Patent ID: 9457913
Filing Date: 2016-10-04
CPC Classification: B64D,B64F,G01M

Claim Text:
1. An aircraft jitter detection system for detecting jitter in the form of unstable aircraft structural oscillations, comprising: a jitter detection apparatus, arranged to detect accelerations of pitch and yaw of the aircraft; a data acquisition apparatus, arranged to obtain accelerations in two directions detected by the jitter detection apparatus; and a jitter determination apparatus, arranged to extract frequency spectrum and energy information of the jitter according to the accelerations in two directions obtained by the data acquisition apparatus, and compare the extracted frequency spectrum with a threshold value and the energy information with another threshold value to determine whether the aircraft jitters; wherein the jitter detection apparatus, the data acquisition apparatus or the message generation apparatus initiates detection of jitter during the climb or cruise stage of the aircraft; and wherein at the time when the aircraft starts to clime or around 10 seconds or 20 seconds after the aircraft starts to climb, the jitter detection apparatus, the data acquisition apparatus or the message generation apparatus initiates detection of jitter; or when the aircraft starts to climb at a speed larger than 260 knots, the jitter detection apparatus, the data acquisition apparatus or the message generation apparatus initiates detection of jitter; or when the aircraft is in a steady-state cruise condition or around 40 seconds after the aircraft is in a steady-state cruise condition, the jitter detection apparatus, the data acquisition apparatus or the message generation apparatus initiates detection of jitter.