Airbus Operations (s.a.s.)

Eads Deutschland Gmbh

Airbus Operations Gmbh

Wilhelm Ficker

Marius Bebesel

Josef Schalk

Gerhard Mueller

Gerhard Müller

Francois Cros

Stefan Sassen

Thomas Ziemann

Konrad Lentner

Gerhard Muller

Wolfgang Legner

Delphine Hertens

Reinhard Reischl

Angelika Krenkow

A device for monitoring particle contamination in flowing hydraulic fluids includes a mechanism for particle counting and particle sizing. Further, a method for monitoring particle contamination in flowing hydraulic fluids: determines fluid flow velocity; counts particles in the hydraulic fluid passing the light barrier for a fixed period of time; and obtains particle size distribution by using a range of different trigger levels. The monitoring device is insertable into an A/C hydraulic system to enable an online-monitoring of degradation of fluid quality during normal flight operations or on the ground. The device and method help lower costs for A/C maintenance and increase A/C availability since necessary service actions can be scheduled strategically.

Device and method for monitoring the particle contamination in flowing hydraulic fluids

A device for determining the frequency and/or the amplitude of a vibrating structure includes a vibrating element ( ) and a pair of position sensors ( ) for the determination of the deflection of the vibrating element ( ). The position sensors ( ) are arranged such that their measurements during a half-wave of vibration exceed and/or are less than one another. A comparator compares the measurements of the two position sensors ( ) to determine a threshold value U for the half-wave of the vibration at which their measurements are equal. A device is used for determining the duration during which the measurement of one of the two position sensors ( ) exceeds or is less than the threshold value U . The position sensors ( ) can be capacitors whose electrodes are arranged in a step-like manner. The determination of the amplitude of the vibration is, carried out independent of a potential parallel shift of the movable element ( ), such that there is no distortion of the measurement result.

Device and method for determining frequency and amplitude of an oscillating structure, especially for measuring acceleration or rotational rates

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Pöring, Germany

Wilhelm Ficker