...Ali Asghar Jafari; Reza Kazemi; Mohammad Faraji Mahyari The main goal of this research is to analyze the effects of drilling mud flow rate, drill string weight, weight on bit and angular velocity on stability and vibration of a drill string. To this end, kinetic and potential energies of a rotating...

... in the rotor dynamic modeling. combi-bearing vertical rotor natural frequency natural mode coupled motions angular velocity elastic constants hydrodynamics machine bearings rotors shafts structural acoustics turbogenerators vibrations 2011 American Society of Mechanical...

... are derived in detail using the extended Hamilton principle. It has been shown that the source of coupling in the equations of motion is the rotation and that the equations are linked through the angular velocity of the base. Since the beam-tip-mass system at hand serves as the building block of many...