Thermal and mechanical stress in induction coilguns

Becherini, G.; Raugi, Marco; Tellini, Andrea

doi:10.1109/20.738390

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Compact, durable and highly mobile power generators and motors are the necessity to the success of all electrical systems for military functions [1,2]. Due to its potential military application, extensive research has been conducted for Electric Machinery (EM) structural design, analysis, and mechanics on creep, fracture and fatigue features [3][4][5][6][7][8][9]. Because of the complex conductor winding geometry and the heterogeneity of the conductor and the composite insulations, the EM system usually has to be analyzed using numerical techniques, of which finite element method is most widely used.…”

Section: Introductionmentioning

confidence: 99%

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Sun

Tzeng

2003

Journal of Composite Materials

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A homogenization modeling to predict the effective mechanical properties of electric machinery composite conductor consisting of metallic core with cooling channel, and multi-layer of insulating materials was presented. A two-level homogenization scheme to model complex composite with multi-phase materials and the validation of using finite element method was developed. Composite cylinder assembly model was adopted in the Level 1 homogenization for the metallic core and the cooling channel was analyzed as a fiber void with null material properties. The effective mechanical properties of the composite insulation layers were homogenized by smearing the properties of the multiple insulation layers of bonding, insulation and insulationfiber-reinforced composite. Level 2 homogenization derived nine effective mechanical constants for conductor through a combined homogenization sequences. The good comparisons between the analytical predictions and the results obtained from the finite element analyses demonstrated the applicability of the model.

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Section: Introductionmentioning

confidence: 99%

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Sun

Tzeng

2003

Journal of Composite Materials

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“…Changing the structure of the driving coil account for the magnetic force and heat during launching [9]- [11]; adjusting the structure and material of the armature improves heat and force [12]- [14]. With respect to the inherent characteristic of synchronous induction coilgun-armature capture effect that an opposite force is produced after the armature passes through the driving coil, relative research reports are less published.…”

Section: Introductionmentioning

confidence: 99%

Investigation of armature capture effect on synchronous induction coilgun

Zhang

Guo

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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In order to obtain high velocity and high energy conversion efficiency on synchronous induction coilgun, the armature capture effect which is the inherent characteristic for the coilgun need to be analyzed. The reason for armature capture effect is firstly deduced and analyzed through lumped-element circuit model, and then the quantificational result is obtained based on the field-circuit coupled model. According to the analytic result, the method to minimize the armature capture effect is proposed from the viewpoint of the magnetic couple between the driving coil and armature. Several measures are analyzed through the finite element simulation. The simulation result shows that adjusting the power parameters, such as adding the capacitance or initial voltage, and decreasing the crowbar resistance, and adjusting armature parameters, such as decreasing the mass or changing the structure, can minimize the armature capture effect and increase the system efficiency. The measures are validated through a 4-stage induction coilgun. Comparing the experimental result with the simulation result, adjusting the armature parameter which minimizes the armature capture effect accords with the fact well. It provides valuable reference for induction coilgun design.

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“…Based on the current sheet model, multisection coilguns were designed [19], [13], and gyroscopic stabilization was studied [20]. By solving the modified Bessel equation, Reference [21] defined a procedure for the design of induction coilguns in order to obtain thermal and mechanical stresses that do not exceed the allowed values in the sleeve, and then determined the flux, the current density, the propulsive force for each section, the number of sections and their length.…”

Section: A Current Sheet Modelmentioning

confidence: 99%

Study of traveling wave tubular linear induction motors

Haghmaram

Shoulaie²

2004 International Conference on Power System Technology, 2004. PowerCon 2004.

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In this paper, we review some major research results in Traveling Wave Tubular Linear Induction Motors technology, based on 'open literature"publications, which were obtained in the world in the last decades. One database analysis shows that coil launchers are covered in 68 of over 1000 electromagnetic launcher papers published, referred to 53 of them in this paper. The research program includes studies of history, types, applications, theories and analysis, design, and power conditioning of coil launchers with emphasising on traveling wave induction (Linear Induction Launcher) one. In the theories and analysis section, a preview i s given of current sheet model, current filament model, finite element method, and wavelet transform. In the design section, local and global optimisation algorithms and designing results is reviewed. In the fmal section, we review power conditioning of Capacitor Driven Coilguns and Generator Driven Coilguns, and concepts of "Magnetic Flux Compression" for generating pulses required to efficiently drive the coil launchers and LLDouMc+Fed Induction Launchers".

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Thermal and mechanical stress in induction coilguns

Cited by 10 publications

References 8 publications

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Investigation of armature capture effect on synchronous induction coilgun

Study of traveling wave tubular linear induction motors

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