Numerical Simulation On Shock Resistance Analysis Of Marine Gas Turbine

In naval warfare, with the development of underwater weapons, non-contact underwater explosions growing threaten the security of warship equipments. As a power installation, the shock resistance capability of gas turbine is directly related to survivability and battle effectiveness of a warship. So it is of great significance to study shock resistance characteristics of gas turbine using numerical simulation methods.In this paper, the shock resistance numerical simulation of gas turbine and researches on its dynamic responses under shock loads are carried out using ANSYS software based on the structural characteristics of gas turbine, combined with relevant theories and numerical methods (equivalent static force method, dynamic design analysis method and time domain simulation method) of shock resistance analysis for warship equipments. Finally the methods to improve the shock resistance of equipments are obtained. The results can provide some reference values for shock resistance researches on marine equipments.Firstly, the finite element modeling techniques of gas turbine are studied according to the structural characteristics of marine equipments, including the simplification of the geometrical model, finite element meshing techniques, model validation and simulation of vibration reduction and shock resistance components.Secondly, the basic theories of equivalent static force method, dynamic design analysis method and time domain simulation method are studied. The three shock resistance analysis methods are applied respectively to the gas turbine vertically, transversely and longitudinally. According to the shock response of the turbine, weak links of the turbine are checked with the national military standard, and the mounts are conducted shock resistance design. In order to full understanding of the structural dynamic response, a number of load cases are set in time domain simulation.Finally, the three shock resistance methods, namely, equivalent static force method, dynamic design analysis method and time domain simulation method, are compared, including their shock input and results output. The advantages, disadvantages and scope of application of the three methods are summarized, which can be helpful for the appropriate choice of marine equipment design methods.