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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Loudness Scattering due to Vibro-Acoustic Model Variability

de Oliveira, Leopoldo P. R. [1] ; da Silva, Maira M. [1] ; Sanchez, Jaime A. Mosquera [1] ; Goncalves, Luiz A. M. [1]
Total Authors: 4
[1] Univ Sao Paulo, Sch Engn, Dept Mech Engn, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of the Brazilian Society of Mechanical Sciences and Engineering; v. 34, n. 2, p. 604-611, 2012.
Web of Science Citations: 5

The use of numerical simulation in the design and evaluation of products performance is ever increasing. To a greater extent, such estimates are needed in an early design stage, when physical prototypes are not available. When dealing with vibro-acoustic models, known to be computationally expensive, a question remains, which is related to the accuracy of such models in view of the well-known variability inherent to the mass manufacturing production techniques. In addition, both the academia and industry have recently realized the importance of actually listening to a products sound, either by measurements or by virtual sound synthesis, in order to assess its performance. In this work, the scatter of significant parameter variations on a simplified vehicle vibro-acoustic model is calculated on loudness metrics using Monte Carlo analysis. The mapping from the system parameters to sound quality metric is performed by a fully-coupled vibro-acoustic finite element model. Different loudness metrics are used, including overall sound pressure level expressed in dB and Specific Loudness in Sones. Sound quality equivalent sources are used to excite this model and the sound pressure level at the driver's head position is acquired to be evaluated according to sound quality metrics. No significant variation has been perceived when evaluating the system using regular sound pressure level expressed in dB and dB(A). This happens because of the third-octave filters that average the results under some frequency bands. On the other hand, Zwicker Loudness presents important variations, arguably, due to the masking effects. (AU)

FAPESP's process: 10/03556-1 - Active Structural Acoustic Control: Design, Simulation and Sound Quality Analysis
Grantee:Jaime Alberto Mosquera Sánchez
Support type: Scholarships in Brazil - Master
FAPESP's process: 10/02198-4 - Active sound quality control
Grantee:Leopoldo Pisanelli Rodrigues de Oliveira
Support type: Research Grants - Young Investigators Grants