Traditionally, in rectangular cavity research the fundamental physical understanding of cavity resonance is a handful of empirical equations. The authors have recently derived the cavity acoustic wave equation and the cavity hydrodynamic wave equation from Lighthill’s and Curle’s acoustic analogy wave equations. By changing the cavities boundary conditions with half span doors, in both doors open and one door closed configurations, the resulting pressure spectrum changes are attributable to the boundary condition changes and can capture the large frequency shift differences due to the door configuration changes. These results suggest these derived cavity wave equations are correct.

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