In this paper, a dynamic model of a “0-2-1” rotor system with rubbing fault between blade and abradable coated casings is developed. The sub-model of rubbing force considers scraping work energy of coating, casing stiffness, and initial clearance between blade tip and casing. A rotor rig is established and samples of abradable coatings are introduced into the rubbing experiment. Vibration characteristics of the rotor system under blade-casing rubbing fault are analyzed. Effects of rotating speed and initial clearance on the rub force and the system vibration are studied. Results show that the vibration of rotor focuses on the fundamental and multiple fundamental frequencies due to the blade-casing rubbing with the abradable coating. The multiple fundamental frequencies, the 2 × and 3 × in particular, are greatly affected by the rotating speed. The fractional harmonic frequencies are strongly influenced by the initial clearance between the blade tip and casing. Besides, the rotating speed and the initial clearance between the blade tip and abradable coating on the casing also affect the amplitude and distribution of the rub force.
JiangJ. Determination of the global responses characteristics of a piecewise smooth dynamical system with contact. Nonlin Dyn2009; 57: 351–361.
2.
YuanZChuFWangS, et al.Influence of rotor's radial rub-impact on imbalance responses. Mech Mach Theory2007; 42: 1663–1667.
3.
BiFShaoKLiuC, et al.Analysis of thermoelastohydrodynamic performance of journal misaligned engine main bearings. Chinese J Mech Eng2015; 28: 511–520.
4.
LuWChuF. Radial and torsional vibration characteristics of a rub rotor. Nonlin Dyn2014; 76: 529–549.
5.
MaHTaiXNiuH, et al.Numerical research on rub-impact fault in a blade-rotor-casing coupling system. J Vibroeng2013; 15: 1477–1489.
6.
Padovan J and Choy F. Nonlinear dynamics of rotor/blade/casing rub interactions. J. Turbomach 1987; 109(4): 527–534.
7.
Jiang J, Ahrens J, Ulbrich H, et al. A contact model of a rotating rubbing blade. In: Proceedings of the 5th international conference on rotor dynamics of the IFTOMM, Darmstadt, Germany, September 1998.
8.
SinhaSK. Dynamic characteristics of a flexible bladed-rotor with Coulomb damping due to tip-rub. J Sound Vib2004; 273: 875–919.
9.
BataillyALegrandMCartraudP, et al.Assessment of reduced models for the detection of modal interaction through rotor stator contacts. J Sound Vib2010; 329: 5546–5562.
10.
MaHYinFGuoY, et al.A review on dynamic characteristics of blade–casing rubbing. Nonlin Dyn2016; 84: 437–472.
11.
ChenG. Simulation of casing vibration resulting from blade–casing rubbing and its verifications. J Sound Vib2016; 361: 190–209.
12.
NanG. Modeling and dynamic analysis of shrouded turbine blades in aero-engines. J Aerosp Eng2016; 29: 04015021.
13.
WangNLiuCJiangD, et al.Casing vibration response prediction of dual-rotor-blade-casing system with blade-casing rubbing. Mech Syst Signal Process2019; 118: 61–77.
14.
WangNJiangDHanT. Dynamic characteristics of rotor system and rub-impact fault feature research based on casing acceleration. J Vibroeng2016; 18: 1525–1539.
15.
XuHWangNJiangD, et al.Dynamic characteristics and experimental research of dual-rotor system with rub-impact fault. Shock Vib2016.
16.
WangBZhengJLuGX. Rubbing contact between rotating blade and casing plate, Part 1–experimental study. Key Eng Mater 2003; 233-236: 725–730. .
17.
Jiang J. Investigation of friction in blade, casing rub and its effect on dynamics of a rotor with rubs. PhD Thesis, Shaker Verlag, Germany, 2001.
18.
Ahrens J, Ulbrich H and Ahaus G. Measurement of contact forces during blade rubbing. In: Proceedings of the 7th international conference on vibrations in rotating machinery of the institution of mechanical engineers, Nottingham, England, September 2000.
19.
PadovaCBartonJDunnMG, et al.Experimental results from controlled blade tip/shroud rubs at engine speed. J Turbomach2007, pp. 129.
20.
MaHTaiXHanQ, et al.A revised model for rubbing between rotating blade and elastic casing. J Sound Vib2015; 337: 301–320.
21.
WangNJiangDBehdinanK. Vibration response analysis of rubbing faults on a dual-rotor bearing system. Arch Appl Mech2017; 87: 1891–1907.
22.
LegrandMBataillyAPierreC. Numerical investigation of abradable coating removal in aircraft engines through plastic constitutive law. J Comput Nonlin Dyn2012; 7: 011010.
23.
BataillyALegrandMMillecampsA, et al.Numerical-experimental comparison in the simulation of rotor/stator interaction through blade-tip/abradable coating contact. J Eng Gas Turbines Power2012, pp. 134.
24.
Batailly A and Legrand M. Conjectural bifurcation analysis of an aircraft engine blade undergoing 3D unilateral contact constraints. In: ASME turbo expo 2014: turbine technical conference and exposition, 2014. American Society of Mechanical Engineers Digital Collection.
25.
BataillyALegrandMMillecampsA, et al.Redesign of a high-pressure compressor blade accounting for nonlinear structural interactions. J Eng Gas Turbines Power2015, pp. 137.
26.
AlmeidaPGibertCThouverezF, et al.Numerical analysis of bladed disk–casing contact with friction and wear. J Eng Gas Turbines Power2016, pp. 138.
27.
SalvatNBataillyALegrandM. Modeling of abradable coating removal in aircraft engines through delay differential equations. J Eng Gas Turbines Power2013, pp. 135.
28.
OlgacNZalluhogluUKammerAS. On blade/casing rub problems in turbomachinery: an efficient delayed differential equation approach. J Sound Vib2014; 333: 6662–6675.
29.
Millecamps A, Batailly A, Legrand M, et al. Snecma’s viewpoint on the numerical and experimental simulation of blade-tip/casing unilateral contacts. In: ASME turbo expo 2015: turbine technical conference and exposition, 2015. American Society of Mechanical Engineers Digital Collection.
30.
YiM-ZZhangX-LHuN-S, et al.Abradability evaluation of seal coating by impact-scraping test machine. Acta Aeronaut Astronaut Sin1999; 20: 249–253.
