Statistical energy analysis, SEA
Sound fields in rooms and mechanical vibrations in plates are examples of systems with a high number of modes, the so-called resonant systems. In case of combinations of two or more such resonant systems, it can often be advantageous to take a statistical approach in order to analyse the propagation and distribution of the acoustic energy in the coupled resonant systems. The method of statistical energy analysis (SEA) was originally developed by Lyon and Maidanik and applied for sound insulation by Crocker and Price and others. Even if SEA is a powerful tool, there are some general underlying assumptions that put restrictions and drawbacks on the methodology. The energy balance equation can be expressed by only one coupling loss factor, and is sometimes called the fundamental equation of SEA. The forced sound transmission through the wall cannot be derived by SEA since the normal modes of the wall are not involved in this transmission.