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1 2002

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Active Damping of Stick-Slip Self-Excited Vibration for Selected External Excitation Frequencies

Ryczek B., Bogacz R.

Machine Dynamics Problems

2002

Vol. 26, No. 1

35-42

There are numerous possibilities of active control of vibration in mechanical systems. Nevertheless, a very limited number of them can be applied to self-excited systems. This paper presents mechanisms for the generation of stick-slip self-excited vibration of the system with a relatively complicated, history dependent friction mode. The system is additionally influenced by an external harmonic excitation. The experimentally identified friction model enables the description of various cases of stationary and transient motion. For the majority of parameters the values of the external excitation, the amplitude of the system motion is greater than without it. But according to the theory, for the particular frequency of the external excitation, it is possible to minimise the amplitude more than twice. A discussion on the appropriate choice of excitation frequency is given in the paper.