Armature Structure Research of a Synchronous Induction Coil Launcher
Armature is very important for a synchronous induction coil launcher which can transform the electric energy to kinetic energy and push the load forward. The structure of the armature will influence the kinetic energy conversion efficiency directly. This paper analyzes the armature structure of a capacitor-driven synchronous induction coil launcher. Length and thickness of the armature are analyzed that how these parameters influence the maximum velocity and system efficiency of the launcher. Current filaments model is used to calculate the motion characteristics of a tubular linear induction motors, which is verified by an experiment and finite-element code. Genetic algorithm optimizer is used to calculate the best trigger times of the coils and the maximum velocity under the conditions of different length and thickness of the armature. It is shown that when the armature mass is fixed, length and thickness of the armature will greatly increase the velocity of the armature. The best length of the armature should be almost 2–2.5 times the length of the coil. The best thickness of the armature could be estimated by skin depth.
Design and testing of a 15-stage synchronous induction coilgun
An improved large-caliber synchronous induction coilgun was tested to demonstrate the launch of 120-mm projectiles. This induction coilgun is made of 15 identical coils. The coils are stacked end-to-end forming a barrel, and each coil is energized by the same pulsed power topology in sequence to generate a magnetic force to accelerate the projectile. Tracking of the projectile location during launching provided precise feedback to control. A computer simulation based on the viewpoint of FEA software is developed to predict the performance of the launcher system. 5-kilogram copper projectiles were accelerated from rest to 220 m/s through the 2.5-m launcher assembly with a projectile kinetic energy to capacitor stored energy efficiency of 14.5%. The 15-stage induction coilgun provides a significant improvement in the armature capture effect, system efficient and coil structure. Further experiments studies are being continued.
Addiction‐Specific CACREP Standards in Clinical Mental Health Counseling Programs: How Are They Met?
In 2009, the Council for Accreditation of Counseling and Related Educational Programs (CACREP) included training standards specific to addiction for clinical mental health counseling programs. This study surveyed CACREP-accredited program coordinators to determine how addiction-specific standards were addressed.