METHOD AND SYSTEM FOR DETERMINING FRICTION COEFFICIENT µ FOR AN AIRCRAFT LANDING EVENT

摘要

The present invention provides a method and system of determining the ground-to-tyre friction coefficient for an aircraft landing event, the method comprising: ° providing a plurality of aircraft data parameters (2) including air craft vertical acceleration to an aircraft computational model and repeatedly modelling the landing event using the aircraft computational model (4) by varying one or more initial conditions of the aircraft model until a best match between a modelled value of aircraft vertical acceleration and the provided value of aircraft vertical acceleration is determined; ° providing the aircraft computational model (4) initial conditions associated with the best match of modelled and provided aircraft vertical acceleration values to a landing gear computational model (12) and also providing a strain value (14) derived from a first sensor located on the aircraft landing gear to the landing gear computational model (12), the landing gear computational model (12) having a value for the ground-to-tyre friction coefficient as a variable condition; ° modelling the landing gear to generate a modelled strain value and comparing the modelled strain value with the measured strain value; and ° repeating the landing gear modelling step with a different value for the ground-to-tyre friction coefficient until a best match between the modelled strain value and the measured strain value is determined and outputting the respective friction coefficient value.