Terms: Cavities
• ITRD Terms: 6758: Absorption; 1356: Body (car); 5738: Cavity; 8525: Conference; 4502: Expanded material; 3608: Joint sealing; 2492: Noise
• Subject Areas: Data and Information Technology; Environment;

Filing Info

• Accession Number: 00759316
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 1-86058-145-5
• Files: ITRD
• Created Date: Feb 19 1999 12:00AM