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AmmoTech > DS - GW Basic Bricks > Flashcards

DS - GW Basic Bricks Flashcards

1
Q

Classifications of GW (4+2)

xx

A

Strategic / tactical
Surface-to-Air (SA)
Air-to-Surface / Ground (AS/AG)
Air-to-Air (AA)

Anti-Shipping Missile (ASM)
Anti-Missile Missile (AMM)

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2
Q

Definitions of Guided Weapons

xx

A

A weapon system in which the warhead is delivered by an unmanned guided vehicle

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3
Q

Name the Basic Bricks (7)

xx

A
  • Structure
  • Propulsion
  • Guidance
  • Control
  • Auxiliary power
  • Payload (“armanent”)
  • Fuzing (“armanent”)
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4
Q

2 Parts of Structure

A

Airframe

Skin

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5
Q

What is the purpose of the skin on a guided

weapon? (3)

A
  • Gives Aerodynamic Shape
  • Protects Internal Parts
  • Adds to Rigidity and Stability of Missile
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6
Q

Forces Acting on GW (7)

xx

A
  • Vibration & resonance
  • Aerodynamic Lift
  • Aerodynamic Heating
  • Acceleration Loads
  • Thrust Loads
  • Transportation Loads
  • Drag/Dynamic Pressure
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7
Q

Define missile guidance.

xx

A

The ability to alter the direction of the flight of a missile after launch and able to do so until it is close to the point of impact

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8
Q

What are the three components of a guidance system?

xx

A

Tracking device
Computing device
Directing device

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9
Q

Name five types of guidance - Predetermined Guidance.

A 
Preset Guidance
Inertial Guidance
Terrestrial Reference
Radio navigation
Celestial navigation
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10
Q

What are the three types of homing guidance?

xx

A

Active homing
Semi active homing
Passive homing

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11
Q

What are the three phases of guidance?

xx

A

Launch phase
Mid course phase
Terminal phase

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12
Q

What is the purpose of the directing device

A

Means by which commands are sent to the missile

eg radio, radar, wire and laser beam

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13
Q

The propulsion system requirements? (4)

xx

A

Accelerate the missile from rest

Provide sustained thrust or adequate momentum for missile to reach its maximum range

Provide a consistent level of thrust under all conditions

Not interfere with the guidance or control system

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14
Q

What is propulsion?

A

That part of the missile which provides the power to move it from launch to target

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15
Q

A guided missile must travel at a high speed in order to do what 3 things?

A
  • Overtake and destroy a threat
  • Avoid enemy countermeasures
  • Reduce the time the missile is subject to atmospheric disturbances
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16
Q

What is jet propulsion?

A

A method of propelling a body by means of the reaction force produced by the discharge of matter from the propelled body

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17
Q

What are the two main functions performed by the nozzle on jet engines?

A
  • Restrict the volume of gas flow to keep internal pressures high
  • Convert heat energy of expanding gases into kinetic energy
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18
Q

What are the two basic types of engine?

A
  • Air dependent (jet)– atmospheric air is being used as the oxidiser
  • Air independent (rocket) – own oxygen is carried on board
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19
Q

What are types of air dependent engines?

A
  • Ramjet – diffusers
  • Turbojet – compressor
  • Pulse jet – flaps
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20
Q

What are the two main categories of air independent engines?

xx

A
  • Liquid fuelled

* Solid fuelled

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21
Q

What are the three phases of guidance missile propellant burning?

A
  • Boost phase
  • Sustainer phase
  • Coast phase
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22
Q

Disadvantages of Guided Weapons? (6)

A 
Cost
Reliability
Response time
Minimum range
Flight time
Back-up
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23
Q

Types of Controlled path guidance?

A

Command guidance
- Command to the Line of sight - manual
- Command off the Line of sight
Beam riding

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24
Q

Different Homing target approaches?

A
  • Pursuit course
  • Constant bearing
  • Proportional navigation
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25
Q

What is meant by the term “compound guidance?”

A

Using different types of guidance for different phases of trajectory of guided weapon

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26
Q

What is auxiliary power

A

All power required by missile in flight, other than the propulsive power

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27
Q

Main types of Auxiliary Power (3)

xx

A

Electrical
Pneumatic
Hydraulic

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28
Q

Aux power - Sources of pneumatic power (3)

A

Compressed air or gas

Propellant gases

Ram air

29
Q

When is hydraulic power preferable to other forms of auxiliary power?

A

When the components such as actuators operating control surfaces are subject to other high aerodynamic or high acceleration forces

30
Q

Two types of hydraulic systems

A

One shot system

Recirculatory system

31
Q

What is propulsion?

A

Part of the missile which provides power to move it from launch to target

32
Q

To measure effectiveness, guided missile must travel at a high speed IOT do what 3 things?

A

Overtake and destroy a threat
Avoid enemy countermeasures
Reduce the time the missile is subject to atmospheric disturbances

33
Q

What is jet propulsion?

A

A method of propelling a body by means of the reaction force produced by the discharge of matter from the propelled body

34
Q

3 phases of GM propellant burning?

A
  • Boost phase
  • Sustainer
  • Coast
35
Q

2 types of sensors used in GM?

xx

A
  • Gyroscopes

- Accelerometers

36
Q

2 types of gyroscopes?

xx

A
  • Free gyroscope

- Rate gyroscope

37
Q

What is an Accelerometer?

A

Determines the rate of change from a reference axis

38
Q

How many accelerometers are required for complete stabilization?

A

3

axes?

39
Q

What is a pick off?

A

Device that produces an electrical signal due to the mechanical movement of reference

40
Q

What are two basic types of pick off?

A
  • Variable resistance

- Variable reluctance

41
Q

What is the purpose of the electronic control unit (ECU)?

A

It receives a signal from the sensors that (the GM) requires correcting, then it processes the info and amplifies the signal to be sent to the servo motor……?

42
Q

What are the types of ECU? (3)

A
  • Amplifiers
  • Controllers or Shaping elements
  • Mixers
43
Q

What are the main components of a servo mechanism?

xx

A
  • Transducer
  • Control Valve
  • Actuators
44
Q

What do control devices do?

A

Produce the change in direction of the airframe

45
Q

What are the 2 basic principles that affect control?

A
  • Aerodynamic control

- Thrust vector control

46
Q

What is an aerofoil?

A

Body shaped for aerodynamic reaction without excessive drag

47
Q

What is a fin?

A

Aerofoil attached to provide directional stability

48
Q

What is a wing?

A

Aerofoil attached to missile to provide lift

49
Q

What is a control surface?

A

Aerofoil attached to GM to change attitude of GM

50
Q

What is a canard?

A

Configuration where control surfaces are forward of main support surfaces

51
Q

What is twist and steer?

A

Roll stabilization by 2 horizontal wings

52
Q

What are the methods of achieving variable thrust? (8)

A 
Gimballed machine
Flexible nozzle
Jetavator
Jet vanes
Liquid injection
Auxiliary jets
Direct force control
53
Q

What are the three factors affecting the

choice of a warhead?

A
  • Role
  • Target
  • Accuracy of the missile
54
Q

What are the 3 categories of warheads used in

GW?

A
  • HE
  • Special
  • Non operational
55
Q

List 5 types of HE warhead that are employed in

GW systems?

A
  • HESH
  • frag
  • shaped charge
  • sub projectile
  • blast
56
Q

What are the 3 types of Special Warheads?

A
  • chemical
  • biological
  • nuclear
57
Q

What is meant by the term “Propagation”?

XX

A

Manner in which the effect of a warhead is transmitted eg blast, fragments etc

58
Q

The Safety & Arming Mechanism has three
functions what are they ?

XX

A
  • Prevent accidental initiation of warhead
  • Arm the warhead after firing when missile is a safe distance from operator
  • Translate the fuze firing signal into a detonation wave
59
Q

Examples of Electrical Aux. power? (5)

A
  • generators / alternators
  • accumulators
  • thermal batteries
  • mercury cells
  • dry batteries
60
Q

The payload and fuzing system of GW are usually referred to as the armament system, what are its basic components?

A
  • Payload
  • Fuze
  • Safety and Arming Mechanism
61
Q

What are the non-operational heads for use on GW?

A
  • Drill
  • Practice
  • Telemetry
62
Q

What are the three types of fuzes for use on GW?

A
  • Impact
  • Time
  • Proximity
63
Q

What is attenuation?

A

Reduction in effect of the warhead as distance from detonation increases

64
Q

What are 2 types of controlled guidance?

Expand with 2 subtypes for the first

A

Command

  • Command (to) Line of Sight - CLOS
  • Command Off the Line Of Sight - COLOS
65
Q

4 assemblies to a bi-propellant engine?

A
  • Storage tanks
  • engine
  • feed system
  • fuel control system
66
Q

Advantages to solid propellants (6)

A
  • immediate response when firing
  • storage container for propellant
  • Ease of storage and handling
  • simple design
  • Can be a stress bearing member
  • Non Toxic
67
Q

Advantage of turbojet?

A

NO BOOST required to get engine to operating speeds

68
Q

What does SACLOS stand for?

A

Semi automatic Command to Line of Sight

AmmoTech (41 decks)

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