The invention provides a high-frequency local response indication method for a sound-
solid coupling structure. A
finite element method, a
modal power flow equilibrium equation and a local energy indication theory are combined to indicate the high-frequency local response of the sound-
solid coupling structure, the
finite element method is used for obtaining the displacement
modal vibration mode ofa structure subsystem on a
coupling edge, the stress
modal vibration mode of a sound cavity subsystem on the coupling edge and the inherent frequency and the modal quality of the subsystem, a
modal coupling loss factor between subsystems is calculated, and the modal
power flow equilibrium equation is established and solved to obtain the modal energy of the structure subsystem. Finally, the local energy indication theory is used for solving the local energy response of the structure subsystem, and a local stress /
strain response is solved through a relationship between the
strain energy and thestress strain of an
isotropy material. By use of the method, the high-frequency local response indication method for the sound-
solid coupling structure can be accurately indicated, and the problems that
discretization methods including a traditional
finite element method, a
boundary element method and the like are low in calculation efficiency and each
hypothesis of a statistical energy analysismethod can not be completely satisfied usually in
engineering application and is difficult to obtain the local energy of the subsystem can be solved.