Statistical Energy Analysis (SEA) was first used in the 1960s in the US space programme to determine the vibration response of aerospace structures such as the Saturn V to launch noise. In 1967- 1969, Crocker, at Liverpool University, derived a theoretical approach using SEA to predict the sound transmission through finite single and double panels. SEA relies on several results, such as the modal density and the acoustic energy density of systems. One additional result is the assumption that the energy flow between two coupled systems is proportional to the modal energy difference between the two systems. In SEA, although the panels and air spaces are assumed to be finite, and modes are assumed to exist in the structures, space-time and frequency averages are made early in the analysis. This enables much simpler solutions to be found than in classical modal analysis theory. The traditional method of measuring transmission loss requires the use of a very expensive transmission suite consisting of two vibration-isolated reverberation rooms. The incident sound power is deduced from an estimate of the spatial average of the mean square sound pressure in the source room on the assumption that the sound field is diffuse, and where, in addition, the reverberation time must be determined. In 1980, Crocker at Purdue University, was the first to describe a new method for the determination of the transmission loss of panels. This method involves the measurement of the incident and transmitted sound intensities. The incident intensity is determined from measurements of the space-averaged mean square sound pressure (prms2) in a reverberation room on the source side of the panel. The transmitted sound power is determined directly from measurements of sound intensity in the receiving room
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