Patent ID: 11905033
Assignee: GOODRICH CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A hard-landing detection system of an aircraft, the hard-landing detection system comprising:
a landing gear assembly comprising:
a wheel assembly having a wheel,
a shock strut mechanically coupled to the wheel assembly,
a stroke position sensor coupled to the shock strut,
a gas pressure sensor coupled to the shock strut,
a wheel speed sensor configured to determine a wheel speed of the wheel;
a temperature sensor configured to determine a temperature of the shock strut;

a controller having a processor; and
a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the hard-landing detection system to perform operations comprising:
detecting, by the processor, a landing event;
performing, by the processor, calculations based on time dependent measurements, the time dependent measurements comprising a stroke profile of the shock strut from the stroke position sensor, a gas pressure from the gas pressure sensor, and the wheel speed from the wheel speed sensor, wherein the performing the calculations includes deriving a maximum axle drag load at least partially from the wheel speed;
comparing, by the processor, a maximum vertical load, the maximum axle drag load, and a minimum axle drag load to predetermined envelope for vertical loads and axle drag loads; and
in response to at least one of the maximum vertical load, the maximum axle drag load, and the minimum axle drag load being outside the predetermined envelope for vertical loads and axle drag loads, determining, by the processor, the landing event is hard.