Structural Improved Design Of MV-level Marx Generator

With the high power of pulse power technology,many requirements have been put forward for high power Marx generators such as integration,strong structural robustness,easy assembly and maintenance.According to the working efficiency requirements of MV-level Marx generators,this paper analyzes the structural characteristics of the original MV-level Marx generators.The layout of the internal core of the cavity is changed from 6 rows of zigzag lines to coaxial series.Switch,design of new core unit,design of modular installation of core unit,improvement of core support structure to make it movable,cavity structure changed from single diameter to gradual change.The final design is an easy-to-assemble,overhaul,and movable MV-level Marx generator structure(the core structure needs to meet the random vibration fatigue test requirements of 3200 km road transport).The custom capacitor model was simplified,and calculations and experimental modal analysis were performed.The simulated low-order mode shapes are consistent with the experimental results,and the details of the modeling and the actual structure are different.The polypropylene film and the electrolyte are both non-linear,resulting in deviations in the highorder mode frequencies.There is no difference in the mode shapes in the orthogonal test results of different material parameters,indicating that the parameter characteristics of the structure do not affect the modal modes.Through the combination of numerical simulation and experiments,the Box-Behnken three-factor test method was adopted to obtain the equivalent and reliable material characteristic parameters.The finite element model of the core unit is established according to the actual equipment,and the random vibration response analysis of the MV-level Marx generator core unit under the vibration environment specified by GJB150.16A-2009 is performed by the finite element method.The random vibration response test of the actual equipment is performed,and the power spectrum response is compared and analyzed.The finite element model of the core unit is reliable in dynamic response.Analyze and calculate the vibration fatigue life of the dangerous component(L-type switch capacitor connection).The numerical analysis results show that the random vibration safety factor of the component during transportation is 2.04,and the structural fatigue life is less than half of the actual stress cycle.The core unit meets the design requirements for vibration fatigue life.For the multi-level core unit,the fatigue test of 3200 km road transport was carried out according to the vibration test requirements in GJB150.16A-2009.The U-shaped fixture is used to fix the three-level core unit,and the electrical continuity monitoring platform of the core unit is constructed.Circuit connectivity is stable.During the vibration test,no visible damage to the parts was found.Conduct electrical performance experiments on the switch.Under different air pressure levels,the DC withstand voltage value of the switch meets the design requirements.Finally,the multi-level core unit structure passed a random vibration test with a mileage of 3200 km.After visual inspection and electrical performance tests,all parts of the core unit were intact and met the design requirements.