Response of a Discontinuously Nonlinear Rotor System

Gonsalves, D. H.; Neilson, Richard David; Barr, A.D.S.

doi:10.1007/978-1-4471-1979-1_23

Cited by 8 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various au-~ thors have studied effects of rotorstator-rub situations similar to this case [12], [9] and [10]. Phenomena like rotor-sub-synchronous vibrations and partly even chaos-like motions have been reported for such Figure 9: Non-stationary deflection of a Jeffcott rotor with non-centric retainer bearing a misalignment.…”

Section: Rotor With Non-centric Retainer Bearingmentioning

confidence: 95%

“…Particular emphasis is put on the sensitivity of the theoretical results to variations of the contact model. Although highly irregular and chaos-like motions caused by rotor-stator impacts have been reported by different authors ( [9], [10], and others), they turn out to be of minor significance for rotors with retainer bearings. A simple model for a rotor in a retainer bearing also used in [11] is shown in figure 1: The Jeffcott rotor consists of an elastic and massless shaft (stiffness kw), which carries an unbalanced disk (mass mw, mass eccentricity CM, damping factor bw).…”

Section: Introductionmentioning

confidence: 90%

See 1 more Smart Citation

Influence of contact and impacts on the dynamics of an elastic rotor with an elastic retainer bearing

Wegener

Markert

1999

Dynamics of Vibro-Impact Systems

View full text Add to dashboard Cite

Section: Rotor With Non-centric Retainer Bearingmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 90%

Influence of contact and impacts on the dynamics of an elastic rotor with an elastic retainer bearing

Wegener

Markert

1999

Dynamics of Vibro-Impact Systems

View full text Add to dashboard Cite

“…Muszynska lately completed his model by adding an elastic recovery coefficient which represents the energy lost when rub-impact happens. Gonsalves et al (1995) proved that a nonlinear rub-impact rotor system with bias has complicated motions with different system parameters. In this section, oil-film force (Jing et al, 2005;Adiletta et al, 1996) is introduced.…”

Section: Rub-impactmentioning

confidence: 99%

Multi-fault diagnosis of rotor system based on differential-based empirical mode decomposition

Beibei

et al. 2013

Journal of Vibration and Control

View full text Add to dashboard Cite

Multi-fault diagnosis of rotor systems is a topical issue in the research of rotor dynamics. Empirical mode decomposition (EMD) has been introduced in fault diagnosis of rotor systems, which has proved to be usable and efficient in single fault diagnosis of a rotor system. However, in multi-fault diagnosis of a rotor system, because of the existence of a high-frequency fault signal, EMD is not as powerful as the diagnosis of a single fault in dealing with the decomposition of multi-faults. In this paper, differential-based empirical mode decomposition (DEMD) is introduced into multi-fault diagnosis of a rotor system. The analysis consequences show that the combination of any two faults among crack, rub-impact and pedestal looseness in multi-fault diagnosis can be decomposed successfully and efficiently under the application of the DEMD method, which is also more accurate and precise than the traditional EMD method.

show abstract

“…Predictions of periodic orbits can be made using harmonic balance methods, based on the rotational frequency, as well as arc length continuation methods [11,12]. F urther studies of these vibration modes are concentrated on non-linear response analyses to identify parametric boundaries for bifurcation and chaotic motion [13,14]. A distinguishing feature of many of these case studies is the presence of radial anisotropy in the rotor system, due to bearing characteristics, misalignment or external loading.…”

Section: B B Wmentioning

confidence: 99%

Asynchronous periodic contact modes for rotor vibration within an annular clearance

Cole

Keogh

2003

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

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.

show abstract

Response of a Discontinuously Nonlinear Rotor System

Cited by 8 publications

References 4 publications

Influence of contact and impacts on the dynamics of an elastic rotor with an elastic retainer bearing

Influence of contact and impacts on the dynamics of an elastic rotor with an elastic retainer bearing

Multi-fault diagnosis of rotor system based on differential-based empirical mode decomposition

Asynchronous periodic contact modes for rotor vibration within an annular clearance

Contact Info

Product

Resources

About