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Evolution of aggregate surface texture due to tyre-polishing

Journal of Central South University 2011年第1期18卷 259-265页

作者：陈先华 B.STEINAUER 王大为 Transportation College Southeast University Institute of Road and Traffic Engineering RWTH-Aachen UniversityD52074Germany

Three kinds of aggregates were polished by genuine pneumatic rubber *** initial states of surface texture and dynamic friction coefficient were measured and their developments in polishing process were *** characterizations of height distribution and power spectral density of aggregate surface texture were *** changes of micro-texture were also investigated based on a fractal filtering method with sound theoretical backgrounds of rubber friction on rough *** height reduction and differential removal of mineral component are observed in polishing *** is concluded that the tyre-polishing action plays the critical roles in the micro-scale texture,and the evolution of friction of aggregate is governed by the micro-texture changes due to the differential removal of mineral component.

关键词： tyre polishing dynamic friction coefficient aggregate surface texture micro-texture

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Development and validation of an integrated mechatronic apparatus for measurement of friction coefficients of agricultural products

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Information Processing in Agriculture 2020年第1期7卷 93-108页

作者： S.M.Shafaei A.Nourmohamadi-Moghadami S.Kamgar M.Eghtesad Department of Biosystems Engineering School of AgricultureShiraz UniversityShiraz 71441-65186Iran Department of Solid Mechanics Engineering School of Mechanical EngineeringShiraz UniversityShiraz 71348-51154Iran

An integrated mechatronic apparatus was developed based on tilting plate method in order to precisely measure static friction coefficient(SFC)and dynamic friction coefficient(DFC)of agricultural *** apparatus consisted of two main parts(mechanical and electrical parts).The main element of mechanical part was rotary ***,the electrical part included control,display,goniometer,level controller,rotational power supply,and infrared *** apparatus was initially simulated in simulation environment and practically calibrated to achieve high precision *** appraise performance of the apparatus,the SFC and DFC of three grains were measured on five contact *** were also conducted by means of a typical apparatus operating based on puling force *** statistical descriptor parameters such as mean absolute percentage error(MAPE),average of absolute values of measurement errors(AAVME),maximum of absolute values of measurement errors(MAVME),and correlation coefficient were used to compare accuracy of the apparatus with the typical *** acceptable AAVME(coefficient(>0.9)indicated high accuracy,stability,and efficiency of the apparatus for automatic measurements of the SFC and *** practical point of view,the mechatronic apparatus would be a beneficial tool for experimental,educational,demonstrational,and research works.

关键词： Static friction coefficient dynamic friction coefficient Physical property friction force

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Effect of surface roughness on the surface lubrication performance of galvanized steel sheets with a self-lubricated coating

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Baosteel Technical Research 2017年第3期11卷 43-47页

作者： YANG Jiayun DONG Hang DAI Yigang Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Engineering University of CAPF Xi' an 710086 Shaanxi China

Four kinds of galvanized steel sheets having different surface roughness values were used to prepare the steel sheets with a self-lubricated coating. The effects of surface roughness on the surface lubrication performance of the steel sheets were examined using a friction coefficient tester. Results revealed large dynamic friction coefficients for the galvanized steel sheets, which increased remarkably with surface roughness. Once the self-lubricated coating was applied, significant drops in the dynamic friction coefficients were measured. After the first stage of the friction test,the coefficients were almost unchanged, which reflected a weak dependence on the surface roughness of the self-lubricated steel sheets. However, the dynamic friction coefficients gradually increased as the test progressed, where these increase clearly correlated with the surface roughness of the self-lubricated steel sheets.

关键词： surface roughness self-lubricated coating galvanized steel sheet dynamic friction coefficient

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