New techniques like Near-field Acoustic Holography (NAH) and Spatial Transformation of Sound Field (STSF) possess all the potential to become widely-accepted tools for powertrain noise analysis in the near future. These techniques demonstrate versatility, rapidity and inexpensiveness, which are very important features for faster and cost-competitive NVH (Noise Vibration and Harshness) development of the powertrain. Yet, there are certain limitations, for example, high-frequency cut-off depending on how small the microphone-grid resultion 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.
Vehicle powertrain noise diagnosis using acoustic holography techniques
Diagnose der Schallemission von Fahrzeuggetrieben mit Hilfe der akustischen Holographie
1997
17 Seiten, 32 Bilder, 26 Quellen
Aufsatz (Konferenz)
Englisch
Vehicle Powertrain Noise Diagnosis Using Acoustic Holography Techniques
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