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The problem of active vibration control of weakly damped mechanical structures is potentially unstable modes of vibrations due to the positive feedback for some vibration modes. The paper will discuss the change of positive feedback on the negative one using all-pass discrete-time filters which are arranged in a cascade. The piezoelectric actuator as a source of force is used to damp vibration. It...
Two dimensional Fourier transform is a powerful tool for image processing, especially in the field of image restoration and filtration. But also it is useful for detection of periodicities at any angle with respect to the image edge. This paper describes the use of two dimensional Fourier transform in the MATLAB environment to compute the length of a wave and the angle between the line that connects...
This paper deals with a system for active rotor's vibration control. A test stand Rotor-kit for testing of the effect of rotors instability has been assembled. This system enables to control journal bearings for suppressing instability caused by an oil film actively. As actuators the piezoactuators have been used. The system of Rotor-kit has been designed in order to test different types of shafts...
Rotor instability is one of the most serious problems of high-speed rotors supported by sliding bearings. With constantly increasing parameters, new machines problems with rotor instability are encountered more and more often. Even though there are many solutions based on passive improvement of the bearing geometry to enlarge the operational speed range of the journal bearing, the paper deals with...
Piezoactuators become a perspective component for micromechanics and active vibration control. The piezoactuator as a microdrive operates on the principle of the reverse piezoelectric effect. Mechanical properties of the piezoactuators are as follows: high frequency range of operation, small travel range and large applied force. This paper deals with the simulation model of the piezoactuators..
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