Sound Power Estimation of a Mounted Car Engine Microflown Technologies

Format:

Conference/Event

Author/Creator:

Grosso, Grosso, author.

Contributor:

De Bree, Hans-Elias

Wind, Jelmer

Conference Name:

6th International Styrian Noise, Vibration & Harshness Congress - Sustainable NVH solutions inspired by ecology and economy (2010-06-09 : Graz, Austria)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The NVH optimization process of a power train often consists in a target setting for the acoustic power radiation of the engine in free field working conditions (in an anechoic or semi-anechoic room). This method requires the engine to be dismounted from the car and to be measured in an anechoic or semi-anechoic room which is costly and time consuming. Moreover the free-field characterization is not a good predictor of the acoustic behavior of the power train when it is mounted in the engine bay of a car (very reactive field).This paper presents a number of existing methods to determine the acoustic power radiation pattern of the engine mounted in a car using an intensity probe which is based on a pressure sensor and a particle velocity sensor. For the lower frequencies the velocity probe is used, for the higher frequencies both pressure and velocity is used to measure intensity.A new method for the mid-low frequency range is presented. A measurement in a non-anechoic engine test room is done to determine the relation between the particle velocity close to the surface of the engine to the intensity at a certain distance. This relation is used to estimate the intensity at lower frequencies from the surface velocity

Notes:

Vendor supplied data

Publisher Number:

2010-01-1415

Access Restriction:

Restricted for use by site license