Investigation of Aircraft Noise Metrics

Analysis of Certification and Community Noise Metrics

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Abstract

Aircraft noise is quantified in the aviation industry using the Effective Perceived Noise Level (EPNL) metric. In contrast to this community noise planning makes use of A-weighted decibel metrics such as LA and SEL. This research investigated the relationship between EPNL and the A-weighted metrics LA and SEL. This project was coupled with a need for aircraft noise estimation capabilities within the Aircraft Noise & Climate Effects (ANCE) and the Flight Performance & Propulsion (FPP) departments. For this purpose an aircraft noise simulation framework was created using available tools within both departments. The core of this framework is the noise simulation program INSTANT which predicts aircraft noise based upon aircraft models generated by Initiator, engine models made in GSP, and flight trajectories simulated by a point mass model. These four programs were used in unison to simulate aircraft flyovers of ten aircraft. The results of these simulations were analysed to determine the relationship between the three metrics. It was found that there is a strong relationship between the three acoustic metrics. It can be said that one could focus noise reduction efforts on one metric and expect to achieve similar results for the other two metrics. Furthermore, it was shown that the simulation framework offers many fascinating research topics at both the ANCE and FPP departments.