Effects of Anomalous Rotor Joints on Turbomachine Dynamics

Klompas, N.

doi:10.1115/83-gt-175

Cited by 2 publications

(1 citation statement)

References 6 publications

(7 reference statements)

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“…Despite the strict control of preloads, the joint components may experience relative displacements at joint interfaces under severe loading conditions, such as large imbalance forces due to loss of a fan blade. 1,2 The relative displacements of joint components might cause local nonlinearity and result in complex dynamic behavior of rotor systems.…”

Section: Introductionmentioning

confidence: 99%

Analytical model of bolted disk–drum joints and its application to dynamic analysis of jointed rotor

Qin

Han

Chu

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

126

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Bolted joints are widely used in aero-engines. One of the common applications is to connect the rotor disks and drums. An analytical model for the bending stiffness of the bolted disk-drum joints is developed. The joint stiffness calculated using the analytical model shows sound agreement with the calculation obtained based on finite element analyses. The joint stiffness model is then implemented into the dynamic model of a simple rotor connected through the bolted diskdrum joint. Finally, the whirling characteristics and steady-state response of the jointed rotor are investigated to evaluate the influence of the joint on the rotor dynamics, where the harmonic balance method is employed to calculate the steady-state response to unbalance force. The simulation results show that the joint influence on the whirling characteristics of the rotor system can be neglected; whereas, the presence of the bolted disk-drum joint may lead to a decrease in the rotor critical speeds due to the softening of the joint stiffness. The proposed analytical model for the bolted disk-drum joints can be adopted conveniently for different types of rotor systems connected by bolted disk-drum joints.

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Section: Introductionmentioning

confidence: 99%

Analytical model of bolted disk–drum joints and its application to dynamic analysis of jointed rotor

Qin

Han

Chu

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

126

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Active crack control approach applied to a horizontal rotating machine

Leão

Pereira

Carvalho

et al. 2022

Journal of Vibration and Control

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The present contribution proposes an active vibration control technique devoted to shafts with cracks aiming to minimize their propagation. The existence of a crack in rotating shafts can be characterized by 2 X and 3 X super-harmonic amplitudes in the vibration responses of the rotor, which can increase as the crack propagates along the shaft’s cross-section. A proportional-integral-derivative control technique is applied to suppress the 2 X and 3 X vibration amplitudes of a cracked shaft, which is performed by using a bandpass filter applied to the vibration responses of the rotor. Numerical and experimental results are obtained through both a representative finite element model of a horizontal rotor and its corresponding test-rig. In this case, electromagnetic actuators are used to apply the control effort to the rotor. The Mayes model is applied for simulating the breathing behavior of the transverse crack. The linear fracture mechanics theory is considered to correlate the crack depth with the corresponding additional rotor flexibility. Both numerical and experimental results demonstrate the possibility of reducing the effects of a transverse crack through active control on the dynamic behavior of a rotating machine. Moreover, it is shown that the proposed control law is capable of controlling the crack effects with the rotor operating in different rotation speeds.

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Effects of Anomalous Rotor Joints on Turbomachine Dynamics

Cited by 2 publications

References 6 publications

Analytical model of bolted disk–drum joints and its application to dynamic analysis of jointed rotor

Analytical model of bolted disk–drum joints and its application to dynamic analysis of jointed rotor

Active crack control approach applied to a horizontal rotating machine

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