19 Vibration Damping Clarence W. de Silva

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The University of British Columbia

19.1 Introduction ...................................................................... 19-1

19.2 Types of Damping ............................................................. 19-2

Material (Internal) Damping † Structural Damping †

Fluid Damping

19.3 Representation of Damping in Vibration Analysis ........ 19-9

Equivalent Viscous Damping † Complex

Stiffness † Loss Factor

19.4 Measurement of Damping ............................................... 19-16

Logarithmic Decrement Method † Step – Response

Method † Hysteresis Loop Method † Magnification

Factor Method † Bandwidth Method † General

Remarks

19.5 Interface Damping ............................................................ 19-26

Friction in Rotational Interfaces † Instability

Summary

Damping in vibrating systems occurs through the dissipation of mechanical energy. This chapter presents modeling,

analysis, and measurement of mechanical damping. The types of damping covered include material internal

damping (including viscoelastic damping and hysteretic damping), structural damping, fluid damping, interface

damping, viscous damping, Coulomb friction, and Sribeck damping. Representations of various types of damping

using equivalent viscous damping models are analyzed. Damping in rotating devices is also studied.

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