An aircraft low tire pressure sensing and cockpit display and warning system utilizing axle wheel pair comparator circuitry to provide signals representative of pressures of the axle wheel pair less than a predetermined value, e.g. 15 percent less than a preset value determined by tire requirements or a difference between axle wheel pair pressures greater than a given value, e.g. 25 psi. In the event of tire master warning lamp illumination on the flight deck warning display, further push button interrogation and identification of the axle pair causing the warning can be made by a crew member on the flight deck warning display.
A device for measuring the pressure of tires, particularly for aircraft, comprising a passive sensor adapted linearly to convert a variation in pressure into an electrical information variation, in situ, means adapted to convey the electrical information from the sensor to the cockpit of said aircraft, a self-oscillator whose oscillation frequency is controlled by the value of said electrical information from the sensor and means adapted to convert the signal issuing from said self-oscillator into a D.C. voltage proportional to a frequency variation, said frequency variation being proportional to said variation in pressure, characterized in that the electrical information from the sensor, before transmission into the cockpit, is applied to the terminals of the primary winding of a high frequency transformer, said primary winding being mechanically fast with the wheel, the secondary winding of said transformer being concentric with respect to the primary winding and mechanically fast with the stationary part of the landing gear, the ratio n of transformation between the primary winding and the secondary winding modifying the electrical information from the sensor according to the square of said ratio n.
A device for monitoring the anchor or anchor chain, intended for facilities floating ahead of the anchor, such as ships, comprising a measurement device which determines by one or more sensors the prevailing state at one or more points of an anchor chain or anchor, between the anchor chain and a ship, or between the anchor and the ship, then generates an electrical signal representative of the strength to a transmitter which, upon reception of the signal transmitted by the measurement device, sends a corresponding signal. An alarm system receives the signal sent by the transmitter and triggers an alarm if the measured state exceeds a set value.
The device for measuring a parameter pertaining to a rotary element rotating about a shaft carried by a fixed structure, comprises, on the rotary element, at least one sensor (15) with an associated electric circuit and, on the structure, an electric energy generator (3), coupling means (6, 11) for transmitting electric energy from the generator (3) to the sensor (15) and, in return, the signals from the sensor (15) to utilization means (8, 9). The generator (3) produces electric power at a frequency lower than 100 kHz and the circuit associated with the sensor (13, 14, 16, 17, 18, 19, 20) generates a signal of high frequency which varies within a wide band between 20 and 100 kHz, the coupling being achieved by a transformer (6, 11) in the form of a rotating machine whose structure allows the passage of a wide pass band at least between the frequency of the generator and 100 kHz. This device is in particular applicable to the measurement of the pressure of pneumatic tires of aircraft undercarriages.
4758969 - Abstract - Owned by Precision Mecanique Labinal (Montigny-Le-Bretonneux,FR)
The device comprises a central BTMS computer and a central TPIS computer, for each set of wheels, a bus (a,b,c,d,e) leading to the temperature sensors (21,22,23 and 24), and, through a coupling (8,9,10,11), to the pressure sensors (16,17,18,19) with means for frequency coding the pressure and temperature, a TPIS supply source (2) and multiplexing means sending, through the buses, the temperature data to the BTMS computer and the pressure data to the TPIS computer.
A device for monitoring the anchor or anchor chain, intended for facilities floating ahead of the anchor, such as ships, comprising a measurement device which determines by one or more sensors the prevailing state at one or more points of an anchor chain or anchor, between the anchor chain and a ship, or between the anchor and the ship, then generates an electrical signal representative of the strength to a transmitter which, upon reception of the signal transmitted by the measurement device, sends a corresponding signal. An alarm system receives the signal sent by the transmitter and triggers an alarm if the measured state exceeds a set value.
