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Xi, Yinhu
Publications (6 of 6) Show all publications
Li, Y., Xi, Y. & Shi, Y. (2018). Estimation of rolling friction coefficients in a tribosystem using optical measurements (ed.). Industrial Lubrication and Tribology, 70(4), 680-686
Open this publication in new window or tab >>Estimation of rolling friction coefficients in a tribosystem using optical measurements
2018 (English)In: Industrial Lubrication and Tribology, ISSN 0036-8792, E-ISSN 1758-5775, Vol. 70, no 4, p. 680-686Article in journal (Refereed) Published
Abstract [en]

Purpose

This paper presents a method to measure the rolling friction coefficient in an easy and fast way. The aim is to measure the rolling friction coefficient between a small steel ball and a cylindrical aluminum surface.

Design/methodology/approach

An analytical model of the tribosystem of a freely rolling ball and a cylindrical surface is established. The rolling friction coefficient is evaluated from images recorded by a high-speed camera. The coefficient between a 1.58 mm diameter steel ball and a cylindrical aluminum surface is measured. A background subtraction algorithm is used to determine the position of the small steel ball.

Findings

The angular positions of the ball are predicted using the analytical model, and good agreement is found between the experimental and theoretical results.

Originality/value

An optical method for evaluating the rolling friction coefficient is presented, and the value of this coefficient between a small steel ball and a cylindrical aluminum surface is evaluated.

Place, publisher, year, edition, pages
Emerald Group Publishing Limited, 2018
National Category
Applied Mechanics Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Experimental Mechanics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-5804 (URN)10.1108/ILT-04-2016-0087 (DOI)000434250800012 ()2-s2.0-85048166333 (Scopus ID)3fccd069-0a30-4736-8462-4ac31ed3db8e (Local ID)3fccd069-0a30-4736-8462-4ac31ed3db8e (Archive number)3fccd069-0a30-4736-8462-4ac31ed3db8e (OAI)
Note

Validerad;2018;Nivå 2;2018-06-05 (svasva)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-21Bibliographically approved
Xi, Y., Zhao, Y., Larsson, R. & Mao, J. (2018). Time-dependent hysteresis friction behaviors of linear rolling bearings. Paper presented at 12th International Conference on Frontiers of Design and Manufacturing (ICFDM), Natl Nat Sci Fdn China, Shenyang, August 10-12, 2016. The International Journal of Advanced Manufacturing Technology, 94(9-12), 3109-3116
Open this publication in new window or tab >>Time-dependent hysteresis friction behaviors of linear rolling bearings
2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 94, no 9-12, p. 3109-3116Article in journal (Refereed) Published
Abstract [en]

Hysteresis friction behaviors of linear rolling bearings (LRBs) are important for precision positioning applications, which are related to the displacement and the traversed trajectory history within pre-rolling friction region. Although these behaviors have been pointed out in literature, the time dependence of transient hysteresis friction behaviors has not been reported before. In this work, the effects of initial conditions induced by the applied forces prior to commencement of the hysteresis motion are considered, which are denoted by the differences between the magnitudes of positive endpoints and the magnitudes of negative endpoints of virgin curves for the obtained asymmetrical hysteresis loops. The evolution of the time dependence is denoted by the decaying of the differences with the increasing dwell time. The effects of the damping and the junction growth during the dwell time are used to explain the time-dependent hysteresis friction behaviors of the LRB. The experiments of higher preload and lubrication-free conditions have been implemented as well, and the results indicate that the conditions are positive to diminish the time-dependent hysteresis friction behaviors.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-60104 (URN)10.1007/s00170-016-9425-3 (DOI)000425592900009 ()
Conference
12th International Conference on Frontiers of Design and Manufacturing (ICFDM), Natl Nat Sci Fdn China, Shenyang, August 10-12, 2016
Note

2018-02-20 (rokbeg);konferensartikel i tidskrift

Available from: 2016-11-02 Created: 2016-11-02 Last updated: 2018-04-17Bibliographically approved
Xi, Y., Björling, M., Shi, Y., Mao, J. & Larsson, R. (2017). Application of an inclined, spinning ball-on-rotating disc apparatus to simulate railway wheel and rail contact problems. Wear, 374-375, 46-53
Open this publication in new window or tab >>Application of an inclined, spinning ball-on-rotating disc apparatus to simulate railway wheel and rail contact problems
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2017 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 374-375, p. 46-53Article in journal (Refereed) Published
Abstract [en]

Railway wheel-rail contacts involve various combinations of slip, rolling, and creepage. Traditionally, a twin-disc apparatus is used to simulate such problems. However, there are out of plane forces and motions involved in the actual situation. Therefore, the possibility of using a commercially-made, inclined-axis spinning ball-on-disc test rig was investigated to better simulate wheel and rail contact problems. By setting two angle parameters both the lateral and spin creepage can easily be applied to the contact. Traction measurements were conducted, and good agreement was found by comparing the present results with other available experimental data. The effects of the spin creepage on wear were studied in particular. An asymmetrical wear pattern was obtained from cases that applied a low longitudinal creepage and a spin creepage, corresponding to a rail running on a curved track. To the best of the authors' knowledge, this work is the first of its kind to be done using a laboratory-scale tribometer.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-61325 (URN)10.1016/j.wear.2016.12.034 (DOI)000395954700007 ()2-s2.0-85008500847 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-01-09 (andbra)

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2018-09-13Bibliographically approved
Xi, Y., Almqvist, A., Shi, Y., Mao, J. & Larsson, R. (2017). Linear Complementarity Framework for 3D Steady-State Rolling Contact Problems Including Creepages with Isotropic and Anisotropic Friction for Circular Hertzian Contact (ed.). Tribology Transactions, 60(5), 832-844
Open this publication in new window or tab >>Linear Complementarity Framework for 3D Steady-State Rolling Contact Problems Including Creepages with Isotropic and Anisotropic Friction for Circular Hertzian Contact
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2017 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 60, no 5, p. 832-844Article in journal (Refereed) Published
Abstract [en]

In this article, the problem of 3D steady-state rolling contacts with dry friction for circular Hertzian contacts is formulated mathematically as a linear complementarity problem (LCP). The complementarity variables are the traction and the relative slip of contact regions, in which a polyhedral friction law is employed. The present work uses the general expressions describing the surface deformations due to uniform traction over a rectangular area on an elastic half-space to derive the influence coefficient matrix for rolling contact problems. Three possible creepage types—that is, longitudinal, lateral, and spin creepage—are considered in this work. Firstly, the numerical results are verified against the existing numerical solutions and good agreement has been found. Secondly, the anisotropic friction is studied by the verified approach. Some numerical examples are provided to illustrate the current LCP method for both isotropic and anisotropic friction in which the combined effects of the three kinds of creepage on the traction distribution are shown.

Place, publisher, year, edition, pages
Taylor & Francis, 2017
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-13986 (URN)10.1080/10402004.2016.1217111 (DOI)000417649800009 ()2-s2.0-84994164370 (Scopus ID)d4f4efe0-66d5-41b7-bbda-30c35a0fd36b (Local ID)d4f4efe0-66d5-41b7-bbda-30c35a0fd36b (Archive number)d4f4efe0-66d5-41b7-bbda-30c35a0fd36b (OAI)
Note

Validerad;2017;Nivå 2;2017-08-28 (rokbeg)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Xi, Y., Almqvist, A., Shi, Y., Mao, J. & Larsson, R. (2016). A Complementarity Problem–Based Solution Procedure for 2D Steady-State Rolling Contacts with Dry Friction (ed.). Tribology Transactions, 59(6), 1031-1038
Open this publication in new window or tab >>A Complementarity Problem–Based Solution Procedure for 2D Steady-State Rolling Contacts with Dry Friction
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2016 (English)In: Tribology Transactions, ISSN 1040-2004, E-ISSN 1547-397X, Vol. 59, no 6, p. 1031-1038Article in journal (Refereed) Published
Abstract [en]

The problem of steady-state rolling contact between two cylinders with dry friction was formulated into standard linear complementarity problems (LCPs) by using the explicit physical definition. For normal contact, the complementarity variables are the normal pressure and the gap. For the tangential contact, the traction distribution and relative slip are the variables obtained by solving the LCP. The frictional behavior is assumed to be governed by the Coulomb friction law, and LCP formulations of both similar elastic (Carter problem) and dissimilar elastic rolling contacts are presented in this work. Good agreement was found between the current LCP approach and publicly available software for both the rolling contact of similar elastic and dissimilar elastic cylinders. Moreover, the surface roughness was taken into account in this paper by the verified approach. The results show the initial slope of the traction - relative creepage curve decreases as the surface roughness increases.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-5629 (URN)10.1080/10402004.2015.1131348 (DOI)000386343600006 ()2-s2.0-84991054921 (Scopus ID)3c91037d-7977-4b39-922b-6ab688367437 (Local ID)3c91037d-7977-4b39-922b-6ab688367437 (Archive number)3c91037d-7977-4b39-922b-6ab688367437 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-10-19 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Xi, Y., Björling, M., Shi, Y., Mao, J. & Larsson, R. (2016). Traction formula for rolling-sliding contacts in consideration of roughness under low slide to roll ratios. Tribology International, 104, 263-271
Open this publication in new window or tab >>Traction formula for rolling-sliding contacts in consideration of roughness under low slide to roll ratios
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2016 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 104, p. 263-271Article in journal (Refereed) Published
Abstract [en]

Based on the numerical results of a wide range of parameters in terms of the linear complementarity framework, an easy-to-use formula is presented by using the regression analyses to estimate the traction coefficient for rolling-sliding contacts under low Slide-to-Roll Ratio (SRR) domain for dry condition. The parameters include geometry, surface roughness, SRR and friction coefficient and contact radius. The formula's predictions are in good agreement with measurements using a ball on disc test rig. The results indicate that for steel-steel contact, the effects of third body layer and plasticity on the traction can almost cancel each other out. In addition, by revising the expression proposed by Masjedi and Khonsari, the formula is extended to estimate the cases under mixed lubrication.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-59619 (URN)10.1016/j.triboint.2016.09.006 (DOI)000386186500025 ()2-s2.0-84986888693 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-10-10 (andbra)

Available from: 2016-10-10 Created: 2016-10-10 Last updated: 2018-07-10Bibliographically approved
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