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Motion in Waves > Waves > Flashcards

Waves Flashcards

1
Q

High Frequency, Short Wave

A

Ripple

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2
Q

Distance to complete one complete wave (sine) cycle, defined as 2π radians

A

Period T

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3
Q

Low frequency, long wave and high frequency waves dissipated

A

Swell

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4
Q

Stable wave with maximized wave height and energy

A

Fully developed wave

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5
Q

A wave pattern in the typical sine pattern

A

Sinusoidal Waves

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6
Q

1 second =

A

9.43 radians

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7
Q

If spring is compressed or placed in tension, force that will try to return to its original location is

A

Restoring Forve

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8
Q

The number of radians completed in 1 second

A

Frequency

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9
Q

π =
2π =

A

180 deg, 360 deg/ 1 complete cycle

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10
Q

The magnitude of the restoring force is proportional to the magnitude of the displacement

A

Linear Force

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11
Q

The distance travelled at a given time T

A

Displacement (Z)

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12
Q

Exiting force or waves

A

Motion Source

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13
Q

Radiated Wave, eddy and viscous force

A

Damping Source

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14
Q

Unless energy is continually added, the system will eventually come at rest

A

Force function and Resonance

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15
Q

When the force function is applied at the same frequency as the oscillating system, a condition of — exists

A

Resonance

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16
Q

Condition 1: the frequency of the forcing function is much smaller than the system

A

Z=F/k

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17
Q

Condition 2: The frequency of the force function is much greater than the system

A

Z=0

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18
Q

Condition 3: The frequency of the forcing function equals the system

A

z = Infinity (Resonance)

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19
Q

Translational Motion

A

Surge, Sway, Heave

20
Q

Simple Harmonic Motion

A

Heave Pitch and Roll

20
Q

Rotational Motion

A

Roll, Pitch, Yaw

21
Q

Stiff Ship, small period; bad seakeeping quality

A

Large GM

22
Q

Tender Ship, less stable; good seakeeping quality

A

Small GM

23
Q

Encounter Frequency = Natural Frequency

A

Resonance

24
Q

Are well Damped due to large wave generation

A

Heave and Pitch

25
Q

Susceptible to encounter frequency and —- are not damped well due to small damping

A

Roll Amplitude, roll motions

25
Q

Caused by relative motion of ship and sea

A

Non-Oscillatory Dynamic Response

26
Q

More likely to occur with roll than pitch and heave

A

Resonance

27
Q

opposite case of shipping water where the bow of the ship is left unsupported

A

Forefoot Emergence

27
Q

Caused by bow submergence

A

Shipping Water

28
Q

Impact of the bow region when bow reenters into the sea. Causing severe structural Vibration

A

Slamming

29
Q

The stern version of forefoot emergence

A

Racing

30
Q

cause the propeller to leave the water and thus cause the whole ship power to race

A

severe torsion and wear in shaft

31
Q

The effects of all these response is to increase the resistance

A

Added Power

32
Q

limits Awl and TPI reducing heave acceleration

A

Volume is distributed higher

32
Q

Limits MT1 reducing pitch acceleration

A

forward and aft are V-shaped

33
Q

Very common passive anti rolling device
Located at the bilge turn
Reduce roll amplitude up to 35%

A

Bilge Keel

33
Q

limits the Ixx reducing the stiffness of GZ curve thereby reducing roll acceleration

A

Wider water plane forward

34
Q

Reduce the roll motion by throttling the fluid in the tank
relative change of G of fluid will dampen the roll

A

Tank Stabilizer

35
Q

Very Common active anti-rolling device
Located at the Bilge Keel
Controls the roll by creating lifting force

A

Fin Stabilizer

36
Q

A ship heading directly into the waves will meet the successive waves much more quickly and the waves will appear to be a much shorter period

A

Head Sea

37
Q

A ship moving in a following sea, the waves will appear to have a longer period

A

Following Sea

38
Q

If wave approaches a moving ship from the broadside there will be no difference between wave period and apparent period experienced by the ship

A

Beam Sea

39
Q
A
40
Q

Are periodic, uniform waves with a consistent wavelength and amplitude

They repeat at regular intervals, making them idealized representations of wave motion

A

Regular Waves

41
Q

are more common in nature and represents complex combination of different wave frequencies, amplitudes and directions. They vary significantly over time.

A

Irregular Waves

Motion in Waves (3 decks)

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