Design and Implementation of Digital Filters for Analysis of F/A-18 Flight TestData

摘要

This technical memorandum describes the methods and computer programs used tospecify, design, and implement time-domain and frequency-domain FIR digital filters for use in the analysis of F/A-18 flight test data. Two bandpass filters covering the 10-20 Hz and 32-52 Hz frequency bands have been developed, and they can be used for analysing the two dominant modes of structural vibration response occurring on the F/A-18 empennage. A highpass filter with a cutoff frequency of 8 Hz was also designed for filtering strain gauge data for use in producing fatigue load sequences for coupon testing. The effects of bandpass filtering on the transient response of short-term vibrations lasting about one second have also been investigated, leading to the conclusion that FIR digital filters have a negligible effect on the transient response characteristics of short bursts of