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| 1 | Analysis of sensitivity and errors in Maglev vibration test system显示文摘In order to improve work performance of M aglev vibration test systems,the relationships of operating parameters between different components and system were researched. The working principle of photoelectric displacement sensor was analyzed. The relationship between displacement of transducer and the infrared light area received by sensor was given. The method of expanding the dynamic range of vibrator was proposed,which makes dynamic range of Maglev vibrator doubled. By increasing the amplification of the amplifier,the sensitive photoelectric displacement sensor can be maintained. Two modes of operation of the controller were analyzed. Bilateral work of vibration test system designed can further improve the stability of the system.An object vibration was measured by Maglev vibration test system designed when different vibration exciter frequencies were loaded. Experiments showthat the output frequency measured by Maglev vibration test system and loaded are the same. Finally,the errors of test system were analyzed. These errors of vibration test system designed can meet the requirements of application. The results laid the foundation for the practical application of magnetic levitation vibration test system. | JIANG Dong LIU Xukun WANG Deyu YANG Jiaxiang | 2016 | Instrumentation2016，3，1： | 24 |
| 2 | Electrostatic levitation under the single-axis feedback control condition显示文摘An electrostatic levitator with a single-axis feedback control system was developed on the basis of electric field analysis and optimum design for levitation electrodes. In order to realize the stable levitation of various types of materials such as metals, inorganic materials and polymers, we made both experimental and theoretical investigations to solve the four key problems of electric field optimization, sample position detecting, sample charging control and levitation voltage minimization. Under the capacitive induction charging condition, a sample with the size of 2.6–4.5 mm usually bears positive charges amounting to 10-9 Coulomb. Because the single-axis feedback control system responds quickly, it takes the levitated sample only 0.1 s from leaving the bottom electrode until attaining a stable levitation in the upright direction. The levitated sample displays satisfactory levitation stability in both the upright and the horizontal directions owing to the constraining force produced by spherical electrodes. | HU Liang, WANG HaiPeng, XIE WenJun & WEI BingBo* Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，8： | 7 |
| 3 | Integration of a Nonlinear Vibration Absorber and Levitation Magnetoelectric Energy Harvester for Whole-Spacecraft Systems显示文摘This paper presents a new device integrating a nonlinear vibration absorber with a levitation magnetoelectric energy harvester for whole-spacecraft systems. This device effectively reduces vibration and has a stronger energy harvesting capability than the existing systems. It harvests energy from a wide frequency range and has a high output voltage. The harvested energy is determined by magnetic field strength, excitation frequency, and resistive load. The change in the magnetic field strength has the least impact on the output voltage. The vibration reduction effects and harvested energy of the system are analyzed with an approximate analytical method that combines the harmonic balance approach and the pseudo-arclength continuation algorithm. The results of the Runge-Kutta method are nearly consistent with those of the approximate analytical method. Moreover, the effects of the excitation frequency, resistive load, and parameters of the nonlinear energy sink on the system vibration response and energy harvesting are analyzed. | Ye-Wei Zhang Zhi-Wei Fang Shi-Lei Wang Zhi-Yu Ni Jian Zang Bo Fang | 2019 | Acta Mechanica Solida Sinica2019，32，3： | 6 |
| 4 | Digital image processing of sectorial oscillations for acoustically levitated drops and surface tension measurement显示文摘A type of non-axisymmetric oscillations of acoustically levitated drops is excited by modulating the ultrasound field at proper frequencies. These oscillations are recorded by a high speed camera and analyzed with a digital image processing method. They are demonstrated to be the third mode sectorial oscillations, and their frequencies are found to decrease with the increase of equatorial radius of the drops, which can be described by a modified Rayleigh equation. These oscillations decay exponentially after the cessation of ultrasound field modulation. The decaying rates agree reasonably with Lamb’s prediction. The rotating rate of the drops accompanying the shape oscillations is found to be less than 1.5 rounds per second. The surface tension of aqueous ethanol has been measured according to the modified Rayleigh equation. The results agree well with previous reports, which demonstrates the possible application of this kind of sectorial oscillations in noncontact measurement of liquid surface tension. | SHEN ChangLe, XIE WenJun & WEI BingBo Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，12： | 4 |
| 5 | NUMERICAL SIMULATION OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING(Ⅱ)显示文摘NUMERICALSIMULATIONOFALTERNATIVEHORIZONTALLEVITATIONELECTROMAGNETICCONTINUOUSCASTING(Ⅱ)￥ZhuShoujun;RenZhongming;DengKang;Jian... | Zhu Shoujun Ren Zhongming Deng Kang Jiang Guochang(Shanghai Enhanced Laboratory of Ferrometallurgy,Shanghai University,Shanghai 200072) | 1996 | 中国有色金属学会会刊:英文版1996，6，4： | 4 |
| 6 | THE ELECTROMAGNETIC FIELD CALCULATION AND ANALYSIS OF LEVITATION MELTING WITH COLD CRUCIBLE显示文摘In this paper, using the quasi-3D coupled current method, the influences of structure of cold crucible, the power frequency, the electricity property of melt, the coil position and current on the electromagnetic field (EMF) and the levitation characteristics in the melting processes are analyzed. It is shown that in the processes of levitation melting with cold crucible, the power frequency and cold crucible structure are the decisive factors for the ability of magnetic flux penetrating into cold crucible. The magnetic flux density in cold crucible is reduced as the increasing of power frequency, and this tendency becomes stronger when the power frequency is higher than 100kHz. The segmented structure of cold crucible can reduce the induction eddy in itself effectively, and the higher the power frequency is, the better the result is. So, a cold crucible can be segmented into 16-20 sectors for high frequency electromagnetic field and/or 8-12 sectors for lower frequency one. It is also shown that the levitation force of melting charge is related to coil current as a parabolic function. | K. Deng, Z.M. Ren, J.Q. Chen and G.C. Jiang School of Materials, Shanghai University, Shanghai 200072, China | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 3 |
| 7 | ELECTROMAGNETIC MODEL OF LEVITATION MELTING WITH COLD CRUCIBLE显示文摘ELECTROMAGNETICMODELOFLEVITATIONMELTINGWITHCOLDCRUCIBLEDengKang;ZhouYueming;RenZhongming;ZhuShoujun;WeiJihe;JiangGuochang(Sha... | Deng Kang Zhou Yueming Ren Zhongming Zhu Shoujun Wei Jihe Jiang Guochang(Shanghai Enhanced Laboratory of Ferrometallurgy,Shanghai University, Shanghai 200072) | 1996 | 中国有色金属学会会刊:英文版1996，6，2： | 3 |
| 8 | Ambiguous temperature difference in aerodynamic levitation process: Modelling, solving and application显示文摘The aerodynamic levitation provides an efficient technique for the research on thermophysical properties and solidification behavior of refractory materials. However, there is a nonnegligible temperature differences across sample, causing unexpected uncertainty of measurement, such as, thermal expansivity and undercooling limit. We establish thermal filed model with properly simplified boundary condition, and derive quantitative expressions of this ambiguous temperature difference. Here we show that the temperature difference not only related to the average temperature, relative size and thermal conductivity of sample, but significantly influenced by the rotation pattern of sample. A huge temperature differences is almost inevitable when the sample with low thermal conductivity and high melting point is smelted in stationary suspension pattern, however, a drastically reduction of temperature difference can be fulfilled by simply making the sample rotation in up to down pattern. The thermal filed simulation was used to confirm the validity of these theoretical expressions. This work shed light on temperature difference in aerodynamic levitation. Based on this work, one can simply estimate the extent of temperature difference across the sample, and regulated that conveniently if needed, which benefit for novel material preparation and solidification mechanism study based on this technique. | Xuan Ge Xiaowei Xu Qiaodan Hu Wenquan Lu Liang Yang Sheng Cao Mingxu Xia Jianguo Li | 2019 | Journal of Materials Science & Technology2019，35，8： | 1 |
| 9 | 铸态及退火La_(1.9)Ti_(0.1)MgNi_9合金的贮氢性能(英文)显示文摘采用磁悬浮感应熔炼及退火处理的方法,制备La1.9Ti0.1MgNi9合金。对合金样品的XRD、PCT和电化学测试表明,所有样品均由多相组成,LaNi5相为主相。当退火温度达到1173K时,合金中LaMg2Ni9相消失,Ti2Ni相出现。退火处理能提高合金的晶化程度、降低吸放氢平台压。退火1073K合金的有效吸氢量较高,在303K时达到1.25%(质量分数)。La1.9Ti0.1MgNi9合金退火后,放电容量、循环稳定性以及高倍率放电性能得到极大改善,以1173K退火合金电化学性能较好,其最大放电容量为377mAh/g,1100mA/g电流密度下的高倍率放电性能为0.839,经112次充放电循环后放电容量保持率为60%。 | 蒋卫卿 周正诚 黄春玉 蓝志强 郭进 | 2010 | 稀有金属材料与工程2010，39，11： | 1 |
| 10 | Fabrication and Maglev Properties of Large Bulk Melt-Texture-Growth YBCO Superconductor显示文摘FabricationandMaglevPropertiesofLargeBulkMelt-Texture-GrowthYBCOSuperconductorRenHongtao(任洪涛);XiaoLing(肖玲);JiaoYulei(焦玉磊);Wan... | 任洪涛 肖玲 焦玉磊 王永兰 | 1996 | Journal of Rare Earths1996，14，4： | 0 |
| 11 | Levitated Liquid Dynamics in Gravity Compensating Magnetic Fields显示文摘Numerical models are used to investigate behavior of a solid body or liquid droplets suspended in AC and DC magnetic fields of various configurations providing conditions similar to microgravity.The realistic gradient fields,as in superconducting magnets,are used for the modeling experiments with electrically conducting droplets.The oscillations in a high DC magnetic field are different for an electrically conducting droplet.At the high values of magnetic field some oscillation modes are damped quickly,while others are modified with a considerable shift of the oscillating droplet frequencies and the damping constants from the non-magnetic case.On a larger scale,the models are used to investigate the melting process of reactive materials,for example titanium alloys.If the contact is avoided,thermal losses could be limited only by radiation and possible evaporation. | V.Bojarevics K.Pericleous A.Roy | 2012 | Journal of Iron and Steel Research(International)2012，19，S2： | 0 |
| 12 | Single-axis ultrasound levitation system with annular clamping forces显示文摘Based on the principle of acoustic levitation,a single-axis ultrasonic levitation system(SAULS) with convex sides was designed.A normal SAULS only provides a levitation force(LF) against the gravity of the sample.While,such systems also provide an annular clamping force(ACF) surrounding the levitated samples,and improve levitation stability of samples in the standing wave field.Using the finite-difference time-domain method,we investigated the force distributions in different resonance cavities and the factors that influence the magnitude of the levitation force in optimizing the SAULS and the ACF.The theoretical analyses and experimental results indicate that the stability of levitation in this special SAULS is improved with the ACF from its designed convex-side feature.It can be developed into a simple device in levitating and moving samples steadily in related experiments and applications. | YIN Guanjun LI Pan FAN Haoran GUO Jianzhong | 2019 | Chinese Journal of Acoustics2019，38，2： | 0 |
| 13 | High Field Environment for EPM at the LNCMI显示文摘The Laboratoire National des Champs Magnetiques Intenses(LNCMI)is the CNRS French National High Magnetic Field Facility associated with three universities:Joseph Fourier in Grenoble,Paul Sabatier and INSA in Toulouse.It delivers to researchers direct current high magnetic field up to 35 teslas in 34 mm in Grenoble and pulsed field up to 80 T in Toulouse.Developments of new high field magnets and associated instrumentations are user oriented.These developments(highly homogeneous magnets,magnets for diffraction studies,high field gradient magnet...)are impulsed by different user cornmunities.Since a few years,magneto-science is attracting new users for the study of high field effects on physical,chemical and biological processes such as electrochemistry,metallurgy,nanostructuration,implying new methodologies and new experimental developments such as high temperature environment up to 1600 K.A survey of these developments is given.The laboratory is supported by the European Commission which contributes for the'Transnational Access'to the facility. | BEAUGNON Eric DEBRAY Francois | 2012 | Journal of Iron and Steel Research(International)2012，19，S2： | 0 |
| 14 | Effect of excess Y_2O_3 addition on the physical properties of melt processed YBCO bulks显示文摘The YBCO superconductors with Y2O3 addition were prepared by a modified melt textured process and the effects of excess Y2O3 addition on the physical properties of melt textured YBCO have been investigated. It is found that the melt temperature of YBCO samples decreases drastically with the increasing Y2O3, and the maximum levitation forces are drastically different for samples with different Y2O3 addition. It is also found that the optimal Y2O3 addition to YBCO is about 10wt%. Considering the microstructure and the starting composition, the results are well discussed and interpreted. | YANG Wanmin1,2,3, ZHOU Lian2, FENG Yong2, ZHANG Pingxiang2, WU Minzhi3 & W. GAWALEK3 1. Department of Physics, Shaanxi Normal University, Xi抋n 710062, China 2. Northwest Institute for Nonferrous Metal Research. Xi抋n 710016, China 3. Institute fur Physikalische Hochtechnologie e.V(IPHT), Jena, Germany Correspondence should be addressed to Yang Wanmin (email: wm-yang@sohu.com) Received June 27, 2003 | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，1： | 0 |
| 15 | Effect of induced shielding current transmission in longitudinal direction on levitation force of melt grown single-domain YBa_2Cu_3O_(7-x) cylindrical superconductor显示文摘A novel layer deletion method is used to experimentally investigate the effect of induced shielding current transmission (ISCT) in the longitudinal direction on the levitation force of a single-domain YBa2Cu3O7-x (YBCO) cylindrical superconductor (f30? mm). In the experiment the sample was gradually sliced into two equal sheets, at the middle height along a diameter with 5 mm every step. The experimental results show that the levitation force is closely related with the ISCT in the longitudinal direction. Any layer deletion, even a small piece of layer deletion can reduce the levitation force of the sample. After the whole layer was deleted the levitation force can diminish about 50%. It is also found that the levitation force is directly proportional to the effective factor of surface area, which is equal to the top surface area divided by the total surface area parallel to the top surface of the sample. | R. Nicolsky R. de Andrade Jr | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，2： | 0 |
| 16 | Large Gradient High Magnetic Field Affects Structure and Function of Bone Cells显示文摘With the development of superconducting technology, the superconducting magnet, which can produce a stable large gradient high magnetic field (LG-HMF) environment to | UAi-Rong Qian, Wei Zhang, Xiang Gao, Li-Fang Hu, Rui Meng and Peng Shang Institute of Special Environmental Biophysics, Key Laboratory for Space Biosciences &Biotechnology, Faculty of Life Sciences, Northwestern Polytechnical University Xi’an, 710072, China | 2009 | 生物物理学报2009，25，S1： | 0 |
| 17 | An improvement of frozen-image model and its application in a HTS levitation system显示文摘This paper mainly reports an improvement of frozen-image model which can qualitatively describe the influence of lateral moving speed on vertical force in a HTS levitation system under lateral movement with field-cooling condition.The model is improved by introducing a dipole which represents the influence of lateral moving speed and modifying the rule of diamagnetic dipole based on frozen-image model.The vertical and lateral forces that are obtained by this improved model agree with the previous measure... | Jun Zhou,Xingyi Zhang,and Youhe Zhou~(a)) Key Laboratory of Mechanics on Western Disaster and Environment(Ministry of Education of China), and Department of Mechanics and Engineering Science,College of Civil Engineering and Mechanics, Lanzhou University,Lanzhou 730000,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，3： | 0 |
| 18 | STUDY ON DYNAMIC CHARACTERISTICS OF ACOUSTIC LEVITATION显示文摘STUDYONDYNAMICCHARACTERISTICSOFACOUSTICLEVITATIONGaoJianrong(高建荣),CaoChongde(曹崇德),WeiBingbo(魏炳波)(LaboratoryofMaterialsScience... | 高建荣 曹崇德 魏炳波 | 1998 | Chinese Journal of Aeronautics1998，11，3： | 0 |
| 19 | Numerical Simulation of Fluid Flow Inside a Molten Liquid Metal Droplet Located in an Electromagnetic Induction Generated by Two Different Inducting Currents显示文摘Electromagnetic levitation of electrically conductive droplets by alternating magnetic fields is Sa technique used to measure the physical properties of liquid metallic alloys such as surface tension,viscosity,heat capacity.Experiments can be conducted in microgravity,to reduce electromagnetic stirring and shaping of the droplet.The inductor of the EML is composed of a single inductor which two types of voltage are imposed.This type of electrical installation generates a field to center the metallic droplet and another field to heat and excite it.We use a commercial code join to a homemade code to compute flows generated by inducting voltages recorded in the sounding rocket TEXUS-EML-2(Feb2008).In this flight,two samples(Cu75Co25 at%and A168,5Ni31,5 at%)of 8 mm diameter have been processed. | Alimata DIARRA Annie GAGNOUD Jacqueline ETAY Andreas STEIN Rainer WUNDERLICH | 2012 | Journal of Iron and Steel Research(International)2012，19，S1： | 0 |
| 20 | Maximization of Acoustic Levitating Force for a Single-Axis Acoustic Levitation System Using the Finite Element Method显示文摘We investigate single-axis acoustic levitation using standing waves to levitate particles freely in a medium bounded by a driver and a reflector. The acoustic pressure at the pressure antinode of the standing wave counteracts the downward gravitational force of the levitating object. The optimal relationship between the air gap and the driving frequency leads to resonance and hence maximization of the levitating force. Slight deviation from the exact resonance condition causes a reduction in acoustic pressure at the pressure antinodes. This results in a significant reduction of the levitating force. The driving frequency is kept constant while the air gap is varied for different conditions. The optimal air gap for maximizing the levitation force is studied for first three resonance modes. Furthermore, a levitating particle is introduced between the driver and the reflector. The dependence of the resonance condition on the size of the levitating particle as well as the position of the particle between the driver and the reflector has also been studied. As the size of the levitating particle increases, the resonance condition also gets modified. Finite element results show a good agreement with the validated results available in the literature. Furthermore, the finite element approach is also used to study the variation of acoustic pressure at the pressure antinode with respect to the size of the reflector. The optimum diameter of the reflector is calculated for maximizing the levitating force for three resonance modes. | Saurabh Yadav Arpan Gupta | 2019 | Chinese Physics Letters2019，36，3： | 0 |
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