Vibration Sources and Uses Flashcards
What is the Most Common Cause of Vibration?
a) Forces
b) Looseness
c) Static Electricity
d) Misalignment
a) Forces
In which of these machines would vibration be a helpful and why?
a) Surface Grinder
b) Wind Turbine
c) Boiler Feed Pump
d) Shaker Screen
d) Shaker Screen
The purpose of a Shaker Screen is to “Shake”. This is needed.
In which of these machines would vibration be a source of Poor Quality?
a) Shaker Screen
b) Surface Grinder
c) Paint Mixer
d) Vibratory Conveyer
b) Surface Grinder
Which of the following is NOT a destructive effect of Vibration?
a) Rolling element bearing Failure
b) Rubs in fluid film bearings.
c) Stress Relieving
d) Broken or cracked piping and air ducts.
c) Stress Relieving
Vibrations result from _______ on the machine that are _________ or __________ generated. Therefore, vibrations is a symptom of some ______________ or ____________.
Vibrations result from forces on the machine that are internally or externally generated. Therefore, vibrations is a symptom of some machine function or condition.
Vibration is associated with trouble in machines, such as:
Wear
Malfunction
Noise
Structural Damage
The two caused of vibration are:
-Forces(internal or external)
-Internal is referred to as imposed motion
What are the five common types of vibration and which is the most common?
Harmonic
Pulsating
Periodic(Most Common)
Impulsive
Random
Periodic Vibration relates to common machine faults at operating speed such as:
Mass Unbalance
Misalignment
Impulsive Vibration relates to:
Bearing Roller element faults
Gear Tooth Faults
Pulsating Vibrations is caused by _________, which relates to:
Beating
Addition of Vibration from two machines nearby, in which the amplitude vibration changes periodically with time.
Random Vibrations is related to:
Flow Problems: for example, cavitation.
What does the electronic data collector do?
Acquire, store, and analyze data.
The vibration sensor, also referred to as a ___________, does what?
Transducer
Converts Mechanical Vibration into an Electric signal which is time varying voltage
The voltage level indicator is used to indicate
Severity of Vibration
The trigger sensor is used for:
Balancing and detailed analysis; it also provides a reference of machine speed.
What’s is the graph below showing?
Raw Vibration Velocity Data over a specified time span. It also, shows the peaks value.
