水下爆炸冲击波载荷沿燃气轮机结构传递特征

Characteristics of Underwater Explosion of the Shock Wave Loads Transfer in the Gas Turbine Structure

为研究水下爆炸条件下冲击波载荷对燃气轮机结构的损伤特征,开展水下爆炸冲击波载荷沿燃气轮机主结构的传递规律研究,通过等效力学模型对燃气轮机进行载荷传递预报。针对燃气轮机传递路径上测得的有限元仿真加速度信号,使用经验模态分解法和与之对应的希尔伯特-黄变换对信号进行时频域分析和能量分布分析。分析结果表明:针对水下爆炸冲击波载荷,基于希尔伯特-黄变换及经验模态分解法可以得到冲击波载荷所包含的频率信息以及载荷强度等信息;沿燃气轮机传播路径的冲击波能量,随载荷传递距离的增加,高频能量占比有所降低,与燃气轮机的应力响应相对应;燃气轮机力学模型能够预测燃气轮机的载荷传递情况,该结果对燃气轮机抗冲击防护具有借鉴意义。

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.