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METHOD FOR PROVIDING A SIGNAL FOR CONTROLLING LEAF SWEEPING NOISE FROM A ROTATING FLOATER
METHOD FOR PROVIDING A SIGNAL FOR CONTROLLING LEAF SWEEPING NOISE FROM A ROTATING FLOATER
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机译:提供一种信号来控制旋转飘叶上的扫频噪声的方法
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摘要
A technique for providing a signal representative of blade vortex interaction (BVI) noise for a multi-blade rotorcraft. The fluid (air) pressure at one, two, or more predetermined locations on a rotor blade is measured during at least one predetermined azimuthal segment of blade rotation during operation to provide respective pressure measurements. The pressure measurements are processed to provide a signal for use as a control variable in a control system for the active control of BVI noise. The pressure measurements are made within 10% blade chord length of the blade leading edge and preferably two or more are made between 65% and 95% of blade radial-length. The pressure measurements are filtered and the band of retained frequencies is between 20 and 48 times the rotor rotation frequency. An algorithm operative over a determined blade frequency range optimizes the signal for control use.
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