Research Article
CAA of an Air-Cooling System for Electronic Devices
Table 1
Explanation of peaks in the acoustic spectra.
| Frequency in Hz | Trigger | Annotation |
| 215 | Acoustic cavity eigenmode | Front panel slot; Figure 24(a) | 278, 403 | Acoustic cavity eigenmodes | Card slots; Figures 24(b) and 24(c) | 416 | Acoustic cavity eigenmode | Mainboard slot; Figure 24(d) | 417, 833 | Blade passing frequency | Including higher harmonics; Figure 25 | 333, 667, 1000, 1333 | Rotor-stator interaction | Including higher harmonics; Figure 27 | 1666 | Blade-stator interaction | — | 2330 | First structural eigenmode | At 2320 Hz; Figure 9(a) | 2490 | Second structural eigenmode | At 2484 Hz; Figure 9(b) |
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