Noise Source Identification Using Phase Analysis Ford Motor Company

Format:

Conference/Event

Author/Creator:

Fernandes, Fernandes, author.

Contributor:

Ananias, Claudio H.

Ferreira, Hudson

Martínez, Ricardo

Meccia, Carlos

Prati, Sergio

Conference Name:

SAE Brasil International Noise and Vibration Congress (2010-10-17 : Santa Catarina, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Noise source identification has been a subject well studied inthe past few years. Automobile manufactures along with specializedsupplies have been developed some methods in this matter. Theimportance of such subject is quite obvious, especially in the autoindustry: identify potential problems and point out solutions forNVH.There are several methods of noise source identification widelyused. Among them, one can mention "Hotspot Search," whichconsists of noise intensity measurement, mapping and ranking therelative contribution of each substructure of one body. Anothermethod used, one can point out is the STSF (Spatial Transformationof Sound Fields). It consists of a measurement over a scan planeusing a set of microphone array. In this way, a 2D sound field canbe transformed in a 3D description and source direction can beidentified.However, when noise and vibration sources need to be identifiedtogether in a multi-body system, conventional techniques might notbe the best choice. In this scenario, a signal phase analysis wasdeveloped in order to cope with a low frequency noise identified ina vehicle. The noise occurrence was measured and identified interms of frequency. The measurement setup was described usingaccelerometers and microphones installed in the vehiclesuspension.The vibration path was determined using bode diagrams, as longwith the noise source. The delay among signal is easy to obtain andgives a clear picture of the vibration/noise phenomena. Thecondition in which the vibration was excited was also possible tobe identified through the comparison of bode diagrams during thenoise. The method helped to identify a resonance frequency of thebrake caliper coupled with brake pads, generating a self-excitednon-linear phenomenon.Phase analysis method has shown to be suitable not only fornoise but also for vibration. As it is simple to be applied andalso competitive cost wise in comparison with other methods, itrepresents a powerful tool in noise analysis

Notes:

Vendor supplied data

Publisher Number:

2010-36-0543

Access Restriction:

Restricted for use by site license