Everything about Statistical Energy Analysis totally explained
Statistical Energy Analysis or
SEA is a method for predicting
vibration transmission in
dynamical systems made of coupled acoustic cavities and structures. The vibrational behavior of the system is described in the energy domain. The energy is here the
potential and
kinetic energy carried out by the modal
resonances of the dynamical system. To solve a problem with SEA, the system must be partitioned into "subsystems", for example regions of the system between which one can write a set of power-balanced equations that couples the power injected by the external loads (the sources) and the energies of the various subsystems.
SEA is popular in
aerospace and
automotive industries where various vibrational problems can be predicted at low cost and on a wide frequency range: random vibration levels of rockets and payloads structures at lift-off, sound transmission in car passenger cabins due to various noise sources (exhaust, engine...).
SEA has originally be stated by R. H. Lyon in early 60s where he found the power exchange relationship between two coupled spring-mass oscillators . Further on, the theory has been extended to the coupling of continuous dynamic systems (beams, plates, shells) .
Vibrations are a ubiquitous problem for mechanical engineers which not only cause noise but also reduce life of machinery.Statistical energy analysis is a method of predicting vibro-acoustic response of dynamic structures.
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