Measurement of Friction Noise Versus Contact Area of Rough Surfaces Weakly Loaded

Bot, Alain Le; Chakra, E. Bou

doi:10.1007/s11249-009-9521-8

Cited by 38 publications

(4 citation statements)

References 21 publications

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“…The static equilibrium is easily obtained as u s = (N/K) 2/3 . Introducing the new variable q defined by u = u s (1 + 2 3 q), u = 2us 3 q and ü = 2us 3 q leads to: 2mu s 3 q + Ku s 3/2 (1 + 2αu s 3 q)(1 + 2 3 q) 3/2 = N. (19) Now we can linearise the motion equation around the static equilibrium q = 0, that is:…”

Section: Appendix: Multi-asperity Contact Modelmentioning

confidence: 99%

“…When the slider and/or track are not perfectly rigid, and when the sliding speed is large enough, the interaction between the two rough surfaces is a succession of micro-impacts between antagonist asperities, which trigger a vibration of the solids, through not only their rigid body modes, but also their other eigenmodes. Overall, those vibrations are the source of the so-called roughness noise [16], the empirical laws of which have been studied extensively [17][18][19][20]. However, such empirical laws remain unexplained, and both numerical modelling [21] and statistical analyses [22] point towards the challenging need to better describe the forces involved in the individual, sub-millisecond-lived micro-impacts.…”

Section: Introductionmentioning

confidence: 99%

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Design and characterization of an instrumented slider aimed atmeasuring local micro-impact forces between dry rough solids

Grégoire,

Laulagnet,

Liaudet

et al. 2020

Preprint

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Sliding motion between two rough solids under light normal loading involves myriad micro-impacts between antagonist micro-asperities. Those micro-impacts are at the origin of many emerging macroscopic phenomena, including the friction force, the slider's vibrations and the noise radiated in the surroundings. However, the individual properties of the micro-impacts (e.g. maximum force, position along the interface, duration) are essentially elusive to measurement. Here, we introduce an instrumented slider aimed at measuring the position and the normal component of the micro-impact forces during sliding against a rough track. It is based on an array of piezoelectric sensors, each placed under a single model asperity. Its dynamical characteristics are established experimentally and compared to a finite elements model. We then demonstrate its relevance to tribology by using it against a track bearing simple, well-defined topographical features. The measurements are interpreted thanks to a simple multi-asperity contact model.

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Section: Appendix: Multi-asperity Contact Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and characterization of an instrumented slider aimed atmeasuring local micro-impact forces between dry rough solids

Grégoire,

Laulagnet,

Liaudet

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Ben Abdelounis H [10] studied the friction noise between dry surfaces, and concluded that dry contact and roughness under light pressure were the main causes of the noise. Alain Le Bot E [11] explored the frictional noise of rough surfaces in contact with a light load. It was found that the main mechanism of sound generation was the normal vibration of the surface caused by the impact between opposing rough bodies, and the friction noise is dependent on the contact area of the rough surface.…”

Section: Introductionmentioning

confidence: 99%

Research on Improving NVH Performance of Automobile Side Door Glass in Use Based on 6 Sigma Method

Shi

Wang

et al. 2021

Materials

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Automobile side door glass squeaks and rattles during use. This abnormal noise can make the driver and occupants irritable and reduce the comfort of the automobile. This reduces the sales of this automobile. This paper analyzes and determines the cause of squeak and rattle during the lifting and lowering process of the side door glass of an automobile. The noise is due to four reasons. One is that the distance between the inner waterproof belt and the automobile side door glass of the automobile is unreasonable, causing excessive friction between the automobile side door glass and the inner waterproof belt during the automobile side door glass up and down movement. Other factors affecting squeak and rattle may be the distance between the automobile side door sheet metal and the automobile side door glass, the thickness of the automobile side door glass and the characteristics of the inner waterproof belt. The first two dimensions are analyzed using the 6 sigma method, and the structure of the inner waterproof belt is improved and the flocking position is adjusted. The squeak and rattle phenomenon is explained using the implicit dynamic analysis method ABAQUS, and the compression load deflection after the installation of the inner waterproof belt is 3–9 N/100 mm. This research completely solves the squeak and rattle problem caused by the up and down movement of the side door glass of the automobile. This research has significance for solving practical engineering problems.

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“…It is well known that sound filters solid body vibrations because of own physical properties of wave media. Vibration of bearing components is also nonuniform physically based, but the lion’s share in noise components belongs to the friction noise (Bučinskas et al, 2010; Gharesi et al, 2018; Hruntovich et al, 2019; Le Bot and Bou Chakra, 2010; Lu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Reducing the vibration of bearing units of electric vehicle asynchronous traction motors

Migal

Lebedev

Shuliak

et al. 2020

Journal of Vibration and Control

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The impact of the accuracy class of bearings, rotational speed, load, clearances, and fits on the vibration levels of electric motor bearing units is investigated. The ways to reduce the vibrations of mechanical origin are offered. The boundary vibration levels of asynchronous motors limited by vibration levels of 40 dB at a frequency of 5 Hz and 80 dB at a frequency of 10,000 Hz are determined. The effect of increasing the rotational speed and load on the vibration levels of bearing units has been determined, and reserves for reducing vibration while ensuring the optimum bearing preload on the shaft journal have been identified. It is established that the clearance between the cap and the bearing when it is fixed in the housing (primer) does not ensure the unambiguity of the bearing unit assembly, which results in a large variation in vibration levels compared with rigid and elastic fixation. The results of this research can be applied to all types of traction electric motors.

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Measurement of Friction Noise Versus Contact Area of Rough Surfaces Weakly Loaded

Cited by 38 publications

References 21 publications

Design and characterization of an instrumented slider aimed atmeasuring local micro-impact forces between dry rough solids

Design and characterization of an instrumented slider aimed atmeasuring local micro-impact forces between dry rough solids

Research on Improving NVH Performance of Automobile Side Door Glass in Use Based on 6 Sigma Method

Reducing the vibration of bearing units of electric vehicle asynchronous traction motors

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