Siemens Aktiengesellschaft

Eurocopter Deutschland Gmbh

Dieter Roth

Marius Bebesel

Reinhard Pongratz

A method for avoiding a collision of a rotating rotor blade of a rotary-wing aircraft with a blade vortex, and a device for executing the method. An aerodynamic parameter of the rotor blade of a rotary-wing aircraft is controlled, (for example, variation of the angle of incidence of the blade or profile variation of the blade), using a signal processing device that includes at least one open-loop and/or closed-loop control device, in such a way that a collision of the rotor blade with blade vortices becomes avoidable. The frequency content from the signal of the sound-pressure sensors is rapidly and precisely found. The harmonics are progressively adapted. A lesser calculation requirement per step and increase accuracy, as compared with an FFT analysis, is provided.

Method and device for avoiding a collision of a rotating rotor blade of a rotary-wing aircraft with blade vortex

A transmission/reception module suitable for use in electronically phase-controlled antennas for a synthetic aperture radar includes a circulator provided for each individual radiator element terminal to achieve vertical and horizontal polarization. A low-noise amplifier is connected to the circulator in the reception path. A high-power amplifier is connected to the circulator in the transmission path. The two separate polarization reception channels each include a low-noise amplifier. The two separate polarization transmission channels each include a high-power amplifier. The reception channels and transmission channels are respectively connected to a polarization change-over. Switching arms of the polarization change-over are then connected to either the reception contact or the transmission contact of the transmission/reception switch.

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Munich, Germany

Dieter Roth