D
datakoll
Guest
FORD TRUCK SHOP MANUAL:
Glossary of Terms
Amplitude
The quantity or amount of energy produced by a vibrating component (G-
force). An extreme vibration has a high amplitude. A mild vibration
has a low amplitude. See Intensity.
Boom
Low frequency or low pitched noise often accompanied by a vibration.
Also refer to Drumming.
Buffet/Buffeting
Strong noise fluctuations caused by gusting winds. An example would be
wind gusts against the side glass.
Buzz
A low-pitched sound like that from a bee. Often a metallic or hard
plastic humming sound. Also describes a high frequency vibration.
Vibration feels similar to an electric razor.
Chatter
A pronounced series of rapidly repeating rattling or clicking sounds.
Chirp
A short-duration high-pitched noise associated with a slipping drive
belt.
Chuckle
A repetitious low-pitched sound. A loud chuckle is usually described
as a knock.
Click
A sharp, brief, non-resonant sound, similar to actuating a ball point
pen.
Clonk
A hydraulic knocking sound. Sound occurs with air pockets in a
hydraulic system. Also described as hammering.
Clunk/Driveline Clunk
A heavy or dull, short-duration, low-frequency sound. Occurs mostly on
a vehicle that is accelerating or decelerating abruptly. Also
described as a thunk.
Conductor
The components that carry (transmit) a vibration frequency from the
originator to the reactor.
Cycles Per Second (CPS)
Cycles per second. Same as hertz (Hz).
Cracks
A mid-frequency sound, related to squeak. Sound varies with
temperature conditions.
Creak
A metallic squeak.
Cycle
The process of a vibrating component going through a complete range of
motion and returning to the starting point.
Decibel (dB)
A unit of measurement, referring to sound pressure level, abbreviated
dB.
Drone
A low frequency steady sound, like a freezer compressor. Also
described as a moan.
Drumming
A cycling, low-frequency, rhythmic noise often accompanied by a
sensation of pressure on the ear drums. Also described as a low
rumble, boom or rolling thunder.
Flutter
Mid to high intermittent sound due to air flow. Similar to a flag
flapping in the wind.
Frequency
The rate at which a cycle occurs within a given time.
G-force
The additional load or weight produced in an object during
acceleration. When measuring the level or amplitude of a vibration
without sound, the unit G is added to associate the force of the
vibration to gravity. This is similar to measuring the weight of an
object, which is also a function of gravity.
Gravelly Feel
A grinding or growl in a component, similar to the feel experienced
when driving on gravel.
Grind
An abrasive sound, similar to using a grinding wheel, or rubbing sand
paper against wood.
Hertz (Hz)
A frequency measured in cycles per second.
Hiss
Steady high frequency noise. Vacuum leak sound.
Hoot
A steady low frequency tone, sounds like blowing over a long neck
bottle.
Howl
A mid-range frequency noise between drumming and whine. Also described
as a hum.
Hum
Mid-frequency steady sound, like a small fan motor. Also described as
a howl.
Intensity
The physical quality of sound that relates to the strength of the
vibration (measured in decibels). The higher the sound's amplitude,
the higher the intensity and vice versa. See Amplitude.
Knock
A heavy, loud, repetitious sound, like a knock on the door.
Moan
A constant, low-frequency tone. Also described as a hum.
Ping
A short duration, high-frequency sound, which has a slight echo.
Pitch
The physical quality of sound that relates to its frequency. Pitch
increases as frequency increases and vice versa.
Pumping Feel
A slow, pulsing movement.
Rattle
A random and momentary or short duration noise.
Reactor
The component, or part that receives a vibration from an originator
and conductor and reacts to the vibration by moving.
Roughness
A medium-frequency vibration. A slightly higher frequency than a
shake. This type of vibration is usually related to drivetrain
components.
Rustling
Intermittent sound of varying frequency, sounds similar to shuffling
through leaves.
Shake
A low-frequency vibration, usually with visible component movement.
Usually relates to tires, wheels, brake drums or brake discs if it is
vehicle speed sensitive, or engine if it is engine speed sensitive.
Also referred to as a shimmy or wobble.
Shimmy
An abnormal vibration or wobbling, felt as a side-to-side motion of
the steering wheel in the driveshaft rotation. Also described as
waddle.
Shudder
A low-frequency vibration that is felt through the steering wheel or
seat during light brake application.
Slap
A resonance from flat surfaces, such as safety belt webbing or door
trim panels.
Squeak
A high-pitched transient sound, similar to rubbing fingers against a
clean window.
Squeal
A long-duration, high-pitched noise.
Tap
A light, rhythmic or intermittent hammering sound, similar to tapping
a pencil on a table edge.
Thump
A dull beat caused by 2 items striking together.
Tick
A rhythmic tap, similar to a clock noise.
Tip-In Moan
A light moaning noise heard during light vehicle acceleration, usually
between 40-100 km/h (25-65 mph).
Transient
A noise or vibration that is momentary, a short duration.
Vibration
Any motion, shaking or trembling, that can be felt or seen when an
object moves back and forth or up and down.
Whine
A constant, high-pitched noise. Also described as a screech.
Whistle
High-pitched noise with a very narrow frequency band. Examples of
whistle noises are a turbocharger or air flow around an antenna.
Wind Noise
Any noise caused by air movement in, out or around the vehicle.
Glossary of Terms
Amplitude
The quantity or amount of energy produced by a vibrating component (G-
force). An extreme vibration has a high amplitude. A mild vibration
has a low amplitude. See Intensity.
Boom
Low frequency or low pitched noise often accompanied by a vibration.
Also refer to Drumming.
Buffet/Buffeting
Strong noise fluctuations caused by gusting winds. An example would be
wind gusts against the side glass.
Buzz
A low-pitched sound like that from a bee. Often a metallic or hard
plastic humming sound. Also describes a high frequency vibration.
Vibration feels similar to an electric razor.
Chatter
A pronounced series of rapidly repeating rattling or clicking sounds.
Chirp
A short-duration high-pitched noise associated with a slipping drive
belt.
Chuckle
A repetitious low-pitched sound. A loud chuckle is usually described
as a knock.
Click
A sharp, brief, non-resonant sound, similar to actuating a ball point
pen.
Clonk
A hydraulic knocking sound. Sound occurs with air pockets in a
hydraulic system. Also described as hammering.
Clunk/Driveline Clunk
A heavy or dull, short-duration, low-frequency sound. Occurs mostly on
a vehicle that is accelerating or decelerating abruptly. Also
described as a thunk.
Conductor
The components that carry (transmit) a vibration frequency from the
originator to the reactor.
Cycles Per Second (CPS)
Cycles per second. Same as hertz (Hz).
Cracks
A mid-frequency sound, related to squeak. Sound varies with
temperature conditions.
Creak
A metallic squeak.
Cycle
The process of a vibrating component going through a complete range of
motion and returning to the starting point.
Decibel (dB)
A unit of measurement, referring to sound pressure level, abbreviated
dB.
Drone
A low frequency steady sound, like a freezer compressor. Also
described as a moan.
Drumming
A cycling, low-frequency, rhythmic noise often accompanied by a
sensation of pressure on the ear drums. Also described as a low
rumble, boom or rolling thunder.
Flutter
Mid to high intermittent sound due to air flow. Similar to a flag
flapping in the wind.
Frequency
The rate at which a cycle occurs within a given time.
G-force
The additional load or weight produced in an object during
acceleration. When measuring the level or amplitude of a vibration
without sound, the unit G is added to associate the force of the
vibration to gravity. This is similar to measuring the weight of an
object, which is also a function of gravity.
Gravelly Feel
A grinding or growl in a component, similar to the feel experienced
when driving on gravel.
Grind
An abrasive sound, similar to using a grinding wheel, or rubbing sand
paper against wood.
Hertz (Hz)
A frequency measured in cycles per second.
Hiss
Steady high frequency noise. Vacuum leak sound.
Hoot
A steady low frequency tone, sounds like blowing over a long neck
bottle.
Howl
A mid-range frequency noise between drumming and whine. Also described
as a hum.
Hum
Mid-frequency steady sound, like a small fan motor. Also described as
a howl.
Intensity
The physical quality of sound that relates to the strength of the
vibration (measured in decibels). The higher the sound's amplitude,
the higher the intensity and vice versa. See Amplitude.
Knock
A heavy, loud, repetitious sound, like a knock on the door.
Moan
A constant, low-frequency tone. Also described as a hum.
Ping
A short duration, high-frequency sound, which has a slight echo.
Pitch
The physical quality of sound that relates to its frequency. Pitch
increases as frequency increases and vice versa.
Pumping Feel
A slow, pulsing movement.
Rattle
A random and momentary or short duration noise.
Reactor
The component, or part that receives a vibration from an originator
and conductor and reacts to the vibration by moving.
Roughness
A medium-frequency vibration. A slightly higher frequency than a
shake. This type of vibration is usually related to drivetrain
components.
Rustling
Intermittent sound of varying frequency, sounds similar to shuffling
through leaves.
Shake
A low-frequency vibration, usually with visible component movement.
Usually relates to tires, wheels, brake drums or brake discs if it is
vehicle speed sensitive, or engine if it is engine speed sensitive.
Also referred to as a shimmy or wobble.
Shimmy
An abnormal vibration or wobbling, felt as a side-to-side motion of
the steering wheel in the driveshaft rotation. Also described as
waddle.
Shudder
A low-frequency vibration that is felt through the steering wheel or
seat during light brake application.
Slap
A resonance from flat surfaces, such as safety belt webbing or door
trim panels.
Squeak
A high-pitched transient sound, similar to rubbing fingers against a
clean window.
Squeal
A long-duration, high-pitched noise.
Tap
A light, rhythmic or intermittent hammering sound, similar to tapping
a pencil on a table edge.
Thump
A dull beat caused by 2 items striking together.
Tick
A rhythmic tap, similar to a clock noise.
Tip-In Moan
A light moaning noise heard during light vehicle acceleration, usually
between 40-100 km/h (25-65 mph).
Transient
A noise or vibration that is momentary, a short duration.
Vibration
Any motion, shaking or trembling, that can be felt or seen when an
object moves back and forth or up and down.
Whine
A constant, high-pitched noise. Also described as a screech.
Whistle
High-pitched noise with a very narrow frequency band. Examples of
whistle noises are a turbocharger or air flow around an antenna.
Wind Noise
Any noise caused by air movement in, out or around the vehicle.
