PREDICTION OF EXHAUST NOISE FOR AUTOMOBILE IN CONSIDERATION OF TEMPERATURE AND AIRFLOW IN EXHAUST PIPE

It is very difficult to predict exhaust noise from an automobile under operating conditions on account of difficult modeling of the noise source and the total exhaust system. In this research, a virtual noise source is assumed at the gateway of the exhaust pipe, which is estimated by using interior absolute pressure and temperature of the experimental data and transfer characteristics by using acoustic Finite Element Method. On the other hand, acoustic building block approach is applied for combining difficult part in numerical modeling such as muffler including damping material and easy part such as pipe structure to build up the total exhaust system. When the virtual noise source and the total exhaust system are identified, it is useful to predict the exhaust noise in consideration of temperature and airflow by numerical simulation. The proposed method is confirmed by simple exhaust pipe and practical exhaust system under firing engine. For the covering abstract see IRRD E104312.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0962207233
• Corporate Authors:

  Institute of Noise Control Engineering

  Iowa State University, 210 Marston Hall
  Ames, IA  United States  50011-2153
• Authors:
  • TOI, T
  • HIROSE, F
  • Okubo, N
• Conference:
  • PROCEEDINGS OF INTERNOISE 99 - THE 1999 INTERNATIONAL CONGRESS ON NOISE CONTROL ENGINEERING
  • Location: FORT LAUDERDALE FLORIDA, United States
  • Date: 1999-12-6 to 1999-12-8
• Publication Date: 1999

Language

• English

Media Info

• Features: References;
• Pagination: p. 1803-6
• Serial:
  • Volume: 3

Subject/Index Terms

• TRT Terms: Automobiles; Exhaust pipes; Forecasting; Mathematical models; Measurement; Noise
• ITRD Terms: 1243: Car; 1384: Exhaust pipe; 132: Forecast; 6473: Mathematical model; 6136: Measurement; 2492: Noise
• Subject Areas: Environment;

Filing Info

• Accession Number: 00790217
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-9622072-3-3
• Files: ITRD
• Created Date: Apr 11 2000 12:00AM