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Piezoelectric Stabilisation of Leipholz Columns

Kurnik W.

Machine Dynamics Problems

2000

Vol. 24, No. 1

121-129

The paper is concerned with a concept of flutter suppression in slender columns subjected to tangential follower forces. The mechanism of self-excitation of such systems is more or less recognised what enables a designer to apply proper stabilisation methods including active techniques. Promissing results have been obtained in numerical experiments with distributed piezoelectric actuators contracting column curvature occurring as a disturbance of the strait-line equilibrium position. Piezoelements can also be used in what is called shunting effect to additionally dissipate energy of transverse vibration. The method has been successfully applied in reduction of resonat vibrations of transversely loaded beams and plates. In the present paper the shunting effect is modelled and examined from the point of view of application in a non-conservative self-excited system being the Leipholz column.