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

Claim 7:
8. A method of determining whether a landing event of an aircraft is hard, the method comprising:
receiving, by a controller via a stroke position sensor, a stroke profile as a function of time for a shock strut;
receiving, by the controller via a gas pressure sensor, a gas pressure in a gas chamber of the shock strut;
receiving, by the controller via a wheel speed sensor, a wheel speed of a tire in a landing gear assembly;
receiving, by the controller via a temperature sensor, one of a gas temperature, an oil temperature, or a shock strut temperature of the shock strut in the landing gear assembly;
calculating, by the controller, multiple time dependent functions based on the stroke profile of the shock strut, based on the gas pressure, and based on the wheel speed, wherein the calculating includes deriving a maximum axle drag load in the multiple time dependent functions at least partially from the wheel speed;
comparing, by the controller, the multiple time dependent functions to a respective predetermined envelope for axle drag loads and vertical loads to determine whether the landing event is hard; and
in response to at least one of the multiple dependent functions is outside the predetermined envelope for vertical loads and axle drag loads, determining the landing event is hard.