Friction-induced backward rub of rotors in non-annular clearances: Experimental observations and numerical analysis

Behzad, Mahdi; Alvandi, Mehdi

doi:10.1016/j.triboint.2020.106430

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…Despite of the design simplicity there are no results of mathematical and natural modeling for the outer rotorinner stator system and its unseparated dynamics. And this is despite the rather extensive and fresh scientific and technical literature on a similar problem for a typical rotor system with outside stator [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Rolling and whip phenomenon of hollow rotor slipping on internal stator

Никифоров¹

2023

Math. models, eng.

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Dynamic features of a rotor that rolls without or with whipping and slipping of own inner surface on a rigid stator are discussed. Change in the whirling direction associated with the rolling of the rotor from backward to forward was confirmed experimentally, i.e. in the case of an internal type for the stator-limiter in the direction of rotor rotation. Identification of dynamic behavior is made on the basis of eigenfrequencies and eigenmodes, motion orbits of an eccentric point (on the rotor), Campbell diagrams and AFC. The calculation of such characteristics has done using an original mathematical approach developed by the author earlier in order to describe the backward motion of common rotor on an external stator. A good agreement is obtained between the theoretical frequencies and amplitudes of vibration and the experimental ones. Therefore, the author’s technique is also suitable for the revealed forward rotor motion around the internal stator.

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Section: Introductionmentioning

confidence: 99%

Rolling and whip phenomenon of hollow rotor slipping on internal stator

Никифоров¹

2023

Math. models, eng.

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“…There are many different expressions to illustrate the contact law, such as the set-valued functions, the sub-differentials, and the variational inequalities. From different mathematical expressions, different numerical methods [10] can be constructed to reveal the essential laws of contact, including the penalty function method [16] , the Lagrange multiplier method [17] , the augmented Lagrangian method [18] , the linear complementarity problem (LCP) method [19] , etc. In recent years, there have been many studies on the contact dynamics of multibody systems.…”

Section: Introductionmentioning

confidence: 99%

Nonsmooth dynamic analysis of rigid-flexible interaction collision

Tao

et al. 2022

Appl. Math. Mech.-Engl. Ed.

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This paper aims to explore the deformation of the collided bodies in multi-body systems and to effectively simulate the motion path of colliding bodies. First, we describe the geometrically nonlinear problems of materials by the total Lagrangian formulation. Second, a first-order integration scheme is used to solve the dynamics equations. An algorithm combining the bi-potential method with the node-to-point contact identification is proposed to solve the interface problems of rigid-flexible interaction collision. To observe the collision process more intuitively, the internal software FER/VIEW is introduced to visualize the results. The accuracy is proved by comparing the proposed method with the analytical solution or another numerical solution. Moreover, the proposed method has more numerical robustness, such as occupying less computer storage, saving the computational cost, and broadening the application range of the bi-potential method.

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