Prediction of source characteristics of engine exhaust manifolds

Dokumaci E.

JOURNAL OF SOUND AND VIBRATION, vol.280, pp.925-943, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 280
  • Publication Date: 2005
  • Doi Number: 10.1016/j.jsv.2003.12.052
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.925-943
  • Dokuz Eylül University Affiliated: No


Engine exhaust noise source is often described in frequency domain by the impedance and strength of an equivalent acoustic one-port source at a reference plane downstream of the exhaust manifold. These parameters can be measured by experimental methods, however, it is also desirable to develop methods for their prediction. A pre-requisite for the prediction of the equivalent one-port acoustic source parameters of an engine manifold is a linear mathematical model of the breathing noise generation mechanism at the valves. The present paper proposes new mathematical models for this source mechanism and the prediction of the one-port source characteristics of engine exhaust noise. The analysis is based on basic fluid dynamic equations for inviscid one-dimensional flow and encompasses both linear time-invariant, linear time variant and non-linear one-port source models. A systematic procedure is presented for the calculation of one-port source characteristics of engine manifolds, with an application to a 4 cylinder engine exhaust manifold.