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作者： Wang, Fengtao Jing, Minqing Fan, Hongwei Wei, Yaobing Zhao, Yang Liu, Heng State Key Lab for Strength and Vibration of Mechanical Structures Xi'An Jiaotong University Xi'an China Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'An Jiaotong University No. 28Xianning West Road Xi'an Shaanxi710049 China School of Mechanical and Electrical Engineering Lanzhou University of Technology Lanzhou China School of Mechanical Engineering Xi'An University of Science and Technology Xi'an China

As an important structure parameter, contact angle is also a judgement factor for the working performance of ball bearings. However, under some conditions, the ball may roll over the raceway shoulder, and contact angle is not enough for estimating this phenomenon. Thus, edge angle and edge distance are proposed as compensatory judgement factors in the current study. A six-degree dynamic model with time-varying contact stiffness was developed for investigating effects of initial contact angle, raceway groove curvature factors, number of balls, axial load, shaft speed, friction coefficient and raceway misalignment on contact angle, contact stiffness, edge angle and edge distance. Inapposite initial contact angle may make the ball roller over the raceway shoulder, inner raceway misalignment have significant influences on the stable motion of ball bearings, and more harmonics frequencies about contact angle appear. Comparison of contact angle from presented model with Jones-Harris model under axial load shows reasonable qualitative agreement. © IMechE 2016.

关键词： Contact angle

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Rücktitelbild: ESAs Kometen-Mission Rosetta – Neu-Analyse der Daten des COSAC Massenspektrometers (Angew. Chem. 29/2022)

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Angewandte Chemie 2022年第29期134卷

作者： Guillaume Leseigneur Dr. Jan Hendrik Bredehöft Dr. Thomas Gautier Dr. Chaitanya Giri Dr. Harald Krüger Prof. Dr. Alexandra J. MacDermott Prof. Dr. Uwe J. Meierhenrich Dr. Guillermo M. Muñoz Caro Prof. Dr. François Raulin Dr. Andrew Steele Dr. Harald Steininger Prof. Dr. Cyril Szopa Prof. Dr. Wolfram Thiemann Dr. Stephan Ulamec Dr. Fred Goesmann Université Côte d'Azur CNRS UMR 7272 Institut de Chimie de Nice 28 Avenue Valrose 06108 Nice Frankreich University of Bremen Department 02 Biology/Chemistry Institute for Applied and Physical Chemistry Leobener Str.5 28359 Bremen Deutschland Laboratoire Atmosphère Milieux Observations Spatiales (LATMOS) LATMOS/IPSL UVSQ Université Paris-Saclay Sorbonne Université CNRS 11 Bd d'Alembert 78280 Guyancourt Frankreich LESIA Observatoire de Paris Université PSL CNRS Sorbonne Université Université de Paris 5 place Jules Janssen 92195 Meudon Frankreich Research and Information System for Developing Countries India Habitat Centre Lodhi Road New Delhi 110 003 Indien Earth-Life Science Institute Tokyo Institute of Technology 2-12-1-IE-1 Ookayama Meguro-ku Tokyo 152-8550 Japan Max Planck Institute for Solar System Research Justus von Liebig Weg 3 37077 Göttingen Deutschland University of Houston-Clear Lake 2700 Bay Area Boulevard Houston TX 77058 USA Centro de Astrobiología (CSIC-INTA) Ctra. de Ajalvir km 4 Torrejón de Ardoz 28850 Madrid Spanien Univ Paris Est Créteil and Université de Paris CNRS LISA 94010 Créteil Frankreich Geophysical Laboratory Carnegie Institution of Washington Washington DC USA Design Assurance Department OHB System AG Universitätsallee 27 28359 Bremen Deutschland University of Bremen Institute for Applied and Physical Chemistry Leobener Strasse NW2 28359 Bremen Deutschland German Aerospace Center (DLR) Space Operations and Astronaut Training Linder Höhe 51147 Köln Deutschland

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Back Cover: ESA's Cometary Mission Rosetta—Re-Characterization of the COSAC Mass Spectrometry Results (Angew. Chem. Int. Ed. 29/2022)

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Angewandte Chemie International Edition 2022年第29期61卷

作者： Guillaume Leseigneur Dr. Jan Hendrik Bredehöft Dr. Thomas Gautier Dr. Chaitanya Giri Dr. Harald Krüger Prof. Dr. Alexandra J. MacDermott Prof. Dr. Uwe J. Meierhenrich Dr. Guillermo M. Muñoz Caro Prof. Dr. François Raulin Dr. Andrew Steele Dr. Harald Steininger Prof. Dr. Cyril Szopa Prof. Dr. Wolfram Thiemann Dr. Stephan Ulamec Dr. Fred Goesmann Université Côte d'Azur CNRS UMR 7272 Institut de Chimie de Nice 28 Avenue Valrose 06108 Nice France University of Bremen Department 02 Biology/Chemistry Institute for Applied and Physical Chemistry Leobener Str. 5 28359 Bremen Germany Laboratoire Atmosphère Milieux Observations Spatiales (LATMOS) LATMOS/IPSL UVSQ Université Paris-Saclay Sorbonne Université CNRS 11 Bd d'Alembert 78280 Guyancourt France LESIA Observatoire de Paris Université PSL CNRS Sorbonne Université Université de Paris 5 place Jules Janssen 92195 Meudon France Research and Information System for Developing Countries India Habitat Centre Lodhi Road New Delhi 110 003 India Earth-Life Science Institute Tokyo Institute of Technology 2-12-1-IE-1 Ookayama Meguro-ku Tokyo 152-8550 Japan Max Planck Institute for Solar System Research Justus von Liebig Weg 3 37077 Göttingen Germany University of Houston-Clear Lake 2700 Bay Area Boulevard Houston TX 77058 USA Centro de Astrobiología (CSIC-INTA) Ctra. de Ajalvir km 4 Torrejón de Ardoz 28850 Madrid Spain Univ Paris Est Créteil and Université de Paris CNRS LISA F-94010 Créteil France Geophysical Laboratory Carnegie Institution of Washington Washington DC USA Design Assurance Department OHB System AG Universitätsallee 27 28359 Bremen Germany University of Bremen Institute for Applied and Physical Chemistry Leobener Strasse NW2 28359 Bremen Germany German Aerospace Center (DLR) Space Operations and Astronaut Training Linder Höhe 51147 Cologne Germany

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ESAs Kometen-Mission Rosetta – Neu-Analyse der Daten des COSAC Massenspektrometers

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Angewandte Chemie 2022年第29期134卷

Es wird davon ausgegangen, dass das älteste weitgehend unveränderte Material aus der Frühphase des Sonnensystems in Form von Eis und Staub in Kometen vorliegt. Die ESA-Mission Rosetta trug daher mit Philae eine Landeeinheit, die die Zusammensetzung des Nukleus von Komet 67P/Churyumov-Gerassimenko in situ untersuchen sollte. Fünfundzwanzig Minuten nach dem ersten Bodenkontakt Philaes im November 2014 nahm das COSAC Flugzeit-Massenspektrometer ein Spektrum der Gasphase des Kometen auf. Eine erneute Analyse dieses Spektrums mittels non-negative least-squares Fitting und einer Monte-Carlo Simulation ergibt neue Erkenntnisse über die chemische Zusammensetzung des Kometen 67P. Insgesamt 12 organische Moleküle, von denen 9 bereits in der ersten Analyse der Daten identifiziert wurden, zeigen eine hohe statistische Wahrscheinlichkeit für eine Präsenz im Eis des Kometen. Diese flüchtigen organischen Verbindungen mit zum Teil hoher Konzentration stellen die ersten molekularen Ingredienzien des frühen Sonnensystems dar.

关键词： Analytische Methoden Kometen Massenspektrometrie Philae Rosetta

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Artificial Thermal Sensation: Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality (Adv. Funct. Mater. 29/2020)

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Advanced Functional Materials 2020年第29期30卷

作者： Jinwoo Lee Heayoun Sul Wonha Lee Kyung Rok Pyun Inho Ha Dongkwan Kim Hyojoon Park Hyeonjin Eom Yeosang Yoon Jinwook Jung Dongjun Lee Seung Hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Korea Interactive and Networked Robotics Laboratory Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Korea Thermochemical Energy System R&D Group Korea Institute of Industrial Technology 89 Yangdaegiro‐gil Ipjang‐myeon Seobuk‐ku Cheonan‐si Chungcheongnam‐do 31056 Korea Institute of Advanced Machinery and Design (SNU‐IAMD)/Institute of Engineering Research Seoul National University Gwanak‐ro Gwanak‐gu Seoul 08826 Korea

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Research on Rotational Accuracy of Cylindrical Roller Bearings

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Procedia CIRP 2017年 62卷 380-385页

作者： Yu Yongjian Chen Guoding Li Jishun Xue Yujun School of Mechanical Engineering Northwestern Polytechnical University Xi’an 710072 China Henan Key Laboratory for Machinery Design and Transmission System Luoyang 471003 China School of Mechanical Engineering Henan University of Science and Technology Luoyang 471003 China

To investigate transferring mechanism of form error of bearing elements and rotational accuracy in cylindrical roller bearings, according to the bearing components motion and geometric relationships, a prediction model for rotational accuracy of cylindrical roller bearings based on roundness error of the inner raceway is presented. The effects of roundness error (i.e., amplitude, order) in the inner raceway, the number of rollers and radial clearance on the radial runout of inner ring are analyzed. Analytic solutions of the radial runout of inner ring are deduced when shapes of bearing elements are an ideal circle, which verifies the correctness of the presented model. The results show that the proposed model has better precision accuracy.

关键词： Cylindrical roller bearing Rotational accuracy Radial runout Roundness error Form error

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On the lift force modeling for single bubble in water 3

On the lift force modeling for single bubble in water

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Li, Zhongchun Song, Xiaoming Jiang, Shengyao Ishii, Mamoru Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China Nuclear Power Institute of China Chengdu610041 China Tsinghua University Beijing100084 China Department of Nuclear Engineering Purdue University 47906 United States

ISBN: (纸本)9780894487330

Lift force is one of the interfacial momentum transfer terms in the framework of two-fluid modeling. It is vital for accurate understanding of two phase flow system. The present study concluded the lift force modeling and correlations proposed using analytical, experimental and numerical approaches. The correlations were assessed with the existing experimental and numerical simulation results. The regions where insufficient data and contradictions between modeling and experimental data were presented were identified. A strategy for the lift force modeling was proposed based on the similarity between drag force and lift force. In addition, the effects of bubble size, fluid properties, contamination and shear flow rate were discussed. © 2016, American Nuclear Society. All rights reserved.

关键词： Shear flow

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Demo Abstract: Observability-driven sensor deployment in smart academic environments 14

Demo Abstract: Observability-driven sensor deployment in sma...

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14th ACM Conference on Embedded Networked Sensor systems, SenSys 2016

作者： Agarwal, A. Jaiswal, K. Gudhaka, U. Munigala, V. Ramamritham, Krithi Karmakar, Gopinath Department of Computer Science Engineering Indian Institute of Technology Bombay United States Reactor Control System Design Section Bhabha Atomic Research Centre India

ISBN: (纸本)9781450342636

Saving energy without causing discomfort and without de-manding human intervention is the need of the day. It is important to develop sensor systems which not only satisfy user requirements, but also take energy consumption into consideration. In this demo, we present the sensing subsys-tems of a Smart Academic Environment, based upon the core concept of Observability' [1] which-while satisfying user needs-helps to reduce the number of sensors required. © 2016 Copyright held by the owner/author(s).

关键词： Observability

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Forecast for Radial Runout of Outer Ring in Cylindrical Roller Bearing

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Procedia CIRP 2017年 62卷 375-379页

作者： Li Jishun Yu Yongjian Xue Yujun Henan Key Laboratory for Machinery Design and Transmission System Luoyang 471003 China School of Mechanical Engineering Henan University of Science and Technology Luoyang 471003 China School of Mechanical Engineering Northwestern Polytechnical University Xi’an 710072 China

The radial runout of outer ringin cylindrical roller bearing is investigated by numerical computation. Considering form error of outer raceway, a forecasting model for the radial runout of outer ring in cylindrical roller bearing is developed to study the influences of roundness error (i.e., amplitude, order) of outer raceway, number of rollers and radial clearance on the radial runout of outer ring. To testify the presented forecasting method, an analysis algorithm for computing the radial runout of outer ring with outer raceway shape of ellipse is derived. The comparison of the prediction results with the analytical results shows that the presented forecasting method has the better forecast precision.

关键词： Cylindrical roller bearing Radial runout of outer ring Roundness error Forecast

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RANS simulation of natural convection in an enclosure with curved surface heating from below 3

RANS simulation of natural convection in an enclosure with c...

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3rd International Topical Meeting on Advances in Thermal Hydraulics 2016, ATH 2016

作者： Chai, Xiang Chen, Bin Xu, Cheng School of Nuclear Science and Engineering Shanghai Jiao Tong University 800 Dongchuan RD. Minhang District Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Karlsruhe Institute of Technology Kaiserstr. 12 Karlsruhe76131 Germany

ISBN: (纸本)9780894487330

Prediction accuracy of natural convection is strongly dependent on the choice of turbulence model. In this paper, different turbulence models as well as turbulent heat flux models are employed to predict the natural convection in an enclosure with curved surface heating from below and investigate their performance. Based on the simulation results, it is found that k-Ε model which is well known to overestimate the production of kinetic energy provides a higher prediction of Nusselt number while k-Ε-ζ-f model provides a relatively smaller estimation. A systematic CFD simulation is carried out for Rayleigh numbers in the range 109 to 1011, with which the influence from aspect ratio is also investigated. The effect of Rayleigh number on heat transfer is found to be significant and the dependency of Nusselt number (Nu) is obtained as a function of Rayleigh number (Ra). The influence from the aspect ratio of the simulation domain is found to be dependent on the choice of turbulence model. For k-Ε model, Nu increases as aspect ratio increases, while an opposite dependency is observed when k-Ε-ζ-f model is used. For this discrepancy, arguments are provided based on the streamlines and the profiles of Nu over the heating surface. © 2016, American Nuclear Society. All rights reserved.

关键词： Natural convection

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