Vibration Behavior of Rotating Shaft Due to Contact With Casing

Tamura, Kazuhiro; Shiraki, Kazuhiro; Awa, Keizo; Watanabe, Yusuke

doi:10.1299/jsmeintmovic.6.2.1021

Cited by 3 publications

(5 citation statements)

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“…Contact mode solutions are obtained for a series of test cases involving two-degree-of-freedom and multimode rotor systems, which illustrate how the amplitude, phase and stability of the contact mode are related. Analytical predictions are compared with the experimental results of Tamura et al [16] and exhibit the same characteristic orbits and spectral features of the recorded displacement signals. The manner in which the stationary frame rotor response is dependent on the forcing amplitude is also investigated.…”

Section: B B Wmentioning

confidence: 70%

“…To compare the analytical results with those obtained from experiment, the study of Tamura et al [16] is now considered. In this paper, test results were presented for a symmetric rotor with a large centrally mounted disc, surrounded by a resiliently mounted annular casing having a small radial clearance.…”

Section: Correlation With Experimental Resultsmentioning

confidence: 99%

“…The focus of the present study is the fourth type of rotor response, which involves repeated periodic contacts between the rotor and surround where the frequency of contact is not simply a harmonic or subharmonic of the rotational frequency. These types of vibration modes have previously been identi ed through a combination of numerical simulation and experimental testing, including a rotor on bearings with discontinuous stiffness characteristics [15] and a rotor making contact with its casing [16]. In these systems, the bearing characteristics are approximately radially isotropic and the periodic contacts produce a forward or backward 'bouncing' whirl behaviour of the rotor.…”

Section: B B Wmentioning

confidence: 99%

“…In general, the motion of the rotor does not exhibit any periodicity in the stationary frame although the rotor vibration contains components at the synchronous frequency as well as additional components at harmonics of a distinct non-synchronous frequency, previously referred to as spectral 'side-bands' [15]. It is apparent from experimental studies that periodic contact modes can play an important role in the transition of rotor behaviour from stable forward whirl to unstable backward whirl, which can be highly damaging [16,18,19]. Therefore, understanding the factors that determine the fourth type of behaviour is important if the conditions for destructive rotor response are to be avoided.…”

Section: B B Wmentioning

confidence: 99%

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Asynchronous periodic contact modes for rotor vibration within an annular clearance

Cole

Keogh

2003

Proceedings of the Institution of Mechanical Engineers, Part C:

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The dynamics of a multimode rotor-bearing system are analysed when the rotor contacts with a stator having annular clearance. By transforming to a rotating frame, all possible steady state rotor vibration modes that involve periodic contact with the surround may be predicted. Using a harmonic decomposition with generalized fundamental frequency, periodic solutions are obtained for rotor motions that involve asynchronous periodic contact. The analytical solutions are compared with previously published experimental results, which are predicted with considerable accuracy thus confirming the efficacy of the approach. Solutions are obtained for different test cases, which show how the amplitude and stability of the periodic contact modes are dependent on system parameters and operating conditions. In particular, for increased unbalance levels, the amplitude of the contact mode vibration is increased and the response of the rotor progresses from a bouncing forward whirl to a backward whirl-type motion. The nature of the identified rotor responses and implications for machine operation and reliability are discussed.

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Section: B B Wmentioning

confidence: 70%

Section: Correlation With Experimental Resultsmentioning

confidence: 99%

Section: B B Wmentioning

confidence: 99%

Section: B B Wmentioning

confidence: 99%

See 2 more Smart Citations

Asynchronous periodic contact modes for rotor vibration within an annular clearance

Cole

Keogh

2003

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The transition from forward to backward whirl usually involves a series of bouncing motions. In some cases, these bouncing motions can persist indefinitely without the rotor progressing to continuous rub (Tamura et al 2002;. A method to predict steady bouncing whirl motions in radially isotropic rotor-stator systems has been proposed by .…”

Section: (D ) Whirl With Asynchronous Periodic Bouncingmentioning

confidence: 99%

On stability of rotordynamic systems with rotor–stator contact interaction

Cole

2008

Proc. R. Soc. A.

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In machine systems where a rotor spins within a finite clearance space supported by bearings, contact between the rotor and its surround can result in persistent coupled vibration of the rotor and stator. When the vibration response is driven predominantly by friction forces, rotordynamic stability becomes a serious issue. This paper introduces a theory for model-based verification of dynamic stability in rotor systems with stator contact and rub. Generalized multi-degree-of-freedom linear models of rotor and stator lateral vibration are considered, combined with contact models that account for finite clearance and Coulomb friction. State-space conditions for global stability as well as stability of contact-free synchronous whirl responses are derived using Lyapunov's direct method. This leads to feasibility problems involving matrix inequalities that can be quickly verified using numerical routines for convex optimization. Parametric studies involving flexible rotor models indicate that tight bounds on regions of stability can be obtained. A case study involving a realistic machine model illustrates how design optimization based on the theory might be used to overcome instability problems in real machines.

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