| With the rapid development of science and technology, traditional gun can hardlymeet people’s special demands of launching apparatus in the aspect of high velocity andenergy, because of its inherent limits. Electromagnetic railgun is an advanced acceleratingdevice. It can use electromagnetic force of the conductor to accelerate object to a highvelocity in a short time which can greatly improve the velocity and range. Electromagneticrailgun is widely applied in military, aerospace, scientific research and so on.In this dissertation, the two-turn augmented electromagnetic railgun is studied as thesubject. The dynamic analysis of railgun is carried out on the basis of theoretical analysisand finite element method.Firstly, the basic principle of the augmented electormagnetic railgun is studied. Theelectormagnetic force of the armature and rails are derived according to the magnetic fieldsuperposition principle and Biot-Savart’s law. The kinetic equation is established in thelaunching process and solved by using the Runge Kutta method. The change ofelectromagnetic force along with major parameters is discussed.Secondly, by using the electromagnetic simulation software Ansoft Maxwell, asimulation model of railgun is established and analyzed. The current density and thedistribution of magnetic induction of augmented electromagnetic railgun is got. Besides,armatures and the current data of both inside and outside guideways is analyzed.Comparing with the result of theoretical calculation, the correctness of the theoreticalanalysis is validated.Finally, by using ANSYS Workbench software, the dynamic analysis of augmentedelectromagnetic railgun is analyzed. The equivalent stress and deformation distribution ofmain structure are obtained.. Based on the results of dynamic analysis, using orthogonalexperimental design method, the parameters of fixed structure optimization design iscarried out. The maximum equivalent stress and deformation of fixed structure areeffectively improved. |
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