Dynamic Response and Armature Critical Velocity Studies in an Electromagnetic Railgun

Daneshjoo, Kamran; Rahimzadeh, Mohammad; Ahmadi, R.; Ghassemi, Majid

doi:10.1109/tmag.2006.887668

Cited by 45 publications

(18 citation statements)

References 8 publications

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“…Meanwhile, gouging only takes place when it reaches a certain gouge velocity threshold [6] which is quite close to the rail resonance's [7][8][9] , in consequence, the partial deflection caused by resonance may be the key factor for generating gouging.…”

Section: A Equations Of Dynamic Responsementioning

confidence: 99%

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Impact physics model and influencing factors of gouging for electromagnetic rail launcher

Zhu

Zhang

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Gouging is a damage mechanism that occurs on the surface of rails of electromagnetic railgun. The disadvantages of gouging include lowering efficiency of railgun system, decreasing life of rails and reducing direction accuracy of projectile. According to configuration and dimension of the experimental arrangement, analysis of rail vibration induced by hypervelocity sliding load and numerical solve of the dynamic response for rails have been accomplished. Based on numerical solve of the dynamic response for rails under hypervelocity sliding load, a gouging physics model of impact has been established in this paper, and gouging on the rail was successfully replicated in LS-DYNA. Through dynamic simulating, effect rule of influencing factors such as deflection bulge size on the formation of gouging and key phenomenon of gouge process were investigated. The results suggested that the obvious gouging would be avoided by lowering the maximal local deflection size in 0.5mm; the structure of smooth on the head of the armature and decrease of contact pressure between armature and rails can be utilized to alleviate the damage; during gouging process, maximal strain-rate of rail material could reach to 10 7 s -1 while the contact area and velocity of armature would fell greatly. This work would be a foundation of future effort of avoiding rail gouging during the launch duration.

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Section: A Equations Of Dynamic Responsementioning

confidence: 99%

“…The armature speed which will cause resonance is called as critical velocity, at this moment the dynamic response reaches its top, Timoshenko first inferred the critical velocity from equation (1) as [7] ( ) 4 2…”

Section: A Equations Of Dynamic Responsementioning

confidence: 99%

Impact physics model and influencing factors of gouging for electromagnetic rail launcher

Zhu

Zhang

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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“…When analyzing the railgun statics, supposing the Lorentz force that acts on rail is even loads and is distributed on the inner surface of rail, adopting Ansys software to analyze, under the pressure of rail, the deformation value of stress and bore shall be less than the designed value. When analyzing the dynamics, the package of outer tube can be simplified to support which can be located on continuous elastic base, the physic and material performance of rail and support limit the maximum armature speed, which is the critical speed [6]:…”

Section: Design Of Rail Structurementioning

confidence: 99%

Optimization design for rail structure of railgun

Tao

Zhao

et al. 2012

2012 16th International Symposium on Electromagnetic Launch Technology

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The requirements in the design of railgun are analyzed in connection with the working states including the action integral and armature speed of the railgun. Based on rated bore and current, the inductance gradient can be indirectly calculated by the way of calculating the maximum electromagnetic force by Ansoft software, and then the launching efficiency will be increased indirectly by optimizing the height and width of railway and improving the inductance gradient of railgun to get a maximum electromagnetic force.

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“…Eq. (6) is solved by the LaplaceCarson Integral Transformation method and results are given in Daneshjoo study [10]. The relations for shear and bending stresses are [6]:…”

Section: Proposed Model and Governing Equationsmentioning

confidence: 99%

“…The study by Nechitailo solved the deflection equation numerically. Most recently Daneshjoo has studied the dynamic response and the armature critical velocity for different armature velocities using an estimated inductance gradient (l') [10]. The results are given based on a Laplace-Carson Integral Transformation closed form solution.…”

Section: Introductionmentioning

confidence: 99%

Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

Ghassemi

Varmazyar

2008

International Journal of Impact Engineering

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Dynamic Response and Armature Critical Velocity Studies in an Electromagnetic Railgun

Cited by 45 publications

References 8 publications

Impact physics model and influencing factors of gouging for electromagnetic rail launcher

Impact physics model and influencing factors of gouging for electromagnetic rail launcher

Optimization design for rail structure of railgun

Stress analysis of the rails of a new high velocity armature design in an electromagnetic launcher

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