Vehicle Powertrain Noise Diagnosis Using Acoustic Holography Techniques

972052

05/20/1997

Event
SAE Noise and Vibration Conference and Exposition
Authors Abstract
Content
New techniques like Nearfield Acoustic Holography (NAH) and Spatial Transformation of Sound Field (STSF) possess all the potential to become widely-accepted tools for powertrain noise analysis in near future. These techniques demonstrate versatility, rapidity and inexpensiveness, which are very important features for faster and cost-competitive NVH development of the powertrain. Yet, there are certain limitations, for example, high-frequency cut-off depending on how small the microphone-grid resolution is, etc.
This paper includes a concise discussion of problems and promises of NAH application for powertrain systems. Portrayals are given of the detailed application of acoustic holography techniques for complete powertrain system noise analysis. An insight into a few algorithms to circumvent the high-frequency cut-off limitations is provided. With the help of spectral plots, sound intensity order waterfalls and surface vector maps, attempts have been made to illustrate how this technique could be advantageously used to diagnose, identify, and characterize significant noise sources in a powertrain system.
Meta TagsDetails
DOI
https://doi.org/10.4271/972052
Pages
17
Citation
Patro, T., "Vehicle Powertrain Noise Diagnosis Using Acoustic Holography Techniques," SAE Technical Paper 972052, 1997, https://doi.org/10.4271/972052.
Additional Details
Publisher
Published
May 20, 1997
Product Code
972052
Content Type
Technical Paper
Language
English