A Mathematical Images Group Model to Estimate the Sound Level in a Close-Fitting Enclosure
Author
Source
Advances in Acoustics and Vibration
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-06-12
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
This paper describes a special mathematical images model to determine the sound level inside a close-fitting sound enclosure.
Such an enclosure is defined as the internal air volume defined by a machine vibration noise source at one wall and a parallel reflecting wall located very close to it and acts as the outside radiating wall of the enclosure.
Four smaller surfaces define a parallelepiped for the volume.
The main reverberation group is between the two large parallel planes.
Viewed as a discrete line-type source, the main group is extended as additional discrete line-type source image groups due to reflections from the four smaller surfaces.
The images group approach provides a convergent solution for the case where hard reflective surfaces are modeled with absorption coefficients equal to zero.
Numerical examples are used to calculate the sound pressure level incident on the outside wall and the effect of adding high absorption to the front wall.
This is compared to the result from the general large room diffuse reverberant field enclosure formula for several hard wall absorption coefficients and distances between machine and front wall.
The images group method is shown to have low sensitivity to hard wall absorption coefficient value and presents a method where zero sound absorption for hard surfaces can be used rather than an initial hard surface sound absorption estimate or measurement to predict the internal sound levels the effect of adding absorption.
American Psychological Association (APA)
Panza, Michael J.. 2014. A Mathematical Images Group Model to Estimate the Sound Level in a Close-Fitting Enclosure. Advances in Acoustics and Vibration،Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-460275
Modern Language Association (MLA)
Panza, Michael J.. A Mathematical Images Group Model to Estimate the Sound Level in a Close-Fitting Enclosure. Advances in Acoustics and Vibration No. 2014 (2014), pp.1-7.
https://search.emarefa.net/detail/BIM-460275
American Medical Association (AMA)
Panza, Michael J.. A Mathematical Images Group Model to Estimate the Sound Level in a Close-Fitting Enclosure. Advances in Acoustics and Vibration. 2014. Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-460275
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-460275