Fuzing
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Fuzing. Naval Weapons Systems. Introduction. Why do we have a fuze? Trigger explosive reaction Keep weapon safe when not needed Must be reliable and dependable Safing and Arming Mechanism. Functions of the Fuze. Keep weapon safe Arm weapon Recognize or detect target Initiate detonation

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Fuzing

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Fuzing

Fuzing

Naval Weapons Systems


Introduction

Introduction

  • Why do we have a fuze?

    • Trigger explosive reaction

    • Keep weapon safe when not needed

  • Must be reliable and dependable

  • Safing and Arming Mechanism


Functions of the fuze

Functions of the Fuze

  • Keep weapon safe

  • Arm weapon

  • Recognize or detect target

  • Initiate detonation

  • Determine direction of detonation

    • Special Fuzes only


Basic fuzing system

Basic Fuzing System

Warhead

Target

Detecting

Device

TDD

(sensor)

Safing

And

Arming

Device

Warhead

Explosive

Output

Lead

Detonator


Target detection device

Target Detection Device


Target detection device four basic categories

Target Detection Device (Four Basic Categories)

  • Impact or Contact

  • Ambient - Environmental factor

  • Timer

  • Proximity


Fuze classification by fuze operation

Proximity Fuzes:

Active

Semi-Active

Passive

Timed Fuzes

Point Detonating Fuzes

Delay Fuzes

Command Detonated Fuzes

Fuze Classificationby fuze operation


Proximity fuzes

Proximity Fuzes

Active

Semi-Active

Passive


Safing arming mechanism

Safing & Arming Mechanism

  • Safety & Arming Sensor:

    • Barrier between the TDD and the warhead

    • Can be physical or mechanical


Activation forces

Activation Forces

  • Used to arm the warhead

  • Time

  • Acceleration (Setback)

  • Deceleration (Creep)

  • Centrifugal

  • Impact


Redundancy in fuze system

Redundancy in Fuze System

  • Safety - Devices placed in series in firing path for safety.

  • Arming - Components placed in parallel in firing path for arming & firing reliability.


Redundancy in fuze system1

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


Questions

Questions?


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