15 Vibration Instrumentation Clarence W. de Silva

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The University of British Columbia

15.1 Introduction ........................................................................ 15-1

15.2 Vibration Exciters ............................................................... 15-3

Shaker Selection † Dynamics of Electromagnetic Shakers

15.3 Control System ................................................................... 15-15

Components of a Shaker Controller † Signal-Generating

Equipment

15.4 Performance Specification ................................................. 15-21

Parameters for Performance Specification † Linearity †

Instrument Ratings † Accuracy and Precision

15.5 Motion Sensors and Transducers ...................................... 15-27

Potentiometer † Variable-Inductance Transducers †

Mutual-Induction Proximity Sensor † Selfinduction

Transducers † Permanent-Magnet Transducers †

Alternating Current Permanent-Magnet Tachometer †

Alternating Current Induction Tachometer † Eddy Current

Transducers † Variable-Capacitance Transducers †

Piezoelectric Transducers

15.6 Torque, Force, and Other Sensors .................................... 15-50

Strain Gage Sensors † Miscellaneous Sensors

Appendix 15A Virtual Instrumentation for Data

Acquisition, Analysis, and Presentation ........................... 15-73

Summary

Devices useful in instrumenting a mechanical vibrating system are presented in this chapter. Shakers, which

generate vibration excitations, are discussed and compared. A variety of sensors, including motion sensors,

proximity sensors, force/torque sensors, and other miscellaneous sensors, are considered. Performance specification

in the time domain and the frequency domain is addressed. Rating parameters of instruments are given.

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