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Abstract

This paper describes an experimental apparatus that demonstrates some examples of self-excited vibrations in fluid mechanics. Such vibrations become unstable without an external perturbation but are characterized by an initially stable system with steady flow. The system extracts from the flow and exhibits increasing amplitude of vibration. Two experiments are described, one dependent on area change in ducted flow and the other dependent on the change in flow direction in a double pendulum. Mathematical analyses are developed which establish the stability criteria for the self-excitation observed.

Keywords

self-excited vibration instability stability double pendulum flow induced

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References

Dimarogonas

, Vibration for Engineers (Prentice-Hall, Upper Saddle River, NJ, 1996).

Thompson

Dahleh

, Theory of Vibrations with Applications, 5th edn (Prentice-Hall, Upper Saddle River, NJ, 1998).

Streeter

, Fluid Mechanics, 5th edn (McGraw-Hill, New York, 1971), p. 296.

Meirovitch

, Fundamentals of Vibrations (McGraw-Hill, New York, 2001), pp. 57–60.

Inman

, Engineering Vibration, 2nd edn (Prentice-Hall, Upper Saddle River, NJ, 2001).

Timoshenko

, Vibration Problems in Engineering, 3rd edn (D. Van Nostrand, Princeton, NJ, 1955), pp. 196–199.

Apparatus for Demonstrating Self-Excited Vibrations in Fluid Flow

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