Research On Impact Dynamics Model Of Support Structure Of A Large Gas Turbine

The anti-impact performance of the military ship equipment system determines the combat effectiveness and vitality of the ship,and has a crucial influence on the outcome of a naval battle.Therefore,in order to improve the impact resistance of shipborne equipment,it is necessary to carry out impact tests on key equipment.For smaller and lighter weight equipment,the impact machine is used for testing,and the medium and large equipment needs to be tested on the floating impact platform.At the beginning of the development of medium and large-scale equipment,the relatively weak components of the equipment will be mentioned,and the multiple equipment tests to evaluate individual components will inevitably consume a lot of financial and material resources.In this context,this paper takes the support structure of a large gas turbine for ship as the research object,and proposes a component test method based on the impact response equivalent gas turbine support structure.The new trend and method are provided for the impact test of key parts of large and medium-sized ship equipment.In this paper,the research methods and progress of impact resistance of marine gas turbines at home and abroad are analyzed in detail based on the research status of shock resistance methods of naval equipment.According to the actual engineering requirements,three groups of support structures of a large naval gas turbine are analyzed by using local analysis method.Finally,the rear support structures withstanding more harsh environment are selected as the research object.Considering the feasibility of component impact test,a similar test model of the rear support structure should be established.Firstly,based on the similarity theory,the basic similarity between the original model and the similar test model is analyzed,and the similarity transformation relationship between the impact response of the original model and the similar test model under the impact load is deduced according to the similarity criterion.Then,through the analysis of the boundary conditions and the impact environment of the back-braced structure,the scale test model of the back-braced structure is established.The relationship between the inherent characteristics of the original model and the scaled test model is verified by finite element software,and the correctness of the modal analysis results of the scaled test model is verified by vibration test.Secondly,the similarity between the shock response of the rear support structure and the numerical simulation response of the scaled similar model in the marine test of gas turbine is analyzed.The results show that the scale test model can reflect the impact response of the original back-braced structure to a certain extent.Finally,the impact test of the scale test model of the back-braced structure is carried out.At the same time,the equivalence of the impact response between the original model numerical simulation results,the scale test model test results and the numerical simulation results is verified.The results show that the scaling test model can predict the impact response characteristics of the original model.The weak parts of the back-braced structure are obtained through the destructive impact test of the scale test model,which provides important guidance for the optimal design of the impact resistance of the back-braced structure.