Articles de revues : « Motorized »

1

Huzaifah, Khan Mohammed. « Motorized Bicycle ». International Journal for Research in Applied Science and Engineering Technology 7, n^o 3 (31 mars 2019) : 1412–14. http://dx.doi.org/10.22214/ijraset.2019.3259.

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Marshall, Wallace F. « Motorized meiosis ». Trends in Cell Biology 9, n^o 10 (octobre 1999) : 386. http://dx.doi.org/10.1016/s0962-8924(99)01655-4.

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3

Stenson, Mary. « Physiological Differences Between Motorized and Non-Motorized Treadmill Running ». Medicine & ; Science in Sports & ; Exercise 51, Supplement (juin 2019) : 932. http://dx.doi.org/10.1249/01.mss.0000563293.50035.a8.

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4

Zhou, Zhao, Jian Bo Wang, Chao He, Xiao Li Fang, Dan Xiong et Meng Meng Wei. « The Relationship between Non-Motor Vehicle Lane's Utilization and Width and Other Factors ». Applied Mechanics and Materials 505-506 (janvier 2014) : 827–31. http://dx.doi.org/10.4028/www.scientific.net/amm.505-506.827.

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In our country, the quantity of non-motorized vehicle are huge, non-motorized vehicles lanes set conditions give a great affect on the utilization of non-motorized vehicles lane, therefore it is necessary to study the relationship between the utilization of non-motorized vehicles lane and various factors affecting, and build relationships model. This article mainly collection a large number of situation non-motorized transport data, and build relationship model between non-motorized vehicles lanes utilization and Factors influencing for some non-motorized vehicles lane based on the analysis of the data, and then validate the model. Studies show that: non-motorized vehicles lanes traffic rate and non-motorized lanes utilization has no correlation; non-motorized vehicles lanes width and non-motorized vehicles lanes utilization comply logarithmic correlation model; non-motorized vehicles lanes traffic density and non-motorized vehicles lanes utilization comply linear correlation model.

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5

Zhang, Guoqiang, Qiqi Zhou et Jun Chen. « Exploring Factors Impacting on the Lane Choice of Riders of Non-Motorized Vehicles at Exit Legs of Signalized At-Grade Intersections ». International Journal of Environmental Research and Public Health 18, n^o 12 (11 juin 2021) : 6327. http://dx.doi.org/10.3390/ijerph18126327.

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For most signalized at-grade intersections, exclusive lanes for non-motorized vehicles have been applied to improve the level of service, capacity and safety of both motorized vehicles and non-motorized vehicles. However, because of various factors, riders of non-motorized vehicles have been observed using lanes for motorized vehicles instead of lanes for non-motorized vehicles, which usually negatively influences the performance of signalized intersections and sometimes may cause serious problems such as traffic congestion and accidents. The objective of this paper is to explore factors influencing the lane choice of riders of non-motorized vehicles at exit legs of signalized at-grade intersections and develop a prediction model for riders’ lane choice. Data concerning the lane choice of riders of non-motorized vehicles and other impacting factors were collected at exit legs of four typical signalized at-grade intersections. Applying binary logistic regression, a probability prediction model was developed to explain how various factors influence the lane choice of riders of non-motorized vehicles. The prediction model indicates that female riders of non-motorized vehicles have a higher probability of choosing the lane for non-motorized vehicles than male riders. Compared with riders of non-motorized vehicles powered by electricity, riders of traditional man-powered bicycles are more likely to choose the lane for non-motorized vehicles. Right-turning riders of non-motorized vehicles are more likely to choose the lane for non-motorized vehicles than straight-going riders, who in turn, are more likely to choose the lane for non-motorized vehicles than left-turning riders. Decreasing the volume of non-motorized vehicles, increasing the volume of motorized vehicles, and widening the lane for non-motorized vehicles will increase the probability of the correct choice of lane for non-motorized vehicles. The predictions of the model are in good agreement with the observed facts. The model is meaningful for guidance on the design and management of signalized at-grade intersections.

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Flesch, Aimé, et An Nguyen-Dinh. « Motorized Ultrasonic Scanhead ». Journal of the Acoustical Society of America 129, n^o 3 (2011) : 1674. http://dx.doi.org/10.1121/1.3573362.

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7

Akinkuotu, A. F. « Motorized Spindle Vibration ». Shock and Vibration Digest 28, n^o 3 (1 mai 1996) : 11–20. http://dx.doi.org/10.1177/058310249602800303.

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8

Elliot, Daniel J., et George T. Foster. « Motorized percussion devices ». Journal of the Acoustical Society of America 118, n^o 1 (2005) : 30. http://dx.doi.org/10.1121/1.1999438.

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9

Ma, Da Guo, et Xin Bo Jiang. « Thermal Characters of the Air-Cooled High Speed Motorized Spindle for Wood-Working Machine ». Key Engineering Materials 579-580 (septembre 2013) : 568–72. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.568.

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The structure and composition of the air-cooled high speed motorized spindle for wood-working machine and some features relative to the metal cutting motorized spindle are introduced briefly. Then the main heat sources and heat dissipation mechanism of the air-cooled motorized spindle are thoroughly analyzed, finite element model of the air-cooled motorized spindle is built, the motorized spindles temperature distribution under thermal steady state and the influence of speed are analyzed. The results show that air cooling relative to the water or oil cooling has many advantages and reasonable heat dissipation structure design of air-cooled motorized spindle could meet the requirements of the high-speed motorized spindle for wood-working machine.

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10

Xiong, Dan, Xiao Li Fang, Zhao Zhou, Zhi Liang Liu, Jian Bo Wang et Cao He. « Urban Development Planning in Motorized and Non-Motorized Traffic Integration Studies ». Applied Mechanics and Materials 505-506 (janvier 2014) : 967–71. http://dx.doi.org/10.4028/www.scientific.net/amm.505-506.967.

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By analyzing the current domestic situation of non-motorized traffic and referring to European and other foreign advanced experience, the paper takes comprehensive consideration of time and distance. Division curve model is used to forecast and analyze non-motorized traffic demand. The paper studies and explores the effective combination way of the motorized and non-motorized traffic deeply. Transportation planning and traffic organization mode about the transport way in the CBD, scenic spots are proposed in the paper.

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11

Hatchett, Andrew G., Brian B. Parr, Lianna R. Epstein, Harli R. Eggenberger et Rachel L. Herring. « A Comparison of Energy Expenditure Between Motorized and Non-Motorized Treadmills ». Medicine & ; Science in Sports & ; Exercise 49, n^o 5S (mai 2017) : 925. http://dx.doi.org/10.1249/01.mss.0000519514.12810.bf.

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12

Whyte, Douglas G., Paul J. Tofari, Stuart J. Cormack et Robert B. Edwards. « Metabolic Cost Of Overground, Motorized Treadmill And Non-motorized Treadmill Running ». Medicine & ; Science in Sports & ; Exercise 49, n^o 5S (mai 2017) : 195. http://dx.doi.org/10.1249/01.mss.0000517372.18419.b1.

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Nimal, R. J. Golden Renjith. « Fabrication of Motorized Chain Mechanism Hacksaw ». International Journal of Psychosocial Rehabilitation 23, n^o 4 (20 juillet 2019) : 107–13. http://dx.doi.org/10.37200/ijpr/v23i4/pr190167.

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14

Wang, Junwen, Chuangui Yang, Yangqiu Xia, Qiu Hu, Fei Chen et Kun Du. « Development of comprehensive performance testing technology for motorized spindle ». Advances in Mechanical Engineering 10, n^o 12 (décembre 2018) : 168781401881896. http://dx.doi.org/10.1177/1687814018818963.

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The comprehensive performance test of motorized spindle will contribute to improve the machining quality of machine tool. But existing standards for testing the performance of motorized spindle are limited to test its partial static and dynamic performances. Meantime, most of the researches only focus on the vibration, thermal deformation, and rotary accuracy of motorized spindle. Consequently, how to accurately and comprehensively test the performance of motorized spindle is the key problem. For solving this problem, a comprehensive testing technology is presented in this article. In detail, some principles for establishing a test index system are proposed. And, by synthetically and systematically analyzing the process of structural design, manufacturing and assembly, use, and service, an index system for characterizing the comprehensive performance of motorized spindle is built. Then, some operational test methods are provided to evaluate the selected indexes. Finally, the proposed technology is taken to test a motorized spindle. In brief, the proposed technology will make the performance test of motorized spindle more comprehensive and operational and can provide support for improving the comprehensive performance of the motorized spindle.

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15

Li, Xiaohu, Jinyu Liu, Cui Li, Jun Hong et Dongfeng Wang. « Research on the influence of air-gap eccentricity on the temperature field of a motorized spindle ». Mechanical Sciences 12, n^o 1 (9 février 2021) : 109–22. http://dx.doi.org/10.5194/ms-12-109-2021.

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Abstract. The air-gap state between the stator and rotor is an important indicator to measure the performance of a motorized spindle. It affects the temperature field distribution of the motorized spindle and the machining accuracy of the mechanical parts. Since the accurate thermal model is the basis of the research on the temperature field distribution of the motorized spindle, in this paper, firstly, the mechanical loss, electrical loss and magnetic loss of the motor under different air-gap eccentricities are calculated and the heat-generating power of an angular-contact ball bearing is obtained based on Harries contact theory. Secondly, the thermal model of the motorized spindle is established and the steady-state temperature field of the motorized spindle is simulated by using ANSYS, and the influence of air-gap eccentricity on the temperature field of the motorized spindle is discussed. Finally, the circumferential temperature field distribution of the motorized spindle with the air-gap eccentricity is verified by experiment. The results show that the air-gap eccentricity has a significant influence on the non-uniform temperature field of the motorized spindle.

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16

Jiang, Di Gang, et Yi Zhou Wu. « A Planning Method of Urban Non-Motorized Traffic System — A Case from Hangzhou ». Applied Mechanics and Materials 174-177 (mai 2012) : 2395–98. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.2395.

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By the context of the tightening energy supply, growing environmental crisis and urban traffic congestion in current China, non-motorized traffic system provides new solutions. This paper learns from the ideas of planning and design of non-motorized traffic system in the other cities and explores the planning of Hangzhou non-motorized traffic system by the key control approach of zoning and classification. The studies show that the non-motorized traffic system planning in Hangzhou mainly proceeds from the pedestrian traffic system and non-motorized transportation system guides the traveling public with a concept of green travel. And it will contribute to achieving cities’ sustainable development by planning an efficient non-motorized traffic system.

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17

Lu, Xiao Hong, Zhen Yuan Jia, Zhi Cong Zhang et Xv Jia. « Design of Special Fixture for Micro High Speed Motorized Spindle ». Advanced Materials Research 228-229 (avril 2011) : 66–71. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.66.

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The fixture of motorized spindle significantly affect the vibration of micro high speed CNC milling machine, its performance can directly affect the machining accuracy of the entire micro milling machine. A special fixture of high-speed motorized spindle is designed in the paper and its static characteristics are checked by utilizing ANSYS finite element analysis software. To guarantee the sufficient strength of bolts and the safety of motorized spindle when the motorized spindle runs at high speed, theory analysis method and ANSYS finite element analysis method are used to make the strength check of the fixture. The designed special fixture for high speed motorized spindle plays an important part in the design of high-speed motorized spindle.

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18

Zhang, Ke, Xiang Nan Ma, Li Xiu Zhang, Wen Da Yu et Yu Hou Wu. « Finite Element Analysis about the Influence that High-Speed Motorized Spindle Spindle System Material has on its Temperature Field ». Advanced Materials Research 712-715 (juin 2013) : 1209–12. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1209.

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The article has analyzed the changes of temperature of different materials of the spindle, and considered 170SD30 Ceramic Motorized Spindle and the same model Metal Motorized Spindle as the research objects, analyzed the inside heat source and heat transfer mechanism of the high-speed motorized spindle; used finite element software to set up the model of the motorized spindle, and did simulation and analysis. Verified by simulation, heat transfer rate of ceramic materials is slower than the metallic materials, in actual operation of the process, due to different materials have different heat transfer rate, so the temperature distribution of the different materials of motorized spindle are different. This conclusion provides the basis to solve motorized spindle temperature field distribution.

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19

Liu, Yan, Chuanyun Fu et Wei Wang. « Modeling duration of overtaking between non-motorized vehicles : A nonparametric survival analysis based approach ». PLOS ONE 16, n^o 1 (29 janvier 2021) : e0244883. http://dx.doi.org/10.1371/journal.pone.0244883.

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The use of non-motorized vehicles in urban city has improved the convenience of short-distance travel and reduced traffic pollution. However, the overtaking behaviour of non-motorized vehicles impacts traffic safety and efficiency significantly. The objective of this study is to model the durations of overtaking behaviour in the non-motorized vehicle exclusive lane. A total of 3010 overtaking events of non-motorized vehicles were extracted from two locations in Chengdu, China. The nonparametric survival analysis was conducted to model the overtaking duration of non-motorized vehicles. The categorical variables that significantly influence the overtaking duration were examined by the Log-rank test. The results show that the overtaking durations of female riders is longer than that of male riders. It takes longer for electrical bikes to complete overtaking than conventional bikes. When the non-motorized vehicle is under the load state (i.e. passengers or goods on the non-motorized vehicle), the overtaking behaviour takes more time than the un-load state. Moreover, it takes less time to overtake the non-motorized vehicle with load than to overtake the one without load. When there is a wrong-way driving phenomenon or under higher traffic volume, the duration is longer compared to the normal traffic and lower traffic volume conditions. The findings of this study attempt to provide a more profound understanding of non-motorized vehicles overtaking behaviour under different traffic conditions and give insights to the safety research of non-motorized vehicles.

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20

Opsenica, Milorad. « Overtaking military motorized column ». Vojnotehnicki glasnik 45, n^o 1 (1997) : 721–27. http://dx.doi.org/10.5937/vojtehg9706721o.

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21

Dove, Alan W. « Apical transport gets motorized ». Journal of Cell Biology 155, n^o 1 (1 octobre 2001) : 11. http://dx.doi.org/10.1083/jcb1551iti3.

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22

Kaminsky, P. G., L. W. Rupp et B. Yurke. « Cryogenic motorized waveguide switch ». Review of Scientific Instruments 58, n^o 5 (mai 1987) : 894–95. http://dx.doi.org/10.1063/1.1139599.

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23

Gudjonsdottir, Bjorg, et Vick Stemmons Mercer. « A Motorized Dynamic Stander ». Pediatric Physical Therapy 14, n^o 1 (2002) : 49–51. http://dx.doi.org/10.1097/00001577-200204000-00008.

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Gudjonsdottir, Bjorg, et Vick Stemmons Mercer. « A Motorized Dynamic Stander ». Pediatric Physical Therapy 14, n^o 1 (2002) : 49–51. http://dx.doi.org/10.1097/00001577-200214010-00008.

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25

Kelley, Rory R. « Motorized string tuning apparatus ». Journal of the Acoustical Society of America 85, n^o 5 (mai 1989) : 2247. http://dx.doi.org/10.1121/1.397810.

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26

Phoenix Inspection Systems Ltd. « Motorized pipe weld scanner ». NDT & ; E International 25, n^o 2 (1992) : 110. http://dx.doi.org/10.1016/0963-8695(92)90630-y.

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27

Zhang, Li Xiu, Yu Hou Wu et Li Yan Wang. « Analysis on the Influence of Vibration Performance of Air-Gap of Ceramic Motorized Spindle ». Advanced Materials Research 335-336 (septembre 2011) : 547–51. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.547.

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Engineering ceramic is the ideal material for high-speed and high precision motorized spindle due to perfect characteristics of light weight, wear resistance, high temperature, high strength, and so on. The air-gap is changed due to the influence from various factors not only the tolerance of the manufacture and assembly of motorized spindle but also different working condition. The change of air-gap impacts on vibration performance of motorized spindle. The effects of rotating speed and air-gap between the rotator and stator on these characteristic parameters of the motorized spindle are analyzed. This paper analyses the effect change of air-gap on vibration performance of motorized spindle by the simulation analysis and experimental. The results show that vibration increase with the decrease of air-gap. Meanwhile, electromagnetic vibration increase with the increase of eccentricity of motorized spindle. These results are very helpful to the structure optimization and application of the ceramic motorized spindle.

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Zhang, Ke, Zinan Wang, Xiaotian Bai, Huaitao Shi et Songhua Li. « Research on Ceramic Spindle Loss Based on Ceramic Reverse Magnetic Effect ». Mathematical Problems in Engineering 2020 (20 mars 2020) : 1–14. http://dx.doi.org/10.1155/2020/7418719.

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Ceramic motorized spindle is a multifield, nonlinear, and strong coupling system. The present model ignores the reverse magnetic effect and has a poor accuracy on the loss of the spindle system. In the paper, Park transformation was used to establish the electromagnetic physical model of ceramic motorized spindle. By combining with the Jiles–Atherton theory, an eccentric magnetization model of a ceramic motorized spindle considering reverse magnetic properties was established. Energy consumption parameters were calculated under various working conditions. The influence of ceramic reverse magnetic characteristics on the motorized spindle loss was analyzed and verified by experiments. The results show that the simulation of the ceramic motorized spindle loss model is in good agreement with the experimental results. Compared with the experimental results, the average loss error was 2.1%. Due to the reverse magnetic characteristics, the application of ceramic motorized spindle can help reduce the system loss. The ceramic motorized spindle model provides a theoretical basis for the development of ceramic spindle energy loss and efficiency.

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Wang, Zhan, et Wei Tu. « Online Dynamic Balance Detection Method of High Speed Motorized Spindle Based on LabVIEW ». Applied Mechanics and Materials 868 (juillet 2017) : 369–74. http://dx.doi.org/10.4028/www.scientific.net/amm.868.369.

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Aiming at the dynamic unbalance problem of high speed motorized spindle, an online dynamic balance detection method based on Fourier transform, polynomial curve fitting and Hooke's law is proposed, at the same time, based on virtual instrument LabVIEW software platform, programming deal with the vibration spectrum image of the motorized spindle. Combined with the detection method, output signal of the size, displacement and vector direction of unbalance force of the motorized spindle are obtained, the output signal would be transmit to dynamic balancing device to complete regulation of high speed motorized spindle online dynamic balance and achieve the real-time monitoring, analysis and timely adjustment of dynamic balance of high speed motorized spindle by using the programming of virtual instrument. We verified detection method by the experiment of online dynamic balance adjustment of the motorized spindle. Detection method of dynamic balance of motorized spindle based on LabVIEW can intuitively test vibration characteristics, the accurate detection of online dynamic balance is helpful to improve the rotation precision of the high speed spindle and realize high quality parts processing.Key words: Motorized spindle; the dynamic balance; Online detection; LabVIEW

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30

Dai, Ye, Wen-Qiang Wei, Xue-Liang Zhang et Yun-Shan Qi. « Recent Patents on the Structure of High-Speed Motorized Spindle ». Recent Patents on Mechanical Engineering 12, n^o 2 (29 juillet 2019) : 125–37. http://dx.doi.org/10.2174/2212797612666190319154640.

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Background: As one of the core components of high-speed CNC machine tool, high-speed motorized spindle is the core functional component of high precision CNC machine tool, which has become the key research and development object of the world. Objective: By comparing and discussing the patents of high-speed motorized spindle, some valuable conclusions have been drawn to predict the future research and development of high-speed motorized spindle. Methods: By analyzing the characteristics of high-speed motorized spindle structure, the influence of high-speed motorized spindle on high-speed machining technology was explicated. Combining with the key technology of high-speed motorized spindle, the patents related to high-speed motorized spindle structure were used for investigation. Results: With the rapid development of high-speed cutting and numerical control technology and the need of practical application, the requirement for high-speed spindle performance has increased. Motorized spindle technology has the characteristics of high speed, high strength, high power, high torque and low speed, high precision, high reliability and long life, offering diversified bearing and lubrication cooling methods and serving as an intelligent system. Conclusion: The different levels of improvement and renovation of the structure with high-speed motorized spindle, by adding lubrication and cooling device to the spindle have improve the performance of spindle, addressing the loopholes in the technology and making it more practical.

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Butts, N. K., L. Lawrence, K. Weiland, J. P. Porcari et H. LePage. « ENERGY COST DURING SIMULATED SKIING, MOTORIZED TREADMILL AND NON-MOTORIZED TREADMILL EXERCISE. » Medicine & ; Science in Sports & ; Exercise 27, Supplement (mai 1995) : S86. http://dx.doi.org/10.1249/00005768-199505001-00487.

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Sun, Yu Xin, Ling Ding, Tao Shi et Xian Xing Liu. « Finite Element Analysis and Dynamics Charateristic Study for High-Speed Magnetic Suspension Motorized Spindle of CNC Machine Tools ». Advanced Materials Research 317-319 (août 2011) : 595–99. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.595.

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According to magnetic suspension motorized spindle system, high speed motorized spindle system based on bearingless induction motor is presented in this paper. The prototype of high speed motorized spindle system with bearingless induction motor is studied and analyzed by using finite element analysis software Ansoft/Maxwell and Riccati transfer matrix method, and compared with high speed motorized spindle system supported by Active Magnetic Bearing (AMB). The results show that high speed motorized spindle system with bearingless induction motor has distinct advantage of simple and compact structure, which is easier to realize high speed and extra-high speed operation.

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Wee, Veronika Myran, Erna Von Heimburg et Roland Van den Tillaar. « Comparison of perceptual and physiological variables of running on a track, motorized treadmill, and non-motorized curved treadmill at increasing velocity ». Acta Kinesiologiae Universitatis Tartuensis 22 (19 décembre 2016) : 20. http://dx.doi.org/10.12697/akut.2016.22.02.

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The aim of this study was to compare perceptual and physiological variables between running on three different modalities — an indoor athletics track, a motorized treadmill, and a non-motorized curved treadmill — for 1000 m at three different velocities. Ten male athletes (age 24±3 years, body mass 69.8±6.91 kg, height 1.80±0.06 m, VO2peak 69.0±6.70 ml/kg/ min) conducted three 1000 m laps at increasing velocity on three different running modalities. The athletes had a 3-minute recovery between each lap, where the rate of perceived exertion (RPE) was registered and the blood lactate concentration and heart rate were measured. Oxygen uptake was measured using a portable metabolic analyser. The physiological (oxygen uptake, heart rate, and blood lactate concentration) and perceptual (RPE) variables were higher when running on a non-motorized curved treadmill compared with running on the track or a motorized treadmill. No differences were found between running on a motorized treadmill and the track except for the RPE, which was lower when running on the track compared with the motorized treadmill. Running on a non-motorized curved treadmill at three different velocities results in a higher oxygen uptake (37%) and heart rate (22%) and is subjectively much harder than running on a track or a motorized treadmill at the same velocities. The difference is around 4 km/h when comparing the physiological and perceptual responses. Thus, when performing training sessions on a non-motorized curved treadmill, subjects should subtract 4 km/h from their regular pace on a track or motorized treadmill to get the same response considering oxygen uptake, heart rate, RPE and blood lactate concentration.

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Zhang, Li Xiu, et Yu Hou Wu. « Vibration and Noise Monitoring of Ceramic Motorized Spindles ». Advanced Materials Research 291-294 (juillet 2011) : 2076–80. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.2076.

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High speed machining (HSM) technology is used in a broad range of applications to machine ferrous metals and nonmetallic material. The motorized spindle is one of the major elements to keep the machine running at high productivity. In recently years, the requirement of rotational speed and rigidity of motorized spindle is getting higher and higher in order to satisfy the high speed processing. Engineering ceramic is the ideal material for high-speed and high precision electrical spindle due to perfect characteristics of light weight, wear resistance, high temperature, high strength, and so on. So a ceramic motorized spindle is designed for higher speed and rigidity. The shaft and bearing of the motorized spindle are made from ceramic material and other parts are made from metal. Rated power of this electrical spindle is 15Kw; its torque is 14Nm and revolving speed is up to 30,000 rpm as maximum. Motorized spindle is a typical mechatronics product and its dynamic property is very important. The signal of vibration and noise of motorized spindle may display its running status, so the vibration and noise of motorized spindle is an important index in the dynamic performance. This paper monitors the vibration and noise of ceramic motorized spindles using spectral analysis techniques. The effects of rotating speed and lubrication condition on vibration and noise of the ceramic electrical spindle are analyzed. These results are very helpful to the structure optimization and application of the ceramic motorized spindle.

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Yu, Dong Man, Yan Hui Hu, Di Wang et Xiao Jing Li. « Thermal Analysis Based on Finite Element Analysis for Motorized Spindle ». Applied Mechanics and Materials 556-562 (mai 2014) : 1170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1170.

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High-speed motorized spindle is a key device of modern industry and has been widely used in numerical control machine. Temperature distribution, speed control loading characteristics, precision maintenance, liberation intensity and circumgyration error are not only the key demand of motorized spindle's capability but also an important index to evaluate it's performance. Therefore, this study has detailed described the main structure of motorized spindle. The basic structure and working principal was introduced, and then demonstrated a series of models and specifications of motorized spindle. The finite element model of high-speed motorized spindle was built up and carried out thermal analysis to study the heat generation and heat transfer. With the help of ANSYS finite element software, the temperature field distribution and the temperature rise condition for motorized spindle were analyzed. The result shows that the front bearing has a higher temperature than that of back bearing. The maximum temperature of inner ring is bigger than that of outer ring. The results contribute to selection of appropriate bearing for motorized spindle system.

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Yang, Min, Di Wang, Pei Xin Qu et Xiao Jing Li. « A Theoretical Study for Temperature Condition of Motorized Spindle System ». Applied Mechanics and Materials 155-156 (février 2012) : 273–77. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.273.

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Super precise is one of the primary requirement of the high-speed motorized spindle. Temperature distribution, speed control loading characteristics, precision maintenance, liberation intensity and circumgyration error are not only the key demand of motorized spindle's capability but also an important index to evaluate it's performance. The paper has detailed described the main structure of motorized spindle. A 3D motorized spindle model was established and carried out thermal analysis to study the heat generation and heat transfer. Under the ANSYS finite element software circumstance, the temperature field distribution and the temperature rise condition for motorized spindle are researched. From the result, we can find the front bearing has a higher temperature than that of back bearing. The maximum temperature of inner ring is bigger than that of outer ring. The results contribute to selection of appropriate bearing for motorized spindle system.

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Deng, Xiaolei, Xinghui Zhang, Mucheng Zhang, Yibo Zhou, Huan Lin et Jianchen Wang. « Thermal Characteristics Analysis for Motorized Spindle System of CNC Machining Center ». MATEC Web of Conferences 257 (2019) : 02003. http://dx.doi.org/10.1051/matecconf/201925702003.

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Based on the comprehensive analysis of the heat sources of the motorized spindle system, the thermal loads, including the heat generation of bearing friction and the electromagnetic loss of the built-in motor, are carried out for a machining center motorized spindle system. And then, the convective heat transfer coefficients of the whole spindle system are analyzed. The thermal characteristics of the motorized spindle system are calculated by finite element analysis. The steady state temperature field distribution of the motorized spindle is obtained. It provides some references for improving the thermal characteristics of the motorized spindle and reducing the difficulty of thermal error compensation.

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Xi, Xue Song, Bo Xuan Gu, Ming Yin et Xue Song Wang. « The Construction of Non-Motorized Transportation Network Based on Residents' Preference in Urban Central Area ». Applied Mechanics and Materials 357-360 (août 2013) : 1868–81. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1868.

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To deal with the serious impact on urban traffic, society, ecological environment and energy system by the aggregated motorization in cities, both China and foreign countries have gradually come up with a series of policies and initiatives targeting at the non-motorized traffic by cyclists and pedestrians. Under such a background, the research studies four sub-districts of Tuanjie hu, Hujialou, Liulitun and Balizhuang at the central area of Chaoyang District, Beijing, and tries to find the interrelation between the preferences of non-motorized agents in densely populated urban central area and the construction of non-motorized transportation network. By discussing the non-motorized travel routes, road patterns and facility layout according to various needs of the target group, the research aims to deal with the construction of non-motorized transportation system in the densely populated central area in Beijing. Through questionnaire and interview, the research conducts an in-depth survey on residents travel purposes, behavioral regularities and users assessment for the current non-motorized routes, and acquires an understanding about their preferences on choice of roads due to different travel purposes, problems from using current non-motorized routes and thereby their preferred road patterns, and the preferred facility layout that meet local residents behavioral regularities. By simulating the optimization of two types of non-motorized routes for commute and recreation with the Cost Distance Module, the research constructs three types of non-motorized routes: comprehensive, commute and recreation, with a total length of 65.8km. The research also reconstructs the road patterns for urban expressway, major arterial, minor arterial and connector on the road section for commute and recreation, adding green belts and low road fence to segment non-motorized routes. Meanwhile, the research establishes a three-tier NMT facility service center system which incorporates bicycle service (ranging from bike renting, parking and maintenance to vehicle shift), NMT signs, informational signs, vendor booths, public bathrooms, benches, and trash bins. Thus an integral non-motorized traffic network at the urban central area of Beijing is built up.

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Wang, Zhan, Wenzhi He, Siyuan Du et Zhe Yuan. « Study on the Unbalanced Fault Dynamic Characteristics of Eccentric Motorized Spindle considering the Effect of Magnetic Pull ». Shock and Vibration 2021 (24 avril 2021) : 1–12. http://dx.doi.org/10.1155/2021/5536853.

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Unbalanced fault is the most common fault of high-speed motorized spindle, which is the main factor affecting the machining accuracy of high-speed spindle. Due to the unbalanced magnetic pull produced by the air gap eccentricity of the stator and rotor, the unbalanced vibration of the motorized spindle will be further aggravated. In order to explore the dynamic behavior and motion law of the unbalanced fault motorized spindle under the eccentric state, a dynamic model of the unbalanced fault of the high-speed motorized spindle considering the unbalanced magnetic pull was established. Taking the eccentric motorized spindle customized by the research group as the research object, the dynamic model is established, simulated, and analyzed, and the response change law of motorized spindle under the effect of different speed, unbalance, and air gap is obtained. The simulation results show that the unbalanced magnetic pull caused by static eccentricity will increase the unbalanced vibration of motorized spindle, and the unbalanced vibration will also increase with the increase of static eccentricity. The vibration caused by unbalanced magnetic pull does not increase with the increase of rotating speed. In frequency-domain analysis, when there is unbalanced magnetic pull, the peak appears at 0 Hz, and the amplitude of fundamental frequency vibration will increase with the increase of eccentricity. The experimental results show that the greater the eccentricity is, the greater the unbalance vibration of the motorized spindle is. The experimental results are consistent with the simulation results, which further verify the accuracy of the model. The research results lay a theoretical basis for fault analysis and diagnosis of coupling fault motorized spindle.

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Meng, Jie. « The Vibration Analysis and Modal Experimental Study of High Speed Motorized Spindle ». Advanced Materials Research 291-294 (juillet 2011) : 3078–82. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.3078.

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Vibration testing and modal experiment under the different speed are carried out to the high speed motorized spindle whose maximum speed is 60 000 rpm. Time domain waveform and spectrum of motorized spindle’s radial vibration acceleration are obtained under the unload state. Through calculating and analyzing, the vibration velocity and the testing point which generates the maximum vibration velocity are found out. Then motorized spindle is validated whether it accords with the requirements of high-precision manufacture. And the correctness of the vibration testing method is also verified. Primary reasons of the motorized spindle’s vibration are put forward. The first five steps natural frequencies of motorized spindle test-bed are gained by appropriate ways to checkout if the test-bed in the resonance region.

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He, Yu An, et Yan Ming He. « Failure Mode Analysis for High-Speed Motorized Spindle of NC Machine Tools ». Applied Mechanics and Materials 623 (août 2014) : 85–89. http://dx.doi.org/10.4028/www.scientific.net/amm.623.85.

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High-speed motorized spindle of NC machine tools is the core component for high speed machining. Production efficiency, machining accuracy, processing quality are greatly improved, and production cost is reduced by high speed machining. The paper describes the common failure modes of high-speed motorized spindle. By the fault tree analysis method, failure modes of motorized spindle are modeled, and the main fault reasons of motorized spindle for NC machine tools are gotten. Qualitative analysis is performed for the fault tree by the mean of the structure function. At the end of this paper, the minimal cut sets which are the main sets of failure modes are all obtained. It has laid a good foundation for further study of quantitative analysis of motorized spindle failure modes.

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Ma, Ping, Biao Zhou et Hai Peng Li. « Finite Element Analysis on Thermal Characteristics of Lathe Motorized Spindle ». Advanced Materials Research 311-313 (août 2011) : 2434–39. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.2434.

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Abstract．High-speed motorized spindle is a promising technology widely used in high speed machining．The lathe motorized spindle is the key component of the high speed NC lathe and the thermal characteristics of the lathe motorized spindle is one of the major factors influencing the performance of the machine tools．In order to improve the accuracy and reliability of the high speed NC lathe，the thermal characteristic of the high speed NC motorized spindle has been studied in this paper．Firstly，the structure feature of the spindle has been introduced and two major internal heat sources of motorized spindle have been investigated．Secondly，the heat transfer coefficients of the major components of the lathe spindle have been conducted．Then，the 2D temperature field model has been developed with finite element method．Based on it, the temperature field and temperature rises of the spindle have been simulated and the reasonability of temperature distribution of the spindle unit has also been discussed．The research results provide the reference to evaluate of the thermal behavior of the high speed NC motorized spindle．

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Kalayci, Ibrahim, et Sermet Ogutcu. « A novel approach for detail surveys by the motorized GPSSIT concept in residentials areas and its application ». Boletim de Ciências Geodésicas 20, n^o 1 (mars 2014) : 70–83. http://dx.doi.org/10.1590/s1982-21702014000100005.

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This paper introduces the usage and reliability of Motorized GPSSIT technique which is a novel approach for surveying. It reviews the advantages of Motorized GPSSIT concept and also considers to provide GNSS accuracy in the process of surveying especially for the cases which cannot be surveyed directly by the satellite navigation systems (GPS-GNSS), such as closely packed residential areas, tall buildings, trees, etc., and also places which GNSS receivers cannot be work efficiently due to signal interferences. In this technique, all the survey instruments are installed on a bed of a pick-up truck whereas in present techniques they are installed on the ground, therefore it is called Motorized GPSSIT. Study area was chosen within the housing area of our campus. In this area, classical surveying, GPSSIT and Motorized GPSSIT were performed to collect data for comparison and for the analysis of this technique's usability and reliability. Stop and Go and RTK surveying techniques were performed with GPSSIT and Motorized GPSSIT concepts. It is shown that the Motorized GPSSIT technique is applicable as other present techniques in terms of accuracy and reliability.

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de Freitas, Verônica, et Luzenira Alves Brasileiro. « VIABILIDADE DOS MODOS NÃO MOTORIZADOS ». Revista Sinergia 20, n^o 4 (31 décembre 2000) : 303–10. http://dx.doi.org/10.33780/issn.2177-451x.2019.v20.n4.p303-310.

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Traffic is getting increasingly chaotic and the jams are getting more and more frequent in such way that people's lives in cities are being affected with reduced quality of life due to the time spent to come and go for everyday tasks, therefore the importance of studying traffic demands for installation of cycle routes in order to contribute to the reduce the usage of motorized vehicles. This case study was held in the city of Presidente Epitácio-SP, applying 1763 questionnaires which were applied in a total of 41.511 inhabitants. The number of questionnaires that were applied were defined by the statistical method Simple Random Sampling (AAS). These data from the questionnaires resulted in matrices source destination, S/D, via Google Maps software, which allowed the research to obtain the main mode used, and the greater flow routes. Non-motorized modes predominated in results in 50%, thus clearly showing the necessity for cycle lanes in the aforementioned town.

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Lu, Yong, Sheng Dong Gao et Zhao Peng Hao. « Study on Steady-State Temperature Field and Thermal Deformation for Permanent Magnet Synchronous Motorized Spindle ». Advanced Materials Research 305 (juillet 2011) : 340–43. http://dx.doi.org/10.4028/www.scientific.net/amr.305.340.

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Motorized spindle thermal deformation is a major factor affecting the accuracy of high-speed machine tool, previous studies have focused on asynchronous motorized spindle, however, in this paper, permanent magnet synchronous motorized spindle is the research object. At first, the finite element model of thermal characteristics of motorized spindle is established base on its thermal characteristics analysis. The second, study on the distribution of the spindle steady-state temperature field, effect of spindle speed and bearing lubrication on thermal deformation of spindle. The results provide a strong theoretical basis for the design and use of spindle.

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Cui, Yi, Hao Lin Li, Hai Tao Huang et Xiao Wei Xin. « The Thermal Structure Coupling Analysis of Hydrostatic Motorized Spindle in Ultra-Precision Grinding Machine ». Applied Mechanics and Materials 607 (juillet 2014) : 427–30. http://dx.doi.org/10.4028/www.scientific.net/amm.607.427.

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For the hard and brittle materials like optical glasses, ultra-precision grinding machine is primarily used, which can generate parts with high surface finish, high form accuracy and surface integrity. Motorized spindle is an inevitable choice of ultra-precision machine, but it has a prominent heat problem for its specific configuration of build-in motor. The paper does some research about motorized spindle thermal property. The heat resources and heat transferring ways are analyzed. The temperature distribution and deformation distribution of motorized spindle system are calculated through thermal structure coupling finite element analysis. The analysis results can provide warranty for motorized spindle design.

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Jia, Weitao, Feng Gao, Yan Li, Wenwu Wu et Zhongwei Li. « Nonlinear Dynamic Analysis and Chaos Prediction of Grinding Motorized Spindle System ». Shock and Vibration 2019 (22 septembre 2019) : 1–10. http://dx.doi.org/10.1155/2019/9643124.

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The paper determines the impact factors of dynamics of a motorized spindle rotor system due to high speed: centrifugal force and bearing stiffness softening. A nonlinear dynamic model of the grinding motorized spindle system considering the above impact factors is constructed. Through system simulation including phase portraits and Poincaré map, the periodic behavior and chaotic behavior of the nonlinear grinding motorized spindle system are revealed. The threshold curve of chaos motion is obtained through the Melnikov method. The conclusion can provide a theoretical basis for researching deeply the dynamic behaviors of the grinding motorized spindle system.

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Assi, Khaled, Uneb Gazder, Ibrahim Al-Sghan, Imran Reza et Abdullah Almubarak. « A Nested Ensemble Approach with ANNs to Investigate the Effect of Socioeconomic Attributes on Active Commuting of University Students ». International Journal of Environmental Research and Public Health 17, n^o 10 (19 mai 2020) : 3549. http://dx.doi.org/10.3390/ijerph17103549.

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Analysis of travel mode choice is vital in policymaking and transportation planning to comprehend and forecast travel demands. Universities resemble major trip attraction hubs, with many students and faculty members living on campus or nearby. This study aims to investigate the effects of socioeconomic characteristics on the travel mode choice of university students. A nested ensemble approach with artificial neural networks (ANNs) was used to model the mode choice behavior. It was found that students generally prefer motorized modes (bus and car). A more detailed analysis revealed that teenage students (aged 17–19 years) had an approximately equal probability of selecting motorized and non-motorized modes. Graduate students revealed a higher tendency to select motorized modes compared with other students. The findings of this study demonstrate the need to promote non-motorized modes of transport among students, which is possible by providing favorable infrastructure for these modes.

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Wu, Teng Qing, Heng Liu, Min Qing Jing et Hong Wei Fan. « Study on the Thermal Characteristics of a Motorized Spindle Unit ». Advanced Materials Research 479-481 (février 2012) : 2546–50. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.2546.

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Heat generation and heat transfer of motorized spindle unit are studied in this paper, including heat generation of built-in motor and rolling bearings, heat conduction, convection and radiation between spindle components. By modeling a FEM model of a high performance motorized grinding spindle, thermal characteristics simulation of the spindle unit is completed. The thermal characteristics under different spindle speeds, different cooling water flow rates and different forced air flow rates are simulated. The numerical results show that spindle speed and cooling water flow rate have significant influences on thermal characteristics of motorized spindle unit. These results are useful to guide the design and verification of motorized spindle unit.

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Graf, Ben K., et William G. Clancy. « Motorized arthroscopic instruments : A review ». Arthroscopy : The Journal of Arthroscopic & ; Related Surgery 3, n^o 3 (janvier 1987) : 199–204. http://dx.doi.org/10.1016/s0749-8063(87)80066-x.

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