High-speed helicopter rotor impulsive noise prediction is an important problem of aeroacoustics. The deterministic quadrupoles have been shown to contribute significantly to high-speed impulsive (HSI) noise of rotors, particularly when the phenomenon of delocalization occurs. At high rotor-tip speed
Non-linear effect in high speed rotor noise
β Scribed by J.D. Morgan
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 882 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0022-460X
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π SIMILAR VOLUMES
A combined Computational Fluid Dynamics(CFD)-Kirchhoff method is presented for predicting high-speed impulsive noise generated by a rotor in hover. Two types of Kirchhoff integral formulas are used: one of them is a classical linear Kirchhoff formulation and the other a non-linear Kirchhoff formulat
In this paper, a nonlinear indirect adaptive sensorless speed and #ux tracking controller for induction motors is proposed. In the controller, only the stator currents are assumed to be measurable. Flux observers and rotor speed estimator are designed to relax the need to #ux and speed measurement.
The non-linear response of a rotor supported by active magnetic bearings is investigated, and both primary and internal resonances are considered. The method of multiple scales is used to obtain four "rst order ordinary di!erential equations that describe the modulation of the amplitudes and phases