Vibration and rattle impact due to low frequency noise investigated at dulles airport

The data acquisition conducted at IAD is the very beginning of the LFN study. The recordings made insure that there are an adequate variety of aircraft type and number of events to provide a thorough analysis. Preliminary findings show the difference between the house responses. These differences will be investigated further to better understand the impact upon humans and the effects of house construction on attenuating the impact of the noise events. Though the original rattle design did not produce rattle in either location, the loose window in the stone house, as well as the modified rattle design, provided the opportunity to capture rattle signatures on both the indoor microphone and the HEAD system for a wide selection of events. Further work is planned for a subjective study of annoyance for the rattle signatures that were captured at the stone house. These recordings, as well as signatures without rattle, will be presented to subjects for evaluation. Objective metrics will be calculated for signatures used in the jury evaluation, and these metrics will be correlated with subjective ratings to assess the metric's ability to predict rattle impact. The findings will assist in identifying metrics that best correlate with the human perception of rattle.