Dynamics Modeling And Simulation Of Four Found Rails Electromagnetic Railgun

The electromagnetic railgun has become more and more important in the future weapons development program. As a common electromagnetic railgun modified structure form,four round rails electromagnetic railgun enriches the application of electromagnetic railgun.It has smaller rail repulsive force,more reasonableheat distribution,which lead to reduce the ablation,higher armature impetus force.According to the existing structure of the four round rails electromagnetic railgun, this thesis mainly focus on armature movement and dynamic characteristics of armature and rail.This thesis has following chapters:(1)Mathematical modeling and analysis.This thesis gives the armature electromagnetic force in consideration of skin effect and without consideration of skin effect,power discharge model and the resistance force model respectively. This thesis establishes the differential equations and obtains the armature movement. This thesis also analyzes the influence of structure parameters of electromagnetic railgun on the motion characteristics.(2)System analysis.According to the research, this thesis puts forward the dynamic differential equations of electromagnetic railgun system, which leads to the movement characteristics of the armature. Researching parameters of electromagnetic railgun system on the armature launching and discharge characteristics of multistage capacitors fed railgun.(3)Finite element dynamic simulation.This thesis gives simplified repulsive force of the rail and contact theory between the armature and the rails. Through establishing ANSYS finite element dynamic simulation model, this thesis gets the stress and the radial direction strain of the railgun and the contact area at different armature locationes. This thesis obtains the mechanical characteristics of electromagnetic railgun while the armature is moving.Through lauching a series of researches on four round rails electromagnetic railgun,this thesis obtains the law of armature movement and dynamic characteristics of the railgun,which provides the theoretical basis for itself development.