Research On Using Of Statistical Energy Analysis For Complex Coupled Structure Under Multi-correlative Excitations

Statistical Energy Analysis is an effective method for predicting the medial-high frequency response on complex coupled structures. It is extensively applied in the fields of aviation, aerospace, automobile and ship, etc. When there are correlative inputs in the system, the traditional SEA is limit to resolve the problem of energy analysis for conservative and non-conservative system. In this paper, by using the dynamics model of two oscillates under the response on correlative excitations, thie paper has researched on statistical energy analysis of complex coupled structures when multi-correlative inputs acting on the system.By summing up the development and conditions of SEA, the assumptions and application scopes of the SEA have been researched on. Referring to traditional SEA this paper has also introduced the relevant parameters and the related concepts of the SEA. On the base of reSEArching on energy distribution and power flow of conservative and non-conservative system on correlative inputs, we have discussed the energy distribution of conservative and non-conservative system on multi-correlative importation, deduced the formulation of power balance and related item for power of complex coupled structure, and the principle of SEA about complex coupled structure on multi-correlative importation have also been established. Through introducing the correlative power flow, the conservative and non-conservative coupled system has been consolidated, and the non-conservative system was equivalent to conservative system. Using the theory of SEA, a new method was provided for treating with coupled damp in complex coupled structures.Objects for experiments have been designed and processed, and the testing system of multi-correlative excitations has also been set up. Considering the parameters of SEA is difficult to confirm, this paper has designed and set up the testing system about parameters of SEA, and have done experiment about the damping loss factors and coupling loss factors of the structure. Finally, the parameters of SEA were got. It indicates that the results coming from SEA that considering the relativity of the inputs inosculates well with the results of experiments, while the results from traditional SEA is so difference to the results of experiments.In the end, for the free damping vibration response signal of the two coupled oscillations intensive frequency component, a new method for estimating coupled coefficient of free damping vibration response signal has been put forward and the simulation has also been did. The result comes from simulation validates the correctness of the arithmetic.