Practical aspects of making NAH measurements

Authors

S. M. Dumbacher, University of Cincinnati
D. L. Brown, University of Cincinnati
J. R. Blough, Michigan Technological UniversityFollow
R. W. Bono, Modal Shop, Inc

Document Type

Conference Proceeding

Publication Date

5-17-1999

Department

Department of Mechanical Engineering-Engineering Mechanics

Abstract

Practical issues to consider when making measurements for Nearfield Acoustical Holography (NAH) analysis are addressed. These include microphone spacing and placement from the test surface, number of microphones and array size, reference microphone number and placement, and filtering of the data. NAH has become an accepted analysis tool so that several commercial packages are available. Its application is limited to test surfaces that are fairly planar, lending itself well to tire testing, front of dash testing, engine face testing, etc. In order to achieve accurate NAH results, the measurement and analysis process must be clearly understood on a practical level. Understanding the advantages and limitations of NAH and the measurement parameters required of it will allow the user to determine if NAH is applicable to a particular test object and environment.

Publisher's Statement

Copyright © 1999 Society of Automotive Engineers, Inc. Publisher’s version of record: https://doi.org/10.4271/1999-01-1847

Publication Title

SAE Technical Papers

Recommended Citation

Dumbacher, S., Brown, D., Blough, J. R., & Bono, R. (1999). Practical aspects of making NAH measurements. SAE Technical Papers. http://doi.org/10.4271/1999-01-1847
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/14261