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| Wavelet analysis of helicopter noise signal | |
| 摘 要： | 1 IlltroductionAt the preseni tAne, for civil helicopters, stronger lindation is Anposed by certilicationrules to reduce acoustic nulsance. And for nillltary helicopters, noise reduction has aIso beenconcerned in liIIiltation of detectability. Therefore hellcopter noise generation and conirol hasbecome an increasingly important problem for the helicopter design. Por turbine-driven hell-copter widely used at presellt, the noise generation mechaIilsm can be divided into aerodynandcnoise and m… |
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