Characteristics of stick-slip oscillations in dry friction backward whirl of piecewise smooth rotor/stator rubbing systems

Wang, Shunzeng; Hong, Li

doi:10.1016/j.ymssp.2019.106387

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…It is important to grasp the characteristics of rubbing from the viewpoint of the remaining life assessment and the anomaly detection of equipment [1] [2]. A lot of research intended for rubbing have been conducted until now, but most of them [3] consider only translational motions and ignore rotational motions related to the directions perpendicular to the axial direction of a rotating body. The influences of deflection angles of a rotating body should be considered because translational motions and rotational motions related to the directions perpendicular to the axial direction of it couple.…”

Section: Extended Abstractmentioning

confidence: 99%

A Study on Analysis of Behavior of Rubbing considering Deflection Angles of a Rotating Body

Yoshimori,

Sugawara,

Takeda

2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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Section: Extended Abstractmentioning

confidence: 99%

A Study on Analysis of Behavior of Rubbing considering Deflection Angles of a Rotating Body

Yoshimori,

Sugawara,

Takeda

2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

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“…Therefore, the identification for a rub-impact fault is an important research direction (Srivastava et al, 2021). Wang et al (2020) apply kinetic theory and analyze response characteristics of rotor–stator rub-impact through studying piecewise smooth rotor–stator of rubbing system. For effectively extracting the rub-impact fault features, Li et al (2014) construct a segmented threshold function of rub-impact faults and denoise the signals with dual-tree complex wavelet transform.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the analysis of non-linear and non-stationary signals, variational mode decomposition (VMD) was proposed by Dragomiretskiy K. This method is capable to keep empirical mode decomposition from modal aliasing and has very excellent robustness against noise component (Li et al, 2020). Wang et al (2021) combine VMD and Rihaczek distribution to obtain the time–frequency representation; the effectiveness of this method has been proved by the fault analysis for diesel engine. VMD and Hilbert envelope spectrum is integrated to extract rub-impact faults of rotary machinery (Zhao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Identification of rotor–stator rub-impact faults based on dual complexity parameters

Guo

Yunhong

2022

Journal of Vibration and Control

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For effective identification of rub-impact faults between rotor and stator of equipment, the paper has contributed the method integrating dual complexity parameters and variational mode decomposition (VMD). Firstly, to effectively separate the fault characteristics involved in signals, VMD algorithm was applied to decompose vibration signals and the component signals were obtained; secondly, taking account of the large difference of fault feature information involved in different component signals and in order to make options of sensitive fault component signals and reduce the loss of fault features, multi-scale Lempel–Ziv complexity and complexity parameter in Hjorth parameters were brought. Starting from 2 different perspectives of complexity evaluation, choose from the sensitive component signals containing more fault characteristics with these 2 complexity parameters; thirdly, signals were reconstructed based on selected sensitive component signals, and meanwhile, singular value difference spectrum algorithm was used to denoise reconstructed signals to further lessen the influence of noises; finally, the rub-impact fault between rotor and stator was identified by square demodulation spectrum (SDS) of denoised signal. The effectiveness of the proposed method has been proved by comparative analysis with other approaches as well as validation analysis of rub-impact fault signals in multiple situations.

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“…The selfinduced vortex of reverse dry friction caused by the rotor/stator system interaction is the most destructive re sult of their friction [5,6].…”

mentioning

confidence: 99%

Designing the working surfaces of rotary planetary mechanisms

Alrefo,

Matsulevych,

Vershkov

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To design a method for smoothing the working surfaces of stator and rotor with the use of computer simulation to eliminate the impact of the rotor on the stator when they interact. Methodology. Special and general methods of research have been used: interpolation of the point series – to determine the contour nodes of the rotor and the stator of the rotary-planetary machine; formation of B-splines – to construct a point series whose coordinates are structurally determined; technology of automated formation of curves in CAD-system SolidWorks – for modelling of functional surfaces of a planetary-rotary compressor. Findings. Algorithms for formation of the contours representing curves defined analytically or constructively with a given accuracy have been developed. The obtained contours are used in the CAD system as linear elements of the surface model. The developed method has been tested in the simulation of functional surfaces of a planetary-rotary compressor. Optimization of the body shape and rotor profiles in order to increase the productivity of the rotary-planetary machine has been carried out. Originality. The developed algorithms make it possible to determine the original point series belonging to any curve and provide a given interpolation accuracy when forming a B-spline contour or second-order curve arcs. Computer models of the body surfaces of the rotor are formed on the basis of the gear ratio of the planetary-rotary mechanism and the rotor dimensions. In order to increase the performance of the compressor, the working surfaces of the rotor have been optimized. The maximum volume of the working chamber was increased by increasing the radius of the moving gear of the planetary-rotary mechanism. In order to prevent the rotor from jamming during compressor operation, the rotor contour was changed. Practical value. The method for modelling the surfaces of complex shape in CAD-system has been developed on the basis of creating contours which with given accuracy represent lines from the surface determinant. This method makes it possible to form computer models of complex surfaces on the basis of a framework consisting of curves absent in CAD libraries.

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Characteristics of stick-slip oscillations in dry friction backward whirl of piecewise smooth rotor/stator rubbing systems

Cited by 14 publications

References 26 publications

A Study on Analysis of Behavior of Rubbing considering Deflection Angles of a Rotating Body

A Study on Analysis of Behavior of Rubbing considering Deflection Angles of a Rotating Body

Identification of rotor–stator rub-impact faults based on dual complexity parameters

Designing the working surfaces of rotary planetary mechanisms

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