Summary of SEA (Copied from my original sina blog)

(The source is in Svante's lecture notes and presentations)

(lecNotes 1.1)

SEA formulation:
1. Subdivide the investigated structure into SUBSYSTEMS
2. The power balance equation(conservation of energy, and steady state is considered)

Coupling power proportionallity
'(1.3) states that the net energy flow is proportional to the diffence in energy per mode in connected subsystems'

page 2-4: C is a property of only the considered connections and the elements in this connection. any third element elsewhere in the structure won't change C, (but of course the energy balance.)

SEA parameters, using them flexibly!
P_dis = eta*omega*E = eta*omega*n*e_hat = M*e_hat
P_coup = eta_coup * omega *(E1 - E2) = eta_coup * omega * n *(ehat1 - ehat2) = C (ehat1-ehat2)


ROOM

1, Check the coincidence frequencies!
2, If necessary, reduce the unknowns by assuming that Pin = Ehat*M in the first room.