Friction-induced vibration of an elastic disc and a moving slider with separation and reattachment

Li, Fulin; Ouyang, Huajiang; Guan, Zhitao

doi:10.1007/s11071-016-3097-2

Cited by 41 publications

(21 citation statements)

References 35 publications

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“…The alternation of stiction and sliding leads to a number of impulses and is called stick-slip. This phenomenon has been studied in many fields [20][21][22], but little has been done in the field of controlling tightening of bolted joints.…”

Section: Stick-slip In Bolted Jointsmentioning

confidence: 99%

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Friction-Induced Vibrations during Tightening of Bolted Joints—Analytical and Experimental Results

2018

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Bolted joints are one of the most used machine elements. Holding together structures of all sizes, the integrity rests on their shoulders. Thus, an accurate and reliable assembly of the joint is crucial. While it is the aim to not experience friction-induced vibrations at all, at some situations, it is unavoidable. These cases, however, have yet been out of the focus of control algorithms due to the volatile nature of the process. This contribution delivers analytical and experimental results for the occurrence of friction-induced vibrations during tightening of bolted joints. Previous findings of system characteristic constants could be validated, which can be used to monitor the tightening process even while strong vibrations during the tightening process occur. Additionally, a real-time algorithm is presented which allows for an advanced process monitoring and control by identifying process characteristics based on which predictions of the process can be made. These measures significantly improve the capabilities to reach the target values of the tightening process.

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Section: Stick-slip In Bolted Jointsmentioning

confidence: 99%

“…One contributor for the occurrence of stick-slip is a significant difference between the friction coefficients for stick and slip [20,21,23]. In order to derive an estimation of the occurrence of stick-slip during tightening of bolted joints, the screw is assumed to be ideally stiff.…”

Section: Analytical Modelmentioning

confidence: 99%

Friction-Induced Vibrations during Tightening of Bolted Joints—Analytical and Experimental Results

2018

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“…Moreover, the modeling of interacting components in low-frequency events in an elastic model with huge numbers of elements and nodes is far from efficient, and the data interpretation is very difficult. As such, theoretical models with varied DOFs have been used to classify varied mechanisms and resources of lowfrequency vibrations [31][32][33]. e sensing and evaluation of "creep groan" noise has been a challenge for the NVH community.…”

Section: Introductionmentioning

confidence: 99%

Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan

Meng

Zhang

et al. 2019

Shock and Vibration

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This paper investigates the creep groan of a vehicle’s brake experimentally, analytically, and numerically. Experimentally, the effects of acceleration on caliper and strut, noise, brake pressure, and tension are measured. The results show that the measured signals and their relevant spectra broadly capture the complex vibrations of creep groan. This includes the simple stick-slip, severe stick-slip vibrations/resonances, multiple harmonics, half-order harmonics; stick-slip-induced impulsive vibrations, steady/unstable vibrations, and their transitions. Analytically, a new mathematical model is presented to capture the unique features of half-order harmonics and the connections to fundamental stick-slip/resonant frequency and multiple harmonics. The analytical solution and the experimental results show that the vibro-impact of the brake pad-disc system can be triggered by severe stick-slip vibrations and is associated with instable, impulsive stick-slip vibration with wideband. The induced stick-slip vibro-impact can evolve into a steady and strong state with half-order, stick-slip fundamental, and multiple-order components. This new mechanism is different from all previously proposed mechanisms of creep groan in that we also view some type of creep groan as a stick-slip vibration-induced vibro-impact phenomenon in addition to conventional stick-slip phenomena. The new mechanism comprehensively explains the complex experimental phenomena reported in the literature. Numerically, the salient features of phase diagrams of instable stick-slip and vibro-impact are examined by using a seven-degree-of-freedom brake system model, which shows that the phase diagrams of the dynamics of creep groan with and without vibro-impact are substantially different. The phase diagram of the dynamics with vibro-impact is closer to the experimental results. In contrast to existing mechanisms, the proposed new mechanism encompasses the instable stick-slip nature of creep groan and elaborates the inherent connections and transition of the spectrogram. The new knowledge can be used to attain critical improvements to brake noise and vibration analysis and design. By applying the proposed new model in addition to existing models, all experimental phenomena in creep groan are elaborated and quantified.

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“…In [37], the sticking and non-sticking orbits of a two-degree-of-freedom oscillator subjected to dry friction and a harmonic load were obtained in a closed form. Li et al [38] developed a model of an elastic disc in sliding frictional contact with a rotating oscillator. Separation of the moving slider form the disc and its subsequent reattachment to the disc were considered, and various dynamic behaviors were discovered.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Simplified Turbine Blade Model with Under-Platform Dry Friction Dampers Considering Normal Load Variation

Ouyang

Ren

et al. 2017

Applied Sciences

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Dry friction dampers are widely used to reduce vibration. The forced vibration response of a simplified turbine blade with a new kind of under-platform dry friction dampers is studied in this paper. The model consists of a clamped blade as two rigidly connected beams and two dampers in the form of masses which are allowed to slide along the blade platform in the horizontal direction and vibrate with the blade platform in the vertical direction. The horizontal and vertical vibrations of the two dampers, and the horizontal and transverse platform vibrations are coupled by friction at the contact interfaces which is assumed to follow the classical discontinuous Coulomb's law of friction. The vertical motion of the dampers leads to time-varying contact forces and can cause horizontal stick-slip motion between the contact surfaces. Due to the relative horizontal motion between the dampers and the blade platform, the vertical contact forces and the resultant friction forces act as moving loads. The Finite Element (FE) method and Modal Superposition (MS) method are applied to solve the dynamic response, together with an algorithm that can capture nonsmooth transitions from stick to slip and slip to stick. Quasi-periodic vibration is found even under harmonic excitation.

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Friction-induced vibration of an elastic disc and a moving slider with separation and reattachment

Cited by 41 publications

References 35 publications

Friction-Induced Vibrations during Tightening of Bolted Joints—Analytical and Experimental Results

Friction-Induced Vibrations during Tightening of Bolted Joints—Analytical and Experimental Results

Sensing and Quantifying a New Mechanism for Vehicle Brake Creep Groan

Dynamic Response of a Simplified Turbine Blade Model with Under-Platform Dry Friction Dampers Considering Normal Load Variation

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