Spatial reproduction of aircraft cabin noise in a full-scale mock-up

Reproduction in a mock-up of aircraft cabin noise in various flight conditions is an interesting tool for the prediction, optimization, demonstration and jury testing of interior aircraft sound quality. To provide a faithfully reproduced sound environment, time, frequency and spatial characteristics of the actual sound field should be preserved. This communication presents a cabin sound reproduction system in a full-scale mock-up of a CRJ 1000 Bombardier aircraft cabin. The reference sound field is based on a spatial capture of the CRJ cabin sound in various flight conditions using a 80 microphone array. The reproduction approach presented here is based on multichannel equalization using regularized least-mean-square minimization. The system involves inertial actuators mounted on the mock-up trim panels as well as bass shakers and a sub-woofer. The communication will discuss the system design as well as objective and subjective evaluation.