fuzing lesson 13. 3 components of a warhead? fuze explosive fill warhead case
Post on 21-Dec-2015
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TRANSCRIPT
FuzingLesson 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 fuse and fuze?– Fuse – simple pyrotechnic– Fuze – more complicated device
Functions of the Fuze• Keep weapon safe
• Arm weapon
• Recognize or detect target
• Initiate detonation
Basic Fuzing System
Target DetectingDevice TDD(sensor)
Detonator
Safing AndArming Device
ExplosiveOutput Lead
WarheadWarhead
Detonator
Target Detecting Device
Saving and Arming Device
Fuzing Catagorization
• Fuzes catagorized by the manner of fuze operation– i.e. by target sensor
• Fuze Catagories– Impact or contact– Ambient– Timer– Proximity
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
Impact Fuze
• Sidewinder• Mk-46 Torpedo*• Tomahawk• Harpoon
Ambient Fuze
• Senses particular environment– Depth charges– Air pressure
Mark XI
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….
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
Proximity FuzesActive
Semi-Active
Passive
Safing & Arming Mechanism
• Safety & Arming Sensor:– Barrier between the TDD and the warhead– Isolate detonator from the booster
Target DetectingDevice TDD(sensor)
Detonator
Safing AndArming Device
ExplosiveOutput Lead
Warhead
Activation Forces
• Used to arm the warhead• Time
• Acceleration (Setback)
• Deceleration (Creep)
• Centrifugal
• Impact
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.
Redundancy in Fuze System
Safety and Arming devicesarranged in series for safety
Detonators and TargetSensors arranged in parallel for reliability
A B A
B
AB
System
S SS S
S
F
F F
F
F
AB
System
S SS S
S
F
F F
F
FF F S S
Questions?