Radiation efficiency varying equivalent radiated power.

In this paper, an improved version of the classical equivalent radiated power (ERP) approximation is proposed based on principled physical arguments. A geometry-, frequency-, and vibration pattern-dependent approximation of radiation efficiency is developed and used as a corrective factor for the classical ERP approximation. The proposed method called "radiation efficiency varying equivalent radiated power" (revERP), is shown to greatly improve the accuracy of classical ERP at low Helmholtz numbers, while attaining the accuracy of classical ERP at high Helmholtz numbers. The revERP method is exemplified on several components of industrial complexity, and shows a valuable alternative to full vibro-acoustic finite element analysis for early-stage assessment of acoustic performance.