Modeling freighter aircraft interior number.

Abstract

A freighter version of a commercial passenger airplane platform was developed. The new architecture includes an occupied space immediately aft of the flight deck and forward of the cargo space. A bulkhead separating the occupied space from the cargo space is designed to protect people from being compromised by cargo during a hard landing. Occupied space noise requirements affect the bulkhead design as it is a primary path of noise transmission from the cargo bay. Statistical energy analysis (SEA) noise models were developed to evaluate the noise performance of the bulkhead. Models were developed for ground test, flight test, and component configurations, respectively. The component model is described in a companion paper. A fourth, requirements model, was developed to demonstrate bulkhead noise compliance. The model development and correlation efforts are detailed in this document. SEA model results are shown to correlate reasonably well with the test data.