Research Article
An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear
Table 2
Modes of the cavity noise.
| | | Mode I | Mode I | Mode III | Mode IV |
| | Case 4 | Pre | 150.8 Hz | 301.6 Hz | 452.4 Hz | 603.2 Hz | | Exp | 141.6 Hz | 318.7 Hz | 450.0 Hz | 583.5 Hz |
| | Case 3 | Pre | 127.9 Hz | 255.7 Hz | 383.6 Hz | 511.5 Hz | | Exp | 119.4 Hz | 250.0 Hz | 374.3 Hz | 521.3 Hz |
| | Case 2 | Pre | 104.1 Hz | 208.2 Hz | 312.3 Hz | 416.4 Hz | | Exp | 107.3 Hz | 217.5 Hz | 319.2 Hz | 415.4 Hz |
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