Investigation of effective parameters on critical speed of the rotating shaft

In various industrial applications there is a need for higher speed. Critical speed and resonance are phenomena which play a major role in many machines and systems. Particularly in the case of rotating shafts and rotors, impermissibly high oscillation amplitudes occur at certain speeds which may even result in the destruction of the machine under certain conditions. In this paper, we will investigate the vibrations of a whirling shaft. For this purpose, we consider a thin elastic shaft with a concentrated mass and we will obtain its critical speeds by analytical and experimental methods. Also we will investigate the effects of different lengths on the shaft vibrations. Finally, we will do a comparison between experimental, analytical, finite element methods and a discussion would conducted. Then by FEM, we will analyze the desired shaft system with concept of Campbell diagram

Keywords:

Natural frequency , Campbell diagram , finite element