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Near-field acoustic levitation and applications to bearings:a critical review

International Journal of Extreme manufacturing 2019年第3期1卷 13-32页

作者： Minghui Shi Kai Feng Junhui Hu Jiang Zhu Hailong Cui State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082People’s Republic of China State Key Lab of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China Department of Mechanical Engineering Tokyo Institute of TechnologyJapan Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang621000People’s Republic of China

The importance to industry of non-contact bearings is growing rapidly as the demand for highspeed and high-precision manufacturing equipment *** a recently developed non-contact technology,near-field acoustic levitation(NFAL)has drawn much attention for the advantages it offers,including no requirement for an external pressurized air supply,its compact structure,and its ability to adapt to its *** this paper,the working mechanism of NFAL is introduced in detail and compared to all existing non-contact technologies to demonstrate its versatility and potential for practical applications in *** fundamental theory of NFAL,including gas film lubrication theory and acoustic radiation pressure theory is ***,the current stateof-the-art of the design and development of squeeze film air bearings based on NFAL is ***,future trends and obstacles to more widespread use are discussed.

关键词： acoustic levitation non-contact technology bearing measuring and manufacturing equipment squeeze film

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Bills of Standard manufacturing Services (BOSS) Construction Based on focused Crawler

Bills of Standard Manufacturing Services (BOSS) Construction...

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IEEE International Conference on Smart manufacturing, Industrial & Logistics Engineering (SMILE)

作者： Jie Bai Shuiliang Fang Renzhong Tang Yifan Wu The State Key Laboratory of Fluid Power Transmission and Control College of Mechanical Engineering Zhejiang University Hangzhou China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou China

As an advanced manufacturing model, cloud manufacturing(CMfg) has made great progress in recent years. The concept of CMfg has been introduced to many industries. With the growing diversity of products, the complexity of cloud manufacturing service encapsulation is also increasing. To solve the problem of product-oriented service standardized encapsulation, the Bills of Standard manufacturing Service(BOSS) has been proposed. It can systematically solve the problem of deployment, registration and management of cloud manufacturing services in the whole product life cycle. In this paper, based on the service ontology model, we proposed an automatic perfecting service information method of BOSS using the focused crawler technology. Combined with the case study, we verified the feasibility and effectiveness of this method. Finally, the application framework of BOSS in the cloud manufacturing system is further discussed.

关键词： manufacturing Ontologies Crawlers Cloud computing Standards Data models Industries

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Create manufacturing Service with GAN

Create Manufacturing Service with GAN

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IEEE International Conference on Smart manufacturing, Industrial & Logistics Engineering (SMILE)

作者： Shengkai Chen Shuiliang Fang Renzhong Tang Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou China The State Key Laboratory of Fluid Power Transmission and Control College of Mechanical Engineering Zhejiang University Hangzhou China

A generative adversarial network based manufacturing service instance generator is proposed in this paper. During the training of the generative adversarial network model, we adopt Word2Vec model to represent manufacturing services in the form of numerical vectors. The accuracy of the generator gets 0.76 after training, and the synthesized data are good enough to extend the current datasets for the further study on manufacturing services.

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The Acquisition of Free Field Acoustic Characteristics of Targets in Water and Identification of Far-field Radiative Hot Zone

The Acquisition of Free Field Acoustic Characteristics of Ta...

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第二届船舶振动噪声国际研讨会

作者： LIN Wei LI Sheng LIU Chengpeng MENG Chunxia School of Naval Architecture ＆ Ocean Engineering Faculty of Vehicle Engineering and MechanicsDalian University of Technology Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration Key Laboratory for Underwater Measurement and Control Technology

At present, sound wave is the most effective information carrier for long distance underwater propagation. It’s achievable to acquire target free field characteristics in a non-free field environment by sound field recovery technique based on boundary element method（BEM） in this paper. According to the calculation, the characteristics such as the sound pressure and sound power obtained in the recovered field and those in the free field are almost the same. At the same time, evanescent wave filtering technique is used to filter out the influence of evanescent wave and identification of far-field sound radiation hotspot in near field, which provides the basis for reduction vibration and noise. In this paper, an improved sound field separation technique combing sound field recovery technique based on BEM and supersonic sound intensity technique is proposed to get the free field characteristic of the target in a complex environment and identify the hot spot area radiating to the far field in near field, which is of great significance to target characteristic analysis and control.

关键词： Boundary element method free field recovery technique evanescent wave far field radiation hotspot

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The effect of applied voltages on the structure,apatite-inducing ability and antibacterial ability of micro arc oxidation coating formed on titanium surface

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Bioactive Materials 2018年第4期3卷 426-433页

作者： Qing Du Daqing Wei Yaming Wang Su Cheng Shang Liu Yu Zhou Dechang Jia Institute for Advanced Ceramics Department of Materials Science and EngineeringHarbin Institute of TechnologyHarbin150001China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin150001China Center of Analysis and Measurement Harbin Institute of TechnologyHarbin150001China Department of Mechanical Engineering School of Architecture and Civil EngineeringHarbin University of Science and TechnologyHarbin150001China

The micro arc oxidation(MAO)coatings with different concentrations of Ca,P and Zn elements are successfully formed on the titanium substrate at the different applied *** MAO treatment,the MAO coating exhibits the porous surface structure and composed of anatase and rutile TiO2 ***,the average size and density of micro-pores on the MAO coatings have been modified via the adjusting the applied *** addition,the contents of the incorporated elements such as Zn,Ca and P elements in the MAO coatings have been *** bonding strength test results reveal that the MAO coating shows higher bonding strength,which is up to 45±5 *** to the pure Ti plate,the MAO coating formed at 350 and 400 V show good apatite-inducing ***,the MAO coating containing Zn,Ca and P elements have better antibacterial ability for *** and ***,the incorporation of Zn,Ca and P elements was an effective method to improve the antibacterial ***,the concentrations of Zn,Ca and P elements could be adjusted with the changing of the applied *** a result,the enhancement of the antibacterial ability on the MAO coating surfaces was depended on the comprehensive effect of the incorporated elements and the surface property of MAO coatings.

关键词： Micro arc oxidation Zn element Applied voltage Apatite-inducing ability Antibacterial ability

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Dynamic Response of a Cat Head Type Transmission Tower-line System under Strong Wind

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Journal of Physics: Conference Series 2021年第1期1986卷

作者： Chuan Wu Xiaohui Yang Bo Zhang Zehui Liu Yang Zhao State Grid Henan Electric Power Research Institute & State Grid Key Laboratory of Power Transmission Line Galloping Prevention and Control Technology Zhengzhou 450052 China School of Advanced Manufacturing Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China

Transmission tower plays important role in the power system and it is security sensitive in various working conditions, such as wind and ice. In this paper, a method to obtain the dynamic response of a cat head type transmission tower under strong fluctuating wind was proposed. The coupled tower-lines finite element model was established in ABAQUS, and the equivalent acceleration of fluctuating wind was simulated by MATLAB. Then the displacements and stresses time histories were obtained. The method introduced in this paper can be used to assess the safety of tower under different fluctuating wind with different directions and provide a reference of the tower in the design stage.

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Friction and Wear Properties of Al2O3/TiC/CaF2@Al2O3 Self-lubrication Ceramic Cutting Tool Materials

Friction and Wear Properties of Al2O3/TiC/CaF2@Al2O3 Self-lu...

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International Conference on Mechanical Design, ICMD 2017

作者： Chen, Zhaoqiang Guo, Runxin Xu, Chonghai Chen, Hui School of Mechanical and Automotive Engineering Qilu University of Technology Jinan250353 China Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong Qilu University of Technology Jinan250353 China School of Mechanical Engineering Shan Dong University Jinan250014 China

ISBN: (纸本)9789811065521

The Al2O3/TiC/CaF2@Al2O3 self-lubricating ceramic tool material was designed. The friction and wear properties of the material were studied. The results show that CaF2 as a core in Al2O3/TiC/CaF2@Al2O3 self-lubricating ceramic tool material can make the tool material have good lubricating ability;as the shell of Al2O3 will improve the wear resistance of the tool material. The friction coefficient of the material decreases with the increase of CaF2@Al2O3 content. The wear rate of the tool materials decrease at first, and then increase with the increase of CaF2@Al2O3 content. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Friction

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Multiferroic Heterostructures: Ultraflexible and Malleable Fe/BaTiO3Multiferroic Heterostructures for Functional Devices (Adv. Funct. Mater. 16/2021)

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advanced Functional Materials 2021年第16期31卷

作者： Yanan Zhao Renci Peng Yunting Guo Zhijie Liu Yongqi Dong Shishun Zhao Yaojin Li Guohua Dong Yue Hu Junwei Zhang Yong Peng Tiannan Yang Bian Tian Yifan Zhao Ziyao Zhou Zhuangde Jiang Zhenlin Luo Ming Liu Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research School of Electronics and Information Engineering State Key Laboratory for Mechanical Behavior of Materials International Joint Laboratory for Micro/Nano Manufacture and Measurement Technology Xi'an Jiaotong University Xi'an 710049 P. R. China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 P. R. China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education School of Physical Science and Technology and Electron Microscopy Centre Lanzhou University Lanzhou 730000 P. R. China Department of Materials Science and Engineering The Pennsylvania State University University Park PA 16802 USA State Key Laboratory for Manufacturing Systems Engineering Collaborative Innovation Center of High-End Manufacturing Equipment the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Jiaotong University Xi'an 710049 P. R. China

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Dual-comb based angle measurement method using a grating and a corner cube combined sensor

Dual-comb based angle measurement method using a grating and...

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Zhou, Siyu Zhu, Zebin Xiong, Shilin Ni, Kai Zhou, Qian Wu, Guanhao State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Division of Advanced Manufacturing Graduate School at Shenzhen Tsinghua University Shenzhen518055 China

We present an angle measurement method of dual-comb interferometry which uses a grating and a corner cube combined sensor. The precision is better than 10 arc-seconds within 3000 arc-seconds and 30 arc-seconds within ... 详细信息

ISBN: (纸本)9781943580453

关键词： Angle measurement

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Effect of CA mortar disengagement on Dynamic characteristics of Slab Ballastless Track on Subgrade 3

Effect of CA mortar disengagement on Dynamic characteristics...

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2018 3rd International Conference on Insulating Materials, Material Application and Electrical Engineering, IMMAEE 2018

作者： Shi, Hui Zhu, Liqiang Shi, Hongmei Yu, Zujun School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology Beijing Jiaotong University Ministry of Education Beijing100044 China

According to the improved model of the vehicle-ballastless slab track-subgrade coupling system, the effects of cement asphalt mortar (CA) disengagement on dynamic characteristics of vehicle and track are analysed. The results show that when the CA mortar longitudinal disengagement length exceeds 0.65m and the horizontal disengagement degree exceeds 0.5, the maximum and minimum of wheel-rail force, the maximum of the displacement of track system change obviously with the increase of CA mortar disengagement length. The effect of CA mortar disengagement on track system is larger than the vehicle system. The CA mortar disengagement should be repaired timely. © Published under licence by IOP Publishing Ltd.

关键词： Mortar

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