Electromagnetic launcher control using finite state machines

The authors show the continued viability of sequential finite state machines (FSMs) as a means to control the sequencing of electromagnetic launcher (EML) systems. While computer-controlled sequencing is an attractive alternative, FSMs are easy to design, inexpensive, and reliable. Several FSM controllers are currently in use for the long duration EML experiments at the Hypervelocity Research Facility, Eglin Air Force Base, Florida. The authors discuss basic system design, with reference to design procedure and systems interfacing. Flexibility and the fail-safe nature of the FSM (i.e., system interrupt capability) are also discussed. Where requirements include repeatability, reliability, ease of operation, relatively low cost, and flexibility, the FSM is presented as a reasonable alternative to more expensive computer-based systems