Design Tool for Artillery Safety and Arming Mechanisms Containing Clock Gears and a Straight-Sided Verge Runaway Escapement and Operating in an Aeroballistic Environment
Abstract
This investigation developed a computer simulation, which serves as a design tool for a complete safety and arming mechanism, which operates in a projectile that experiences spin, precession, and nutation. This mechanism contains a straight-sided verge runaway escapement, a two-pass clock gear step- up train, and is powered by a spin-driven rotor. The mathematical model of the escapement recognizes three motion regimes, i.e., coupled motion, free motion, and impact. The model of the clock gear meshes differentiates between round-on- round and round-on-flat contact of the mating teeth. The use as a design tool is furnished by the fact that the computer program allows an infinite variation in verge and rotor mass properties as well as in component center distances and clock tooth geometries with the circular arc and radial flank geometries. Similarly, the limits of operation of the mechanism when used in conjunction with a projectile having pathological aeroballistic motion may be observed. Clock gears, Safety and arming, Artillery, Escapement, M577 Fuze, Fuze Verge escapement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1994
- Accession Number
- ADA284311
Entities
People
- F. R. Tepper
- G. G. Lowen
Organizations
- United States Army Armament Research, Development and Engineering Center