Vibration Testing

Question 1

What is the Ski Slope Effect?

Answer 1

The initial Data is distorted and slopes down to actual vibration readings

Question 2

What are the Central Tasks of Periodic Monitoring?

Answer 2

Screening and Trending

Screening is the prociss of sampling and comparing data to alarms to determine the condition

Trending - Comparing Data to Previous trends

Question 3

When Trending overall Amplitude values of vibration does not work, the problem is?

Answer 3

lack of signal strength
noise problems
Amplitudes are Masked

Question 4

What change would indicate the need to do a more detailed analysis, more frequent monitoring, or shut down?

Answer 4

2-2.5x

Question 5

How to fix data that’s overpowered by higher Amplitudes?

Answer 5

RMS trending of band filtered values

Question 6

What is Band Filtered Values?

Answer 6

Elimination of higher amplitudes/Normal vibration levels that overpower the Lower Frequencies that we need to see.

Similar to opening a dirty window for a closer/clearer view

Question 7

How many Alarms are there usually?

What are they?

Answer 7

2-3 Alarms

Alert
Warning
Fault

Question 8

What is Fault Analysis

Answer 8

The process of finding what the problem is and where it is located.

Question 9

The analyst obtains an overview of the fault and severity by looking at the

Answer 9

Periodicity
Shape
Amplitude

of the Time Wave From

Question 10

What is Condition Analysis?

Answer 10

Process of determining the severity of the vibration and what it means

Question 11

What is Resonance?

Answer 11

When natural frequencies = forcing frequencies. Most machines cannot tolerate this.