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通过对一个结构模型在空气中和水下的动特性的研究，探讨了由结构在空气中的模态参数和水的附加质量预测结构在水下的模态参数的频响函数综合法，用以替代实体结构在水下的动特性试验。应用这种方法预测得到了结构在水下的模态参数并与结构的湿模态试验结果进行了对比。研究结果表明，对于所研究的梁形结构，不考虑水的阻尼，将水对结构的影响考虑成为附加质量，应用频响函数综合法预测结构在水下的模态参数是可行的
By studying the dynamic characteristics of a structural model in the air and underwater, the synthesis of the frequency response function of modal parameters under water is studied. The modal parameters in the air and the additional mass of water are discussed. To replace the physical structure under the dynamic characteristics of the test. Using this method, the modal parameters under water are predicted and compared with the results of wet mode test. The results show that for the beam structure studied, the effect of water on the structure is considered as an additional mass irrespective of the damping of water. It is feasible to predict the modal parameters of the structure under water by the comprehensive method of frequency response function