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Advances in friction of aluminium alloy deep drawing

friction 2024年第3期12卷 396-427页

作者： Yiren GAO Hongxia LI Danyang ZHAO Minjie WANG Xiaobo FAN School of Mechanical Engineering Dalian University of TechnologyDalian 116023China

Broad use of lightweight aluminium alloy parts in automobile manufacturing,aerospace,electronic communication,and rail transit is mainly formed through deep drawing *** drawing friction is a key boundary condition for controlling the forming quality of aluminium alloy ***,due to the oxidation and adhesion tendency of aluminium alloys,the tribological situations of aluminium alloy deep drawing(AADD)system is more complicated than those of traditional deep drawing of steel ***,the study of AADD friction is essential for manufacturing high-performance aluminium alloy ***,aiming to provide a valuable reference for researchers in related fields,a comprehensive review of AADD friction is provided,including friction mechanism,influencing factors,friction measurement,friction model,friction simulation,and lubrication-free friction ***,a brief conclusion and several current challenges were discussed.

关键词： aluminium alloy deep drawing(AADD) influencing factors friction measurement friction model friction control

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Slipping Time and Velocity of Footwear Samples in friction measurements

Slipping Time and Velocity of Footwear Samples in Friction M...

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第17届工业工程与工程管理国际学术会议(IE&EM2010)

作者： H.F.Tsai Department of Industrial Management Chung-Hua UniversityHsin-ChuTaiwan

A friction measurement experiment was conducted using the Brungraber MarkⅡ*** coefficient of friction(COF),the time and velocity of slipping of the footwear sample on the floor were measured under four floors and two surface *** operators performed the measurements *** results showed that there were no significant differences between the two operators in measuring all the dependent *** ANOVA results showed that the floor,surface conditions, and their interactions affected the COF and velocity of slipping significantly(pfriction measurement device that require slip/non-slip judgment.

关键词： slips & falls friction measurement slip velocity Brungraber MarkⅡ

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Relationship Between Measured friction Coefficients and Two Tread Groove Design Parameters for Footwear Pads

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Tsinghua Science and Technology 2006年第6期11卷 712-719页

作者： LI Kai Way CHEN Chin Jung LIN Ching-Hua HSU Yao Wen Liberty Mutual Research Institute for Safety 71 Frankland RoadHopkinton MA 01748 USA Department of Industrial ManagementChung-Hua University770 Wu Fu RoadSec 2Hsin ChuTaiwan 300China Department of Industrial Management Chung-Hua University770 Wu Fu RoadSec 2 Hsin ChuTaiwan 300 China Industrial Engineering and Management Department TA-Hwa Institute of Technology1 Dahua RoadQionglin ShiangHsinchu CountyTaiwan 307China

The shoe sole geometrical design parameters are believed to be important factors affecting the coefficient of friction （COF） between the shoe/floor interface. This study is concerned with the relationship between the measured COF and the tread groove orientation and width on the footwear pad. friction measurements using the Brungraber Mark Ⅱ slipmeter were conducted. Six tread groove width/orientations designs on the footwear pads under 27 footwear material/floor/contamination conditions were tested. The results show that tread orientation and width affect the measured COF significantly. Wider grooved footwear pads result in higher COF values and footwear pads with tread grooves perpendicular to the friction measurement direction have higher COF values. A regression model using measured COF as the dependent variable and tread groove width, groove orientation, footwear material, floor, and contamination conditions as independent variables was established. The models are significant at p〈0.0001 with R^2 of 0.97, which may be used in predicting the COF at the shoe-floor interface .

关键词： slipping and falling incidents friction measurement tread groove design Brungraber Mark Ⅱ slipmeter

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Contactless measurement of Permanent Magnet Motor Performances

Contactless Measurement of Permanent Magnet Motor Performanc...

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第十三届中国小电机技术研讨会

作者： Quan JIANG Chao BI S.LIN (A*STAR Data Storage Institute,Singapore 117608)

Each year,a huge volume of permanent magnet (PM) motors are produced and *** important quality testing of PM motors are to measure their back EMFs and friction *** paper introduces two contactless methods to measure the back EMFs and their harmonic components only through a freewheeling procedure and the friction torque with self-sensing *** mechanical coupling,the driving motor and the torque sensor can be omitted and the testing procedure can be greatly simplified and *** order to eliminate the influence of the freewheeling speed deceleration,the phase flux-linkages are employed to obtain the back EMF amplitudes and phases of the fundamental and harmonic components by using the finite Fourier series *** proposed method makes the freewheeling measurement of the back EMFs and their harmonics to be an accurate and fast and it is especially useful for PM motors with a small ratio of inertia to *** friction torque,including the bearing,windage and core losses of a PM motor is a key performance *** should be accurately tested during R&D and mass *** the proposed self-sensing method,the friction torque can be measured more precisely and easily

关键词： motor testing permanent magnet motors back emf friction measurement

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