Elemento Finito

Introduction Guide to Vibration
Monitoring
Measurements, Analysis, and Terminology
Summary
This guide introduces machinery maintenance workers to condition monitoring analysis
methods used to detect and analyze machine component failures. This guide does not
intend to make the reader an analysis expert. It merely informs the reader about
common analysis methods and lays the foundation forunderstanding machinery
analysis concepts. Moreover, it tells the reader what is needed to perform an actual
analysis on specific machinery.

SKF Reliability Systems
@ptitude Exchange
5271 Viewridge Court
San Diego, CA 92123
United States
tel +1 858 496 3400
fax +1 858 496 3511
email info@aptitudexchange.com
Internet http://www.aptitudexchange.com

Introduction Guide to VibrationMonitoring

JM02001
Jason Mais & Scott Brady
33 Pages
Published May, 2002
Revised

Table of contents

1.

Introduction ........................................................................... 3

1.1.

Detection vs. Analysis .......................................................................... 3

1.2.

Vibration (Amplitude vs. Frequency)...................................................... 3

2.

Overall Vibration or Trending ................................................. 4

2.1.

Frequency Range................................................................................. 4

2.2.

Scale Factors ...................................................................................... 4

2.3.

Measurement Sensor Position............................................................... 5

2.4.

Optimum Measurement Conditions ........................................................ 7

2.5.

Trending Overall Readings .................................................................... 7

3.

Vibration Measurements Methods .......................................... 8

3.1.

Displacement...................................................................................... 9

3.2.

Velocity .............................................................................................10

3.3.

Acceleration .......................................................................................10

3.4.

Time Waveform Analysis .....................................................................11

3.5.

FFTSpectrum Analysis ........................................................................12

3.6.

Envelope or Demodulated Process Detection ..........................................13

3.7.

Phase Measurements ..........................................................................15

3.8.

High Frequency Detection (HFD)...........................................................153.9.

Other Sensor Resonant Technologies ....................................................15

4.

On-line Measurements vs. Off-line Measurements................ 15

5.

International Standards Vibration Diagnostic Tables ........... 16

6.

Spectrum Analysis Table ...................................................... 18

7.Conclusion............................................................................ 21

8.

Further Reading ................................................................... 21

9.

Appendix A: Website links ................................................... 22

9.1.

Instruments .......................................................................................22

9.2.

Sensors.............................................................................................23

10.

Appendix B: Some Vibration Terminology............................. 25

Introduction Guide to Vibration Monitoring

© 2010 SKF Group

2 (33)

1.

Introduction

This guide introduces machinery
maintenance workers to condition
monitoring analysis methods used to detect
and analyze machine component failures.
This...