Light and short arc rubs in rotating machines: Experimental tests and modelling

Pennacchi, Paolo; Bachschmid, N.; Tanzi, Elisabetta

doi:10.1016/j.ymssp.2009.03.008

Cited by 46 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ma et al [12], Sinha [13], Khanlo et al [14], and Liao et al [15] showed the methodologies to determine the bouncing and rolling contact loads of rub-impact between a flexible spinning shaft and an outer cylindrical ring. On experimental research, Pennacchi [16] presented an experimental study and a mathematical model to analyze the effects of rotor-to-stator rub on seals. Chu and Lu [17] installed an experimental setup to analyze nonlinear responses and bifurcation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Research on Blade‐Casing Rub‐Impact Mechanism by Experiment and Simulation in Aeroengines

Hong

Liang³

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

Aeroengines pursue high performance, and compressing blade-casing clearance has become one of the main ways to improve turbomachinery efficiency. Rub-impact faults occur frequently with clearance decreasing. A high-speed rotor-support-casing test rig was set up, and the mechanism tests of light and heavy rub-impact were carried out. A finite element model of the test rig was established, and the calculation results were in good agreement with the experimental results under both kinds of rub-impact conditions. Based on the actual blade-casing structure model, the effects of the major physical parameters including imbalance and material characteristics were investigated. During the rub-impact, the highest stress occurs at the blade tip first and then it is transmitted to the blade root. Deformation on the impact blade tip generates easily with decreased yield strength, and stress concentration at the blade tip occurs obviously with weaker stiffness. The agreement of the computation results with the experimental data indicates the method could be used to estimate rub-impact characteristics and is effective in design and analyses process.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on Blade‐Casing Rub‐Impact Mechanism by Experiment and Simulation in Aeroengines

Hong

Liang³

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Partial rubbing between the rotor and stator are also extensively investigated in the literatures [8][9][10][11][12][13][14][15][16][17]. Beatty [8] analyzed the rotor response due to the radial rubbing, which is described as a function of the rotor contact circumference based on a combination of analytical and experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…Choi [11] investigated the partial rotor rub experimentally and analytically to understand the rubbing phenomenon. To reproduce what happens in real systems when the shaft-line interferes with labyrinth seals, Pennacchi et al [12] presented an experimental study and a mathematical model and analyzed the effects of rotor-to-stator rub on seals.…”

Section: Introductionmentioning

confidence: 99%

“…Sawicki et al [28] presented an analytical study of the dynamics and stability of rotors subjected to rubbing, taking account of associated thermal effects. Considering the rub-induced force impact and heat impact together, Tian and Yang [29] The mechanical model of the rotor-stator rubbing mostly adopts the piecewise-smooth model and the classical coulomb friction model [1,3,4,6,12,13,15,22,24]. In recent years, the rotor-stator rubbing simulated by the contact theory has become widely researched [2,5,9,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Zhao

et al. 2015

Applied Mathematical Modelling

View full text Add to dashboard Cite

Dynamic characteristics of a rotor rubbing with circular stator and four pin shape stators are studied based on contact dynamics theory. Based on finite element (FE) method, the rotor system attached with two disks and pin shape stators are simulated by Timoshenko beam. The circular stator is simulated by a lumped mass model, and the rotor and stator are connected by one or more point-point contact elements to establish the dynamic model of the rotor-stator coupling system. Assuming that the rubbing is caused by the sudden impact excitation and sudden unbalance excitation under two loading conditions (condition 1: in-phase unbalances of two disks at the first critical speed, condition 2: out-of-phase unbalances of two disks at the second critical speed), the system dynamic characteristics are analyzed by the time-domain waveform, rotor orbit, normal contact/rubbing force and stator acceleration. The results show that the rubbing caused by the sudden impact under the loading condition 2 will always exist and the rubbing will excite quasi-periodic motion of the rotor system; combination frequency components about the rotating frequency (1×) and the first lateral natural frequency of the rotor-stator coupling system (f n1 ) can be viewed as the most distinguishable characteristic. Full annular rubbing may appear due to the sudden unbalance excitation under the loading condition 1, the four-point rubbing can restrain the subsynchronous vibration and mainly excites odd multiple frequency components, such as 3×, 5×, etc.

show abstract

“…The results show a very considerable variation of the friction coefficient as a function of the operating range. Pennachi [35] also observed experimentally a substantial variation of the friction coefficient close to critical speed. Choi [36] specified that the ratio between tangential and normal forces at the contact should not be associated with the friction coefficient.…”

Section: Major Parameters Involvedmentioning

confidence: 75%

Rotor to stator contacts in turbomachines. Review and application

Jacquet‐Richardet

Torkhani

Cartraud

et al. 2013

Mechanical Systems and Signal Processing

182

View full text Add to dashboard Cite

International audienceThe safety of turbomachines requires controlling the risks caused by contacts occurring between fixed and rotating parts. Undesirable phenomena induced by bladed wheel/casing interactions are caused by the forced excitation of the natural modes of a blade leading to its damage or by potentially dangerous couplings between the modes of the casing and those of the wheel. Rotor-stator contacts may also lead to various types of dangerous behavior, including the well known configurations of dry whirl and dry whip. The paper proposes a large-scale literature review and examines existing numerical models and experimental setups used for highlighting the phenomenology involved in different rotor to stator contacts configurations. It confirms the great complexity of the problems which, by nature, are considerably nonlinear and involve multiphysics and multiscale coupled behaviors

show abstract

Light and short arc rubs in rotating machines: Experimental tests and modelling

Cited by 46 publications

References 28 publications

Research on Blade‐Casing Rub‐Impact Mechanism by Experiment and Simulation in Aeroengines

Research on Blade‐Casing Rub‐Impact Mechanism by Experiment and Simulation in Aeroengines

Dynamic characteristics analysis of a rotor–stator system under different rubbing forms

Rotor to stator contacts in turbomachines. Review and application

Contact Info

Product

Resources

About