Skip to main content

The Influence of Eigentones in Intake and Exhaust Manifolds on Intake and Exhaust Noise Radiation

Buy Article:

$25.00 plus tax (Refund Policy)

Natural oscillation modes in intake and exhaust manifolds of multi-cylinder internal combustion engines (mainly car four-cylinder engines) are considered. The engine with manifolds is considered as the source of the sound waves in the intake and the exhaust systems. The basic rules governing the spectrum formation of the manifold eigenmodes are investigated.

It is shown that some of the natural modes do not depend very much on the intake and exhaust systems after the manifolds. The sound increase (particularly for an asymmetrical excitation) caused by these modes depends on the degree of the asymmetry of the manifold and on the energy dissipation in the manifold. Under some conditions this increase creates a resonance sound radiation.

The tendency for resonance excitation at the branch of intake (exhaust) pipes with mufflers, with unfavourable and arbitrary combinations of their characteristics, is considered as one of the criteria for the quality of manifold construction. Special attention is paid to the intake manifold of modern four cylinder engines equipped with airbox. It is shown that a good design of the manifold of these engines allows decreasing their intake noise by 4–6 dB(A) in a wide range of crankshaft RPM.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 01 November 1997

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Information for Advertisers
  • Online User License
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more