Mathematical Model for the Separation of Gust and Manoeuvre Loads of Civil Aircraft

摘要

Ignoring the unsteady lift functions, the normal acceleration response of an aircraft at its centre of gravity to a simplified turbulence spectrum varying as frequency to the power -5/3 were studying. It is shown that the pitching influence usually reduces the response at long wavelengths from that produced by heaving alone. This influence was relatively small in piston-engined aircraft but has generally become greater as aircraft have developed. The increased response at long wavelengths in modern aircraft makes the problem of separating maneuvres from gust response more difficult but it is attenuated somewhat by the pitching contributions to the response. Experimental studies on a T33, on a Concorde and on a Transall indicate that a band frequency exists where the manoeuvres and turbulence responses are both small so that a filter within this band should separate one type of response from the other.