关键词: 水下爆炸, 燃气轮机, 载荷传递, 力学简化, 工程预报

Abstract: In order to study the characteristics of the shock wave loads induced damage to the gas turbine structure in an underwater explosion, the transfer law of the shock wave loads of the underwater explosion in the main structure of the gas turbine was investigated, and the load transfer prediction was made for the gas turbine through the equivalent mechanical model. For the finite element simulation acceleration signals measured on the transfer path in the gas turbine, the empirical mode decomposition method and the corresponding Hilbert Huang transform were used to analyze the time-frequency domain and energy distribution of the signals. The results showed that: for the underwater explosion induced shock wave loads, the frequency information and load intensity can be obtained by the Hilbert-Huang transform and empirical mode decomposition method; the shock wave energy along the transfer path in the gas turbine varies with the load; as the transfer distance increases, the proportion of high-frequency energy decreases, which corresponds to the stress response of the gas turbine; at the same time, the mechanical model of the gas turbine can predict the load transfer of the gas turbine. The findings of this study could provide insights into the protection of the gas turbine against impact.

Key words: underwaterexplosion, gasturbine, loadtransfer, mechanicssimplification, engineeringprediction