Sound Intensity and Acoustic Source Quantification to Identify the Noise Contributions of Gasoline Direct Injection Components

Abstract

In this paper,the sound intensity and airborne source quantification methods were used to estimate the airborne noise radiating from ag asoline direction injection engine and the relative contributions of each of the engine's components to such airborne noise. In order to estimate noise contribution using airborne source quantification, the sound volume velocity for the source should be estimated. In previous methods, the sound volume velocity wasestimated using the inverse method, whereas in this paper,the sound volume velocity is estimated directly. Forthis work, the sources of noise radiating from thegasoline direction injection engine were first identified by measuring the sound intensity of the noise sources while the engine wasrunning idle. The sound volume velocities of these sources were estimated from the product of the area of that noise source and the directly measured particle velocity.Inorder to validate this method, twospeakers with different frequencies were installed in an anechoic chamber and the contribution of each source wase stimated. Finally,t his proposed method wasa pplied to the identification and contribution of noise sources in agasoline direction injection engine.

Modelling tyre noise in finite element simulations for pass-by noise predictions

“…This scheme is used – implicitly or explicitly – in different experimental methods aimed at source identification and applied both to internal combustion engines and to tyres. 8–11…”