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ISTAR Foundation > Acoustics > Flashcards

Acoustics Flashcards

1
Q

What does SS K stand for?

A

Submersible ship killer - Hunter killer submarine conventionally powered

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2
Q

What does SSC stand for?

A

Submersible ship coastal - conventionally powered

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3
Q

What does SSP stand for?

A

Submersible ship air independent propulsion

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4
Q

What does SSN stand for?

A

Submersible ship nuclear

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5
Q

What does SSAN stand for?

A

Submersible ship auxiliary nuclear

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6
Q

What does SSBN stand for?

A

Submersible ship ballistic missile nuclear

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7
Q

What does SSGN stand for?

A

Submersible ship guided missile nuclear

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8
Q

Name the advantages/ disadvantages of a nuclear submarine?

A

They offer advantages of range, speed, and endurance.

The disadvantage is the requirement to constantly be running the nuclear reactor causing noise

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9
Q

Name advantages and disadvantages of a diesel submarine?

A

Diesel submarine in battery mode is quieter than a nuclear powered submarine
Limited endurance is a disadvantage and submarine has to surface for air known as snorting

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10
Q

There are 7 propulsion modes, names them?

A 
Turbo Reduction 
Turbo Electric
Diesel direct
Diesel reduction
Diesel Electric 
Battery drive
Air independent propulsion
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11
Q

Name 6 components on the Turbo Reduction engine (nuclear)

A 
Pressuriser
Reactor
Main coolant pump 
Steam generator 
Turbo generator 
Motor generator
Main turbine
Electrical propulsion motor
Main condenser
Battery
Reduction gearing
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12
Q

What is the definition of sound?

A

Sound is defined as a periodic variation of pressure, particle displacement or particle velocity in an elastic medium

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13
Q

How does temperature, depth and salinity effect AV acoustic velocity

A

1 degree Celsius increase in temperature increased AV by 3m/s

100 m in depth increases AV by 2M/S

1 part per thousand increase in salinity increases AV by 1.1m/s

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14
Q

What does HALT stand for?

A

High away low towards

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15
Q

Name the three layers of the ocean model?

A

Mixed Layer

Thermocline

Deep water

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16
Q

What is the definition of ambient noise?

A

Ambient noise is defined as any noise within the ocean is not target related

17
Q

What are the two categories of background noise?

A

Natural noises

Man made noise

18
Q

Natural noise can be further divided as follows into four categories, what are they?

A

Biological
Ice
Weather
Seismic

19
Q

Man made noise can be further divided as follows into what four categories?

A

Shipping noise
Seismic surveying
Drilling
Active transmissions (military or civilian)

20
Q

What is the definition of a chokepoint name three examples?

A

Chokepoints are geographical features, above or below the surface of the sea, they restrict the freedom of movement of a submarine.
The English Channel
The straits of Gibraltar
Greenland-Iceland-UK Gaps

21
Q

Describe the ocean bottom topography?

A 
Continental shelf - shallows
Continental slope - abrupt drop
Continental rise - change to angle 
Ocean trench - deep area
Seamounts (jagged or flat top)
Abyssal plain - bottom of sea flat 
Mid-Atlantic ridge
22
Q

What are the three main requirements of an acoustic detection system?

A

Good penetration (active) or sensitively (passive)
High resolution
High data rate

23
Q

Name the elements of an airborne acoustic detection system?

A

1st Detection
Detection - amplification - demodulation

2nd Processing
Fourier Analysis

3rd Display
Display ADU - Headset audio

24
Q

A low-fat gram comprises of 3 dimensions and you can process a 4th, what are they?

A

Time, frequency, and intensity.

Colour (bearing)

25
Q

What is the definition of Doppler?

A

Doppler is the apparent change in frequency due to relative motion between a source and a receiver

26
Q

What does DSCPA stand for?

A

Doppler shift closest point of approach

27
Q

What are the six pieces of information that can be gained from a CPA - closest point approach

A 
Speed
Range
Bearing
Track
F0
Depth
28
Q

What is the formulae for calculating speed from CPA

A

Speed = 1450 x (Fmax-Fmin) divided by F0

F0 = Fmax + Fmin divided by 2

29
Q 
What do the following acronyms stand for?
EFR
Cyl
CFR
S/C
CSR
ERPM
R:R
SRPM
SR
BR
A 
Engine firing rate
Cylinders
Cylinder firing rate
Stroke cycle 
Cylinder shaft rate
Engine RPM
Reduction ratio
Shaft RPM
Shaft rate
Blade rate
30
Q 
What are the main operating statics for the SSQ-53F DIFAR 
Size
Depth & drop time
Battery life
Channels
A 
Size A 
Depth 90ft = 40 seconds
200ft = 65 seconds
400ft = 100 seconds
1000ft = 180 seconds 
Battery life 
0.5, 1, 2, 4, and 8 hours 
Channels 1-99 except 57, 58 and 93
31
Q

What does DIFAR stand for? And what is it’s use?

A

Directional frequency analysis and recording.

They are the primary passive buoy in use in the UK and their allies

32
Q

The SSQ53G is similar to the SSQ53F, except for what feature?

A

It’s has a GPS capability

33
Q 
What are the main operating statics for the SSQ-36B Bathy 
Size
Depth & drop time
Battery life
Channels
A

Size A
Depth 2625ft and 5ft per second
Battery life 12 minutes
Channels 1-99

34
Q 
What are the main operating statics for the SSQ-62D/E DICASS
Size
Depth
Operating life
Channels
A 
Size A 
Depth shallow 50ft, 150ft and 300ft
            Deep 90ft, 400ft and 1500ft
Operating life 50 ping seconds or 60 mins 
Channels 
1-99 except 57,58, and 93
A- 6.5khz
B- 7.5khz
C- 8.5khz
D- 9.5khz
35
Q

What does DICASS stand for?

And what does it do?

A

Directional command activated sonobuoy system

The primary active sonobuoy in use they’re able to detect and localise a Submarine

36
Q 
What are the main operating statics for the SSQ-125 MAC
Size
Depth
Battery life
Channels
A

Size A
Depth 65ft, 175ft, 300ft and 500ft
Battery life 8 hours or 140 ping seconds
Channel 96

37
Q

What does MAC stand for?

A

Multi static active coherent

ISTAR Foundation (3 decks)

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