Electromagnetic Catapult Design And Dynamic Analysis Of Carrier-based Aircraft

The steam catapult is the main take-off ejection device for carrier conventionalfixed-wing aircraft carrier, but this device is noisy, cumbersome, energy-inefficient andcannot meet the needs of improving modern fighter performance in quality and speed.Electromagnetic aircraft launching system is dependent on the electromagnetic force (orthe Lorentz force) to achieve acceleration, it is a new launch mode that allows the carrieraircraft to reach takeoff speed within a short distance. Compared with the steam catapult,electromagnetic catapults have more uniformly acceleration, faster catapult, bettercontrollability, larger range output regulation and more relatively hidden emission. Andthis device can also reduce launching cost because of its higher efficiency and shorterpreparation period. Therefore, it is a great breakthrough of the traditional launchtechnology. As a more advanced technology than the current steam catapult on the aircraftcarrier, electromagnetic launch technology has been a research focus in many developedcountries.This paper focuses on the design and finite element simulation of electromagneticcatapult linear induction motor, which is used in the carrier-based aircraft electromagneticcatapult system. After an introduction of the basic principles of electromagnetic catapulttechnology, the design method of the linear motor was introduced; Then, fullsize long primary double sided linear induction motor was designed accordingto the carrier-based aircraft catapult technical requirements; Finally, a finite element modelwas created according to the mathematical model to monitor the electromagnetic fieldcharacteristics of the motor and the structural parameters of the motor on thecharacteristics of the linear motor thrust. Our research procedure and the main outcomesare as follows.(1) The thrust requirements of the motor was determined according to the thrustrequired by the aircraft carrier catapult carrier-based aircraft, the magnetic circuit for theejection motor was designed according to structure principle of the linear induction motorTwo-dimensional analytical model was developed for air gap magnetic field of the linearinduction motor.(2) Through rated parameters of the long primary bilateral linear induction motor, theelectromagnetic load was selected to determine the main dimensions of the motor, thegroove of the primary winding and the secondary dimensions, and then the magneticcircuit design and parameters were determined; Finally, the startup performance of themotor was verified.(3) Based on the linear induction motor electromagnetic theory, using finite elementsimulation software Ansoft as the model tools, a finite element model of the motor was created to, make a simulation analysis of the motor in the case of both no load and loadaccording to the results of the theoretical design calculations. Linear motor distribution ofmagnetic field lines was studied, and the magnetic the Miyun Figure, the air gapwaveform, loss and air-gap flux density waveform FFT were analyzed. The effects ofdifferent speeds on the performance of the motor were analyzed.(4) The impact of different structural parameters on the electromagnetic force of themotor was studied. The motor air gap, the primary groove width and groove depth,secondary length and thickness could be parameterized, and different secondary startposition was set to calculate the value of the corresponding motor thrust. Change patternsof the parameters of the motor structure due to different motor electromagnetic forces ofthe curve with were investigated.