DYNAMICS OF FLEXIBLE ROTORS
Final rept., 29 May 1962-28 May 1963
IIT RESEARCH INST CHICAGO IL
Pagination or Media Count:
The determination of the critical speeds of a flexible rotor is usually carried out on the assumptions of negligible bearing mass and stiff ness. In this report the effect of bearing mass and stiffness on the natural frequencies of a uniform flexible shaft is found. Two specific cases are considered the shaft of symmetric cross-section rotating in bearings of different horizontal and vertical stiffness, and the un symmetric shaft rotating in symmetrically stiff bearings. The frequency equations for various types of end constraints are solved by means of a simple graphical procedure. It is found that bearing mass and stiffness usually have considerable influence on all but the first or second critical speeds.
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