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Multiscale Analysis of Electromechanical System
Published in Young W. Kwon, Multiphysics and Multiscale Modeling, 2015
The principle of operation of the simplest type of rail gun launchers is discussed. The rail gun launcher is a type of projectile weapon [1]. The basic structure of the rail gun launcher is shown in Figure 11.1. The simple rail gun launcher consists of two parallel conducting rails and an armature between the rails, which accelerates a projectile between the rails to a high speed in a short time using electromagnetic force. A large electric current flows to one of the two parallel conducting rails, travels through the conducting armature between the rails, and then goes back to the electric current source through the second rail. A projectile to be fired lies on the outer side of the armature and fits loosely between the rails. The electric current in the rails produces a magnetic field between the parallel rails. The magnetic fields are directed normal to the plane containing the two rails. The resultant magnetic field exerts a force on the armature due to the electric current that flows through it. This is called the Lorentz force [2]. The electromagnetic force points outward along the rails and pushes the projectile, accelerates it, and launches it at a very high speed. There are different types of rail guns to enhance the launch power. One is made using a solid armature, and another one is constructed of a plasma armature. In addition, there are series augmented rails or parallel augmented rails.
Naval Engineering and Ship Control Special Edition Editorial
Published in Journal of Marine Engineering & Technology, 2020
Electric weapons, such as railguns and high power lasers, and high power radars have driven the power requirement of naval platforms (Lowe et al. 2018). In order to achieve maximum flexibility of power supply between high power weapon, sensor and auxiliary systems on one side and propulsion systems on the other side, the development of integrated power systems started in the 90's and led to the application of integrated power systems on the UK Type 45 (Vanderpump et al. 2002) and US DDG-1000 Zumwalt class destroyers (Doerry et al. 2015), and on the UK Queen Elizabeth Class aircraft carriers (Sears et al. 2010; Hodge and Mattick 2008). While the introduction of railguns and high power lasers has been long anticipated, both are still in the experimental stage of development (Tate and Rumney 2017; McNab and Beach 2005; Meger et al. 2013). Nevertheless, these pulsed-power systems are expected on naval platforms over the next decade. A novel methodology to establish energy storage requirements, taking into account these anticipated pulsed-power systems is described in Rashkin et al. (2019), as an extension of the concept presented in Rashkin et al. (2018). After establishing the power system and energy storage requirements, control strategies are important to achieve maximum performance. A novel energy management control strategy for pulsed-power loads to maintain voltage stability and energy storage state of charge is presented in Edrington et al. (2019), which is an extension to the initial energy management concept presented in Edrington et al. (2018).