Patent ID: 9709124
Date: 2017-07-18
CPC Classifications: F16F

Claim:
1. A helicopter rotor drag damper comprising: a first hollow cylindrical frame, symmetrical relative to a longitudinal axis, and closed at one end; a second frame symmetrical relative to the longitudinal axis and arranged partially inside the first frame; a vibration absorbing element mechanically coupling the first and second frames together, wherein the helicopter rotor drag damper further comprises: an arm parallel to the longitudinal axis, fixed cantilever-fashion to just one of the first or second frames, and provided with a magnetic dipole of north-south direction parallel to the longitudinal axis; at least one 3D Hall-effect magnetic sensor secured to the frame which does not bear the arm provided with the magnetic dipole, the 3D Hall-effect magnetic sensor being arranged facing the dipole parallel to the longitudinal axis and separated from the dipole by a determined air gap, the sensor being capable of generating data on the relative displacement of the two frames parallel to the longitudinal axis; at least one temperature sensor arranged in thermal contact with the vibration absorbing element so as to generate temperature data; at least one force sensor arranged so as to generate data on pressures or loads to which the vibration damper is subjected; a transmitter of the displacement, temperature and load data generated by the 3D Hall-effect magnetic sensor, the temperature sensor and the force sensor; an electrical power supply linked electrically to the sensors and to the transmitter.