Analytical modeling of asymmetric multi-segment rotor – bearing systems with Timoshenko beam model including gyroscopic moments

Identification of bearing dynamics under operational conditions for chatter stability prediction in high speed machining operations

“…In this paper, using the recalculated tool point FRFs under cutting conditions [28] and employing the mathematical model suggested [29], bearing stiffness and damping under operational conditions are identified. It is shown that, bearing parameters are affected both by spindle rotational speed and cutting forces.…”

“…In determining tool point FRF theoretically, the receptance coupling approach proposed in previous studies [12,13] is combined with a recent method developed by Orkun et al [29]. In this study, spindle-holder-tool assembly is divided into subcomponents (spindle, holder and tool) and each subcomponent is modeled using Timoshenko beam model including gyroscopic moments.…”

“…Spindle-holder-tool assembly is also modeled for the idle state using the modeling procedures proposed in earlier studies [12,13,29]. Note that in order to obtain tool point FRF theoretically, bearing and interface parameters must be known.…”

Dynamics of Structures with Distributed Gyroscopes: Modal Discretization Versus Spatial Discretization

“…Although gyroscopic continua such as axially moving materials [24] and rotating components [25] have been studied widely, structures with discrete rotors have received less attention. In this study, we propose a spatial discretization technique designed to tackle flexible structures with distributed gyroscopes.…”

Reduced-order modeling for rotating rotor-bearing systems with cracked impellers using three-dimensional finite element models

“…The first approach -the rotordynamic approach deals with shaft-bearing systems with simplified disc models. Two frequently used methods for vibration analysis of rotor-bearing systems are the Jeffcott rotor model [1][2][3][4] and beam model [5][6][7][8][9][10], which have been widely used to study the nonlinear vibrations and stability analysis for cracked rotors and rotors with other types of nonlinearities [11][12][13]. The Jeffcott rotor is the simplest lumped parameter model.…”