| 摘要 |
<p>The takeoff weight of an aircraft is computed from measures of the thrust of the engines provided by sensors (11, 12, 13) and the forward acceleration provided by an accelerometer (10) of the aircraft detected over a time period when such acceleration is at a maximum following brake release on the runway. A major variable that must be considered is the coefficient of rolling friction of the landing gear of the particular aircraft involved and other factors inducing ground roll drag. The present invention calculates this variable as a function of engine thrust and manifest weight (36) for each takeoff of the aircraft and updates weighted filter values thereof (28) for use during subsequent takeoffs. For each takeoff, therefore, an average value of rolling friction is used to calculate takeoff weight, which average value becomes more nearly the actual value for the existing condition of the landing gear.</p> |
