The Boeing Company

Yi Lu

David George Miller

Michael D Malason

Jesse K Senyo

Chandrakant Patel

Methods and apparatus for generating usage severity indices are disclosed herein. An example apparatus includes interface circuitry, machine readable instructions, and programmable circuitry to at least one of instantiate or execute the machine readable instructions to determine a first usage severity index for a drive system of an aircraft based on engine torque data, determine a second usage severity index for a rotor system of the aircraft based on cruise guide indicator data, determine a third usage severity index for a pylon structure of the aircraft based on flight regime data, and generate a flight-based usage severity index for the aircraft using the first usage severity index, the second usage severity index, and the third usage severity index.

Methods and apparatus for generating usage severity indices

A bias correcting phase compensating rate limiter to control movement of a device may include a switching arrangement adapted to reverse a polarity of an error signal in response to a set of predetermined conditions that may include a commanded rate of movement of the device exceeding a rate limit capability of the device; a time rate of change of an input signal to the rate limiter being opposite in polarity to a difference between the input signal to the rate limiter and an output signal from the rate limiter; and a time rate of change of the input signal to the rate limiter being opposite in polarity to a difference between the output signal from the rate limiter and a signal corresponding to a pre-specified neutral or trim position of the device.

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Media, PA, United States of America

Yi Lu