Vibration Suppression of Rotating Shafts Passing Through Resonances by Switching Shaft Stiffness

Wauer, Jörg; Suherman, Surjani

doi:10.1115/1.2893801

Cited by 25 publications

(11 citation statements)

References 27 publications

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“…The possibility of a controlled passage through resonance in dynamic systems with an ideal energy source is investigated in the book by Chernousko et al [18] and the papers by Nagaya et al [19], and Wauer [20], in which the control of the vibrations is realized by switching the elastic components of the suspension structure. In references [20,21] and Dimentberg et al in references [22,23] examine a controllable passage in a system with an s.d.o.f. and a non-ideal source of energy.…”

Section: Preliminary Commentsmentioning

confidence: 99%

Remarks on the Passage Through Resonance of a Vibrating System With Two Degrees of Freedom, Excited by a Non-Ideal Energy Source

Balthazar¹,

Cheshankov²,

Ruschev³

et al. 2001

Journal of Sound and Vibration

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Section: Preliminary Commentsmentioning

confidence: 99%

Remarks on the Passage Through Resonance of a Vibrating System With Two Degrees of Freedom, Excited by a Non-Ideal Energy Source

Balthazar¹,

Cheshankov²,

Ruschev³

et al. 2001

Journal of Sound and Vibration

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“…The resonance can serve to enhance the coupling between components and/or vibrational modes, and this coupling can often lead to dramatic, undesirable changes in the performance of the system at hand. One such example occurs when rotordynamic systems are driven through a critical speed [1][2][3]. This passage through resonance is often accompanied by an increase in the vibrational amplitudes of the system and an increase in the power required to maintain a specified acceleration rate.…”

Section: Introductionmentioning

confidence: 98%

Resonant dynamics in a rotordynamic system with nonlinear inertial coupling and shaft anisotropy

Quinn

2009

Nonlinear Dyn

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The response of a nonlinear, damped Jeffcott rotor with anisotropic stiffness is considered in the presence of an imbalance. For sufficiently small external torque or large imbalance, resonance capture or rotordynamic stall can occur, whereby the rotational velocity of the shaft is unable to increase beyond the fundamental resonance between the rotational and translational motion. This phenomena provides a mechanism for energy transfer from the rotational to the translational mode. Using the method of averaging a reduced-order model is developed, valid near the resonance, that describes this resonant behavior. The equilibrium points of these averaged equations, which correspond to stationary solutions of the original equations and rotordynamic stall, are described as the applied torque, damping, and anisotropy vary. As the anisotropy increases, assumed to arise from increasing shaft cracks, the torque required to eliminate the possibility of stall increases. However, when the system is started with zero initial conditions, the minimum torque required to pass through the resonance is approximately constant as the anisotropy increases. The predictions from the reduced-order model are verified against numerical simulations of the original equations of motion.

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“…Unless significant damping is applied the presence of the mode can, however, still be detected. An alternative approach is to use closed-loop control to shift the position of the mode of interest such that it and the frequency of the rotary system do not coincide [4]. The properties of shape memory alloys have made them popular choices for researchers in the field [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Using a pole-placement switching technique to avoid resonance in systems forced by a swept sinewave disturbance

Scott

Weightman

Levesley

2004

Smart Structures and Materials 2004: Smart Structures and Integrated Systems

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Many forced systems are prone to undesirable levels of oscillation if lightly damped modes are present with their frequency range of operation. Rotary systems, for example, can experience these problems during the speed up or speed down stage of operation. Resonant motion can damage or effect the accuracy of operation of such systems and is, therefore, highly undesirable. Many closed-loop controllers avoid this by suppressing the mode itself such that at resonance the modal vibration amplitude is small (i.e. highly damped). The current work presents an alternative novel switching controller, which suppresses the system not by applying a high amount of damping but rather by moving the resonant mode such that it is never excited. From the basis of an accurate plant model, two pole-placement controllers are designed and implemented both in simulation and experiment on a cantilever smart structure. These controllers are shown to successfully change the natural frequency value, while retaining the same damping ratio value. A novel switching system is employed that calculates the optimal switching position by running a simulation of the desired systems in parallel to the controlled open-loop system. Moreover, the system minimises transients occurred by switching back and forth between controllers, thus increasing the efficiency of the system. By comparing the experimental results to a conventional high damping pole-placement controller that applies a similar amount of control effort, a lower overall level of amplitude suppression can be seen.

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Vibration Suppression of Rotating Shafts Passing Through Resonances by Switching Shaft Stiffness

Cited by 25 publications

References 27 publications

Remarks on the Passage Through Resonance of a Vibrating System With Two Degrees of Freedom, Excited by a Non-Ideal Energy Source

Remarks on the Passage Through Resonance of a Vibrating System With Two Degrees of Freedom, Excited by a Non-Ideal Energy Source

Resonant dynamics in a rotordynamic system with nonlinear inertial coupling and shaft anisotropy

Using a pole-placement switching technique to avoid resonance in systems forced by a swept sinewave disturbance

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