Analytical prediction on stick-slip whirling oscillations induced by dry friction between a rotating imbalanced rotor and a flexibly supported stator

Wang, Shunzeng; Hong, Li

doi:10.1016/j.jsv.2021.116333

Cited by 15 publications

(3 citation statements)

References 33 publications

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“…Over the past few years, there has been some research conducted in this domain. Studies such as [13][14][15] have focused on investigating the effects of friction on rotor systems in the presence of engine-induced structural vibrations. These works delve into the mechanisms behind friction-induced vibrations, explore the factors that influence the onset and amplitude of these vibrations, and predict self-excited stick-slip whirling oscillations in rotor/stator rubbing systems.…”

Section: Self-excited Vibrations With Frictionmentioning

confidence: 99%

Influence of Weak Structural Vibrations on a Machine-Driven Chain of Mechanical Oscillators with Friction under Varying Normal Forces

Olejnik

2023

Machines

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This work presents a real mechatronic system consisting of coupled inertia oscillators affected by relatively high-frequency structural vibrations. The system’s basic mathematical description is also provided. To simulate real structural vibrations, a vibration exciter in the form of an imbalanced rotor is incorporated into the model. The dynamic behavior of the contacting solid bodies is significantly influenced by the rotating imbalanced mass, which is in frictional contact with the body. The vertical acceleration component resulting from the rotational motion of the imbalance leads to a faster breakage of the sliding contact between the block and the belt, causing a shorter duration of the contact pair in the stick phase. Additionally, the softly coupled pendulum solid body can be utilized to effectively detect weak vibration modes of the self-excited friction oscillator that would otherwise be challenging to observe.

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Section: Self-excited Vibrations With Frictionmentioning

confidence: 99%

Influence of Weak Structural Vibrations on a Machine-Driven Chain of Mechanical Oscillators with Friction under Varying Normal Forces

Olejnik

2023

Machines

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“…Hieu et al investigated the stability and stick-slip motion of a friction-induced vibrating system placed on a belt moving at constant velocity using a two-state model with consideration of the dwell-time effect [29]. Shunzeng Wang et al predicted the selfexcited stick-slip whirling oscillations in a general rotor/stator rubbing system [30], The solution of the dry friction backward whirl for the four-degree-of-freedom non-smooth model with a switching manifold of a curved hypersurface was analytically derived under the hypothesis of pure rolling, which consists of a self-excited back-ward whirl part and a forced forward whirl part. the resultant solution of the self-excited dry friction backward whirl was obtained analytically by superposing the two solution parts of forced forward motion and self-excited backward motion together.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the critical Stick–slip velocity of CNC machine tool combining friction parameters identification and dynamic model

Yang,

Zhou,

et al. 2024

Int J Adv Manuf Technol

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Stick-slip is a negative phenomenon caused by friction in servo feed systems, which is particularly prominent in low-speed and heavy-load conditions. At present, most research on the critical Stick-slip velocity (CSSV) ignores higher-order terms of the equivalent damping ratio, the calculation accuracy is greatly reduced when the system has a large equivalent damping ratio. Firstly, an Improved Stribeck Model based on Least Squares Genetic algorithm (ISM-LSG) is proposed for friction identification, At the same time, the identification of shape parameters of the traditional Stribeck model is extended instead of empirical values. Then, an improved Critical Velocity solving method based on the kinetic model is constructed, and the influence of the higher-order term of the equivalent damping ratio on the critical velocity identification accuracy is analyzed. Finally, this method is verified by the CNC end-face cylindrical grinder with a hard guideway. The friction force identification error with ISM-LSG is reduced 10% compared with the traditional method, and the error of the critical Stick-slip velocity with retaining higher-order term (CSSV-RHT) is reduced 37% compared with the critical Stick-slip velocity by ignoring higher-order term (CSSV-iHT).

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“…The statistical data shows that synchronous frequency is the main component of the structural vibration signal. The bearing vibration is large, while the shaft relative vibration is small [2][3] . Structural vibration rarely occurs on high-pressure and medium-pressure rotors.…”

Section: Introductionmentioning

confidence: 99%

Double resonance peak phenomenon and balance method of rotating machinery with flexible bearing support

Zhang

Yin

et al. 2023

J. Phys.: Conf. Ser.

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A simplified dynamic model of the rotor-bearing-support system is established considering the influence of pedestal flexibility. The vibration characteristics of the system with a flexible pedestal are analyzed. There are two resonance peaks during the run-up process for this kind of system. It is generally thought that the stiffness difference in the vertical and the horizontal direction is the main cause of the double resonance peak phenomenon. The results of the paper show that the flexible pedestal support also causes the double resonance peak phenomenon. The shaft relative vibration cannot reflect the influence of rotor unbalances well near the resonance zone. In this case, the bearing vibration should be preferred in the balance test. The vibration phenomenon on an actual unit is analyzed as an example.

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Analytical prediction on stick-slip whirling oscillations induced by dry friction between a rotating imbalanced rotor and a flexibly supported stator

Cited by 15 publications

References 33 publications

Influence of Weak Structural Vibrations on a Machine-Driven Chain of Mechanical Oscillators with Friction under Varying Normal Forces

Influence of Weak Structural Vibrations on a Machine-Driven Chain of Mechanical Oscillators with Friction under Varying Normal Forces

Analysis of the critical Stick–slip velocity of CNC machine tool combining friction parameters identification and dynamic model

Double resonance peak phenomenon and balance method of rotating machinery with flexible bearing support

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