| Autor: |
Lauchle, G. C., Brungart, T. A., Tichy, J. |
| Zdroj: |
Journal of the Acoustical Society of America; 1991, Vol. 89 Issue 4B, p1970-1971, 2p |
| Abstrakt: |
The heating ventilation, and air conditioning (HVAC) system of an automobile can be a source of acoustic annoyance, particularly when it is operated under maximum airflow conditions. In order to suggest possible design changes for the purpose of noise control, a systematic characterization of the acoustic sources and mechanisms must be conducted initially. This presentation addresses such a characterization for a typical system. The approach is based on acoustic intensity measurements of the stand-alone HVAC system operating under maximum airflow conditions in a flow-through anechoic chamber. The experimental data indicate that the centrifugal blower is the dominant low-frequency source of noise, while separation zones and the flow over sharp edges within the HVAC system ducting are secondary sources of noise that become increasingly dominant as the frequency increases into the kHz range. Qualification of these identified sources of sound is aided by detailed flow visualizations of the subject system. [Work supported by Ford Motor Co.] [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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