To optimize erosion-free rail accelerator launch of solid brush armatures, a twodimensional and an analytical model are used to study the temperature distribution, the coefficient of friction and the transitioning behaviour of Ushaped solid armatures made of copper, aluminium, molybdenum and titanium during electromagnetic launch. In order to verify the insights gained from these theoretical studies experimentally, recently developed diagnostics are applied. Especially, the growth potential of solid armatures for weapons applications is highlighted by considering such materials as titanium and molybdenum.
Abstruct-Fibre armatures have been studied both dynamically and statically to gain insight in their electrothermal and mechanical behaviour.In the first part of this paper, the results of launch experiments with single and multi-segment copper and molybdenum fibre armatures integrated in carbon-fibre reinforced launch packages are discussed. The launch experiments with Cu fibre armatures showed an improved reproducibility and a higher transition velocity. The poor results of the launch experiments with the MO fibre armatures thus far, are explained with results of armature compliance and resistance measurements.In the second part, results are presented which are obtained from static experiments in an armature test bed. Using miniature B-dot probes and Rogowski coils, the magnetic field diffusion into monobloc and fibre armatures with identical geometry has been studied. The results show a significant difference in diffusion behaviour between the two types of armatures. It appears that the magnetic field diffuses faster into the fibre armature.The experimental data are compared with the results of calculations of the magnetic field distribution in both armatures based on 2D-and 3D-finite element computer simuIations, The results of the 2D-simulations appear to confirm the measured results for monobloc and fibre armatures only qualitatively. The experimental results obtained with monobloc armatures agree with the results of the 3D-simulations in a quantitative sense.
Agency for Defense Development(udd) of' KoreuEight 300kJ modularized capacitor-banks have been constructed and tested. These modules are to be used as a driver of an electro-thermal chemical (ETC) gun. Each capacitor bank has six 22kV, 50kJ capacitors connected in parallel. A triggered vacuum switch (TVS-43) was adopted as the main pulse power-closing switch in each module. The module also contains a crowbar circuit made of three high-voltage diode-stacks, a multi-tap inductor and an energy-dumping resistor. The crowbar diode stack is fabricated in coaxial structure with two series 13.5 kV, 60 kA avalanche diodes and crowbar resistors. Operating characteristics of each module was investigated and improved. Every component of 300kJ module passed the reliability test successfully at the full charging voltage of 22kV. The maximum current of each module was about 150kA with a pulse width (JWHM) of 500us. Eight modules were installed and were combined to make a 2.4MJ pulse power system (PPS) in a transportable container. A PC based controller controls these modules. The signal connections are made using fiber optic cables to ensure the insulation and safety. A software control-program can select specific modules and can set charging voltages and firing times of each module freely. Some experiences and characteristics of the high current pulse generator in a resistive load and the ETC load are presented in this paper. M. Koops P. V. Gelder EPREC NetherluruLv Orguniwtion fiw Applied Srientifir Reseurch TNO E. V. Dijk Royul Nether1und.s NuvyThe power supply is a critical component in the development of systems for electric armament. The energy and power density of pulsed power supplies have to be increased for their successful integration in weapon platforms. In this paper, the related issue of efficient use of available energy is addressed. In the theoretical limit, the launch efficiency for rail accelerators amounts to 50 %. The remaining 50 % is stored in the rail accelerator as magnetic energy. In practice, part of the energy input into the breech is lost due to Joule heating of the rails and armature, lowering the launch efficiency to about 30 %. A doubling appears to be feasible when practical systems can be developed in which energy losses are minimised. Then, a reduction of the weight and volume of the power supply can be expected. Recovery of the magnetic energy stored in the rail accelerator and reduction of the Ohmic losses can be achieved by application of an augmented rail accelerator with rail cooling. In addition, the application of field augmentation results in lower electrothermal action requirements for the components, especially the armature. In the paper, the results of simulations of a pulse forming network for repetitive launch applications are presented. The efficiency of the proposed system is compared with a launch system using DES. 330
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