초록 ▼

A method and apparatus for detecting oscillatory phenomena indicative of airflow separation or sensor common mode oscillatory failure is disclosed. The oscillations of a differential pressure transducer that senses the pressure difference on the opposite sides of an airfoil are bandpass filtered to

A method and apparatus for detecting oscillatory phenomena indicative of airflow separation or sensor common mode oscillatory failure is disclosed. The oscillations of a differential pressure transducer that senses the pressure difference on the opposite sides of an airfoil are bandpass filtered to remove oscillations lying outside of a band of interest. Oscillation peaks lying within the passband that exceed a positive or negative threshold produce pulses that are counted. The counter value is decremented each time an alternating peak is not detected within one-half cycle of a minimum frequency. If the allowable count threshold is exceeded, a latch is set. Setting the latch produces a command that can be used to inhibit the operation of systems that rely on data produced by the differential pressure transducer. An alternative path senses the position of a control element (e.g., rudder pedal position) and sets the latch if the control element position reaches an extreme value likely to produce an oscillation condition at the pressure differential transducer. The latch is reset if the oscillation condition subsides for a predetermined period of time. This provides protection against transient conditions without inhibiting control system operation for the balance of a flight.

대표청구항 ▼

A method of detecting oscillatory phenomena indicative of airfoil airflow separation or sensor common mode oscillatory failure and producing a trip command comprising: detecting the differential pressure on opposite sides of an airfoil and producing related differential pressure data; scaling said d

A method of detecting oscillatory phenomena indicative of airfoil airflow separation or sensor common mode oscillatory failure and producing a trip command comprising: detecting the differential pressure on opposite sides of an airfoil and producing related differential pressure data; scaling said differential pressure data for current flight conditions to produce scaled differential pressure data; bandpass filtering said scaled differential pressure data to eliminate perturbations outside of a frequency range of interest to produce bandpass filtered, scaled differential pressure data; analyzing said bandpass filtered, scaled differential pressure data to locate excursions of said bandpass filtered, scaled differential pressure data that exceed a predetermined threshold in both positive and negative directions and producing a pulse each time a threshold exceedance in one direction occurs after a threshold exceedance occurs in the opposite direction; and counting said pulses and producing a trip command if said pulse count exceeds a predetermined threshold.