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Vibration Monitoring and Analysis 171

Vector A quantity that has both magnitude and
direction, and whose components transform
from one coordinate system to another in the
same manner as the components of a dis-
placement.

Velocity The time rate of change of position of a body.
It is a vector quantity with direction as well
as magnitude.
Vibration A continuing periodic change in a displace-
ment with respect to a fixed reference. The
motion will repeat after a certain interval.
Vibration analysis Vibration analysis monitors the noise or
vibrations generated by plant machinery or
systems to determine their actual operating
condition. The normal monitoring range for
vibration analysis is from less than 1 up to
20,000 Hertz.

APPENDIX 7.3 References
Hardenbergh, Donald E. 1963. Introduction to Dynamics. New York: Holt, Rinehart and
Winston.
Higgins, Lindley, and R. Keith Mobley. 1995. Maintenance Engineering Handbook. New York:
McGraw-Hill.
Mobley, R. Keith. 1989. Advanced Diagnostics and Analysis. Knoxville, TN: Technology for
Energy Corp.
Mobley, R. Keith. 1990. Introduction to Predictive Maintenance. New York: Van Nostrand-
Reinhold.
Mobley, R. Keith. 1999. Vibration Fundamentals. Boston: Butterworth–Heinemann.