Anti-shock Analysis Of Gas Turbine And Improvement Of Support Structure

As the most important power equipment to the naval ship, gas turbines are weak in anti-shock capability, directly affecting the life-force of the ship. With the development of the computer, the numerical simulation methods have been the major approaches in studying the shock resistance capability of equipments on ships to the non-contact explosion. Based on the study about the anti-shock capability of gas turbine, this paper summarized and compared three classical numerical anti-shock methods, i.e., equivalent static method, DDAM, and time-domain dynamic analysis. According to the anti-shock analysis results, the structural anti-shock capability of gas turbine was improved using engineering optimization method.Firstly, the theoretical knowledge of three methods (equivalent static method, DDAM, and time-domain dynamic analysis) were studied, and the responses of the gas turbine under shock loads of vertical, transversal and longitudinal directions were calculated on the platform of NX-NASTRAN. The results of these three anti-shock methods were compared, and the advantages and limits of each method were pointed out. According to the responses, maximum stresses of the engine's support under the shock were assessed.Secondly, based on the results of the assessment, the structural capability of the engine's support was improved by engineering optimization method. The above three methods were applied to the improved structure, so as the original turbine structure. By comparing the response of the improved structure resisting shock with the original, it is showed that the support's anti-shock capability was improved.Finally, based on the results of equivalent static method, this paper reanalyzed the shock resistance of the gas turbine using sub-model method. The results indicated that the results of sub-model agree well with those of the original model, which validated the accuracy of the sub-model method performed on the platform of NX-NASTRAN.