Frequency dependent selection of control sensors in multi-channel acoustic control

This paper addresses the problem of reproducing a random pressure field with an array of loudspeakers through direct field acoustic tests. Such field should be representative of the fairing interior acoustic levels generated by the dynamic loading during the launch of a spacecraft. The replication of the acoustic field with loudspeakers is highly dependent on the control strategy used to design the test setup and the signals feeding the acoustic sources. In this paper, functional analysis and spectral decomposition theories are used to study the benefit of applying pre-test analysis to set the most optimal control parameters. This paper builds on previous works and assesses the performance of a methodology for frequency dependent distribution of control sensors, which are selected automatically through numerical pre-test analysis. The methodology is evaluated through a numerical model of a direct field acoustic test setup.