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Fuzing

Fuzing. Lesson 13. 3 Components of a Warhead?. Fuze Explosive Fill Warhead Case. Introduction. What is a fuze? Devise designed to detonate, or set forces into action to ignite or detonate the charge under specific conditions What is the difference between fu s e and fu z e?

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Fuzing

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  1. Fuzing Lesson 13

  2. 3 Components of a Warhead? • Fuze • Explosive Fill • Warhead Case

  3. Introduction • What is a fuze? • Devise designed to detonate, or set forces into action to ignite or detonate the charge under specific conditions • What is the difference between fuse and fuze? • Fuse – simple pyrotechnic • Fuze – more complicated device

  4. Functions of the Fuze • Keep weapon safe • Arm weapon • Recognize or detect target • Initiate detonation

  5. Basic Fuzing System Warhead Target Detecting Device TDD (sensor) Safing And Arming Device Warhead Explosive Output Lead Detonator Detonator Target Detecting Device Saving and Arming Device

  6. Fuzing Catagorization • Fuzes catagorized by the manner of fuze operation • i.e. by target sensor • Fuze Catagories • Impact or contact • Ambient • Timer • Proximity

  7. Impact Fuze • Contact • Detects weapon’s first impact with an object • Output initiate the detonator • Typical Sensor mechanisms • Displacing an inertial mass • Stressing a piezoelectric crystal • Short-circuiting a coaxial transmission line • Interrupting an electrical circuit

  8. Sidewinder Mk-46 Torpedo* Tomahawk Harpoon Impact Fuze

  9. Ambient Fuze • Senses particular environment • Depth charges • Air pressure Mark XI

  10. Timer/Delay Fuze • Preset time elapse a timing devise will send a fire signal to the detonator • Mechanical, electronic, igniferous, or chemical • Can be combined with impact fuze….

  11. Proximity Fuze • Most complex class of fuze • Developed by US and England early in WWII…why? • Called Variable Time (VT) to mask their true nature • Can be Active, Semi-active, or passive • Electromagnetic – range gates • Magnetostatic – presence of magnetic flux • Acoustic – acoustic distrubances • Seismic – similar to acoustic, however lower bandwidth and extremely sensitive

  12. Proximity Fuzes Active Semi-Active Passive

  13. Safing & Arming Mechanism • Safety & Arming Sensor: • Barrier between the TDD and the warhead • Isolate detonator from the booster Warhead Target Detecting Device TDD (sensor) Safing And Arming Device Explosive Output Lead Detonator

  14. Activation Forces • Used to arm the warhead • Time • Acceleration (Setback) • Deceleration (Creep) • Centrifugal • Impact

  15. Redundancy in Fuze System • Safety - Devices placed in series in firing path for safety. • Reliability - Components placed in parallel in firing path for arming & firing reliability.

  16. Detonators and Target Sensorsarranged in parallel for reliability Safety and Armingdevices arranged in seriesfor safety A A B B A F F A S S F F S S B F S S F B F S S F S F F F System S S S F System Redundancy in Fuze System

  17. Questions?

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